Studies of Beauty Suppression via Nonprompt $D^0$ Mesons in Pb-Pb Collisions at $Q^2 = 4$ $\rm GeV^2$

The collaboration
Phys.Rev.Lett. 123 (2019) 022001, 2019.

Abstract
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$/c$.

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Fig. 2 upper panel

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Fig. 2 lower panel

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The $\text {data}/\mathrm {FONLL}$ ratio for the ${{{\mathrm {B}}}\to {\mathrm {D^0}}}$ ${p_{\mathrm {T}}}$ spectra in pp...

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Fig. 3

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The ${{{\mathrm {B}}}\to {\mathrm {D^0}}}$ nuclear modification factor ${R_{\mathrm {AA}}}$ for PbPb collisions at \${\sqrt {\smash...