Measurement of dielectron production in central Pb-Pb collisions at root S-NN=2.76 TeV

doi:10.1103/PhysRevC.99.024002

CORC > 上海应用物理研究所 > 中国科学院上海应用物理研究所 > 中科院上海应用物理研究所2011-2017年

	Measurement of dielectron production in central Pb-Pb collisions at root S-NN=2.76 TeV
	Acharya, S ; Acosta, FT ; Adamova, D ; Adolfsson, J ; Aggarwal, MM ; Rinella, GA ; Agnello, M ; Agrawal, N ; Ahammed, Z ; Ahn, SU
刊名	PHYSICAL REVIEW C
	2019
卷号	99 期号:2 页码:—
关键词	DIRECT PHOTON PRODUCTION S-W INTERACTIONS AU COLLISIONS RHO-MESON DIMUON PRODUCTION PAIR PRODUCTION PP J/PSI ENHANCEMENT EMISSION
ISSN号	2469-9985
DOI	10.1103/PhysRevC.99.024002
文献子类	期刊论文
英文摘要	The first measurement of dielectron (e(+)e(-)) production in central (0-10%) Pb-Pb collisions at root S-NN = 2.76 TeV at the LHC is presented. The dielectron invariant-mass spectrum is compared to the expected contributions from hadron decays in the invariant-mass range 0 < m(ee) < 3.5 GeV/c(2). The ratio of data and the cocktail of hadronic contributions without vacuum rho(0) is measured in the invariant-mass range 0.15 < m(ee) < 0.7 GeV/c(2), where an excess of dielectrons is observed in other experiments, and its value is 1.40 +/- 0.28 (stat.) +/- 0.08 (syst.) +/- 0.27 (cocktail). The dielectron spectrum measured in the invariant mass range 0 < m(ee) < 1 GeV/c(2) is consistent with the predictions from two theoretical model calculations that include thermal dielectron production from both partonic and hadronic phases with in-medium broadened rho(0) meson. The fraction of direct virtual photons over inclusive virtual photons is extracted for dielectron pairs with invariant mass 0.1 < m(ee) < 0.3 GeV/c(2) and in the transverse-momentum intervals 1 <( )p(T,ee) < 2 GeV/c and 2 < p(T,ee) < 4 GeV/c. The measured fraction of virtual direct photons is consistent with the measurement of real direct photons by ALICE and with the expectations from previous dielectron measurements at RHIC within the experimental uncertainties.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/31694]
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.Univ Utrecht, Inst Subat Phys, Nikhef, Utrecht, Netherlands; 2.Inst Theoret & Expt Phys, Moscow, Russia; 3.Slovak Acad Sci, Inst Expt Phys, Kosice, Slovakia; 4.Homi Bhabha Natl Inst, Inst Phys, Bhubaneswar, India; 5.Czech Acad Sci, Inst Phys, Prague, Czech Republic; 6.ISS, Bucharest, Romania; 7.Goethe Univ Frankfurt, Inst Kernphys, Frankfurt, Germany; 8.Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City, DF, Mexico; 9.Univ Fed Rio Grande do Sul UFRGS, Inst Fis, Porto Alegre, RS, Brazil; 10.Univ Nacl Autonoma Mexico, Inst Fis, Mexico City, DF, Mexico;
推荐引用方式 GB/T 7714	Acharya, S,Acosta, FT,Adamova, D,et al. Measurement of dielectron production in central Pb-Pb collisions at root S-NN=2.76 TeV[J]. PHYSICAL REVIEW C,2019,99(2):—.
APA	Acharya, S.,Acosta, FT.,Adamova, D.,Adolfsson, J.,Aggarwal, MM.,...&Zou, S.(2019).Measurement of dielectron production in central Pb-Pb collisions at root S-NN=2.76 TeV.PHYSICAL REVIEW C,99(2),—.
MLA	Acharya, S,et al."Measurement of dielectron production in central Pb-Pb collisions at root S-NN=2.76 TeV".PHYSICAL REVIEW C 99.2(2019):—.