Studying heavy-flavour mesons and baryons in hadronic collisions provides unique insights into the properties of heavy-quark hadronisation amid large partonic densities, where novel mechanisms beyond in-vacuum fragmentation may emerge. Examining heavy-flavour production across different collision systems and event multiplicities provides information about multi-parton interactions and the development of a strongly-interacting medium in high-multiplicity pp and p-Pb collisions. In Pb-Pb collisions, measurements of the nuclear modification factor ($R_{rm AA}$) for charm and beauty hadrons provide a means to characterise the in-medium energy loss of heavy quarks in the quark-gluon plasma (QGP). In addition, measurements of the elliptic flow ($v_{2}$) for heavy quarks provide insights into their diffusion and their participation in the collective motion of the QGP. In this contribution, recent results of charm and beauty production measured with the ALICE detector are presented.
在强子对撞中研究重味介子和重子，可以深入了解大粒子密度中重夸克强子化的特性，在这里可能会出现真空中碎片之外的新机制。研究不同对撞系统和事件倍率下的重味产生提供了有关多粒子相互作用以及高倍率pp和pp-Pb对撞中强相互作用介质发展的信息。在Pb-Pb对撞中，对粲和美强子的核调制因子（$R_{rm AA}$）的测量为描述夸克-胶子等离子体（QGP）中重夸克的介质能量损失提供了一种方法。此外，对重夸克的椭圆流（$v_{2}$）的测量也有助于深入了解重夸克的扩散及其参与夸克-胶子等离子体集体运动的情况。本文将介绍利用 ALICE 探测器测量到的粲和美粒子产生的最新结果。
{"title":"Recent heavy-flavour measurements from ALICE","authors":"Jonghan Parkfor the ALICE Collaboration","doi":"arxiv-2407.13056","DOIUrl":"https://doi.org/arxiv-2407.13056","url":null,"abstract":"Studying heavy-flavour mesons and baryons in hadronic collisions provides\u0000unique insights into the properties of heavy-quark hadronisation amid large\u0000partonic densities, where novel mechanisms beyond in-vacuum fragmentation may\u0000emerge. Examining heavy-flavour production across different collision systems\u0000and event multiplicities provides information about multi-parton interactions\u0000and the development of a strongly-interacting medium in high-multiplicity pp\u0000and p-Pb collisions. In Pb-Pb collisions, measurements of the nuclear\u0000modification factor ($R_{rm AA}$) for charm and beauty hadrons provide a means\u0000to characterise the in-medium energy loss of heavy quarks in the quark-gluon\u0000plasma (QGP). In addition, measurements of the elliptic flow ($v_{2}$) for\u0000heavy quarks provide insights into their diffusion and their participation in\u0000the collective motion of the QGP. In this contribution, recent results of charm\u0000and beauty production measured with the ALICE detector are presented.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141737312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The production cross sections of $mathrm {D^0}$, $mathrm {D^+}$, and $mathrm {Lambda_{c}^{+}}$ hadrons originating from beauty-hadron decays (i.e. non-prompt) were measured for the first time at midrapidity in proton$-$lead (p$-$Pb) collisions at the center-of-mass energy per nucleon pair of $sqrt{s_{mathrm{NN}}} = 5.02$ TeV. Nuclear modification factors ($R_{mathrm {pPb}}$) of non-prompt $mathrm {D^0}$, $mathrm {D^+}$, and $mathrm {Lambda_{c}^{+}}$ are calculated as a function of the transverse momentum ($p_{mathrm T}$) to investigate the modification of the momentum spectra measured in p$-$Pb collisions with respect to those measured in proton$-$proton (pp) collisions at the same energy. The $R_{mathrm {pPb}}$ measurements are compatible with unity and with the measurements in the prompt charm sector, and do not show a significant $p_{mathrm T}$ dependence. The $p_{mathrm T}$-integrated cross sections and $p_{mathrm T}$-integrated $R_{mathrm {pPb}}$ of non-prompt $mathrm {D^0}$ and $mathrm {D^+}$ mesons are also computed by extrapolating the visible cross sections down to $p_{mathrm T}$ = 0. The non-prompt D-meson $R_{mathrm {pPb}}$ integrated over $p_{mathrm T}$ is compatible with unity and with model calculations implementing modification of the parton distribution functions of nucleons bound in nuclei with respect to free nucleons. The non-prompt $mathrm {Lambda_{c}^{+}/D^{0}}$ and $mathrm{D^+/D^0}$ production ratios are computed to investigate hadronisation mechanisms of beauty quarks into mesons and baryons. The measured ratios as a function of $p_{mathrm T}$ display a similar trend to that measured for charm hadrons in the same collision system.
{"title":"Measurement of beauty production via non-prompt charm hadrons in p-Pb collisions at $sqrt{s_{mathrm{NN}}} = 5.02$ TeV","authors":"ALICE Collaboration","doi":"arxiv-2407.10593","DOIUrl":"https://doi.org/arxiv-2407.10593","url":null,"abstract":"The production cross sections of $mathrm {D^0}$, $mathrm {D^+}$, and\u0000$mathrm {Lambda_{c}^{+}}$ hadrons originating from beauty-hadron decays (i.e.\u0000non-prompt) were measured for the first time at midrapidity in proton$-$lead\u0000(p$-$Pb) collisions at the center-of-mass energy per nucleon pair of\u0000$sqrt{s_{mathrm{NN}}} = 5.02$ TeV. Nuclear modification factors ($R_{mathrm\u0000{pPb}}$) of non-prompt $mathrm {D^0}$, $mathrm {D^+}$, and $mathrm\u0000{Lambda_{c}^{+}}$ are calculated as a function of the transverse momentum\u0000($p_{mathrm T}$) to investigate the modification of the momentum spectra\u0000measured in p$-$Pb collisions with respect to those measured in proton$-$proton\u0000(pp) collisions at the same energy. The $R_{mathrm {pPb}}$ measurements are\u0000compatible with unity and with the measurements in the prompt charm sector, and\u0000do not show a significant $p_{mathrm T}$ dependence. The $p_{mathrm\u0000T}$-integrated cross sections and $p_{mathrm T}$-integrated $R_{mathrm\u0000{pPb}}$ of non-prompt $mathrm {D^0}$ and $mathrm {D^+}$ mesons are also\u0000computed by extrapolating the visible cross sections down to $p_{mathrm T}$ =\u00000. The non-prompt D-meson $R_{mathrm {pPb}}$ integrated over $p_{mathrm T}$\u0000is compatible with unity and with model calculations implementing modification\u0000of the parton distribution functions of nucleons bound in nuclei with respect\u0000to free nucleons. The non-prompt $mathrm {Lambda_{c}^{+}/D^{0}}$ and\u0000$mathrm{D^+/D^0}$ production ratios are computed to investigate hadronisation\u0000mechanisms of beauty quarks into mesons and baryons. The measured ratios as a\u0000function of $p_{mathrm T}$ display a similar trend to that measured for charm\u0000hadrons in the same collision system.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141719912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The PandaX-4T liquid xenon detector at the China Jinping Underground Laboratory is used to measure the solar $^8$B neutrino flux by detecting neutrinos through coherent scattering with xenon nuclei. Data samples requiring the coincidence of scintillation and ionization signals (paired), as well as unpaired ionization-only signals (US2), are selected with energy threshold of approximately 1.1 keV (0.33 keV) nuclear recoil energy. Combining the commissioning run and the first science run of PandaX-4T, a total exposure of 1.25 and 1.04 tonne$cdot$year are collected for the paired and US2, respectively. After unblinding, 3 and 332 events are observed with an expectation of 2.8$pm$0.5 and 251$pm$32 background events, for the paired and US2 data, respectively. A combined analysis yields a best-fit $^8$B neutrino signal of 3.5 (75) events from the paired (US2) data sample, with $sim$37% uncertainty, and the background-only hypothesis is disfavored at 2.64$sigma$ significance. This gives a solar $^8$B neutrino flux of ($8.4pm3.1$)$times$10$^6$ cm$^{-2}$s$^{-1}$, consistent with the standard solar model prediction. This is the first indication of solar $^8$B neutrino ``fog'' in a dark matter direct detection experiment.
