Bottom quark energy loss and hadronization with B+ and $$ {textrm{B}}_{textrm{s}}^0 $$ nuclear modification factors using pp and PbPb collisions at $$ sqrt{s_{textrm{NN}}} $$ = 5.02 TeV
Journal Article
Overview
abstract
Abstract; ; The production cross sections of ; ; $$ {textrm{B}}_{textrm{s}}^0 $$; ; ; B; 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 ; ; $$ {textrm{B}}_{textrm{s}}^0 $$; ; ; B; s; 0; ; ; ; ; → J/ψ(μ; +; μ; ; −; )ϕ(1020)(K+K; −; ) and B+; → J/ψ(μ; +; μ; ; −; )K+ decay channels. Results are presented in the transverse momentum (p; T) range 7–50 GeV/c and the rapidity interval -y- < 2.4 for the B mesons. The measured p; T-differential cross sections of B+ and ; ; $$ {textrm{B}}_{textrm{s}}^0 $$; ; ; B; 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; AA, of the B mesons are determined. For p; T; > 10 GeV/c, both mesons are found to be suppressed in PbPb collisions (with R; AA values significantly below unity), with less suppression observed for the ; ; $$ {textrm{B}}_{textrm{s}}^0 $$; ; ; B; s; 0; ; ; ; mesons. In this p; T range, the R; AA values for the B+ mesons are consistent with those for inclusive charged hadrons and D0 mesons. Below 10 GeV/c, both B+ and ; ; $$ {textrm{B}}_{textrm{s}}^0 $$; ; ; B; s; 0; ; ; ; are found to be less suppressed than either inclusive charged hadrons or D0 mesons, with the ; ; $$ {textrm{B}}_{textrm{s}}^0 $$; ; ; B; s; 0; ; ; ; ; R; AA value consistent with unity. The R; AA values found for the B+ and ; ; $$ {textrm{B}}_{textrm{s}}^0 $$; ; ; B; 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.
