LARGE TRANSVERSE-MOMENTA; QUARK-GLUON PLASMA; PERSPECTIVE; MATTER
Issue Date
2019-07
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW LETTERS, v. 123, no. 2, article no. 022001
Abstract
The transverse momentum spectra of D-0 mesons from b hadron decays are measured at midrapidity (vertical bar y vertical bar ˂ 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 D-0 mesons from b hadron decays are distinguished from prompt D-0 mesons by their decay topologies. In Pb-Pb collisions, the B -˃ D-0 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 D-0 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 -˃ D-0 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.