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Observation of Λb0→Λc+D¯(∗)0K- and Λb0→Λc+Ds∗- decays.

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Title:	Observation of Λb0→Λc+D¯(∗)0K- and Λb0→Λc+Ds∗- decays.
Authors:	LHCb Collaboration (AUTHOR), Aaij, R.¹ (AUTHOR), Abdelmotteleb, A. S. W.² (AUTHOR), Beteta, C. Abellan³ (AUTHOR), Abudinén, F.² (AUTHOR), Ackernley, T.⁴ (AUTHOR), Adeva, B.⁵ (AUTHOR), Adinolfi, M.⁶ (AUTHOR), Adlarson, P.⁷ (AUTHOR), Agapopoulou, C.⁸ (AUTHOR), Aidala, C. A.⁹ (AUTHOR), Ajaltouni, Z.¹⁰ (AUTHOR), Akar, S.¹¹ (AUTHOR), Akiba, K.¹ (AUTHOR), Albicocco, P.¹² (AUTHOR), Albrecht, J.¹³ (AUTHOR), Alessio, F.⁸ (AUTHOR), Alexander, M.¹⁴ (AUTHOR), Alfonso Albero, A.¹⁵ (AUTHOR), Aliouche, Z.¹⁶ (AUTHOR)
Source:	European Physical Journal C -- Particles & Fields. Jun2024, Vol. 84 Issue 6, p1-18. 18p.
Abstract:	The decays Λ b 0 → Λ c + D ¯ (∗) 0 K - and Λ b 0 → Λ c + D s ∗ - are observed for the first time, in proton-proton collision data at s = 13 Te V , corresponding to an integrated luminosity of 5.4 fb - 1 collected with the LHCb detector. Their ratios of branching fractions with respect to the Λ b 0 → Λ c + D s - mode are measured to be B Λ b 0 → Λ c + D ¯ 0 K - B Λ b 0 → Λ c + D s - = 0.1908 - 0.0034 + 0.0036 - 0.0018 + 0.0016 ± 0.0038 , B Λ b 0 → Λ c + D ¯ ∗ 0 K - B Λ b 0 → Λ c + D s - = 0.589 - 0.017 + 0.018 - 0.018 + 0.017 ± 0.012 , B Λ b 0 → Λ c + D s ∗ - B Λ b 0 → Λ c + D s - = 1.668 ± 0.022 - 0.055 + 0.061 , where the first uncertainties are statistical, the second systematic, and the third, for the Λ b 0 → Λ c + D ¯ (∗) 0 K - decays, are due to the uncertainties on the branching fractions of the D s - → K - K + π - and D ¯ 0 → K + π - decay modes. The measured branching fractions probe factorization assumptions in effective theories and provide the normalization for future pentaquark searches in Λ b 0 → Λ c + D ¯ (∗) 0 K - decay channels. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source
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