Pub Date : 2020-06-24DOI: 10.1103/physrevc.102.044002
T. Yamaga, S. Ajimura, H. Asano, G. Beer, H. Bhang, M. Bragadireanu, P. Buehler, L. Busso, M. Cargnelli, S. Choi, C. Curceanu, S. Enomoto, H. Fujioka, Y. Fujiwara, T. Fukuda, C. Guaraldo, T. Hashimoto, R. Hayano, T. Hiraiwa, M. Iio, M. Iliescu, K. Inoue, Y. Ishiguro, T. Ishikawa, S. Ishimoto, K. Itahashi, M. Iwai, M. Iwasaki, K. Kanno, K. Kato, Y. Kato, S. Kawasaki, P. Kienle, H. Kou, Y. Ma, J. Marton, Y. Matsuda, Y. Mizoi, O. Morra, T. Nagae, H. Noumi, H. Ohnishi, S. Okada, H. Outa, K. Piscicchia, Y. Sada, A. Sakaguchi, F. Sakuma, M. Sato, A. Scordo, M. Sekimoto, H. Shi, K. Shirotori, D. Sirghi, F. Sirghi, S. Suzuki, T. Suzuki, K. Tanida, H. Tatsuno, M. Tokuda, D. Tomono, A. Toyoda, K. Tsukada, O. Doce, E. Widmann, T. Yamazaki, H. Yim, Q. Zhang, J. Zmeskal
We have performed an exclusive measurement of the $K^{-}+! ~^{3}{rm He} to Lambda pn$ reaction at an incident kaon momentum of $1 {rm GeV}/c$.In the $Lambda p$ invariant mass spectrum, a clear peak was observed below the mass threshold of $bar{K}!+!N!+!N$, as a signal of the kaonic nuclear bound state, $bar{K}NN$.The binding energy, decay width, and $S$-wave Gaussian reaction form-factor of this state were observed to be $B_{K} = 42pm3({rm stat.})^{+3}_{-4}({rm syst.}) {rm MeV}$, $Gamma_{K} = 100pm7({rm stat.})^{+19}_{-9}({rm syst.}) {rm MeV}$, and $Q_{K} = 383pm11({rm stat.})^{+4}_{-1}({rm syst.}) {rm MeV}/c$, respectively. The total production cross-section of $bar{K}NN$, determined by its $Lambda p$ decay mode, was $sigma^{tot}_{K} cdot BR_{Lambda p} = 9.3pm0.8({rm stat.})^{+1.4}_{-1.0}({rm syst.}) mu{rm b}$.We estimated the branching ratio of the $bar{K}NN$ state to the $Lambda p$ and $Sigma^{0}p$ decay modes as $BR_{Lambda p}/BR_{Sigma^{0}p} sim 1.7$, by assuming that the physical processes leading to the $Sigma N!N$ final states are analogous to those of $Lambda pn$.
{"title":"Observation of a \u0000K¯NN\u0000 bound state in the \u0000He3(K−,Λp)n\u0000 reaction","authors":"T. Yamaga, S. Ajimura, H. Asano, G. Beer, H. Bhang, M. Bragadireanu, P. Buehler, L. Busso, M. Cargnelli, S. Choi, C. Curceanu, S. Enomoto, H. Fujioka, Y. Fujiwara, T. Fukuda, C. Guaraldo, T. Hashimoto, R. Hayano, T. Hiraiwa, M. Iio, M. Iliescu, K. Inoue, Y. Ishiguro, T. Ishikawa, S. Ishimoto, K. Itahashi, M. Iwai, M. Iwasaki, K. Kanno, K. Kato, Y. Kato, S. Kawasaki, P. Kienle, H. Kou, Y. Ma, J. Marton, Y. Matsuda, Y. Mizoi, O. Morra, T. Nagae, H. Noumi, H. Ohnishi, S. Okada, H. Outa, K. Piscicchia, Y. Sada, A. Sakaguchi, F. Sakuma, M. Sato, A. Scordo, M. Sekimoto, H. Shi, K. Shirotori, D. Sirghi, F. Sirghi, S. Suzuki, T. Suzuki, K. Tanida, H. Tatsuno, M. Tokuda, D. Tomono, A. Toyoda, K. Tsukada, O. Doce, E. Widmann, T. Yamazaki, H. Yim, Q. Zhang, J. Zmeskal","doi":"10.1103/physrevc.102.044002","DOIUrl":"https://doi.org/10.1103/physrevc.102.044002","url":null,"abstract":"We have performed an exclusive measurement of the $K^{-}+! ~^{3}{rm He} to Lambda pn$ reaction at an incident kaon momentum of $1 {rm GeV}/c$.In the $Lambda p$ invariant mass spectrum, a clear peak was observed below the mass threshold of $bar{K}!+!N!