This is an addendum to the article [arXiv:2005.11995] "Dielectron production in proton-proton and proton-lead collisions at $sqrt{s_{mathrm{NN}}}$ = 5.02 TeV" published in Phys. Rev. C 102 no. 5, (2020) 055204. We update the extracted charm cross section at midrapidity given in Table 3 and Figure 4 (left) of the original publication with the fragmentation fractions of charm quarks in pp collisions published in Phys. Rev. D 105 (2022) L011103.
这是发表在《物理评论》C 102 第5期, (2020) 055204上的文章[arXiv:2005.11995]"Dielectron productionin proton-proton and proton-lead collisions at $sqrt{s_{mathrm{NN}}$ = 5.02TeV "的增刊。我们用发表在《物理评论》D 105 (2022) L011103上的粲夸克在pp对撞中的碎裂分数更新了原出版物中表3和图4（左）给出的中速度下的粲截面。
{"title":"Addendum: Dielectron production in proton-proton and proton-lead collisions at $sqrt{s_{rm NN}}$ = 5.02 TeV","authors":"ALICE Collaboration","doi":"arxiv-2409.12025","DOIUrl":"https://doi.org/arxiv-2409.12025","url":null,"abstract":"This is an addendum to the article [arXiv:2005.11995] \"Dielectron production\u0000in proton-proton and proton-lead collisions at $sqrt{s_{mathrm{NN}}}$ = 5.02\u0000TeV\" published in Phys. Rev. C 102 no. 5, (2020) 055204. We update the\u0000extracted charm cross section at midrapidity given in Table 3 and Figure 4\u0000(left) of the original publication with the fragmentation fractions of charm\u0000quarks in pp collisions published in Phys. Rev. D 105 (2022) L011103.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142252324","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 coherent J/$psi$ photoproduction cross section is measured for the first time at midrapidity in peripheral to semicentral Pb-Pb collisions at $sqrt{s_{rm NN}} = 5.02$ TeV. The centrality differential cross section ${rm d} sigma/ {rm d}y$ is reported for the centrality range 40-90%, together with the doubly-differential cross section ${rm d}^2 sigma /{rm d}y {rm d} p_{rm T}$, extracted in two peripheral centrality classes. The J/$psi$ mesons are reconstructed in the dielectron channel, in the rapidity interval $|y| <$ 0.9 using the ALICE central barrel detectors. The J/$psi$ cross section at midrapidity is statistically compatible to the earlier ALICE measurement at forward rapidity and at the same centre-of-mass energy, and shows only a mild centrality dependence over the covered range. Several sets of theoretical calculations taking into account the hadronic overlap in the collisions but ignoring possible final-state effects from a hot expanding medium are found to give a fairly good description of the current measurements within uncertainties.
{"title":"Coherent J/$ψ$ photoproduction at midrapidity in Pb-Pb collisions at $sqrt{s_{rm NN}} = 5.02$ TeV","authors":"ALICE Collaboration","doi":"arxiv-2409.11940","DOIUrl":"https://doi.org/arxiv-2409.11940","url":null,"abstract":"The coherent J/$psi$ photoproduction cross section is measured for the first\u0000time at midrapidity in peripheral to semicentral Pb-Pb collisions at\u0000$sqrt{s_{rm NN}} = 5.02$ TeV. The centrality differential cross section ${rm\u0000d} sigma/ {rm d}y$ is reported for the centrality range 40-90%, together with\u0000the doubly-differential cross section ${rm d}^2 sigma /{rm d}y {rm d}\u0000p_{rm T}$, extracted in two peripheral centrality classes. The J/$psi$ mesons\u0000are reconstructed in the dielectron channel, in the rapidity interval $|y| <$\u00000.9 using the ALICE central barrel detectors. The J/$psi$ cross section at\u0000midrapidity is statistically compatible to the earlier ALICE measurement at\u0000forward rapidity and at the same centre-of-mass energy, and shows only a mild\u0000centrality dependence over the covered range. Several sets of theoretical\u0000calculations taking into account the hadronic overlap in the collisions but\u0000ignoring possible final-state effects from a hot expanding medium are found to\u0000give a fairly good description of the current measurements within\u0000uncertainties.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":"208 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142252325","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}
W. S. Porter, B. Liu, D. Ray, A. A. Valverde, M. Li, M. R. Mumpower, M. Brodeur, D. P. Burdette, N. Callahan, A. Cannon, J. A. Clark, D. E. M. Hoff, A. M. Houff, F. G. Kondev, A. E. Lovell, A. T. Mohan, G. E. Morgan, C. Quick, G. Savard, K. S. Sharma, T. M. Sprouse, L. Varriano
