Studies of Beauty Suppression via Nonprompt D⁰ Mesons in Pb-Pb Collisions at √^SNN =5.02 TeV

Authors

A. M. Sirunyan, CMS Collaboration

Date of this Version

7-9-2019

Citation

PHYSICAL REVIEW LETTERS 123, 022001 (2019). DOI: 10.1103/PhysRevLett.123.022001

Comments

Used by permission

Abstract

The transverse momentum spectra of D⁰ mesons from b hadron decays are measured at midrapidity (|y| < 1) in pp and Pb-Pb collisions at a nucleon-nucleon center of mass energy of 5.02 TeV with the CMS detector at the LHC. The D0 mesons from b hadron decays are distinguished from prompt D⁰ mesons by their decay topologies. In Pb-Pb collisions, the B → D⁰ yield is found to be suppressed in the measured p_T range from 2 to 100 GeV=c as compared to pp collisions. The suppression is weaker than that of prompt D⁰ mesons and charged hadrons for p_T around 10 GeV=c. While theoretical calculations incorporating partonic energy loss in the quark-gluon plasma can successfully describe the measured B → D⁰ suppression at higher p_T, the data show an indication of larger suppression than the model predictions in the range of 2 < p_T < 5 GeV/c.