The production cross sections of Bs0 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 Bs0→ J/ψ(μ+μ−)ϕ(1020)(K+K−) and B+→ J/ψ(μ+μ−)K+ decay channels. Results are presented in the transverse momentum (pT) range 7–50 GeV/c and the rapidity interval |y| < 2.4 for the B mesons. The measured pT-differential cross sections of B+ and Bs0 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 pT> 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 Bs0 mesons. In this pT 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 Bs0 are found to be less suppressed than either inclusive charged hadrons or D0 mesons, with the Bs0 R_AA value consistent with unity. The R_AA values found for the B+ and Bs0 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.
Bottom quark energy loss and hadronization with B+ and B_s^0 nuclear modification factors using pp and PbPb collisions at √s_NN = 5.02 TeV
Tornago, M.;Cappati, A.;Amapane, N.;Argiro, S.;Bellan, R.;Bellora, A.;Borca, C.;Costa, M.;Covarelli, R.;Grippo, M.;Kiani, B.;Luongo, F.;Markovic, L.;Mecca, A.;Menzio, L.;Meridiani, P.;Migliore, E.;Mulargia, R.;Obertino, M. M.;Pacher, L.;Siviero, F.;Sola, V.;Solano, A.;Tarricone, C.;Umoret, G.;Shchelina, K.;Rumerio, P.;Ravera, F.;Salvatico, R.;Vagnerini, A.;
2025-01-01
Abstract
The production cross sections of Bs0 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 Bs0→ J/ψ(μ+μ−)ϕ(1020)(K+K−) and B+→ J/ψ(μ+μ−)K+ decay channels. Results are presented in the transverse momentum (pT) range 7–50 GeV/c and the rapidity interval |y| < 2.4 for the B mesons. The measured pT-differential cross sections of B+ and Bs0 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 pT> 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 Bs0 mesons. In this pT 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 Bs0 are found to be less suppressed than either inclusive charged hadrons or D0 mesons, with the Bs0 R_AA value consistent with unity. The R_AA values found for the B+ and Bs0 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.| File | Dimensione | Formato | |
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