Charm and beauty isolation from heavy flavor decay electrons in p+p and Pb+Pb collisions at sNN = 5.02 TeV at LHC
We present an analysis on the heavy flavor hadron decay electrons with charm and beauty contributions decomposed via a data driven method in p+p and Pb+Pb collisions at sNN = 5.02 TeV at LHC. The transverse momentum pT spectra, nuclear modification factor RAA and azimuthal anisotropic flow v2 distri...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-09-01
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| Series: | Physics Letters B |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269322003835 |
| _version_ | 1811218606068858880 |
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| author | Dongsheng Li Fan Si Yidan Zhao Pengyu Zhou Yifei Zhang Xiujun Li Chengxi Yang |
| author_facet | Dongsheng Li Fan Si Yidan Zhao Pengyu Zhou Yifei Zhang Xiujun Li Chengxi Yang |
| author_sort | Dongsheng Li |
| collection | DOAJ |
| description | We present an analysis on the heavy flavor hadron decay electrons with charm and beauty contributions decomposed via a data driven method in p+p and Pb+Pb collisions at sNN = 5.02 TeV at LHC. The transverse momentum pT spectra, nuclear modification factor RAA and azimuthal anisotropic flow v2 distributions of electrons from charm and beauty decays are obtained. We find that the electron RAA from charm (RAAc→e) and beauty (RAAb→e) decays are suppressed at pT>2.0 GeV/c in Pb+Pb collisions, which indicates that charm and beauty interact with and lose their energy in the hot-dense medium. A less suppression of RAAb→e than RAAc→e at 2.0<pT<8.0 GeV/c is observed, which is consistent with the mass-dependent partonic energy loss scenario. A non-zero electron v2 from beauty decays (v2b→e) is observed and in good agreement with ALICE measurement. At low pT from 1.0 to 3.0 GeV/c, a discrepancy between RHIC and LHC results is observed with an 85% confidence level, which might be a possible hint of an energy-dependent behavior of beauty quarks reacting with the medium created in heavy-ion collisions. At 3.0<pT<7.0 GeV/c, v2b→e deviates from a number-of-constituent-quark (NCQ) scaling hypothesis, which favors that beauty quark is unlikely thermalized in heavy-ion collisions at LHC energy. |
| first_indexed | 2024-04-12T07:12:15Z |
| format | Article |
| id | doaj.art-f5dabb42050f432fb014b6e5b4d0c755 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-04-12T07:12:15Z |
| publishDate | 2022-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-f5dabb42050f432fb014b6e5b4d0c7552022-12-22T03:42:36ZengElsevierPhysics Letters B0370-26932022-09-01832137249Charm and beauty isolation from heavy flavor decay electrons in p+p and Pb+Pb collisions at sNN = 5.02 TeV at LHCDongsheng Li0Fan Si1Yidan Zhao2Pengyu Zhou3Yifei Zhang4Xiujun Li5Chengxi Yang6State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, ChinaState Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, ChinaState Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, ChinaState Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, ChinaCorresponding author.; State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, ChinaState Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, ChinaState Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, ChinaWe present an analysis on the heavy flavor hadron decay electrons with charm and beauty contributions decomposed via a data driven method in p+p and Pb+Pb collisions at sNN = 5.02 TeV at LHC. The transverse momentum pT spectra, nuclear modification factor RAA and azimuthal anisotropic flow v2 distributions of electrons from charm and beauty decays are obtained. We find that the electron RAA from charm (RAAc→e) and beauty (RAAb→e) decays are suppressed at pT>2.0 GeV/c in Pb+Pb collisions, which indicates that charm and beauty interact with and lose their energy in the hot-dense medium. A less suppression of RAAb→e than RAAc→e at 2.0<pT<8.0 GeV/c is observed, which is consistent with the mass-dependent partonic energy loss scenario. A non-zero electron v2 from beauty decays (v2b→e) is observed and in good agreement with ALICE measurement. At low pT from 1.0 to 3.0 GeV/c, a discrepancy between RHIC and LHC results is observed with an 85% confidence level, which might be a possible hint of an energy-dependent behavior of beauty quarks reacting with the medium created in heavy-ion collisions. At 3.0<pT<7.0 GeV/c, v2b→e deviates from a number-of-constituent-quark (NCQ) scaling hypothesis, which favors that beauty quark is unlikely thermalized in heavy-ion collisions at LHC energy.http://www.sciencedirect.com/science/article/pii/S0370269322003835Quark-gluon plasmaCharmBeautySemileptonic decayNuclear modification factorElliptic flow |
| spellingShingle | Dongsheng Li Fan Si Yidan Zhao Pengyu Zhou Yifei Zhang Xiujun Li Chengxi Yang Charm and beauty isolation from heavy flavor decay electrons in p+p and Pb+Pb collisions at sNN = 5.02 TeV at LHC Physics Letters B Quark-gluon plasma Charm Beauty Semileptonic decay Nuclear modification factor Elliptic flow |
| title | Charm and beauty isolation from heavy flavor decay electrons in p+p and Pb+Pb collisions at sNN = 5.02 TeV at LHC |
| title_full | Charm and beauty isolation from heavy flavor decay electrons in p+p and Pb+Pb collisions at sNN = 5.02 TeV at LHC |
| title_fullStr | Charm and beauty isolation from heavy flavor decay electrons in p+p and Pb+Pb collisions at sNN = 5.02 TeV at LHC |
| title_full_unstemmed | Charm and beauty isolation from heavy flavor decay electrons in p+p and Pb+Pb collisions at sNN = 5.02 TeV at LHC |
| title_short | Charm and beauty isolation from heavy flavor decay electrons in p+p and Pb+Pb collisions at sNN = 5.02 TeV at LHC |
| title_sort | charm and beauty isolation from heavy flavor decay electrons in p p and pb pb collisions at snn 5 02 tev at lhc |
| topic | Quark-gluon plasma Charm Beauty Semileptonic decay Nuclear modification factor Elliptic flow |
| url | http://www.sciencedirect.com/science/article/pii/S0370269322003835 |
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