{"title":"First Measurement of Solar $^8$B Neutrino Flux through Coherent Elastic Neutrino-Nucleus Scattering in PandaX-4T","authors":"PandaX Collaboration, Zihao Bo, Wei Chen, Xun Chen, Yunhua Chen, Zhaokan Cheng, Xiangyi Cui, Yingjie Fan, Deqing Fang, Zhixing Gao, Lisheng Geng, Karl Giboni, Xunan Guo, Xuyuan Guo, Zichao Guo, Chencheng Han, Ke Han, Changda He, Jinrong He, Di Huang, Houqi Huang, Junting Huang, Ruquan Hou, Yu Hou, Xiangdong Ji, Xiangpan Ji, Yonglin Ju, Chenxiang Li, Jiafu Li, Mingchuan Li, Shuaijie Li, Tao Li, Zhiyuan Li, Qing Lin, Jianglai Liu, Congcong Lu, Xiaoying Lu, Lingyin Luo, Yunyang Luo, Wenbo Ma, Yugang Ma, Yajun Mao, Yue Meng, Xuyang Ning, Binyu Pang, Ningchun Qi, Zhicheng Qian, Xiangxiang Ren, Dong Shan, Xiaofeng Shang, Xiyuan Shao, Guofang Shen, Manbin Shen, Wenliang Sun, Yi Tao, Anqing Wang, Guanbo Wang, Hao Wang, Jiamin Wang, Lei Wang, Meng Wang, Qiuhong Wang, Shaobo Wang, Siguang Wang, Wei Wang, Xiuli Wang, Xu Wang, Zhou Wang, Yuehuan Wei, Weihao Wu, Yuan Wu, Mengjiao Xiao, Xiang Xiao, Kaizhi Xiong, Yifan Xu, Shunyu Yao, Binbin Yan, Xiyu Yan, Yong Yang, Peihua Ye, Chunxu Yu, Ying Yuan, Zhe Yuan, Youhui Yun, Xinning Zeng, Minzhen Zhang, Peng Zhang, Shibo Zhang, Shu Zhang, Tao Zhang, Wei Zhang, Yang Zhang, Yingxin Zhang, Yuanyuan Zhang, Li Zhao, Jifang Zhou, Jiaxu Zhou, Jiayi Zhou, Ning Zhou, Xiaopeng Zhou, Yubo Zhou, Zhizhen Zhou","doi":"arxiv-2407.10892","DOIUrl":"https://doi.org/arxiv-2407.10892","url":null,"abstract":"The PandaX-4T liquid xenon detector at the China Jinping Underground\u0000Laboratory is used to measure the solar $^8$B neutrino flux by detecting\u0000neutrinos through coherent scattering with xenon nuclei. Data samples requiring\u0000the coincidence of scintillation and ionization signals (paired), as well as\u0000unpaired ionization-only signals (US2), are selected with energy threshold of\u0000approximately 1.1 keV (0.33 keV) nuclear recoil energy. Combining the\u0000commissioning run and the first science run of PandaX-4T, a total exposure of\u00001.25 and 1.04 tonne$cdot$year are collected for the paired and US2,\u0000respectively. After unblinding, 3 and 332 events are observed with an\u0000expectation of 2.8$pm$0.5 and 251$pm$32 background events, for the paired and\u0000US2 data, respectively. A combined analysis yields a best-fit $^8$B neutrino\u0000signal of 3.5 (75) events from the paired (US2) data sample, with $sim$37%\u0000uncertainty, and the background-only hypothesis is disfavored at 2.64$sigma$\u0000significance. This gives a solar $^8$B neutrino flux of\u0000($8.4pm3.1$)$times$10$^6$ cm$^{-2}$s$^{-1}$, consistent with the standard\u0000solar model prediction. This is the first indication of solar $^8$B neutrino\u0000``fog'' in a dark matter direct detection experiment.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141719914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The production yields of antideuterons and antiprotons are measured in pp collisions at a center-of-mass energy of $sqrt{s}=13$ TeV, as a function of transverse momentum ($p_{rm T}$) and rapidity ($y$), for the first time up to $|y|= 0.7$. The measured spectra are used to study the $p_{rm T}$ and rapidity dependence of the coalescence parameter $B_2$, which quantifies the coalescence probability of antideuterons. The $p_{rm T}$ and rapidity dependence of the obtained $B_2$ is extrapolated for $p_{rm T}> 1.7$ GeV/$c$ and $|y|>0.7$ using the phenomenological antideuteron production model implemented in PYTHIA 8.3 as well as a baryon coalescence afterburner model based on EPOS 3. Such measurements are of interest to the astrophysics community, since they can be used for the calculation of the flux of antinuclei from cosmic rays, in combination with coalescence models.
