# Studies of Beauty Suppression via Nonprompt ${D}^{0}$ Mesons in Pb-Pb Collisions at $\sqrt{{s}_{\mathrm{NN}}}=5.02\text{}\text{}\mathrm{TeV}$

10 July 2019

Abstract: The transverse momentum spectra of ${D}^{0}$ 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 ${D}^{0}$ mesons from $b$ hadron decays are distinguished from prompt ${D}^{0}$ mesons by their decay topologies. In Pb-Pb collisions, the $B\to {D}^{0}$ yield is found to be suppressed in the measured ${p}_{T}$ range from 2 to $100\text{}\text{}\mathrm{GeV}/c$ as compared to $pp$ collisions. The suppression is weaker than that of prompt ${D}^{0}$ mesons and charged hadrons for ${p}_{T}$ around $10\text{}\text{}\mathrm{GeV}/c$. While theoretical calculations incorporating partonic energy loss in the quark-gluon plasma can successfully describe the measured $B\to {D}^{0}$ suppression at higher ${p}_{T}$, the data show an indication of larger suppression than the model predictions in the range of $2<{p}_{T}<5\text{}\text{}\mathrm{GeV}/c$.

Published in: Physical Review Letters 123 (2019)