Atomic masses are a foundational quantity in our understanding of nuclear structure, astrophysics and fundamental symmetries. The long-standing goal of creating a predictive global model for the binding energy of a nucleus remains a significant challenge, however, and prompts the need for precise measurements of atomic masses to serve as anchor points for model developments. We present precise mass measurements of neutron-rich Ru and Pd isotopes performed at the Californium Rare Isotope Breeder Upgrade facility at Argonne National Laboratory using the Canadian Penning Trap mass spectrometer. The masses of $^{108}$Ru, $^{110}$Ru and $^{116}$Pd were measured to a relative mass precision $delta m/m approx 10^{-8}$ via the phase-imaging ion-cyclotron-resonance technique, and represent an improvement of approximately an order of magnitude over previous measurements. These mass data were used in conjunction with the physically interpretable machine learning (PIML) model, which uses a mixture density neural network to model mass excesses via a mixture of Gaussian distributions. The effects of our new mass data on a Bayesian-updating of a PIML model are presented.
{"title":"Investigating the effects of precise mass measurements of Ru and Pd isotopes on machine learning mass modeling","authors":"W. S. Porter, B. Liu, D. Ray, A. A. Valverde, M. Li, M. R. Mumpower, M. Brodeur, D. P. Burdette, N. Callahan, A. Cannon, J. A. Clark, D. E. M. Hoff, A. M. Houff, F. G. Kondev, A. E. Lovell, A. T. Mohan, G. E. Morgan, C. Quick, G. Savard, K. S. Sharma, T. M. Sprouse, L. Varriano","doi":"arxiv-2409.12141","DOIUrl":"https://doi.org/arxiv-2409.12141","url":null,"abstract":"Atomic masses are a foundational quantity in our understanding of nuclear\u0000structure, astrophysics and fundamental symmetries. The long-standing goal of\u0000creating a predictive global model for the binding energy of a nucleus remains\u0000a significant challenge, however, and prompts the need for precise measurements\u0000of atomic masses to serve as anchor points for model developments. We present\u0000precise mass measurements of neutron-rich Ru and Pd isotopes performed at the\u0000Californium Rare Isotope Breeder Upgrade facility at Argonne National\u0000Laboratory using the Canadian Penning Trap mass spectrometer. The masses of\u0000$^{108}$Ru, $^{110}$Ru and $^{116}$Pd were measured to a relative mass\u0000precision $delta m/m approx 10^{-8}$ via the phase-imaging\u0000ion-cyclotron-resonance technique, and represent an improvement of\u0000approximately an order of magnitude over previous measurements. These mass data\u0000were used in conjunction with the physically interpretable machine learning\u0000(PIML) model, which uses a mixture density neural network to model mass\u0000excesses via a mixture of Gaussian distributions. The effects of our new mass\u0000data on a Bayesian-updating of a PIML model are presented.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":"65 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142252323","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 nuclear modification factor $R_mathrm{AA}$ of charm jets, identified by the presence of a D$^0$ meson among the jet constituents, has been measured for the first time in Pb-Pb collisions at a centre-of-mass energy per nucleon pair $sqrt{s_{rm NN}} = 5.02$ TeV with the ALICE detector at the LHC. The D$^0$ mesons and their charge conjugates are reconstructed from the hadronic decay D$^0to mathrm K^{-}pi^{+}$. Jets are reconstructed from D$^0$-meson candidates and charged particles using the anti-$k_mathrm{T}$ algorithm with jet resolution parameter $R=0.3$, in the jet transverse momentum ($p_mathrm{T}$) range $5< p_mathrm{T}^mathrm{ch~jet}<50$ GeV/$c$ and pseudorapidity $|eta^mathrm{ch~jet}| < 0.6$. A hint of reduced suppression in the charm-jet $R_mathrm{AA}$ is observed in comparison to inclusive jets in central Pb-Pb collisions with a significance of about 2$sigma$ in $20< p_mathrm{T}^mathrm{ch~jet}<50$ GeV/$c$, suggesting the in-medium energy loss to depend on both the difference between quark and gluon coupling strength (Casimir colour-charge effect) and quark mass (dead-cone effect). The data are compared with model calculations that include mass effects in the in-medium energy loss. Among these, LIDO provides the best description of the data, highlighting the role of mass effects in interpreting the results.
