The first observation of the decay Ξ−𝑏→𝜓⁡(2⁢𝑆)⁢Ξ− and measurement of the branching ratio of Ξ−𝑏→𝜓⁡(2⁢𝑆)⁢Ξ− to Ξ−𝑏→𝐽/𝜓⁢Ξ− are presented. The 𝐽/𝜓 and 𝜓⁡(2⁢𝑆) mesons are reconstructed using their dimuon decay modes. The results are based on proton-proton colliding beam data from the LHC collected by the CMS experiment at √𝑠=13  TeV in 2016–2018, corresponding to an integrated luminosity of 140  fb−1. The branching fraction ratio is measured to be ℬ⁡(Ξ−𝑏→𝜓⁡(2⁢𝑆)⁢Ξ−)/ℬ⁡(Ξ−𝑏→𝐽/𝜓⁢Ξ−)=0.8⁢4+0.21−0.19⁢(stat)±0.10⁢(syst)±0.02⁢(ℬ), where the last uncertainty comes from the uncertainties in the branching fractions of the charmonium states. New measurements of the Ξ𝑏⁢(5945)0 baryon mass and natural width are also presented, using the Ξ−𝑏⁢𝜋+ final state, where the Ξ−𝑏 baryon is reconstructed through the decays 𝐽/𝜓⁢Ξ−, 𝜓⁡(2⁢𝑆)⁢Ξ−, 𝐽/𝜓⁢Λ⁢𝐾−, and 𝐽/𝜓⁢Σ0⁢𝐾−. Finally, the fraction of Ξ−𝑏 baryons produced from Ξ𝑏⁢(5945)0 decays is determined.

Observation of the Csi^-_b -> psi(2s)Csi^- decay and studies of the Csi_b(5945)^0 barion in proton-proton collisions at sqrt(s) = 13 TeV / Hayrapetyan, A., Tumasyan, A., Adam, W., Andrejkovic, J. W., Bergauer, T., Chatterjee, S., Damanakis, K., Dragicevic, M., Hussain, P. S., Jeitler, M., Krammer, N., Li, A., Liko, D., Mikulec, I., Schieck, J., Schöfbeck, R., Schwarz, D., Sonawane, M., Templ, S., Waltenberger, W., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - ELETTRONICO. - 110:(2024), pp. 012002.0-012002.0. [10.1103/physrevd.110.012002]

Observation of the Csi^-_b -> psi(2s)Csi^- decay and studies of the Csi_b(5945)^0 barion in proton-proton collisions at sqrt(s) = 13 TeV

Bardelli, G.;Camaiani, B.;Ceccarelli, R.;Ciulli, V.;D'Alessandro, R.;Focardi, E.;Latino, G.;Lenzi, P.;Lizzo, M.;Papanastassiou, A.;
2024

Abstract

The first observation of the decay Ξ−𝑏→𝜓⁡(2⁢𝑆)⁢Ξ− and measurement of the branching ratio of Ξ−𝑏→𝜓⁡(2⁢𝑆)⁢Ξ− to Ξ−𝑏→𝐽/𝜓⁢Ξ− are presented. The 𝐽/𝜓 and 𝜓⁡(2⁢𝑆) mesons are reconstructed using their dimuon decay modes. The results are based on proton-proton colliding beam data from the LHC collected by the CMS experiment at √𝑠=13  TeV in 2016–2018, corresponding to an integrated luminosity of 140  fb−1. The branching fraction ratio is measured to be ℬ⁡(Ξ−𝑏→𝜓⁡(2⁢𝑆)⁢Ξ−)/ℬ⁡(Ξ−𝑏→𝐽/𝜓⁢Ξ−)=0.8⁢4+0.21−0.19⁢(stat)±0.10⁢(syst)±0.02⁢(ℬ), where the last uncertainty comes from the uncertainties in the branching fractions of the charmonium states. New measurements of the Ξ𝑏⁢(5945)0 baryon mass and natural width are also presented, using the Ξ−𝑏⁢𝜋+ final state, where the Ξ−𝑏 baryon is reconstructed through the decays 𝐽/𝜓⁢Ξ−, 𝜓⁡(2⁢𝑆)⁢Ξ−, 𝐽/𝜓⁢Λ⁢𝐾−, and 𝐽/𝜓⁢Σ0⁢𝐾−. Finally, the fraction of Ξ−𝑏 baryons produced from Ξ𝑏⁢(5945)0 decays is determined.
2024
110
0
0
Hayrapetyan, A.; Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Bergauer, T.; Chatterjee, S.; Damanakis, K.; Dragicevic, M.; Hussain, P. S.; Jeitler, M.;...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1401459
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