Measurement of the B± Meson Nuclear Modification Factor in Pb-Pb Collisions at sNN =5.02 TeV

• Main Authors: Sirunyan, A. M., Tumasyan, A. R., Adam, Wolfgang, Asilar, Ece, Bergauer, Thomas, Md. Ali, Mohd. Adli
• Format: Article
• Language: English; English
• Published: American Physical Society 2017
• Subjects: Q Science (General); QC Physics
• Online Access: http://irep.iium.edu.my/63027/1/63027_Measurement%20of%20the%20B%C2%B1%20Meson%20Nuclear%20Modification%20Factor%20_article.pdf; http://irep.iium.edu.my/63027/2/63027_Measurement%20of%20the%20B%C2%B1%20Meson%20Nuclear%20Modification%20Factor%20_scopus.pdf; http://irep.iium.edu.my/63027/; https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.119.152301

The differential production cross sections of B� mesons are measured via the exclusive decay channels B� → J=ψK� → μþμ−K� as a function of transverse momentum in pp and Pb-Pb collisions at a centerof-mass energy ffiffiffiffiffiffiffiffi sNN p ¼ 5.02 TeV per nucleon pair with the CMS detector at the LHC. The ppðPb PbÞ data set used for this analysis corresponds to an integrated luminosity of 28.0 pb−1 (351 μb−1). The measurement is performed in the B� meson transverse momentum range of 7 to 50 GeV=c, in the rapidity interval jyj < 2.4. In this kinematic range, a strong suppression of the production cross section by about a factor of 2 is observed in the Pb-Pb system in comparison to the expectation from pp reference data. These results are found to be roughly compatible with theoretical calculations incorporating beauty quark diffusion and energy loss in a quark-gluon plasma.