The decays Λ0 b → Λ+ c D(∗)0 K− and Λ0 b → Λ+ c D∗− s are observed for the first time, in proton-proton collision data at √s = 13TeV, corresponding to an integrated luminosity of 5.4fb−1 collected with the LHCb detector. Their ratios of branching fractions with respect to the Λ0 b → Λ+ c D− s mode are measured to be B Λ0 b → Λ+ c D0 K− B Λ0 b → Λ+ c D− s B Λ0 b → Λ+ c D∗0 K− = 0.1908+0.0036 +0.0016 −0.0034 −0.0018 ± 0.0038, = 0.589+0.018 +0.017 −0.017 −0.018 ± 0.012, = 1.668 ± 0.022+0.061 −0.055, B Λ0 b → Λ+ c D− s B Λ0 b → Λ+ c D∗− s B Λ0 b → Λ+ c D− s where the first uncertainties are statistical, the second sys- tematic, and the third, for the Λ0 b → Λ+ c D(∗)0 K− decays, are due to the uncertainties on the branching fractions of the D− s → K−K +π− and D0 → K +π− decay modes. The measured branching fractions probe factorization assump- tions in effective theories and provide the normalization for future pentaquark searches in Λ0 b → Λ+ c D(∗)0 K− decay channels.

Observation of $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^{(*)0}{{K} ^-} $$ and $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^{*-}_{s}} $$ decays / Null, N., Aaij, R., Abdelmotteleb, A.S.W., Beteta, C.A., Abudinén, F., Ackernley, T., Adeva, B., Adinolfi, M., Adlarson, P., Agapopoulou, C., Aidala, C.A., Ajaltouni, Z., Akar, S., Akiba, K., Albicocco, P., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., et al.. - In: EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6052. - 84:6(2024). [10.1140/epjc/s10052-024-12752-3]

Observation of $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^{(*)0}{{K} ^-} $$ and $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^{*-}_{s}} $$ decays

Casse, G.;Sarti, A.;
2024

Abstract

The decays Λ0 b → Λ+ c D(∗)0 K− and Λ0 b → Λ+ c D∗− s are observed for the first time, in proton-proton collision data at √s = 13TeV, corresponding to an integrated luminosity of 5.4fb−1 collected with the LHCb detector. Their ratios of branching fractions with respect to the Λ0 b → Λ+ c D− s mode are measured to be B Λ0 b → Λ+ c D0 K− B Λ0 b → Λ+ c D− s B Λ0 b → Λ+ c D∗0 K− = 0.1908+0.0036 +0.0016 −0.0034 −0.0018 ± 0.0038, = 0.589+0.018 +0.017 −0.017 −0.018 ± 0.012, = 1.668 ± 0.022+0.061 −0.055, B Λ0 b → Λ+ c D− s B Λ0 b → Λ+ c D∗− s B Λ0 b → Λ+ c D− s where the first uncertainties are statistical, the second sys- tematic, and the third, for the Λ0 b → Λ+ c D(∗)0 K− decays, are due to the uncertainties on the branching fractions of the D− s → K−K +π− and D0 → K +π− decay modes. The measured branching fractions probe factorization assump- tions in effective theories and provide the normalization for future pentaquark searches in Λ0 b → Λ+ c D(∗)0 K− decay channels.
2024
Hadron-Hadron Scattering, Particle and Resonance Production, Quarkonium, Relativistic Heavy Ion Physics
01 Pubblicazione su rivista::01a Articolo in rivista
Observation of $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^{(*)0}{{K} ^-} $$ and $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^{*-}_{s}} $$ decays / Null, N., Aaij, R., Abdelmotteleb, A.S.W., Beteta, C.A., Abudinén, F., Ackernley, T., Adeva, B., Adinolfi, M., Adlarson, P., Agapopoulou, C., Aidala, C.A., Ajaltouni, Z., Akar, S., Akiba, K., Albicocco, P., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., et al.. - In: EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6052. - 84:6(2024). [10.1140/epjc/s10052-024-12752-3]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1720400
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