Bottom quark energy loss and hadronization with B$^+$ and B$^0_\mathrm{s}$ nuclear modification factors using pp and \PbPb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV
{"title":"Bottom quark energy loss and hadronization with B$^+$ and B$^0_\\mathrm{s}$ nuclear modification factors using pp and \\PbPb collisions at $\\sqrt{s_\\mathrm{NN}}$ = 5.02 TeV","authors":"CMS Collaboration","doi":"arxiv-2409.07258","DOIUrl":null,"url":null,"abstract":"The production cross sections of B$^0_\\mathrm{s}$ and B$^+$ mesons are\nreported in proton-proton (pp) collisions recorded by the CMS experiment at the\nCERN LHC with a center-of-mass energy of 5.02 TeV. The data sample corresponds\nto an integrated luminosity of 302 pb$^{-1}$. The cross sections are based on\nmeasurements of the B$^0_\\mathrm{s}$ $\\to$\nJ/$\\psi(\\mu^+\\mu^-)\\phi$(1020)(K$^+$K$^-$) and B$^+$ $\\to$\nJ/$\\psi(\\mu^+\\mu^-)$K$^+$ decay channels. Results are presented in the\ntransverse momentum ($p_\\mathrm{T}$) range 7-50 GeV/$c$ and the rapidity\ninterval $\\lvert y \\rvert$ $\\lt$ 2.4 for the B mesons. The measured\n$p_\\mathrm{T}$-differential cross sections of B$^+$ and B$^0_\\mathrm{s}$ in pp\ncollisions are well described by fixed-order plus next-to-leading logarithm\nperturbative quantum chromodynamics calculations. Using previous PbPb collision\nmeasurements at the same nucleon-nucleon center-of-mass energy, the nuclear\nmodification factors, $R_\\mathrm{AA}$, of the B mesons are determined. For\n$p_\\mathrm{T}$ $\\lt$ 10 GeV/$c$, both mesons are found to be suppressed in PbPb\ncollisions (with $R_\\mathrm{AA}$ values significantly below unity), with less\nsuppression observed for the B$^0_\\mathrm{s}$ mesons. In this $p_\\mathrm{T}$\nrange, the $R_\\mathrm{AA}$ values for the B$^+$ mesons are consistent with\nthose for inclusive charged hadrons and D$^0$ mesons. Below 10 GeV/$c$, both\nB$^+$ and B$^0_\\mathrm{s}$s are found to be less suppressed than either\ninclusive charged hadrons or D$^0$ mesons, with the B$^0_\\mathrm{s}$\n$R_\\mathrm{AA}$ value consistent with unity. The $R_\\mathrm{AA}$ values found\nfor the B$^+$ and B$^0_\\mathrm{s}$ are compared to theoretical calculations,\nproviding constraints on the mechanism of bottom quark energy loss and\nhadronization in the quark-gluon plasma, the hot and dense matter created in\nultrarelativistic heavy ion collisions.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":"273 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv - PHYS - Nuclear Experiment","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/arxiv-2409.07258","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
The production cross sections of B$^0_\mathrm{s}$ 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$^0_\mathrm{s}$ $\to$
J/$\psi(\mu^+\mu^-)\phi$(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 $\lvert y \rvert$ $\lt$ 2.4 for the B mesons. The measured
$p_\mathrm{T}$-differential cross sections of B$^+$ and B$^0_\mathrm{s}$ 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
$p_\mathrm{T}$ $\lt$ 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$^0_\mathrm{s}$ 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$^0_\mathrm{s}$s are found to be less suppressed than either
inclusive charged hadrons or D$^0$ mesons, with the B$^0_\mathrm{s}$
$R_\mathrm{AA}$ value consistent with unity. The $R_\mathrm{AA}$ values found
for the B$^+$ and B$^0_\mathrm{s}$ 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.