The decays Λb0 → Λc+ anti-D(*)0 K− and Λb0 → Λc+ Ds*− are observed for the first time, in proton-proton collision data at √s = 13 TeV corresponding to an integrated luminosity of 5.4 fb^−1 collected with the LHCb detector. Their ratios of branching fractions with respect to the Λb0 → Λc+ Ds− mode are measured to be B(Λb0 → Λc+ anti-D0 K−)/B(Λb0 → Λc+ Ds−) = 0.1908{−0.0034}{+0.0036}{−0.0018}{+0.0016} ± 0.0038, B(Λb0 → Λc+ anti-D*0 K−)/B(Λb0 → Λc+ Ds−) = 0.589{−0.017}{+0.018}{−0.018}{+0.017} ± 0.012, B(Λb0 → Λc+ Ds*−)/B(Λb0 → Λc+ Ds−) = 1.668 ± 0.022{−0.055}{+0.061}, where the first uncertainties are statistical, the second systematic, and the third, for the Λb0 → Λc+ anti-D(*)0 K− decays, are due to the uncertainties on the branching fractions of the Ds− → K− K+ π− and anti-D0 → K+ π− decay modes. The measured branching fractions probe factorization assumptions in effective theories and provide the normalization for future pentaquark searches in Λb0 → Λc+ anti-D(*)0 K− decay channels.

Aaij, R., Abdelmotteleb, A.S.W., Beteta, C.A., Abudinén, F., Ackernley, T., Adeva, B., et al. (2024). Observation of Λb0 → Λc+ anti-D(*)0 K− and Λb0 → Λc+ Ds*− decays. EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 84(6), 1-18 [10.1140/epjc/s10052-024-12752-3].

Observation of Λb0 → Λc+ anti-D(*)0 K− and Λb0 → Λc+ Ds*− decays

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Villa, A.;
2024

Abstract

The decays Λb0 → Λc+ anti-D(*)0 K− and Λb0 → Λc+ Ds*− are observed for the first time, in proton-proton collision data at √s = 13 TeV corresponding to an integrated luminosity of 5.4 fb^−1 collected with the LHCb detector. Their ratios of branching fractions with respect to the Λb0 → Λc+ Ds− mode are measured to be B(Λb0 → Λc+ anti-D0 K−)/B(Λb0 → Λc+ Ds−) = 0.1908{−0.0034}{+0.0036}{−0.0018}{+0.0016} ± 0.0038, B(Λb0 → Λc+ anti-D*0 K−)/B(Λb0 → Λc+ Ds−) = 0.589{−0.017}{+0.018}{−0.018}{+0.017} ± 0.012, B(Λb0 → Λc+ Ds*−)/B(Λb0 → Λc+ Ds−) = 1.668 ± 0.022{−0.055}{+0.061}, where the first uncertainties are statistical, the second systematic, and the third, for the Λb0 → Λc+ anti-D(*)0 K− decays, are due to the uncertainties on the branching fractions of the Ds− → K− K+ π− and anti-D0 → K+ π− decay modes. The measured branching fractions probe factorization assumptions in effective theories and provide the normalization for future pentaquark searches in Λb0 → Λc+ anti-D(*)0 K− decay channels.
2024
Aaij, R., Abdelmotteleb, A.S.W., Beteta, C.A., Abudinén, F., Ackernley, T., Adeva, B., et al. (2024). Observation of Λb0 → Λc+ anti-D(*)0 K− and Λb0 → Λc+ Ds*− decays. EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 84(6), 1-18 [10.1140/epjc/s10052-024-12752-3].
Aaij, R.; Abdelmotteleb, A. S. W.; Beteta, C. Abellan; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapopoulou, C.; Aidala, C....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1005994
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