+!N$, as a signal of the kaonic nuclear bound state, $bar{K}NN$.The binding energy, decay width, and $S$-wave Gaussian reaction form-factor of this state were observed to be $B_{K} = 42pm3({rm stat.})^{+3}_{-4}({rm syst.}) {rm MeV}$, $Gamma_{K} = 100pm7({rm stat.})^{+19}_{-9}({rm syst.}) {rm MeV}$, and $Q_{K} = 383pm11({rm stat.})^{+4}_{-1}({rm syst.}) {rm MeV}/c$, respectively. The total production cross-section of $bar{K}NN$, determined by its $Lambda p$ decay mode, was $sigma^{tot}_{K} cdot BR_{Lambda p} = 9.3pm0.8({rm stat.})^{+1.4}_{-1.0}({rm syst.}) mu{rm b}$.We estimated the branching ratio of the $bar{K}NN$ state to the $Lambda p$ and $Sigma^{0}p$ decay modes as $BR_{Lambda p}/BR_{Sigma^{0}p} sim 1.7$, by assuming that the physical processes leading to the $Sigma N!N$ final states are analogous to those of $Lambda pn$.","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87028662","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}
Pub Date : 2020-06-22DOI: 10.1103/physrevc.102.024308
Sathi Sharma, Arkabrata Gupta, M. R. Chowdhury, A. Mandal, A. Bisoi, V. Nanal, L. Tribedi, M. Sarkar
The slowest reaction in the CNO cycle 14N(p, gamma)15O has been studied by populating the E^lab_p =278 keV (E^r_c.m.=259 keV) proton capture resonant state of ^{15}O at 7556 keV. The strength of the resonance has been determined from the experimental data. The level lifetime of the sub-threshold resonant state at Ex=6792 keV, as well as the lifetimes of the 5181 keV and 6172 keV states, have been measured using the Doppler shift attenuation method (DSAM). The structural properties of the nucleus ^{15}O, such as, the level energies, transition strengths, level lifetimes, and spectroscopic factors, have been calculated theoretically by using the large basis shell model, which agrees reasonably well with the present as well as the previous experimental data.
{"title":"Proton capture resonant state of \u0000O15\u0000 at 7556 keV","authors":"Sathi Sharma, Arkabrata Gupta, M. R. Chowdhury, A. Mandal, A. Bisoi, V. Nanal, L. Tribedi, M. Sarkar","doi":"10.1103/physrevc.102.024308","DOIUrl":"https://doi.org/10.1103/physrevc.102.024308","url":null,"abstract":"The slowest reaction in the CNO cycle 14N(p, gamma)15O has been studied by populating the E^lab_p =278 keV (E^r_c.m.=259 keV) proton capture resonant state of ^{15}O at 7556 keV. The strength of the resonance has been determined from the experimental data. The level lifetime of the sub-threshold resonant state at Ex=6792 keV, as well as the lifetimes of the 5181 keV and 6172 keV states, have been measured using the Doppler shift attenuation method (DSAM). The structural properties of the nucleus ^{15}O, such as, the level energies, transition strengths, level lifetimes, and spectroscopic factors, have been calculated theoretically by using the large basis shell model, which agrees reasonably well with the present as well as the previous experimental data.","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88127954","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}