{"title":"Investigating charm quark energy loss in medium with the nuclear modification factor of D$^0$-tagged jets","authors":"ALICE Collaboration","doi":"arxiv-2409.11939","DOIUrl":"https://doi.org/arxiv-2409.11939","url":null,"abstract":"The nuclear modification factor $R_mathrm{AA}$ of charm jets, identified by\u0000the presence of a D$^0$ meson among the jet constituents, has been measured for\u0000the first time in Pb-Pb collisions at a centre-of-mass energy per nucleon pair\u0000$sqrt{s_{rm NN}} = 5.02$ TeV with the ALICE detector at the LHC. The D$^0$\u0000mesons and their charge conjugates are reconstructed from the hadronic decay\u0000D$^0to mathrm K^{-}pi^{+}$. Jets are reconstructed from D$^0$-meson\u0000candidates and charged particles using the anti-$k_mathrm{T}$ algorithm with\u0000jet resolution parameter $R=0.3$, in the jet transverse momentum\u0000($p_mathrm{T}$) range $5< p_mathrm{T}^mathrm{ch~jet}<50$ GeV/$c$ and\u0000pseudorapidity $|eta^mathrm{ch~jet}| < 0.6$. A hint of reduced suppression in\u0000the charm-jet $R_mathrm{AA}$ is observed in comparison to inclusive jets in\u0000central Pb-Pb collisions with a significance of about 2$sigma$ in $20<\u0000p_mathrm{T}^mathrm{ch~jet}<50$ GeV/$c$, suggesting the in-medium energy loss\u0000to depend on both the difference between quark and gluon coupling strength\u0000(Casimir colour-charge effect) and quark mass (dead-cone effect). The data are\u0000compared with model calculations that include mass effects in the in-medium\u0000energy loss. Among these, LIDO provides the best description of the data,\u0000highlighting the role of mass effects in interpreting the results.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142268725","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 the orbitally excited charm-strange mesons $mathrm{D_{s1}(1^{+})(2536)^+}$ and $mathrm{D_{s2}^{*}(2^{+})(2573)^+}$ were measured for the first time in proton--proton (pp) collisions at a center-of-mass energy of $sqrt{s} =13$ TeV with the ALICE experiment at the LHC. The $mathrm{D_{s1}^+}$ and $mathrm{D_{s2}^{*+}}$ mesons were measured at midrapidity ($|y|<0.5$) in minimum-bias and high-multiplicity pp collisions in the transverse-momentum interval $2 < p_{rm T} < 24$ GeV/$c$. Their production yields relative to the $mathrm{D_{s}^{+}}$ ground-state yield were found to be compatible between minimum-bias and high-multiplicity collisions, as well as with previous measurements in $mathrm{e^pm p}$ and $mathrm{e^{+}e^{-}}$ collisions. The measured $mathrm{D_{s1}^+/D_{s}^{+}}$ and $mathrm{D_{s2}^{*+}/D_{s}^{+}}$ yield ratios are described by statistical hadronization models and can be used to tune the parameters governing the production of excited charm-strange hadrons in Monte Carlo generators, such as PYTHIA 8.