{"title":"Rapidity dependence of antideuteron coalescence in pp collisions at $sqrt{s}$ = 13 TeV with ALICE","authors":"ALICE Collaboration","doi":"arxiv-2407.10527","DOIUrl":"https://doi.org/arxiv-2407.10527","url":null,"abstract":"The production yields of antideuterons and antiprotons are measured in pp\u0000collisions at a center-of-mass energy of $sqrt{s}=13$ TeV, as a function of\u0000transverse momentum ($p_{rm T}$) and rapidity ($y$), for the first time up to\u0000$|y|= 0.7$. The measured spectra are used to study the $p_{rm T}$ and rapidity\u0000dependence of the coalescence parameter $B_2$, which quantifies the coalescence\u0000probability of antideuterons. The $p_{rm T}$ and rapidity dependence of the\u0000obtained $B_2$ is extrapolated for $p_{rm T}> 1.7$ GeV/$c$ and $|y|>0.7$ using\u0000the phenomenological antideuteron production model implemented in PYTHIA 8.3 as\u0000well as a baryon coalescence afterburner model based on EPOS 3. Such\u0000measurements are of interest to the astrophysics community, since they can be\u0000used for the calculation of the flux of antinuclei from cosmic rays, in\u0000combination with coalescence models.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141722299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Sokołowska, V. Guadilla, C. Mazzocchi, R. Ahmed, M. Borge, G. Cardella, A. A. Ciemny, L. G. Cosentino, E. De Filippo, V. Fedosseev, A. Fijałkowska, L. M. Fraile, E. Geraci, A. Giska, B. Gnoffo, C. Granados, Z. Janas, Ł. Janiak, K. Johnston, G. Kamiński, A. Korgul, A. Kubiela, C. Maiolino, B. Marsh, N. S. Martorana, K. Miernik, P. Molkanov, J. D. Ovejas, E. V. Pagano, S. Pirrone, M. Pomorski, A. M. Quynh, K. Riisager, A. Russo, P. Russotto, A. Świercz, S. Viñals, S. Wilkins, M. Pfützner
The $beta$ decay of one-neutron halo nucleus $^{11}$Be was investigated using the Warsaw Optical Time Projection Chamber (OTPC) detector to measure $beta$-delayed charged particles. The results of two experiments are reported. In the first one, carried out in LNS Catania, the absolute branching ratio for $beta$-delayed $alpha$ emission was measured by counting incoming $^{11}$Be ions stopped in the detector and the observed decays with the emission of $alpha$ particle. The result of 3.27(46)% is in good agreement with the literature value. In the second experiment, performed at the HIE-ISOLDE facility at CERN, bunches containing several hundreds of $^{11}$Be ions were implanted into the OTPC detector followed by the detection of decays with the emission of charged particles. The energy spectrum of $beta$-delayed $alpha$ particles was determined in the full energy range. It was analysed in the R-matrix framework and was found to be consistent with the literature. The best description of the spectrum was obtained assuming that the two $3/2^+$ and one $1/2^+$ states in $^{11}$B are involved in the transition. The search for $beta$-delayed emission of protons was undertaken. Only the upper limit for the branching ratio for this process of $(2.2 pm 0.6_{rm stat} pm 0.6_{rm sys}) times 10^{-6}$ could be determined. This value is in conflict with the result published in [Ayyad et al. Phys. Rev. Lett. 123, 082501 (2019)] but does agree with the limit reported in [Riisager et al., Eur. Phys. J. A (2020) 56:100]
利用华沙光学时间投影室（OTPC）探测器对一中子晕核$^{11}$Be的$beta$衰变进行了研究，以测量延迟的带电粒子。第一项实验是在卡塔尼亚 LNS 进行的，通过对停止在探测器中的入射 $^{11}$Be 离子和观测到的与发射 $α$ 粒子的衰变进行计数，测量了 $β$ 延迟 $α$ 发射的绝对分支比。结果为3.27(46)%，与文献值非常吻合。第二次实验是在欧洲核子研究中心的HIE-ISOLDE设施进行的，将含有数百个$^{11}$Be离子的离子束植入OTPC探测器，然后探测带电粒子发射的衰变。在整个能量范围内测定了 $beta$ -延迟的 $alpha$ 粒子的能谱。在R-矩阵框架内对其进行了分析，发现与文献一致。假设 $^{11}$B 中的两个 $3/2^+$ 态和一个 $1/2^+$ 态参与了这一转变，就得到了对光谱的最佳描述。对质子的延迟发射进行了搜索。只能确定这一过程的分支率上限为 $(2.2 pm 0.6_{rm stat} pm 0.6_{rmsys}) times 10^{-6}$。这个数值与[Ayyad et al. Phys. Rev. Lett. 123, 082501 (2019)]中发表的结果相冲突，但与[Riisager et al., Eur.
{"title":"Decay study of $^{11}$Be with an Optical TPC detector","authors":"N. Sokołowska, V. Guadilla, C. Mazzocchi, R. Ahmed, M. Borge, G. Cardella, A. A. Ciemny, L. G. Cosentino, E. De Filippo, V. Fedosseev, A. Fijałkowska, L. M. Fraile, E. Geraci, A. Giska, B. Gnoffo, C. Granados, Z. Janas, Ł. Janiak, K. Johnston, G. Kamiński, A. Korgul, A. Kubiela, C. Maiolino, B. Marsh, N. S. Martorana, K. Miernik, P. Molkanov, J. D. Ovejas, E. V. Pagano, S. Pirrone, M. Pomorski, A. M. Quynh, K. Riisager, A. Russo, P. Russotto, A. Świercz, S. Viñals, S. Wilkins, M. Pfützner","doi":"arxiv-2407.09846","DOIUrl":"https://doi.org/arxiv-2407.09846","url":null,"abstract":"The $beta$ decay of one-neutron halo nucleus $^{11}$Be was investigated\u0000using the Warsaw Optical Time Projection Chamber (OTPC) detector to measure\u0000$beta$-delayed charged particles. The results of two experiments are reported.\u0000In the first one, carried out in LNS Catania, the absolute branching ratio for\u0000$beta$-delayed $alpha$ emission was measured by counting incoming $^{11}$Be\u0000ions stopped in the detector and the observed decays with the emission of\u0000$alpha$ particle. The result of 3.27(46)% is in good agreement with the\u0000literature value. In the second experiment, performed at the HIE-ISOLDE\u0000facility at CERN, bunches containing several hundreds of $^{11}$Be ions were\u0000implanted into the OTPC detector followed by the detection of decays with the\u0000emission of charged particles. The energy spectrum of $beta$-delayed $alpha$\u0000particles was determined in the full energy range. It was analysed in the\u0000R-matrix framework and was found to be consistent with the literature. The best\u0000description of the spectrum was obtained assuming that the two $3/2^+$ and one\u0000$1/2^+$ states in $^{11}$B are involved in the transition. The search for\u0000$beta$-delayed emission of protons was undertaken. Only the upper limit for\u0000the branching ratio for this process of $(2.2 pm 0.6_{rm stat} pm 0.6_{rm\u0000sys}) times 10^{-6}$ could be determined. This value is in conflict with the\u0000result published in [Ayyad et al. Phys. Rev. Lett. 123, 082501 (2019)] but does\u0000agree with the limit reported in [Riisager et al., Eur. Phys. J. A (2020)\u000056:100]","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141719913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. F. Xu, Y. K. Wang, Y. P. Wang, P. Ring, P. W. Zhao
The rotational properties of the transfermium nuclei are investigated in the full deformation space by implementing a shell-model-like approach in the cranking covariant density functional theory on a three-dimensional lattice, where the pairing correlations, deformations, and moments of inertia are treated in a microscopic and self-consistent way. The kinematic and dynamic moments of inertia of the rotational bands observed in the transfermium nuclei $^{252}$No, $^{254}$No, $^{254}$Rf, and $^{256}$Rf are well reproduced without any adjustable parameters using a well-determined universal density functional. It is found for the first time that the emergence of the octupole deformation should be responsible for the significantly different rotational behavior observed in $^{252}$No and $^{254}$No. The present results provide a microscopic solution to the long-standing puzzle on the rotational behavior in No isotopes, and highlight the risk of investigating only the hexacontetrapole ($beta_{60}$) deformation effects in rotating transfermium nuclei without considering the octupole deformation.
