Measurement of &lt;em&gt;B&lt;sub&gt;c&lt;/sub&gt;&lt;/em&gt;(2&lt;em&gt;S&lt;/em&gt;)&lt;sup&gt;+&lt;/sup&gt; and &lt;em&gt;B&lt;/em&gt;*&lt;em&gt;&lt;sub&gt;c&lt;/sub&gt;&lt;/em&gt;(2&lt;em&gt;S&lt;/em&gt;)&lt;sup&gt;+&lt;/sup&gt; cross section ratios in proton-proton collisions at √&lt;em&gt;s&lt;/em&gt; = 13 TeV

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

doi:10.1103/PhysRevD.102.092007

Measurement of B_c(2S)⁺ and B*_c(2S)⁺ cross section ratios i

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

Citation

Sirunyan, A. M., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Dragicevic, M., … Vetens, W. (2020). Measurement of B_c(2S)⁺ and B*_c(2S)⁺ cross section ratios in proton-proton collisions at √s = 13 TeV. Physical Review D: Particles and fields, 102(9), 092007 (21 pp.). https://doi.org/10.1103/PhysRevD.102.092007

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:35288

The ratios of the B_c(2S)⁺ to B⁺_c, B*_c(2S)⁺ to B⁺_c, and B*_c(2S)⁺ to B_c(2S)⁺ production cross sections are measured in proton-proton collisions at √s = 13 TeV, using a data sample collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 143 fb^-1. The three measurements are made in the B_c⁺ meson phase space region defined by the transverse momentum p_T > 15 GeV and absolute rapidity |y| < 2.4, with the excited B^(*)_c(2S)⁺ states reconstructed through the B^(*)_c⁺π⁺π^-, followed by the B⁺_c → J/ψπ⁺ and J/ψ → μ⁺μ^- decays. The B_c(2S)⁺ to B⁺_c, B^*_c(2S)⁺ to B⁺_c, and B^*_c(2S)⁺ to B_c(2S)⁺ cross section ratios, including the unknown B^(*)_c(2S)⁺ → B^(*)+_cπ⁺π^- branching fractions, are (3.47 ± 0.63(stat) ± 0.33(syst))%, (4.69 ± 0.71(stat) ± 0.56(syst))%, and 1.35 ± 0.32(stat) ± 0.09(syst), respectively. None of these ratios shows a significant dependence on the p_T or |y| of the B⁺_c meson. The normalized dipion invariant mass distributions from the decays B^(*)_c(2S)⁺ → B^(*)+_cπ⁺π^- are also reported.