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Volume 345 - International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (HardProbes2018) - Heavy Flavours & Quarkonia
Studies of beauty suppression via nonprompt $D^0$ mesons in PbPb collisions at 5.02 TeV withthe CMS detector
H. Qiu* on behalf of the CMS collaboration
*corresponding author
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Pre-published on: 2019 January 11
Published on: 2019 April 24
The transverse momentum spectra of $D^0$ mesons from b hadron decays are measured at midrapidity ($|y|<1$) 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 $D^0$ mesons from b hadron decays are distinguished from prompt $D^0$ mesons by their decay topologies. In PbPb collisions, the $B \to D^{0}$ 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 $B \to D^{0}$ suppression at higher $p_T$, the data show an indication of larger suppression than the model predictions in the range of $2<p_{T}<5$ GeV/$c$.
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