{"title":"Emergence of High-Order Deformation in Rotating Transfermium Nuclei: A Microscopic Understanding","authors":"F. F. Xu, Y. K. Wang, Y. P. Wang, P. Ring, P. W. Zhao","doi":"arxiv-2407.08996","DOIUrl":"https://doi.org/arxiv-2407.08996","url":null,"abstract":"The rotational properties of the transfermium nuclei are investigated in the\u0000full deformation space by implementing a shell-model-like approach in the\u0000cranking covariant density functional theory on a three-dimensional lattice,\u0000where the pairing correlations, deformations, and moments of inertia are\u0000treated in a microscopic and self-consistent way. The kinematic and dynamic\u0000moments of inertia of the rotational bands observed in the transfermium nuclei\u0000$^{252}$No, $^{254}$No, $^{254}$Rf, and $^{256}$Rf are well reproduced without\u0000any adjustable parameters using a well-determined universal density functional.\u0000It is found for the first time that the emergence of the octupole deformation\u0000should be responsible for the significantly different rotational behavior\u0000observed in $^{252}$No and $^{254}$No. The present results provide a\u0000microscopic solution to the long-standing puzzle on the rotational behavior in\u0000No isotopes, and highlight the risk of investigating only the hexacontetrapole\u0000($beta_{60}$) deformation effects in rotating transfermium nuclei without\u0000considering the octupole deformation.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141719915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. S. Timchenko O. S. Deiev, S. M. Olejnik, S. M. Potin, V. A. Kushnir, V. V. Mytrochenko, S. A. Perezhogin, A. Herzáň
Production of the ${^{55-57}}$Co nuclei on ${^{rm nat}}$Ni in photonuclear reactions using bremsstrahlung gamma photon irradiation with end-point energy $E_{rm{gamma max}}$ between 35 and 94~MeV has been studied. The experiment was performed at the electron linear accelerator LUE-40 NSC KIPT using the methods of $gamma$ activation and off-line $gamma$-ray spectroscopy. The obtained experimental flux-averaged cross-sections $langle{sigma(E_{rm{gamma max}})}rangle$ agree with the data found in literature. The theoretical flux-averaged cross-sections $langle{sigma(E_{rm{gamma max}})}rangle_{rm{th}}$ for the production of ${^{55-57}}$Co and ${^{55-57}}$Ni were estimated using the cross-section values $sigma(E)$ from the TALYS1.95 code and bremsstrahlung spectra of gamma photons calculated by GEANT4.9.2. The experimental results for ${^{56,57}}$Co agree with the cumulative $langle{sigma(E_{rm{gamma max}})}rangle_{rm{th}}$. However theoretical prediction fails to reproduce the measured cross-sections for the production of ${^{55}}$Co.
{"title":"Photoproduction of the ${^{55-57}}$Co nuclei on ${^{rm nat}}$Ni at the bremsstrahlung end-point energy of 35-94 MeV","authors":"I. S. Timchenko O. S. Deiev, S. M. Olejnik, S. M. Potin, V. A. Kushnir, V. V. Mytrochenko, S. A. Perezhogin, A. Herzáň","doi":"arxiv-2407.09245","DOIUrl":"https://doi.org/arxiv-2407.09245","url":null,"abstract":"Production of the ${^{55-57}}$Co nuclei on ${^{rm nat}}$Ni in photonuclear\u0000reactions using bremsstrahlung gamma photon irradiation with end-point energy\u0000$E_{rm{gamma max}}$ between 35 and 94~MeV has been studied. The experiment\u0000was performed at the electron linear accelerator LUE-40 NSC KIPT using the\u0000methods of $gamma$ activation and off-line $gamma$-ray spectroscopy. The\u0000obtained experimental flux-averaged cross-sections\u0000$langle{sigma(E_{rm{gamma max}})}rangle$ agree with the data found in\u0000literature. The theoretical flux-averaged cross-sections\u0000$langle{sigma(E_{rm{gamma max}})}rangle_{rm{th}}$ for the production of\u0000${^{55-57}}$Co and ${^{55-57}}$Ni were estimated using the cross-section values\u0000$sigma(E)$ from the TALYS1.95 code and bremsstrahlung spectra of gamma photons\u0000calculated by GEANT4.9.2. The experimental results for ${^{56,57}}$Co agree\u0000with the cumulative $langle{sigma(E_{rm{gamma max}})}rangle_{rm{th}}$.\u0000However theoretical prediction fails to reproduce the measured cross-sections\u0000for the production of ${^{55}}$Co.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141722301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. S. Timchenko, O. S. Deiev, S. M. Olejnik, S. M. Potin, V. A. Kushnir, V. V. Mytrochenko, S. A. Perezhogin
The photoproduction of the $^{rm 93m}$Mo nucleus on natural molybdenum was studied using the electron beam of the LUE-40 linac RDC "Accelerator" NSC KIPT. Measurements were performed using the activation method and off-line $gamma$-ray spectrometric technique. For the $^{rm nat}$Mo($gamma,x$n)$^{rm 93m}$Mo reaction the experimental flux-averaged cross-section <$sigma(E_{rm gamma max})$>$_rm m$ at the bremsstrahlung end-point energy range of 38--93 MeV was first time determined. The theoretical values of the yields $Y_{rm m,g}(E_{rm gamma max})$ and flux-averaged cross-sections <$sigma(E_{rm gamma max})$>$_{rm m,g}$ for the $^{rm nat}$Mo($gamma,x$n)$^{rm 93m,g}$Mo reactions were calculated using the cross-sections $sigma(E_{rm gamma})$ from the TALYS1.96 code for different gamma strength functions and level density models. The comparison showed strong discrepancies between the experimental values and the theoretical results of <$sigma(E_{rm gamma max})$>$_m$.
