Bottom quark energy loss and hadronization with B${}^{+}$ and B${}_{\mathrm{s}}^0$ nuclear modification factors using pp and PbPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

Abstract

The production cross sections of B${}_{\mathrm{s}}^0$ and B${}^{+}$ mesons are reported in proton-proton (pp) collisions recorded by the CMS experiment at the CERN LHC with a center-of-mass energy of 5.02 TeV. The data sample corresponds to an integrated luminosity of 302 pb${}^{-1}$. The cross sections are based on measurements of the B${}_{\mathrm{s}}^0$ $\to$ J/$\psi ({\mu }^{+}{\mu }^{-})\varphi$(1020) (K${}^{+}$K${}^{-}$) and B${}^{+}$ $\to$ J/$\psi ({\mu }^{+}{\mu }^{-})$K${}^{+}$ decay channels. Results are presented in the transverse momentum ($p_{\mathrm{T}}$) range 7-50 GeV/$c$ and the rapidity interval $|y|$ $<$ 2.4 for the B mesons. The measured $p_{\mathrm{T}}$-differential cross sections of B${}^{+}$ and B${}_{\mathrm{s}}^0$ in pp collisions are well described by fixed-order plus next-to-leading logarithm perturbative quantum chromodynamics calculations. Using previous PbPb collision measurements at the same nucleon-nucleon center-of-mass energy, the nuclear modification factors, $R_{\mathrm{AA}}$, of the B mesons are determined. For $p_{\mathrm{T}}$ $<$ 10 GeV/$c$, both mesons are found to be suppressed in PbPb collisions (with $R_{\mathrm{AA}}$ values significantly below unity), with less suppression observed for the B${}_{\mathrm{s}}^0$ mesons. In this $p_{\mathrm{T}}$ range, the $R_{\mathrm{AA}}$ values for the B${}^{+}$ mesons are consistent with those for inclusive charged hadrons and D${}^0$ mesons. Below 10 GeV/$c$, both B${}^{+}$ and B${}_{\mathrm{s}}^0$ are found to be less suppressed than either inclusive charged hadrons or D${}^0$ mesons, with the B${}_{\mathrm{s}}^0$ $R_{\mathrm{AA}}$ value consistent with unity. The $R_{\mathrm{AA}}$ values found for the B${}^{+}$ and B${}_{\mathrm{s}}^0$ are compared to theoretical calculations, providing constraints on the mechanism of bottom quark energy loss and hadronization in the quark-gluon plasma, the hot and dense matter created in ultrarelativistic heavy ion collisions.

arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-21-014 (CMS Public Pages)

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