C. C. D. Akimov, J. Albert, Peibo An, C. Awe, P. Barbeau, B. Becker, V. Belov, M. Blackston, L. Blokland, A. Bolozdynya, B. Cabrera-Palmer, N. Chen, D. Chernyak, E. Conley, R. Cooper, J. Daughhetee, M. D. V. Coello, J. Detwiler, M. Durand, Y. Efremenko, S. Elliott, L. Fabris, M. Febbraro, W. Fox, A. Galindo-Uribarri, M. Green, K. S. Hansen, M. Heath, S. Hedges, M. Hughes, T. Johnson, M. Kaemingk, L. Kaufman, A. Khromov, A. Konovalov, E. Kozlova, A. Kumpan, L. Li, J. Librande, J. Link, J. Liu, K. Mann, D. Markoff, O. McGoldrick, H. Moreno, P. Mueller, J. Newby, D. Parno, S. Penttila, D. Pershey, D. Radford, R. Rapp, H. Ray, J. Raybern, O. Razuvaeva, D. Reyna, G. Rich, D. Rudik, J. Runge, D. Salvat, K. Scholberg, A. Shakirov, G. Simakov, G. Sinev, W. Snow, V. Sosnovtsev, B. Suh, R. Tayloe, K. Tellez-Giron-Flores, R. Thornton, I. Tolstukhin, J. Vanderwerp, R. Varner, C. Virtue, G. Visser, C. Wiseman, T. Wongjirad, J. Yang, Y. Yen, J. Yoo, C.-H. Yu, J. Zettlemoyer
Release of COHERENT collaboration data from the first detection of coherent elastic neutrino-nucleus scattering (CEvNS) on argon. This release corresponds with the results of "Analysis A" published in Akimov et al., arXiv:2003.10630 [nucl-ex]. Data is shared in a binned, text-based format representing both "signal" and "backgrounds" along with associated uncertainties such that the included data can be used to perform independent analyses. This document describes the contents of the data release as well as guidance on the use of the data. Included example code in C++ (ROOT) and Python show one possible use of the included data.
氩上相干弹性中微子核散射(CEvNS)首次探测相干协同数据的发布。本新闻稿与Akimov et al.， arXiv:2003.10630 [nuclear -ex]发表的“Analysis A”的结果一致。数据以一种分箱的、基于文本的格式共享，表示“信号”和“背景”以及相关的不确定性，以便所包含的数据可用于执行独立分析。本文档描述了数据发布的内容以及数据使用指南。包含在c++ (ROOT)和Python中的示例代码显示了所包含数据的一种可能用法。
{"title":"COHERENT Collaboration data release from the first detection of coherent elastic neutrino-nucleus scattering on argon","authors":"C. C. D. Akimov, J. Albert, Peibo An, C. Awe, P. Barbeau, B. Becker, V. Belov, M. Blackston, L. Blokland, A. Bolozdynya, B. Cabrera-Palmer, N. Chen, D. Chernyak, E. Conley, R. Cooper, J. Daughhetee, M. D. V. Coello, J. Detwiler, M. Durand, Y. Efremenko, S. Elliott, L. Fabris, M. Febbraro, W. Fox, A. Galindo-Uribarri, M. Green, K. S. Hansen, M. Heath, S. Hedges, M. Hughes, T. Johnson, M. Kaemingk, L. Kaufman, A. Khromov, A. Konovalov, E. Kozlova, A. Kumpan, L. Li, J. Librande, J. Link, J. Liu, K. Mann, D. Markoff, O. McGoldrick, H. Moreno, P. Mueller, J. Newby, D. Parno, S. Penttila, D. Pershey, D. Radford, R. Rapp, H. Ray, J. Raybern, O. Razuvaeva, D. Reyna, G. Rich, D. Rudik, J. Runge, D. Salvat, K. Scholberg, A. Shakirov, G. Simakov, G. Sinev, W. Snow, V. Sosnovtsev, B. Suh, R. Tayloe, K. Tellez-Giron-Flores, R. Thornton, I. Tolstukhin, J. Vanderwerp, R. Varner, C. Virtue, G. Visser, C. Wiseman, T. Wongjirad, J. Yang, Y. Yen, J. Yoo, C.