{"title":"Cross-sections of photoneutron reaction $^{rm nat}$Mo($γ,x$n)$^{rm 93m}$Mo at the bremsstrahlung energy up to 95 MeV","authors":"I. S. Timchenko, O. S. Deiev, S. M. Olejnik, S. M. Potin, V. A. Kushnir, V. V. Mytrochenko, S. A. Perezhogin","doi":"arxiv-2407.09085","DOIUrl":"https://doi.org/arxiv-2407.09085","url":null,"abstract":"The photoproduction of the $^{rm 93m}$Mo nucleus on natural molybdenum was\u0000studied using the electron beam of the LUE-40 linac RDC \"Accelerator\" NSC KIPT.\u0000Measurements were performed using the activation method and off-line\u0000$gamma$-ray spectrometric technique. For the $^{rm nat}$Mo($gamma,x$n)$^{rm\u000093m}$Mo reaction the experimental flux-averaged cross-section <$sigma(E_{rm\u0000gamma max})$>$_rm m$ at the bremsstrahlung end-point energy range of 38--93\u0000MeV was first time determined. The theoretical values of the yields $Y_{rm\u0000m,g}(E_{rm gamma max})$ and flux-averaged cross-sections <$sigma(E_{rm\u0000gamma max})$>$_{rm m,g}$ for the $^{rm nat}$Mo($gamma,x$n)$^{rm 93m,g}$Mo\u0000reactions were calculated using the cross-sections $sigma(E_{rm gamma})$\u0000from the TALYS1.96 code for different gamma strength functions and level\u0000density models. The comparison showed strong discrepancies between the\u0000experimental values and the theoretical results of <$sigma(E_{rm gamma\u0000max})$>$_m$.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141719850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Photonuclear reactions are induced by the strong electromagnetic field generated by ultrarelativistic heavy ions. These processes have been extensively studied in ultraperipheral collisions. In recent years, the observation of coherent J/$psi$ photoproduction has been claimed in nucleus-nucleus (A-A) collisions with nuclear overlap, based on the measurement of an excess in the very low transverse momentum ($p_{rm T}$) J/$psi$ yield. Such quarkonium measurements can help constraining the nuclear gluon distribution at low Bjorken-$x$ and can shed light on the theory behind photon induced reactions in A-A collisions with nuclear overlap. In order to confirm the photoproduction origin of the very low-$p_{rm T}$ J/$psi$ yield excess, polarization measurement is a golden observable. It is indeed expected that the produced quarkonium would keep the polarization of the incoming photon due to $s$-channel helicity conservation. ALICE can measure inclusive and exclusive quarkonium production down to zero transverse momentum, at forward rapidity (2.5 $< y <$ 4) and midrapidity ($|y| <$ 0.9). In this contribution, we will report on the new preliminary measurement of the $y$-differential cross section and the first polarization analysis at LHC of coherently photoproduced J/$psi$ in peripheral Pb-Pb collisions. Both measurements are conducted at forward rapidity in the dimuon decay channel.
光核反应是由超相对论重离子产生的强电磁场诱发的。人们在超外围碰撞中对这些过程进行了广泛的研究。近年来，人们声称在核重叠的核-核（A-A）对撞中观测到了相干的J/$psi$光生成，其依据是对极低横动量（$p_{rm T}$）J/$psi$产率过剩的测量。这种夸克鎓测量有助于约束低Bjorken-$x$时的核胶分布，并能揭示核重叠A-A对撞中光子诱导反应背后的理论。为了证实极低$p_{rm T}$J/$psi$产率过剩的光生源，偏振测量是一个黄金观测指标。事实上，由于s通道的螺旋守恒，人们预计产生的夸克鎓将保持传入光子的偏振。ALICE可以在前向快速（2.5 $< y <$ 4）和中向快速（$|y| <$ 0.9）测量低至零横向动量的包容性和排他性夸克鎓的产生。在这篇论文中，我们将报告在LHC上对外围Pb-Pb碰撞中相干光生J/$psi$的$y$-差分截面的新的初步测量和首次极化分析。这两项测量都是在二微子衰变通道中以正向拉伸率进行的。
{"title":"Coherent J/$ψ$ photoproduction and polarization in peripheral Pb-Pb collisions with ALICE","authors":"L. Massacrierfor the ALICE Collaboration","doi":"arxiv-2407.09707","DOIUrl":"https://doi.org/arxiv-2407.09707","url":null,"abstract":"Photonuclear reactions are induced by the strong electromagnetic field\u0000generated by ultrarelativistic heavy ions. These processes have been\u0000extensively studied in ultraperipheral collisions. In recent years, the\u0000observation of coherent J/$psi$ photoproduction has been claimed in\u0000nucleus-nucleus (A-A) collisions with nuclear overlap, based on the measurement\u0000of an excess in the very low transverse momentum ($p_{rm T}$) J/$psi$ yield.\u0000Such quarkonium measurements can help constraining the nuclear gluon\u0000distribution at low Bjorken-$x$ and can shed light on the theory behind photon\u0000induced reactions in A-A collisions with nuclear overlap. In order to confirm\u0000the photoproduction origin of the very low-$p_{rm T}$ J/$psi$ yield excess,\u0000polarization measurement is a golden observable. It is indeed expected that the\u0000produced quarkonium would keep the polarization of the incoming photon due to\u0000$s$-channel helicity conservation. ALICE can measure inclusive and exclusive\u0000quarkonium production down to zero transverse momentum, at forward rapidity\u0000(2.5 $< y <$ 4) and midrapidity ($|y| <$ 0.9). In this contribution, we will\u0000report on the new preliminary measurement of the $y$-differential cross section\u0000and the first polarization analysis at LHC of coherently photoproduced J/$psi$\u0000in peripheral Pb-Pb collisions. Both measurements are conducted at forward\u0000rapidity in the dimuon decay channel.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141722300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
