Dielectron production in proton-proton collisions at root s=7 TeV

doi:10.1007/JHEP09(2018)064

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	Dielectron production in proton-proton collisions at root s=7 TeV
	Acharya, S ; Collaboration, A ; Acosta, FT ; Adamova, D ; Adolfsson, J ; Aggarwal, MM ; Rinella, GA ; Agnello, M ; Agrawal, N ; Ahammed, Z
刊名	JOURNAL OF HIGH ENERGY PHYSICS
	2018
期号	9 页码:-
关键词	HEAVY-ION COLLISIONS PHYSICS PERFORMANCE REPORT TRANSITION FORM-FACTORS PB-AU COLLISIONS ENERGY-LOSS TRANSVERSE-MOMENTUM CHIRAL RESTORATION PHOTON PRODUCTION MESON PRODUCTION THERMAL DIMUONS
ISSN号	1029-8479
DOI	10.1007/JHEP09(2018)064
文献子类	期刊论文
英文摘要	The first measurement of e(+)e(-) pair production at mid-rapidity (vertical bar eta vertical bar(e) < 0.8) in pp collisions at root s = 7TeV with ALICE at the LHC is presented. The dielectron production is studied as a function of the invariant mass (m(ee )< 3.3 GeV/c(2)), the pair transverse momentum (p(T,ee) < 8 GeV/c), and the pair transverse impact parameter (DCA(ee)), i.e., the average distance of closest approach of the reconstructed electron and positron tracks to the collision vertex, normalised to its resolution. The results are compared with the expectations from a cocktail of known hadronic sources and are well described when PYTHIA is used to generate the heavy-flavour contributions. In the low-mass region (0.14 < m(ee) < 1.1 GeV/c(2)), prompt and non-prompt e(+)e(-) sources can be separated via the DCA(ee). In the intermediate-mass region (1.1 < m(ee) < 2.7 GeV/c(2)), a double-differential fit to the data in m(ee) and p(T,ee) and a fit of the DCA(ee) distribution allow the total cc and bb cross sections to be extracted. Two different event generators, PYTHIA and POWHEG, can reproduce the shape of the two-dimensional m(ee) and p(T,ee) spectra, as well as the shape , of the DCA(ee) distribution, reasonably well. However, differences in the c (c) over bar and b (b) over bar cross sections are observed when using the generators to extrapolate to full phase space. Finally, the ratio of inclusive to decay photons is studied via the measurement of virtual direct photons in the transverse-momentum range 1 < p(T) < 8 GeV/c. This is found to be unity within the statistical and systematic uncertainties and consistent with expectations from next-to-leading order perturbative quantum chromodynamic calculations.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/30900]
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.STFC Daresbury Lab, Nucl Phys Grp, Daresbury, England 2.Czech Acad Sci, Nucl Phys Inst, Prague, Czech Republic 3.Oak Ridge Natl Lab, Oak Ridge, TN USA 4.Petersburg Nucl Phys Inst, Gatchina, Russia 5.Univ Zagreb, Fac Sci, Phys Dept, Zagreb, Croatia 6.Panjab Univ, Phys Dept, Chandigarh, India 7.Univ Jammu, Phys Dept, Jammu, India 8.Univ Rajasthan, Phys Dept, Jaipur, Rajasthan, India 9.Eberhard Karls Univ Tubingen, Phys Inst, Tubingen, Germany 10.Heidelberg Univ, Phys Inst, Heidelberg, Germany
推荐引用方式 GB/T 7714	Acharya, S,Collaboration, A,Acosta, FT,et al. Dielectron production in proton-proton collisions at root s=7 TeV[J]. JOURNAL OF HIGH ENERGY PHYSICS,2018(9):-.
APA	Acharya, S.,Collaboration, A.,Acosta, FT.,Adamova, D.,Adolfsson, J.,...&Zou, S.(2018).Dielectron production in proton-proton collisions at root s=7 TeV.JOURNAL OF HIGH ENERGY PHYSICS(9),-.
MLA	Acharya, S,et al."Dielectron production in proton-proton collisions at root s=7 TeV".JOURNAL OF HIGH ENERGY PHYSICS .9(2018):-.