Observation of B&lt;sub&gt;s&lt;/sub&gt;&lt;sup&gt;0&lt;/sup&gt; mesons and measurement of the B&lt;sub&gt;s&lt;/sub&gt;&lt;sup&gt;0&lt;/sup&gt;/B&lt;sup&gt;+&lt;/sup&gt; yield ratio in PbPb collisions at √&lt;em&gt;s&lt;/em&gt;&lt;sub&gt;NN &lt;/sub&gt;= 5.02 TeV

Tumasyan, A.; Adam, W.; Ambrogi, F.; Bergauer, T.; Dragicevic, M.; Erö, J.; Escalante Del Valle, A.; Frühwirth, R.; Jeitler, M.; Krammer, N.; Caminada, L.; Erdmann, W.; Horisberger, R.; Ingram, Q.; Kaestli, H.C.; Kotlinski, D.; Langenegger, U.; Rohe, T.; Vetens, W.

doi:10.1016/j.physletb.2022.137062

Observation of B_s⁰ mesons and measurement of the B_s⁰/B⁺ yield ratio in PbPb collisions at √s_NN= 5.02 TeV

Tumasyan A, Adam W, Ambrogi F, Bergauer T, Dragicevic M, Erö J, Escalante Del Valle A, Frühwirth R, Jeitler M, Krammer N, Caminada L, Erdmann W, Horisberger R, Ingram Q, Kaestli HC, Kotlinski D, Langenegger U, Rohe T, Vetens W, et al.

Citation

Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Dragicevic, M., Erö, J., … Vetens, W. (2022). Observation of B_s⁰ mesons and measurement of the B_s⁰/B⁺ yield ratio in PbPb collisions at √s_NN= 5.02 TeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 829, 137062 (25 pp.). https://doi.org/10.1016/j.physletb.2022.137062

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:42441

The B_s⁰ and B⁺ production yields are measured in PbPb collisions at a center-of-mass energy per nucleon pair of 5.02 TeV. The data sample, collected with the CMS detector at the LHC, corresponds to an integrated luminosity of 1.7 nb⁻¹. The mesons are reconstructed in the exclusive decay channels B→s0J/ψ(μ⁺μ⁻)ϕ(K⁺K⁻) and B→+J/ψ(μ⁺μ⁻)K⁺, in the transverse momentum range 7–50 GeV/c and absolute rapidity 0–2.4. The B_s⁰ meson is observed with a statistical significance in excess of five standard deviations for the first time in nucleus-nucleus collisions. The measurements are performed as functions of the transverse momentum of the B mesons and of the PbPb collision centrality. The ratio of production yields of B_s⁰ and B⁺ is measured and compared to theoretical models that include quark recombination effects.