Studies of beauty suppression via nonprompt D$^0$ mesons in PbPb collisions at $$\sqrt{s_\mathrm{NN}}=$$ 5.02 TeV
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_\mathrm{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_\mathrm{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 $$p_\mathrm{T}$$, the data show an indication of larger suppression than the model predictions in the range of 2$$\lt p_\mathrm{T}\lt$$5 GeV$/c$.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- CMS
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1484193
- Report Number(s):
- FERMILAB-PUB-18-646-CMS; arXiv:1810.11102; CMS-HIN-16-016; CERN-EP-2018-264; 1700575
- Journal Information:
- Phys.Rev.Lett., Journal Name: Phys.Rev.Lett.
- Country of Publication:
- United States
- Language:
- English
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