Studies of beauty suppression via measurements of nonprompt D0 mesons in PbPb collisions at sqrt(sNN)=5.02 TeV

The transverse momentum spectra of $\mathrm{D^0}$ mesons from b hadron decays are measured in pp and PbPb collisions at a nucleon-nucleon center of mass energy of 5.02 $\mathrm{TeV}$ with the CMS detector at the LHC. The measurement is performed in the $\mathrm{D^0}$ $p_{\rm{T}}$ range of 2--100 ${\rm Ge\hspace{-.08em}V\hspace{-0.16em}}/\hspace{-0.08em}c$ and in the rapidity range of $|\mathrm{y}|<1$. The $\mathrm{D^0}$ mesons from b hadron decays are distinguished from prompt $\mathrm{D^0}$ mesons by their decay topologies. In PbPb collisions, the $\mathrm{B\rightarrow{D^0}}$ yield is found to be suppressed in most of the measured $p_{\rm{T}}$ range compared to pp collisions. The suppression is weaker than that of prompt $\mathrm{D^0}$ mesons and charged hadrons for $p_{\rm{T}}$ around 10 ${\rm Ge\hspace{-.08em}V\hspace{-0.16em}}/\hspace{-0.08em}c$. While theoretical calculations incorporating partonic energy loss in the quark gluon plasma can successfully describe the measured $\mathrm{B\rightarrow{D^0}}$ suppression at higher $p_{\rm{T}}$, the data show an indication of larger suppression than the model predictions in the range of $2 < p_{T} < 5$ ${\rm Ge\hspace{-.08em}V\hspace{-0.16em}}/\hspace{-0.08em}c$.