The first observation of the decay $\Xi_b^- \to \psi(2S) \Xi^-$ and measurement of the branching ratio of $\Xi_b^- \to \psi(2S) \Xi^-$ to $\Xi_b^- \to J/\psi \Xi^-$ are presented. The $J/\psi$ and $\psi(2S)$ 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 $\sqrt{s} = 13 \, \text{TeV}$ in 2016--2018, corresponding to an integrated luminosity of $140 \, \text{fb}^{-1}$. The branching fraction ratio is measured to be $\mathcal{B}(\Xi_b^- \to \psi(2S) \Xi^-) / \mathcal{B}(\Xi_b^- \to J/\psi \Xi^-) = 0.84^{+0.21}_{-0.19} \, \text{(stat)} \pm 0.10 \, \text{(syst)} \pm 0.02 (\mathcal{B})$, where the last uncertainty comes from the uncertainties in the branching fractions of the charmonium states. New measurements of the $\Xi_b(5945)^0$ baryon mass and natural width are also presented, using the $\Xi_b^-\pi^+$ final state, where the $\Xi_b^-$ baryon is reconstructed through the decays $J/\psi \Xi^-$, $\psi(2S) \Xi^-$, $J/\psi \Lambda K^-$, and $J/\psi \Sigma^0 K^-$. Finally, the fraction of $\Xi_b^-$ baryons produced from $\Xi_b(5945)^0$ decays is determined.

Observation of the Ξ−b → ψð2SÞΞ− decay and studies of the Ξbð5945Þ0 baryon in proton-proton collisions at √s p = 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. - 110:1(2024), pp. 1-27. [10.1103/physrevd.110.012002]

Observation of the Ξ−b → ψð2SÞΞ− decay and studies of the Ξbð5945Þ0 baryon in proton-proton collisions at √s p = 13 TeV

Baldenegro Barrera, C.;Basile, C.;Cunqueiro Mendez, L.;Del Re, D.;Mijuskovic, J.;Paramatti, R.;Quaranta, C.;Rahatlou, S.;Santanastasio, F.;
2024

Abstract

The first observation of the decay $\Xi_b^- \to \psi(2S) \Xi^-$ and measurement of the branching ratio of $\Xi_b^- \to \psi(2S) \Xi^-$ to $\Xi_b^- \to J/\psi \Xi^-$ are presented. The $J/\psi$ and $\psi(2S)$ 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 $\sqrt{s} = 13 \, \text{TeV}$ in 2016--2018, corresponding to an integrated luminosity of $140 \, \text{fb}^{-1}$. The branching fraction ratio is measured to be $\mathcal{B}(\Xi_b^- \to \psi(2S) \Xi^-) / \mathcal{B}(\Xi_b^- \to J/\psi \Xi^-) = 0.84^{+0.21}_{-0.19} \, \text{(stat)} \pm 0.10 \, \text{(syst)} \pm 0.02 (\mathcal{B})$, where the last uncertainty comes from the uncertainties in the branching fractions of the charmonium states. New measurements of the $\Xi_b(5945)^0$ baryon mass and natural width are also presented, using the $\Xi_b^-\pi^+$ final state, where the $\Xi_b^-$ baryon is reconstructed through the decays $J/\psi \Xi^-$, $\psi(2S) \Xi^-$, $J/\psi \Lambda K^-$, and $J/\psi \Sigma^0 K^-$. Finally, the fraction of $\Xi_b^-$ baryons produced from $\Xi_b(5945)^0$ decays is determined.
2024
cms; lhc; Bphysics;
01 Pubblicazione su rivista::01a Articolo in rivista
Observation of the Ξ−b → ψð2SÞΞ− decay and studies of the Ξbð5945Þ0 baryon in proton-proton collisions at √s p = 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. - 110:1(2024), pp. 1-27. [10.1103/physrevd.110.012002]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1719769
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