PHENIX Collaboration, N. J. Abdulameer, U. Acharya, A. Adare, C. Aidala, N. N. Ajitanand, Y. Akiba, R. Akimoto, H. Al-Ta'ani, J. Alexander, A. Angerami, K. Aoki, N. Apadula, Y. Aramaki, H. Asano, E. C. Aschenauer, E. T. Atomssa, T. C. Awes, B. Azmoun, V. Babintsev, M. Bai, B. Bannier, K. N. Barish, B. Bassalleck, S. Bathe, V. Baublis, S. Baumgart, A. Bazilevsky, R. Belmont, R. Belmont, A. Berdnikov, Y. Berdnikov, L. Bichon, B. Blankenship, D. S. Blau, J. S. Bok, V. Borisov, K. Boyle, M. L. Brooks, H. Buesching, V. Bumazhnov, S. Butsyk, S. Campbell, P. Castera, C. -H. Chen, D. Chen, M. Chiu, C. Y. Chi, I. J. Choi, J. B. Choi, S. Choi, R. K. Choudhury, P. Christiansen, T. Chujo, O. Chvala, V. Cianciolo, Z. Citron, B. A. Cole, M. Connors, M. Connors, R. Corliss, M. Csanád, T. Csörgő, L. D'Orazio, S. Dairaku, A. Datta, M. S. Daugherity, G. David, A. Denisov, A. Deshpande, E. J. Desmond, K. V. Dharmawardane, O. Dietzsch, L. Ding, A. Dion, M. Donadelli, V. Doomra, O. Drapier, A. Drees, K. A. Drees, J. M. Durham, A. Durum, S. Edwards, Y. V. Efremenko, T. Engelmore, A. Enokizono, R. Esha, K. O. Eyser, B. Fadem, D. E. Fields, M. Finger, Jr., M. Finger, D. Firak, D. Fitzgerald, F. Fleuret, S. L. Fokin, J. E. Frantz, A. Franz, A. D. Frawley, Y. Fukao, T. Fusayasu, K. Gainey, C. Gal, A. Garishvili, I. Garishvili, A. Glenn, X. Gong, M. Gonin, Y. Goto, R. Granier de Cassagnac, N. Grau, S. V. Greene, M. Grosse Perdekamp, T. Gunji, L. Guo, T. Guo, H. -Å. Gustafsson, T. Hachiya, J. S. Haggerty, K. I. Hahn, H. Hamagaki, J. Hanks, K. Hashimoto, E. Haslum, R. Hayano, T. K. Hemmick, T. Hester, X. He, J. C. Hill, A. Hodges, R. S. Hollis, K. Homma, B. Hong, T. Horaguchi, Y. Hori, T. Ichihara, H. Iinuma, Y. Ikeda, J. Imrek, M. Inaba, A. Iordanova, D. Isenhower, M. Issah, D. Ivanishchev, B. V. Jacak, M. Javani, X. Jiang, Z. Ji, B. M. Johnson, K. S. Joo, D. Jouan, D. S. Jumper, J. Kamin, S. Kaneti, B. H. Kang, J. H. Kang, J. S. Kang, J. Kapustinsky, K. Karatsu, M. Kasai, G. Kasza, D. Kawall, A. V. Kazantsev, T. Kempel, A. Khanzadeev, K. M. Kijima, B. I. Kim, C. Kim, D. J. Kim, E. -J. Kim, H. J. Kim, K. -B. Kim, Y. -J. Kim, Y. K. Kim, E. Kinney, Á. Kiss, E. Kistenev, J. Klatsky, D. Kleinjan, P. Kline, Y. Komatsu, B. Komkov, J. Koster, D. Kotchetkov, D. Kotov, L. Kovacs, F. Krizek, A. Král, G. J. Kunde, B. Kurgyis, K. Kurita, M. Kurosawa, Y. Kwon, G. S. Kyle, Y. S. Lai, J. G. Lajoie, A. Lebedev, B. Lee, D. M. Lee, J. Lee, K. B. Lee, K. S. Lee, S. H. Lee, S. R. Lee, M. J. Leitch, M. A. L. Leite, M. Leitgab, B. Lewis, S. H. Lim, L. A. Linden Levy, M. X. Liu, S. Lökös, D. A. Loomis, B. Love, C. F. Maguire, Y. I. Makdisi, M. Makek, A. Manion, V. I. Manko, E. Mannel, S. Masumoto, M. McCumber, P. L. McGaughey, D. McGlinchey, C. McKinney, M. Mendoza, B. Meredith, Y. Miake, T. Mibe, A. C. Mignerey, A. Milov, D. K. Mishra, J. T. Mitchell, M. Mitrankova, Iu. Mitrankov, Y. Miyachi, S. Miyasaka, A. K. Mohanty, S. Mohapatra, H. J. Moon, D. P. Morrison, D. P. Morrison, S. Motschwiller, T. V. Moukhanova, B. Mulilo, T. Murakami, J. Murata, A. Mwai, T. Nagae, S. Nagamiya, J. L. Nagle, J. L. Nagle, M. I. Nagy, I. Nakagawa, Y. Nakamiya, K. R. Nakamura, T. Nakamura, K. Nakano, C. Nattrass, A. Nederlof, M. Nihashi, R. Nouicer, T. Novák, N. Novitzky, G. Nukazuka, A. S. Nyanin, E. O'Brien, C. A. Ogilvie, K. Okada, M. Orosz, A. Oskarsson, M. Ouchida, K. Ozawa, R. Pak, V. Pantuev, V. Papavassiliou, B. H. Park, I. H. Park, J. S. Park, S. Park, S. K. Park, L. Patel, S. F. Pate, H. Pei, J. -C. Peng, H. Pereira, D. Yu. Peressounko, R. Petti, C. Pinkenburg, R. P. Pisani, M. Potekhin, M. Proissl, M. L. Purschke, H. Qu, J. Rak, I. Ravinovich, K. F. Read, D. Reynolds, V. Riabov, Y. Riabov, E. Richardson, D. Richford, D. Roach, G. Roche, S. D. Rolnick, M. Rosati, B. Sahlmueller, N. Saito, T. Sakaguchi, V. Samsonov, M. Sano, M. Sarsour, S. Sawada, K. Sedgwick, R. Seidl, A. Sen, R. Seto, D. Sharma, I. Shein, T. -A. Shibata, K. Shigaki, M. Shimomura, K. Shoji, P. Shukla, A. Sickles, C. L. Silva, D. Silvermyr, K. S. Sim, B. K. Singh, C. P. Singh, C. P. Singh, V. Singh, M. Slunečka, K. L. Smith, R. A. Soltz, W. E. Sondheim, S. P. Sorensen, I. V. Sourikova, P. W. Stankus, E. Stenlund, M. Stepanov, A. Ster, S. P. Stoll, T. Sugitate, A. Sukhanov, J. Sun, Z. Sun, J. Sziklai, E. M. Takagui, A. Takahara, A. Taketani, Y. Tanaka, S. Taneja, K. Tanida, M. J. Tannenbaum, S. Tarafdar, A. Taranenko, E. Tennant, H. Themann, T. Todoroki, L. Tomášek, M. Tomášek, H. Torii, R. S. Towell, I. Tserruya, Y. Tsuchimoto, T. Tsuji, B. Ujvari, C. Vale, H. W. van