7-12 June 2021
Zoom
Europe/Paris timezone

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

Jun 10, 2021, 6:45 PM
1h
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Experimental poster Flavour physics Poster Session

Speaker

Manuel Alejandro Rodriguez Giraldo (Universidad de Antioquia (CO))

Description

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 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) → Bcπ+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.

Primary authors

Manuel Alejandro Rodriguez Giraldo (Universidad de Antioquia (CO)) Jhovanny Andres Mejia Guisao (Universidad de Antioquia (CO))

Presentation materials