{"title":"First measurement of $mathrm{D_{s1}}(1^{+})(2536)^+$ and $mathrm{D_{s2}^{*}(2^{+})(2573)^+}$ production in proton--proton collisions at $sqrt{s} = 13$ TeV at the LHC","authors":"ALICE Collaboration","doi":"arxiv-2409.11938","DOIUrl":"https://doi.org/arxiv-2409.11938","url":null,"abstract":"The production yields of the orbitally excited charm-strange mesons\u0000$mathrm{D_{s1}(1^{+})(2536)^+}$ and $mathrm{D_{s2}^{*}(2^{+})(2573)^+}$ were\u0000measured for the first time in proton--proton (pp) collisions at a\u0000center-of-mass energy of $sqrt{s} =13$ TeV with the ALICE experiment at the\u0000LHC. The $mathrm{D_{s1}^+}$ and $mathrm{D_{s2}^{*+}}$ mesons were measured at\u0000midrapidity ($|y|<0.5$) in minimum-bias and high-multiplicity pp collisions in\u0000the transverse-momentum interval $2 < p_{rm T} < 24$ GeV/$c$. Their production\u0000yields relative to the $mathrm{D_{s}^{+}}$ ground-state yield were found to be\u0000compatible between minimum-bias and high-multiplicity collisions, as well as\u0000with previous measurements in $mathrm{e^pm p}$ and $mathrm{e^{+}e^{-}}$\u0000collisions. The measured $mathrm{D_{s1}^+/D_{s}^{+}}$ and\u0000$mathrm{D_{s2}^{*+}/D_{s}^{+}}$ yield ratios are described by statistical\u0000hadronization models and can be used to tune the parameters governing the\u0000production of excited charm-strange hadrons in Monte Carlo generators, such as\u0000PYTHIA 8.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142252350","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}
This study presents the first measurement of the f$_{1}$(1285) resonance using the ALICE detector in inelastic proton--proton collisions at a center-of-mass energy of 13 TeV. The resonance is reconstructed at midrapidity ($|y| <$ 0.5) through the hadronic decay channel f$_{1} (1285) rightarrow mathrm{K^{0}_{S} K^{pm}pi^{mp}}$. Key measurements include the determination of its mass, transverse-momentum integrated yield, and average transverse momentum. Additionally, the ratio of the transverse-momentum integrated yield of f$_{1}$(1285) to pion is compared with calculations from the canonical statistical hadronization model. The model calculation, assuming a zero total strangeness content for f$_{1}$(1285), reproduces the data within 1$sigma$ deviation, shedding light on the quark composition of f$_{1}$(1285).
{"title":"Measurement of f$_{1}$(1285) production in pp collisions at $mathbf{sqrt{textit s}}$ = 13 TeV","authors":"ALICE Collaboration","doi":"arxiv-2409.11936","DOIUrl":"https://doi.org/arxiv-2409.11936","url":null,"abstract":"This study presents the first measurement of the f$_{1}$(1285) resonance\u0000using the ALICE detector in inelastic proton--proton collisions at a\u0000center-of-mass energy of 13 TeV. The resonance is reconstructed at midrapidity\u0000($|y| <$ 0.5) through the hadronic decay channel f$_{1} (1285) rightarrow\u0000mathrm{K^{0}_{S} K^{pm}pi^{mp}}$. Key measurements include the\u0000determination of its mass, transverse-momentum integrated yield, and average\u0000transverse momentum. Additionally, the ratio of the transverse-momentum\u0000integrated yield of f$_{1}$(1285) to pion is compared with calculations from\u0000the canonical statistical hadronization model. The model calculation, assuming\u0000a zero total strangeness content for f$_{1}$(1285), reproduces the data within\u00001$sigma$ deviation, shedding light on the quark composition of f$_{1}$(1285).","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142268619","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}
To explore the quantum chromodynamics (QCD) phase transitions and the properties of quark$-$gluon plasma, the ALICE collaboration at CERN has conducted an extensive analysis of the correlations among net-conserved quantities, namely net-baryon, net-charge, and net-strangeness. These correlations are essential for understanding the QCD phase structure, as they are directly connected to ratios of thermodynamic susceptibilities calculated in lattice QCD. This analysis focuses on the correlations between net-kaon and net-proton, as well as net-kaon and net-charge, in Pb$-$Pb collisions at $sqrt{s_mathrm{NN}} = 5.02$ TeV, where net-proton and net-kaon serve as effective proxies for net-baryon and net-strangeness, respectively. A comparison with theoretical predictions from the Thermal-FIST model sheds light on the role of resonance decays and the effects of charge conservation laws in shaping these correlations. Furthermore, the measurements show sensitivity to the correlation volume in which these conservation laws are applied, underscoring the importance of modeling the underlying dynamics to fully understand the experimental results on fluctuations and correlations in heavy-ion collisions.