-H. Yu, J. Zettlemoyer","doi":"10.5281/zenodo.3903810","DOIUrl":"https://doi.org/10.5281/zenodo.3903810","url":null,"abstract":"Release of COHERENT collaboration data from the first detection of coherent elastic neutrino-nucleus scattering (CEvNS) on argon. This release corresponds with the results of \"Analysis A\" published in Akimov et al., arXiv:2003.10630 [nucl-ex]. Data is shared in a binned, text-based format representing both \"signal\" and \"backgrounds\" along with associated uncertainties such that the included data can be used to perform independent analyses. This document describes the contents of the data release as well as guidance on the use of the data. Included example code in C++ (ROOT) and Python show one possible use of the included data.","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88236479","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}
Pub Date : 2020-06-03DOI: 10.1103/physrevc.102.024322
M. Stryjczyk, B. Andel, A. Andreyev, J. Cubiss, J. Pakarinen, K. Rezynkina, P. Van Duppen, S. Antalic, T. Berry, M. Borge, C. Clisu, D. Cox, H. de Witte, L. Fraile, H. Fynbo, L. Gaffney, L. Harkness-Brennan, M. Huyse, A. Illana, D. Judson, J. Konki, J. Kurcewicz, I. Lazarus, R. Lica, M. Madurga, N. Mărginean, R. Mărginean, C. Mihai, P. Mošať, E. Nácher, A. Negret, J. Ojala, J. Ovejas, R. Page, P. Papadakis, S. Pascu, A. Perea, Z. Podoly'ak, V. Pucknell, E. Rapisarda, F. Rotaru, C. Sotty, O. Tengblad, V. Vedia, S. Viñals, R. Wadsworth, N. Warr, K. Wrzosek-Lipska
Decay spectroscopy of the long-lived states in 186Tl has been performed at the ISOLDE Decay Station at ISOLDE, CERN. The � decay from the low-spin (2
在欧洲核子研究中心的ISOLDE衰变站进行了186Tl长寿命态的衰变光谱研究。低自旋(2)的衰变
{"title":"Decay studies of the long-lived states in \u0000Tl186","authors":"M. Stryjczyk, B. Andel, A. Andreyev, J. Cubiss, J. Pakarinen, K. Rezynkina, P. Van Duppen, S. Antalic, T. Berry, M. Borge, C. Clisu, D. Cox, H. de Witte, L. Fraile, H. Fynbo, L. Gaffney, L. Harkness-Brennan, M. Huyse, A. Illana, D. Judson, J. Konki, J. Kurcewicz, I. Lazarus, R. Lica, M. Madurga, N. Mărginean, R. Mărginean, C. Mihai, P. Mošať, E. Nácher, A. Negret, J. Ojala, J. Ovejas, R. Page, P. Papadakis, S. Pascu, A. Perea, Z. Podoly'ak, V. Pucknell, E. Rapisarda, F. Rotaru, C. Sotty, O. Tengblad, V. Vedia, S. Viñals, R. Wadsworth, N. Warr, K. Wrzosek-Lipska","doi":"10.1103/physrevc.102.024322","DOIUrl":"https://doi.org/10.1103/physrevc.102.024322","url":null,"abstract":"Decay spectroscopy of the long-lived states in 186Tl has been performed at the ISOLDE Decay \u0000Station at ISOLDE, CERN. The � decay from the low-spin (2","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82924659","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}
Pub Date : 2020-05-18DOI: 10.1103/physrevc.102.064329
I. Alekseev, S. Bakhlanov, A. Derbin, I. Drachnev, I. Kotina, I. Lomskaya, V. Muratova, N. V. Niyazova, D. Semenov, M. Trushin, E. Unzhakov
The precision measurement of the $beta-$spectrum shape for $^{210}$Bi (historically RaE) have been performed with a spectrometer based on semiconductor Si(Li) detector. This first forbidden non-unique transition has the transition form-factor strongly deviated from unity and knowledge of its spectrum would play an important role in low-background physics in presence of $^{210}$Pb background. The measured transition form-factor could be approximated as $S(W) = 1 + (-0.4363 pm 0.0037) W + (0.0523 pm 0.0010) W^2$, that is in good agreement with previous studies and has significantly increased parameter precision.
