Abstract

The production cross sections of the B^{+}, B^{0}, and B_{s}^{0} mesons, and of their charge conjugates, are measured via exclusive hadronic decays in p+Pb collisions at the center-of-mass energy sqrt[s_{NN}]=5.02 TeV with the CMS detector at the CERN LHC. The data set used for this analysis corresponds to an integrated luminosity of 34.6 nb^{-1}. The production cross sections are measured in the transverse momentum range between 10 and 60 GeV/c. No significant modification is observed compared to proton-proton perturbative QCD calculations scaled by the number of incoherent nucleon-nucleon collisions. These results provide a baseline for the study of in-medium b quark energy loss in Pb+Pb collisions.

Highlights

  • The production cross sections via exclusive hadronic decays in pofþthePbBcþo,lBli0s,ioannsdaBt 0sthmeecseonntesr,aonfd-moafsths eeinrecrhgayrgpeffisfficffiNffioffiNffinffi j1⁄4ug5at.0es2, are measured TeV with the CMS detector at the CERN LHC

  • Calculations scaled by the number of incoherent nucleon-nucleon collisions. These results provide a baseline for the study of in-medium b quark energy loss in Pb þ Pb collisions

  • Relativistic heavy ion collisions allow the study of quantum chromodynamics (QCD) at very high temperature and density

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Summary

Fit Signal

Week ending 22 JANUARY 2016 one Gaussian. The maximum of all variations is propagated as systematic uncertainty, and it is given in the case of Bþ by variation (i), and by variation (ii) for the other two mesons. The global in p þ Pb systematic uncertainty, listed in each panel and not included in the data points, comprises the uncertainties in the integrated luminosity measurement and the B meson branching fractions. The nuclear modification factors of the three B mesons do not show evidence for modification of p þ Pb data compared to the FONLL reference, in the considered pT range within the quoted uncertainties.

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Findings
CMS cross
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