{"title":"Investigating baryon-strangeness and charge-strangeness correlations in Pb$-$Pb collisions at $sqrt{s_mathrm{NN}}$ = 5.02 TeV with ALICE","authors":"Swati Sahafor the ALICE Collaboration","doi":"arxiv-2409.10939","DOIUrl":"https://doi.org/arxiv-2409.10939","url":null,"abstract":"To explore the quantum chromodynamics (QCD) phase transitions and the\u0000properties of quark$-$gluon plasma, the ALICE collaboration at CERN has\u0000conducted an extensive analysis of the correlations among net-conserved\u0000quantities, namely net-baryon, net-charge, and net-strangeness. These\u0000correlations are essential for understanding the QCD phase structure, as they\u0000are directly connected to ratios of thermodynamic susceptibilities calculated\u0000in lattice QCD. This analysis focuses on the correlations between net-kaon and\u0000net-proton, as well as net-kaon and net-charge, in Pb$-$Pb collisions at\u0000$sqrt{s_mathrm{NN}} = 5.02$ TeV, where net-proton and net-kaon serve as\u0000effective proxies for net-baryon and net-strangeness, respectively. A\u0000comparison with theoretical predictions from the Thermal-FIST model sheds light\u0000on the role of resonance decays and the effects of charge conservation laws in\u0000shaping these correlations. Furthermore, the measurements show sensitivity to\u0000the correlation volume in which these conservation laws are applied,\u0000underscoring the importance of modeling the underlying dynamics to fully\u0000understand the experimental results on fluctuations and correlations in\u0000heavy-ion collisions.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142252351","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}
In ultra-relativistic heavy ion collisions, the photoproduction of high-energy jets can be used to constrain nuclear parton distributions for a wide range of parton kinematics. Results are presented from a measurement of photonuclear production of dijet and multi-jet final states in ultra-peripheral mbox{Pb+Pb} collisions at $sqrt{s_{text{NN}}} = 5.02$ TeV using a data set recorded in 2018 with the ATLAS detector at the LHC and corresponding to an integrated luminosity of 1.72 $text{nb}^{-1}$. Photonuclear final states are selected by requiring a rapidity gap in the photon direction; this selects events where one of the outgoing nuclei remains intact. Jets are reconstructed using the anti-$k_text{t}$ algorithm with radius parameter, $R = 0.4$. Triple-differential cross-sections, unfolded for detector response, are measured and presented using two sets of kinematic variables. The first set consists of the total transverse momentum ($H_text{T}$), rapidity, and mass of the jet system. The second set uses $H_text{T}$ and particle-level nuclear and photon parton momentum fractions, $x_text{A}$ and $z_{gamma}$, respectively. The results are compared with leading-order perturbative QCD calculations of photonuclear jet production cross-sections, demonstrating their potential to provide a strong new constraint on nuclear parton distributions.