{"title":"Precision measurement of the \u0000Bi210 β\u0000 spectrum","authors":"I. Alekseev, S. Bakhlanov, A. Derbin, I. Drachnev, I. Kotina, I. Lomskaya, V. Muratova, N. V. Niyazova, D. Semenov, M. Trushin, E. Unzhakov","doi":"10.1103/physrevc.102.064329","DOIUrl":"https://doi.org/10.1103/physrevc.102.064329","url":null,"abstract":"The precision measurement of the $beta-$spectrum shape for $^{210}$Bi (historically RaE) have been performed with a spectrometer based on semiconductor Si(Li) detector. This first forbidden non-unique transition has the transition form-factor strongly deviated from unity and knowledge of its spectrum would play an important role in low-background physics in presence of $^{210}$Pb background. The measured transition form-factor could be approximated as $S(W) = 1 + (-0.4363 pm 0.0037) W + (0.0523 pm 0.0010) W^2$, that is in good agreement with previous studies and has significantly increased parameter precision.","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81980055","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}
Pub Date : 2020-05-13DOI: 10.5506/aphyspolbsupp.14.15
L. Doremalen
ALICE is devoted to the study of the properties of the Quark-Gluon Plasma (QGP). This state of matter is created in ultra-relativistic heavy-ion collisions at the LHC. Heavy quarks are considered effective probes of the QGP since, due to their large masses, they are produced in hard scattering processes and experience the full evolution of the hot and dense medium while interacting with its constituents. The heavy-quark measurements provide insights on processes like in-medium energy loss and hadronization. Measurements in proton-proton collisions provide the baseline for interpreting heavy-ion collision results and constitute an excellent test of pQCD calculations. In addition, proton-nucleus collisions allow separating cold nuclear matter effects from those due to the deconfined strongly interacting matter created in heavy-ion collisions. In this contribution, an overview of recent ALICE results for open heavy flavours, quarkonia, and heavy-flavour jets is presented.
{"title":"Overview of Heavy-flavour Measurements in ALICE","authors":"L. Doremalen","doi":"10.5506/aphyspolbsupp.14.15","DOIUrl":"https://doi.org/10.5506/aphyspolbsupp.14.15","url":null,"abstract":"ALICE is devoted to the study of the properties of the Quark-Gluon Plasma (QGP). This state of matter is created in ultra-relativistic heavy-ion collisions at the LHC. Heavy quarks are considered effective probes of the QGP since, due to their large masses, they are produced in hard scattering processes and experience the full evolution of the hot and dense medium while interacting with its constituents. The heavy-quark measurements provide insights on processes like in-medium energy loss and hadronization. Measurements in proton-proton collisions provide the baseline for interpreting heavy-ion collision results and constitute an excellent test of pQCD calculations. In addition, proton-nucleus collisions allow separating cold nuclear matter effects from those due to the deconfined strongly interacting matter created in heavy-ion collisions. In this contribution, an overview of recent ALICE results for open heavy flavours, quarkonia, and heavy-flavour jets is presented.","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81912208","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}
Pub Date : 2020-05-12DOI: 10.1051/EPJCONF/202023504003
D. Perepelitsa
The expected connections between signatures in the soft and hard sectors of small collision systems, and the status of experimental attempts to identify them, are discussed. These proceedings summarize the talk as given at the International Symposium on Multi-Particle Dynamics in September 2019 in Santa Fe, NM (ISMD19). As such, the choice of content and focus are selective and not intended to be comprehensive.
{"title":"Connection between soft and hard probes of small collision systems at RHIC and LHC","authors":"D. Perepelitsa","doi":"10.1051/EPJCONF/202023504003","DOIUrl":"https://doi.org/10.1051/EPJCONF/202023504003","url":null,"abstract":"The expected connections between signatures in the soft and hard sectors of small collision systems, and the status of experimental attempts to identify them, are discussed. These proceedings summarize the talk as given at the International Symposium on Multi-Particle Dynamics in September 2019 in Santa Fe, NM (ISMD19). As such, the choice of content and focus are selective and not intended to be comprehensive.","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72943645","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}
Pub Date : 2020-05-04DOI: 10.1146/annurev-nucl-030320-033923
S. Klein, P. Steinberg
Ultra-peripheral collisions of heavy ions and protons are the energy frontier for electromagnetic interactions. Both photonuclear and two-photon collisions are studied, at collision energies that are far higher than are available elsewhere. In this review, we will discuss physics topics that can be addressed with UPCs, including nuclear shadowing and nuclear structure and searches for beyond-standard-model physics.