Hecke, M. Vargyas, E. Vazquez-Zambrano, A. Veicht, J. Velkovska, M. Virius, A. Vossen, V. Vrba, E. Vznuzdaev, R. Vértesi, X. R. Wang, D. Watanabe, K. Watanabe, Y. Watanabe, Y. S. Watanabe, F. Wei, R. Wei, S. N. White, D. Winter, S. Wolin, C. L. Woody, M. Wysocki, B. Xia, Y. L. Yamaguchi, R. Yang, A. Yanovich, J. Ying, S. Yokkaichi, I. Younus, Z. You, I. E. Yushmanov, W. A. Zajc, A. Zelenski
The PHENIX experiment measured the centrality dependence of two-pion Bose-Einstein correlation functions in $sqrt{s_{_{NN}}}=200$~GeV Au$+$Au collisions at the Relativistic Heavy Ion Collider at Brookhaven National Laboratory. The data are well represented by L'evy-stable source distributions. The extracted source parameters are the correlation-strength parameter $lambda$, the L'evy index of stability $alpha$, and the L'evy-scale parameter $R$ as a function of transverse mass $m_T$ and centrality. The $lambda(m_T)$ parameter is constant at larger values of $m_T$, but decreases as $m_T$ decreases. The L'evy scale parameter $R(m_T)$ decreases with $m_T$ and exhibits proportionality to the length scale of the nuclear overlap region. The L'evy exponent $alpha(m_T)$ is independent of $m_T$ within uncertainties in each investigated centrality bin, but shows a clear centrality dependence. At all centralities, the L'evy exponent $alpha$ is significantly different from that of Gaussian ($alpha=2$) or Cauchy ($alpha=1$) source distributions. Comparisons to the predictions of Monte-Carlo simulations of resonance-decay chains show that in all but the most peripheral centrality class (50%-60%), the obtained results are inconsistent with the measurements, unless a significant reduction of the in-medium mass of the $eta'$ meson is included. In each centrality class, the best value of the in-medium $eta'$ mass is compared to the mass of the $eta$ meson, as well as to several theoretical predictions that consider restoration of $U_A(1)$ symmetry in hot hadronic matter.
{"title":"Centrality dependence of Lévy-stable two-pion Bose-Einstein correlations in $sqrt{s_{_{NN}}}=200$ GeV Au$+$Au collisions","authors":"PHENIX Collaboration, N. J. Abdulameer, U. Acharya, A. Adare, C. Aidala, N. N. Ajitanand, Y. Akiba, R. Akimoto, H. Al-Ta'ani, J. Alexander, A. Angerami, K. Aoki, N. Apadula, Y. Aramaki, H. Asano, E. C. Aschenauer, E. T. Atomssa, T. C. Awes, B. Azmoun, V. Babintsev, M. Bai, B. Bannier, K. N. Barish, B. Bassalleck, S. Bathe, V. Baublis, S. Baumgart, A. Bazilevsky, R. Belmont, R. Belmont, A. Berdnikov, Y. Berdnikov, L. Bichon, B. Blankenship, D. S. Blau, J. S. Bok, V. Borisov, K. Boyle, M. L. Brooks, H. Buesching, V. Bumazhnov, S. Butsyk, S. Campbell, P. Castera, C. -H. Chen, D. Chen, M. Chiu, C. Y. Chi, I. J. Choi, J. B. Choi, S. Choi, R. K. Choudhury, P. Christiansen, T. Chujo, O. Chvala, V. Cianciolo, Z. Citron, B. A. Cole, M. Connors, M. Connors, R. Corliss, M. Csanád, T. Csörgő, L. D'Orazio, S. Dairaku, A. Datta, M. S. Daugherity, G. David, A. Denisov, A. Deshpande, E. J. Desmond, K. V. Dharmawardane, O. Dietzsch, L. Ding, A. Dion, M. Donadelli, V. Doomra, O. Drapier, A. Drees, K. A. Drees, J. M. Durham, A. Durum, S. Edwards, Y. V. Efremenko, T. Engelmore, A. Enokizono, R. Esha, K. O. Eyser, B. Fadem, D. E. Fields, M. Finger, Jr., M. Finger, D. Firak, D. Fitzgerald, F. Fleuret, S. L. Fokin, J. E. Frantz, A. Franz, A. D. Frawley, Y. Fukao, T. Fusayasu, K. Gainey, C. Gal, A. Garishvili, I. Garishvili, A. Glenn, X. Gong, M. Gonin, Y. Goto, R. Granier de Cassagnac, N. Grau, S. V. Greene, M. Grosse Perdekamp, T. Gunji, L. Guo, T. Guo, H. -Å. Gustafsson, T. Hachiya, J. S. Haggerty, K. I. Hahn, H. Hamagaki, J. Hanks, K. Hashimoto, E. Haslum, R. Hayano, T. K. Hemmick, T. Hester, X. He, J. C. Hill, A. Hodges, R. S. Hollis, K. Homma, B. Hong, T. Horaguchi, Y. Hori, T. Ichihara, H. Iinuma, Y. Ikeda, J. Imrek, M. Inaba, A. Iordanova, D. Isenhower, M. Issah, D. Ivanishchev, B. V. Jacak, M. Javani, X. Jiang, Z. Ji, B. M. Johnson, K. S. Joo, D. Jouan, D. S. Jumper, J. Kamin, S. Kaneti, B. H. Kang, J. H. Kang, J. S. Kang, J. Kapustinsky, K. Karatsu, M. Kasai, G. Kasza, D. Kawall, A. V. Kazantsev, T. Kempel, A. Khanzadeev, K. M. Kijima, B. I. Kim, C. Kim, D. J. Kim, E. -J. Kim, H. J. Kim, K. -B. Kim, Y. -J. Kim, Y. K. Kim, E. Kinney, Á. Kiss, E. Kistenev, J. Klatsky, D. Kleinjan, P. Kline, Y. Komatsu, B. Komkov, J. Koster, D. Kotchetkov, D. Kotov, L. Kovacs, F. Krizek, A. Král, G. J. Kunde, B. Kurgyis, K. Kurita, M. Kurosawa, Y. Kwon, G. S. Kyle, Y. S. Lai, J. G. Lajoie, A. Lebedev, B. Lee, D. M. Lee, J. Lee, K. B. Lee, K. S. Lee, S. H. Lee, S. R. Lee, M. J. Leitch, M. A. L. Leite, M. Leitgab, B. Lewis, S. H. Lim, L. A. Linden