{"title":"Measurement of photonuclear jet production in ultra-peripheral Pb+Pb collisions at $sqrt{s_{text{NN}}} = 5.02$ TeV with the ATLAS detector","authors":"ATLAS Collaboration","doi":"arxiv-2409.11060","DOIUrl":"https://doi.org/arxiv-2409.11060","url":null,"abstract":"In ultra-relativistic heavy ion collisions, the photoproduction of\u0000high-energy jets can be used to constrain nuclear parton distributions for a\u0000wide range of parton kinematics. Results are presented from a measurement of\u0000photonuclear production of dijet and multi-jet final states in ultra-peripheral\u0000mbox{Pb+Pb} collisions at $sqrt{s_{text{NN}}} = 5.02$ TeV using a data set\u0000recorded in 2018 with the ATLAS detector at the LHC and corresponding to an\u0000integrated luminosity of 1.72 $text{nb}^{-1}$. Photonuclear final states are\u0000selected by requiring a rapidity gap in the photon direction; this selects\u0000events where one of the outgoing nuclei remains intact. Jets are reconstructed\u0000using the anti-$k_text{t}$ algorithm with radius parameter, $R = 0.4$.\u0000Triple-differential cross-sections, unfolded for detector response, are\u0000measured and presented using two sets of kinematic variables. The first set\u0000consists of the total transverse momentum ($H_text{T}$), rapidity, and mass of\u0000the jet system. The second set uses $H_text{T}$ and particle-level nuclear and\u0000photon parton momentum fractions, $x_text{A}$ and $z_{gamma}$, respectively.\u0000The results are compared with leading-order perturbative QCD calculations of\u0000photonuclear jet production cross-sections, demonstrating their potential to\u0000provide a strong new constraint on nuclear parton distributions.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142252353","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}
Arie Bodek, M. E. Christy, Zihao Lin, Giulia-Maria Bulugean, Amii Matamoros Delgado, Artur M. Ankowski, Julia Tena Vidal
We have performed a global extraction of the ${rm ^{12}C}$ longitudinal (${cal R}_L$) and transverse (${cal R}_T$) nuclear electromagnetic response functions from an analysis of all available electron scattering data on carbon. The response functions are extracted for energy transfer $nu$, spanning the nuclear excitation, quasielastic (QE), resonance and inelastic continuum over a large range of the square of the four-momentum transfer ($Q^2$), for fixed values of $Q^2$ and for fixed values of 3-momentum transfer $bf q$. The data sample consists of approximately 10,000 differential electron scattering and photo-absorption-cross section measurement points for ${rm ^{12}C}$. In addition, we perform a universal fit to all ${rm ^{12}C}$ electron scattering data which also provides parmeterizations of ${cal R}_L$ and ${cal R}_T$ over a larger kinematic range. Since the extracted response functions and the universal fit cover a large range of $Q^2$ and $nu$, they can be readily used for comparison to theoretical predictions as well as validating and tuning Monte Carlo generators for electron and neutrino scattering experiments. In this paper we focus on the nuclear excitation, QE, and $Delta$(1232) regions and compare the measurements to predictions of the following theoretical approaches: ``Energy Dependent-Relativistic Mean Field'' (ED-RMF), ``Green's Function Monte Carlo'' (GFMC), "Short Time Approximation Quantum Monte Carlo" (STA-QMC), "Correlated Fermi Gas" (CFG), as well as the {textsc{NuWro}}, {{sc{achilles}}}~ and {{sc{genie}}}~generators. We find that among all the models ED-RMF provides the best description of both the QE and {it nuclear excitations} response functions over the largest kinematic range $0.01le Q^2 le 1.25$ GeV$^2$. The ED-RMF formalism has the added benefit that it should be directly applicable to the same kinematic regions for neutrino scattering.