{"title":"Photonuclear and Two-Photon Interactions at High-Energy Nuclear Colliders","authors":"S. Klein, P. Steinberg","doi":"10.1146/annurev-nucl-030320-033923","DOIUrl":"https://doi.org/10.1146/annurev-nucl-030320-033923","url":null,"abstract":"Ultra-peripheral collisions of heavy ions and protons are the energy frontier for electromagnetic interactions. Both photonuclear and two-photon collisions are studied, at collision energies that are far higher than are available elsewhere. In this review, we will discuss physics topics that can be addressed with UPCs, including nuclear shadowing and nuclear structure and searches for beyond-standard-model physics.","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82701154","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}
Pub Date : 2020-04-30DOI: 10.1016/j.nuclphysa.2020.121803
D. Hangal
{"title":"Studies of Quark and Gluon Contributions to Jets using Jet Charge Measurements in pp and PbPb Collisions","authors":"D. Hangal","doi":"10.1016/j.nuclphysa.2020.121803","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2020.121803","url":null,"abstract":"","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88872136","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}
Pub Date : 2020-04-27DOI: 10.5506/aphyspolbsupp.14.29
D. Andreou
During the second LHC long shutdown (LS2) the Inner Tracking System (ITS) of ALICE (A Large Ion Collider Experiment) will be replaced by seven layers of CMOS Monolithic Active Pixel Sensors (MAPS). The latest innovations in silicon imaging technology allow for the construction of large, ultra-thin silicon wafers which can further improve the capabilities of the ALICE tracker. The research and development studies towards the construction of a novel vertex detector have started. The detector installation has been proposed for the third LHC long shutdown (LS3) during which the three innermost layers shall be replaced by three cylindrical layers of large curved CMOS wafers. This upgrade (ITS3) will further improve the impact parameter resolution and the tracking efficiency of low momentum particles. The innermost layer will be positioned closer to the interaction point and the material budget will be reduced down to 0.05$%X_0$ per layer. Monte Carlo simulations of a simplified ITS3 geometry within the ITS2 design indicate an improvement in the impact parameter resolution and the tracking efficiency, which are of crucial importance for measurements of heavy-flavour hadrons. This contribution shows the improved performance for the example of the $Lambda_{mathrm{b}}$, for which the significance of its measurement is extracted based on these MC simulations. A significant improvement by almost a factor of three in the low momentum region compared to the ITS2 is observed.
{"title":"Heavy-flavour Measurements in Pb–Pb Collisions with the Upgraded ALICE Inner Tracking System","authors":"D. Andreou","doi":"10.5506/aphyspolbsupp.14.29","DOIUrl":"https://doi.org/10.5506/aphyspolbsupp.14.29","url":null,"abstract":"During the second LHC long shutdown (LS2) the Inner Tracking System (ITS) of ALICE (A Large Ion Collider Experiment) will be replaced by seven layers of CMOS Monolithic Active Pixel Sensors (MAPS). The latest innovations in silicon imaging technology allow for the construction of large, ultra-thin silicon wafers which can further improve the capabilities of the ALICE tracker. The research and development studies towards the construction of a novel vertex detector have started. The detector installation has been proposed for the third LHC long shutdown (LS3) during which the three innermost layers shall be replaced by three cylindrical layers of large curved CMOS wafers. This upgrade (ITS3) will further improve the impact parameter resolution and the tracking efficiency of low momentum particles. The innermost layer will be positioned closer to the interaction point and the material budget will be reduced down to 0.05$%X_0$ per layer. Monte Carlo simulations of a simplified ITS3 geometry within the ITS2 design indicate an improvement in the impact parameter resolution and the tracking efficiency, which are of crucial importance for measurements of heavy-flavour hadrons. This contribution shows the improved performance for the example of the $Lambda_{mathrm{b}}$, for which the significance of its measurement is extracted based on these MC simulations. A significant improvement by almost a factor of three in the low momentum region compared to the ITS2 is observed.","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84219853","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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