AI Article Synopsis
- Researchers conducted a search for Z bosons using the μ(+)μ(-) decay channel in lead-lead collisions at high energy levels (√S(NN)=2.76 TeV) with the CMS detector.
- They identified a total of 39 opposite-sign muon pairs in the invariant mass range of 60-120 GeV/c², leading to a calculated yield per event of approximately [33.8±5.5(stat)±4.4(syst)]×10(-8) in a rapidity range of |y|<2.0.
- The observed results align with next-to-leading order QCD predictions when adjusted for the number of incoherent nucleon-nucleon collisions.
Article Abstract
A search for Z bosons in the μ(+)μ(-) decay channel has been performed in PbPb collisions at √S(NN)=2.76 TeV with the CMS detector at the LHC, in a 7.2 μb(-1) 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.
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| http://dx.doi.org/10.1103/PhysRevLett.106.212301 | DOI Listing |
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