{"title":"Global Extraction of the $rm^{12}C$ Nuclear Electromagnetic Response Functions (${cal R}_L$ and ${cal R}_T$) and Comparisons to Nuclear Theory and Neutrino/Electron Monte Carlo Generators","authors":"Arie Bodek, M. E. Christy, Zihao Lin, Giulia-Maria Bulugean, Amii Matamoros Delgado, Artur M. Ankowski, Julia Tena Vidal","doi":"arxiv-2409.10637","DOIUrl":"https://doi.org/arxiv-2409.10637","url":null,"abstract":"We have performed a global extraction of the ${rm ^{12}C}$ longitudinal\u0000(${cal R}_L$) and transverse (${cal R}_T$) nuclear electromagnetic response\u0000functions from an analysis of all available electron scattering data on carbon.\u0000The response functions are extracted for energy transfer $nu$, spanning the\u0000nuclear excitation, quasielastic (QE), resonance and inelastic continuum over a\u0000large range of the square of the four-momentum transfer ($Q^2$), for fixed\u0000values of $Q^2$ and for fixed values of 3-momentum transfer $bf q$. The data\u0000sample consists of approximately 10,000 differential electron scattering and\u0000photo-absorption-cross section measurement points for ${rm ^{12}C}$. In\u0000addition, we perform a universal fit to all ${rm ^{12}C}$ electron scattering\u0000data which also provides parmeterizations of ${cal R}_L$ and ${cal R}_T$ over\u0000a larger kinematic range. Since the extracted response functions and the\u0000universal fit cover a large range of $Q^2$ and $nu$, they can be readily used\u0000for comparison to theoretical predictions as well as validating and tuning\u0000Monte Carlo generators for electron and neutrino scattering experiments. In\u0000this paper we focus on the nuclear excitation, QE, and $Delta$(1232) regions\u0000and compare the measurements to predictions of the following theoretical\u0000approaches: ``Energy Dependent-Relativistic Mean Field'' (ED-RMF), ``Green's\u0000Function Monte Carlo'' (GFMC), \"Short Time Approximation Quantum Monte Carlo\"\u0000(STA-QMC), \"Correlated Fermi Gas\" (CFG), as well as the {textsc{NuWro}}, \u0000{{sc{achilles}}}~ and {{sc{genie}}}~generators. We find that among all the\u0000models ED-RMF provides the best description of both the QE and {it nuclear\u0000excitations} response functions over the largest kinematic range $0.01le Q^2\u0000le 1.25$ GeV$^2$. The ED-RMF formalism has the added benefit that it should be\u0000directly applicable to the same kinematic regions for neutrino scattering.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142252352","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}
In relativistic heavy-ion collisions, the extractions of properties of quark-gluon plasma (QGP) are hindered by a limited understanding of its initial conditions, where the nuclear structure of the colliding ions play a significant role. In these proceedings, we present the first quantitative demonstration using ``collective flow assisted nuclear shape imaging" method to extract the quadrupole deformation and triaxiality from $^{238}$U using data from the Relativistic Heavy Ion Collider (RHIC). We achieve this by comparing bulk observables in $^{238}$U+$^{238}$U collisions with nearly spherical $^{197}$Au+$^{197}$Au collisions. A similar comparative measurement performed in collisions of $^{96}$Ru+$^{96}$Ru and $^{96}$Zr+$^{96}$Zr, suggests the presence of moderate quadrupole deformation of $^{96}$Ru, large octupole deformation of $^{96}$Zr, as well as an apparent neutron skin difference between these two species. The prospect of this nuclear shape imaging method as a novel tool for the study of nuclear structure is also elaborated.
{"title":"Imaging the structure of atomic nuclei in high-energy nuclear collisions from STAR experiment","authors":"Chunjian Zhangfor the STAR Collaboration","doi":"arxiv-2409.09599","DOIUrl":"https://doi.org/arxiv-2409.09599","url":null,"abstract":"In relativistic heavy-ion collisions, the extractions of properties of\u0000quark-gluon plasma (QGP) are hindered by a limited understanding of its initial\u0000conditions, where the nuclear structure of the colliding ions play a\u0000significant role. In these proceedings, we present the first quantitative\u0000demonstration using ``collective flow assisted nuclear shape imaging\" method to\u0000extract the quadrupole deformation and triaxiality from $^{238}$U using data\u0000from the Relativistic Heavy Ion Collider (RHIC). We achieve this by comparing\u0000bulk observables in $^{238}$U+$^{238}$U collisions with nearly spherical\u0000$^{197}$Au+$^{197}$Au collisions. A similar comparative measurement performed\u0000in collisions of $^{96}$Ru+$^{96}$Ru and $^{96}$Zr+$^{96}$Zr, suggests the\u0000presence of moderate quadrupole deformation of $^{96}$Ru, large octupole\u0000deformation of $^{96}$Zr, as well as an apparent neutron skin difference\u0000between these two species. The prospect of this nuclear shape imaging method as\u0000a novel tool for the study of nuclear structure is also elaborated.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142252354","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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