Study of Z production in PbPb and pp collisions at root s(NN)=2.76 TeV in the dimuon and dielectron decay channelsopen access
- Authors
- Chatrchyan, S; Khachatryan, V; Sirunyan, AM; Adam, W; Bergauer, T; Dragicevic, M; Eroe, J; Friedl, M; Fruehwirth, R; Kim, Tae Jeong
- Issue Date
- Apr-2015
- Publisher
- SPRINGER
- Keywords
- Heavy Ions; Heavy-ion collision; Particle and resonance production; proton-proton scattering
- Citation
- JOURNAL OF HIGH ENERGY PHYSICS, v.2015, no.3, pp.1 - 40
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF HIGH ENERGY PHYSICS
- Volume
- 2015
- Number
- 3
- Start Page
- 1
- End Page
- 40
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/143202
- DOI
- 10.1007/JHEP03(2015)022
- ISSN
- 1126-6708
- Abstract
- The production of Z bosons is studied in the dimuon and dielectron decay channels in PbPb and pp collisions at root s(NN) = 2.76TeV, using data collected by the CMS experiment at the LHC. The PbPb data sample corresponds to an integrated luminosity of about 166 mu b(-1), while the pp data sample collected in 2013 at the same nucleon-nucleon centre-of-mass energy has an integrated luminosity of 5.4 pb(-1). The Z boson yield is measured as a function of rapidity, transverse momentum, and collision centrality. The ratio of PbPb to pp yields, scaled by the number of inelastic nucleon-nucleon collisions, is found to be 1.06 +/- 0.05 (stat) +/- 0.08 (syst) in the dimuon channel and 1.02 +/- 0.08 (stat) +/- 0.15 (syst) in the dielectron channel, for centrality-integrated Z boson production. This binary collision scaling is seen to hold in the entire kinematic region studied, as expected for a colourless probe that is unaffected by the hot and dense QCD medium produced in heavy ion collisions.
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