Dielectron and heavy-quark production in inelastic and high-multiplicity proton-proton collisions at root s=13 TeV
文献类型：期刊论文
| 作者 | Acharya, S; Torales-Acosta, F; Adamova, D; Adolfsson, J; Aggarwal, MM; Rinella, GA; Agnello, M; Agrawal, N; Ahammed, Z; Ahn, SU |
| 刊名 | PHYSICS LETTERS B
 |
| 出版日期 | 2019 |
| 卷号 | 788期号:-页码:505—518 |
| ISSN号 | 0370-2693 |
| 关键词 | PLUS AU COLLISIONS PB-PB COLLISIONS PP COLLISIONS TRANSVERSE-MOMENTUM PHOTON PRODUCTION ROOT-S(NN)=200 GEV J/PSI PRODUCTION MESON PRODUCTION COLLECTIVITY DEPENDENCE |
| DOI | 10.1016/j.physletb.2018.11.009 |
| 文献子类 | 期刊论文 |
| 英文摘要 | The measurement of dielectron production is presented as a function of invariant mass and transverse momentum (p(T)) at midrapidity (vertical bar ye vertical bar < 0.8) in proton-proton (pp) collisions at a centre-of-mass energy of root s = 13 TeV. The contributions from light-hadron decays are calculated from their measured cross sections in pp collisions at root s = 7 TeV or 13 TeV. The remaining continuum stems from correlated semileptonic decays of heavy-flavour hadrons. Fitting the data with templates from two different MC event generators, PYTHIA and POWHEG, the charm and beauty cross sections at midrapidity are extracted for the first time at this collision energy: d sigma(c<(c)over bar>)/dy vertical bar(y=0) = 974 +/- 138 (stat.) +/- 140 (syst.) +/- 214(BR) mu b and d sigma(b (b) over bar)/dy vertical bar(y=0) = 79 +/- 14 (stat.) +/- 11 (syst.) +/- 5(BR) mu b using PYTHIA simulations and d sigma(c (c) over bar)/dy vertical bar(y=0) = 1417 +/- 184 (stat.) +/- 204 (syst.) +/- 312(BR) mu b and d sigma(b (b) over bar)/dy vertical bar(y=0) = 48 +/- 14 (stat.) +/- 7 (syst.) +/- 3(BR) mu b for POWHEG. These values, whose uncertainties are fully correlated between the two generators, are consistent with extrapolations from lower energies. The different results obtained with POWHEG and PYTHIA imply different kinematic correlations of the heavy-quark pairs in these two generators. Furthermore, comparisons of dielectron spectra in inelastic events and in events collected with a trigger on high charged-particle multiplicities are presented in various p(T) intervals. The differences are consistent with the already measured scaling of light-hadron and open-charm production at high charged-particle multiplicity as a function of p(T). Upper limits for the contribution of virtual direct photons are extracted at 90% confidence level and found to be in agreement with pQCD calculations. (C) 2018 The Author. Published by Elsevier B.V. |
| 语种 | 英语 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/31552]  |
| 专题 | 上海应用物理研究所_中科院上海应用物理研究所2011-2017年 |
| 作者单位 | 1.Sezione Ist Nazl Fis Nucl, Cagliari, Italy; 2.Univ Trieste, Dipartimento Fis, Trieste, Italy; 3.INFN, Sez Torino, Turin, Italy; 4.Sezione Ist Nazl Fis Nucl, Trieste, Italy; 5.Univ Turin, Dipartimento Fis, Turin, Italy; 6.Sezione Ist Nazl Fis Nucl, Turin, Italy; 7.Univ Bologna, Dipartimento Fis & Astron, Bologna, Italy; 8.Sezione Ist Nazl Fis Nucl, Bologna, Italy; 9.Univ Catania, Dipartimento Fis & Astron, Catania, Italy; 10.Sezione Ist Nazl Fis Nucl, Catania, Italy; |
| 推荐引用方式 GB/T 7714 | Acharya, S,Torales-Acosta, F,Adamova, D,et al. Dielectron and heavy-quark production in inelastic and high-multiplicity proton-proton collisions at root s=13 TeV[J]. PHYSICS LETTERS B,2019,788(-):505—518. |
| APA | Acharya, S.,Torales-Acosta, F.,Adamova, D.,Adolfsson, J.,Aggarwal, MM.,...&Zou, S.(2019).Dielectron and heavy-quark production in inelastic and high-multiplicity proton-proton collisions at root s=13 TeV.PHYSICS LETTERS B,788(-),505—518. |
| MLA | Acharya, S,et al."Dielectron and heavy-quark production in inelastic and high-multiplicity proton-proton collisions at root s=13 TeV".PHYSICS LETTERS B 788.-(2019):505—518. |
入库方式： OAI收割
来源：上海应用物理研究所
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