Study of Z boson production in PbPb collisions at nucleon-nucleon centre of mass energy = 2.76 TeV

Journal Article · Sun May 01 00:00:00 EDT 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.106.212301· OSTI ID:1176784

Chatrchyan, S. ^[1]; et al.,

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1. Yerevan Physics Institute (Aremenia)

A search for Z bosons in the mu^+mu^- decay channel has been performed in PbPb collisions at a nucleon-nucleon centre of mass energy = 2.76 TeV with the CMS detector at the LHC, in a 7.2 inverse microbarn data sample. The number of opposite-sign muon pairs observed in the 60--120 GeV/c^2 invariant mass range is 39, corresponding to a yield per unit of rapidity (y) and per minimum bias event of (33.8 +/- 5.5 (stat) +/- 4.4 (syst)) 10^{-8}, in the |y|<2.0 range. Rapidity, transverse momentum, and centrality dependencies are also measured. The results agree with next-to-leading order QCD calculations, scaled by the number of incoherent nucleon-nucleon collisions.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: CMS Colloboration
• OSTI ID: 1176784
• Report Number(s): FERMILAB-PUB-11-760-CMS; CERN-EP-PH-2011-003; CMS-HIN-10-003; PRLTAO; ArticleNumber: 212301; arXiv eprint number arXiv:1102.5435
• Journal Information: Physical Review Letters, Vol. 106, Issue 21; ISSN 0031-9007
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS