The ratios of the Bc(2S)+ to Bc+, Bc∗(2S)+ to Bc+, and Bc∗(2S)+ to Bc(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 Bc+ meson phase space region defined by the transverse momentum pT>15 GeV and absolute rapidity |y|<2.4, with the excited Bc(∗)(2S)+ states reconstructed through the Bc(∗)+π+π-, followed by the Bc+→J/ψπ+ and J/ψ→μ+μ- decays. The Bc(2S)+ to Bc+, Bc∗(2S)+ to Bc+, and Bc∗(2S)+ to Bc(2S)+ cross section ratios, including the unknown Bc(∗)(2S)+→Bc(∗)+π+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 pT or |y| of the Bc+ meson. The normalized dipion invariant mass distributions from the decays Bc(∗)(2S)+→Bc(∗)+π+π- are also reported.

Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Dragicevic, M., et al. (2020). Measurement of Bc(2S)+ and Bc*(2S)+ cross section ratios in proton-proton collisions at s=13  TeV. PHYSICAL REVIEW D, 102(9) [10.1103/PhysRevD.102.092007].

Measurement of Bc(2S)+ and Bc*(2S)+ cross section ratios in proton-proton collisions at s=13  TeV

Benaglia, A.;Beschi, A.;Brivio, F.;Cetorelli, F.;Ciriolo, V.;De Guio, F.;Dinardo, M.  E.;Ghezzi, A.;Govoni, P.;Guzzi, L.;Malberti, M.;Monti, F.;Moroni, L.;Paganoni, M.;Ragazzi, S.;Tabarelli de Fatis, T.;Valsecchi, D.;Zuolo, D.;Lucchini, M.  T.;
2020

Abstract

The ratios of the Bc(2S)+ to Bc+, Bc∗(2S)+ to Bc+, and Bc∗(2S)+ to Bc(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 Bc+ meson phase space region defined by the transverse momentum pT>15 GeV and absolute rapidity |y|<2.4, with the excited Bc(∗)(2S)+ states reconstructed through the Bc(∗)+π+π-, followed by the Bc+→J/ψπ+ and J/ψ→μ+μ- decays. The Bc(2S)+ to Bc+, Bc∗(2S)+ to Bc+, and Bc∗(2S)+ to Bc(2S)+ cross section ratios, including the unknown Bc(∗)(2S)+→Bc(∗)+π+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 pT or |y| of the Bc+ meson. The normalized dipion invariant mass distributions from the decays Bc(∗)(2S)+→Bc(∗)+π+π- are also reported.
Articolo in rivista - Articolo scientifico
Physics - LHC - CMS - b quark
English
2020
102
9
092007
none
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Dragicevic, M., et al. (2020). Measurement of Bc(2S)+ and Bc*(2S)+ cross section ratios in proton-proton collisions at s=13  TeV. PHYSICAL REVIEW D, 102(9) [10.1103/PhysRevD.102.092007].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/297223
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