Levy, M. X. Liu, S. Lökös, D. A. Loomis, B. Love, C. F. Maguire, Y. I. Makdisi, M. Makek, A. Manion, V. I. Manko, E. Mannel, S. Masumoto, M. McCumber, P. L. McGaughey, D. McGlinchey, C. McKinney, M. Mendoza, B. Meredith, Y. Miake, T. Mibe, A. C. Mignerey, A. Milov, D. K. Mishra, J. T. Mitchell, M. Mitrankova, Iu. Mitrankov, Y. Miyachi, S. Miyasaka, A. K. Mohanty, S. Mohapatra, H. J. Moon, D. P. Morrison, D. P. Morrison, S. Motschwiller, T. V. Moukhanova, B. Mulilo, T. Murakami, J. Murata, A. Mwai, T. Nagae, S. Nagamiya, J. L. Nagle, J. L. Nagle, M. I. Nagy, I. Nakagawa, Y. Nakamiya, K. R. Nakamura, T. Nakamura, K. Nakano, C. Nattrass, A. Nederlof, M. Nihashi, R. Nouicer, T. Novák, N. Novitzky, G. Nukazuka, A. S. Nyanin, E. O'Brien, C. A. Ogilvie, K. Okada, M. Orosz, A. Oskarsson, M. Ouchida, K. Ozawa, R. Pak, V. Pantuev, V. Papavassiliou, B. H. Park, I. H. Park, J. S. Park, S. Park, S. K. Park, L. Patel, S. F. Pate, H. Pei, J. -C. Peng, H. Pereira, D. Yu. Peressounko, R. Petti, C. Pinkenburg, R. P. Pisani, M. Potekhin, M. Proissl, M. L. Purschke, H. Qu, J. Rak, I. Ravinovich, K. F. Read, D. Reynolds, V. Riabov, Y. Riabov, E. Richardson, D. Richford, D. Roach, G. Roche, S. D. Rolnick, M. Rosati, B. Sahlmueller, N. Saito, T. Sakaguchi, V. Samsonov, M. Sano, M. Sarsour, S. Sawada, K. Sedgwick, R. Seidl, A. Sen, R. Seto, D. Sharma, I. Shein, T. -A. Shibata, K. Shigaki, M. Shimomura, K. Shoji, P. Shukla, A. Sickles, C. L. Silva, D. Silvermyr, K. S. Sim, B. K. Singh, C. P. Singh, C. P. Singh, V. Singh, M. Slunečka, K. L. Smith, R. A. Soltz, W. E. Sondheim, S. P. Sorensen, I. V. Sourikova, P. W. Stankus, E. Stenlund, M. Stepanov, A. Ster, S. P. Stoll, T. Sugitate, A. Sukhanov, J. Sun, Z. Sun, J. Sziklai, E. M. Takagui, A. Takahara, A. Taketani, Y. Tanaka, S. Taneja, K. Tanida, M. J. Tannenbaum, S. Tarafdar, A. Taranenko, E. Tennant, H. Themann, T. Todoroki, L. Tomášek, M. Tomášek, H. Torii, R. S. Towell, I. Tserruya, Y. Tsuchimoto, T. Tsuji, B. Ujvari, C. Vale, H. W. van Hecke, M. Vargyas, E. Vazquez-Zambrano, A. Veicht, J. Velkovska, M. Virius, A. Vossen, V. Vrba, E. Vznuzdaev, R. Vértesi, X. R. Wang, D. Watanabe, K. Watanabe, Y. Watanabe, Y. S. Watanabe, F. Wei, R. Wei, S. N. White, D. Winter, S. Wolin, C. L. Woody, M. Wysocki, B. Xia, Y. L. Yamaguchi, R. Yang, A. Yanovich, J. Ying, S. Yokkaichi, I. Younus, Z. You, I. E. Yushmanov, W. A. Zajc, A. Zelenski","doi":"arxiv-2407.08586","DOIUrl":"https://doi.org/arxiv-2407.08586","url":null,"abstract":"The PHENIX experiment measured the centrality dependence of two-pion\u0000Bose-Einstein correlation functions in $sqrt{s_{_{NN}}}=200$~GeV Au$+$Au\u0000collisions at the Relativistic Heavy Ion Collider at Brookhaven National\u0000Laboratory. The data are well represented by L'evy-stable source\u0000distributions. The extracted source parameters are the correlation-strength\u0000parameter $lambda$, the L'evy index of stability $alpha$, and the\u0000L'evy-scale parameter $R$ as a function of transverse mass $m_T$ and\u0000centrality. The $lambda(m_T)$ parameter is constant at larger values of $m_T$,\u0000but decreases as $m_T$ decreases. The L'evy scale parameter $R(m_T)$ decreases\u0000with $m_T$ and exhibits proportionality to the length scale of the nuclear\u0000overlap region. The L'evy exponent $alpha(m_T)$ is independent of $m_T$\u0000within uncertainties in each investigated centrality bin, but shows a clear\u0000centrality dependence. At all centralities, the L'evy exponent $alpha$ is\u0000significantly different from that of Gaussian ($alpha=2$) or Cauchy\u0000($alpha=1$) source distributions. Comparisons to the predictions of\u0000Monte-Carlo simulations of resonance-decay chains show that in all but the most\u0000peripheral centrality class (50%-60%), the obtained results are inconsistent\u0000with the measurements, unless a significant reduction of the in-medium mass of\u0000the $eta'$ meson is included. In each centrality class, the best value of the\u0000in-medium $eta'$ mass is compared to the mass of the $eta$ meson, as well as\u0000to several theoretical predictions that consider restoration of $U_A(1)$\u0000symmetry in hot hadronic matter.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141609741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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