Speaker
Description
The transverse momentum spectra of $D^0$ mesons from b hadron decays are measured in pp and PbPb collisions at a nucleon-nucleon center of mass energy of 5.02 TeV with the CMS detector at the LHC. The measurement is performed in the $D^0$ $p_T$ range of 2–100 GeV /c and in the rapidity range of |y| < 1. The $D^0$ mesons from b hadron decays are distinguished from prompt $D^0$ mesons by their decay topologies. In PbPb collisions, the $B \rightarrow D^0$ yield is found to be suppressed in most of the measured $p_T$ range 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 $B \rightarrow D^0$ 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.
