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

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Aaij, R ORCID: 0000-0003-0533-1952, Abdelmotteleb, ASW ORCID: 0000-0001-7905-0542, Beteta, C Abellan, Abudinén, F ORCID: 0000-0002-6737-3528, Ackernley, T ORCID: 0000-0002-5951-3498, Adeva, B ORCID: 0000-0001-9756-3712, Adinolfi, M ORCID: 0000-0002-1326-1264, Adlarson, P ORCID: 0000-0001-6280-3851, Agapopoulou, C ORCID: 0000-0002-2368-0147, Aidala, CA ORCID: 0000-0001-9540-4988 et al (show 1092 more authors) (2024) 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 The European Physical Journal C, 84 (6). 575-. ISSN 1434-6044, 1434-6052

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Official URL: https://doi.org/10.1140/epjc/s10052-024-12752-3

Abstract

AbstractThe decays $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^{(*)0}{{K} ^-} $$ $Λ_{b}^{0} \to Λ_{c}^{+} \bar{D}^{(*) 0} K^{-}$ and $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^{*-}_{s}} $$ $Λ_{b}^{0} \to Λ_{c}^{+} D_{s}^{* -}$ are observed for the first time, in proton-proton collision data at $$\sqrt{s} =13\text {Te\hspace{-1.00006pt}V} $$ $\sqrt{s} = 13 Te V$ , corresponding to an integrated luminosity of 5.4$$\text {fb} ^{-1}$$ ${fb}^{- 1}$ collected with the LHCb detector. Their ratios of branching fractions with respect to the $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^-_{s}} $$ $Λ_{b}^{0} \to Λ_{c}^{+} D_{s}^{-}$ mode are measured to be $$\begin{aligned} \begin{aligned} \frac{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^0} {{K} ^-} \right) }{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^-_{s}} \right) }&= 0.1908 {}_{-0.0034}^{+0.0036} {}_{-0.0018}^{+0.0016} \pm 0.0038,\\ \frac{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^{*0}} {{K} ^-} \right) }{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^-_{s}} \right) }&= 0.589 {}_{-0.017}^{+0.018} {}_{-0.018}^{+0.017} \pm 0.012,\\ \frac{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^{*-}_{s}} \right) }{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^-_{s}} \right) }&= 1.668 \pm 0.022 {}_{-0.055}^{+0.061}, \end{aligned} \end{aligned}$$ $\begin{matrix} \begin{matrix} \frac{B (Λ_{b}^{0} \to Λ_{c}^{+} \bar{D}^{0} K^{-})}{B (Λ_{b}^{0} \to Λ_{c}^{+} D_{s}^{-})} & = 0.1908_{- 0.0034}^{+ 0.0036}_{- 0.0018}^{+ 0.0016} \pm 0.0038, \\ \frac{B (Λ_{b}^{0} \to Λ_{c}^{+} \bar{D}^{* 0} K^{-})}{B (Λ_{b}^{0} \to Λ_{c}^{+} D_{s}^{-})} & = 0.589_{- 0.017}^{+ 0.018}_{- 0.018}^{+ 0.017} \pm 0.012, \\ \frac{B (Λ_{b}^{0} \to Λ_{c}^{+} D_{s}^{* -})}{B (Λ_{b}^{0} \to Λ_{c}^{+} D_{s}^{-})} & = 1.668 \pm 0.022_{- 0.055}^{+ 0.061}, \end{matrix} \end{matrix}$ where the first uncertainties are statistical, the second systematic, and the third, for the $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^{(*)0}{{K} ^-} $$ $Λ_{b}^{0} \to Λ_{c}^{+} \bar{D}^{(*) 0} K^{-}$ decays, are due to the uncertainties on the branching fractions of the $${{D} ^-_{s}} \!\rightarrow {{K} ^-} {{K} ^+} {{\pi } ^-} $$ $D_{s}^{-} \to K^{-} K^{+} π^{-}$ and $${{\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^0} \!\rightarrow {{K} ^+} {{\pi } ^-} $$ $\bar{D}^{0} \to K^{+} π^{-}$ decay modes. The measured branching fractions probe factorization assumptions in effective theories and provide the normalization for future pentaquark searches in $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^{(*)0}{{K} ^-} $$ $Λ_{b}^{0} \to Λ_{c}^{+} \bar{D}^{(*) 0} K^{-}$ decay channels.

Item Type:	Article
Uncontrolled Keywords:	5107 Particle and High Energy Physics, 51 Physical Sciences, Down Syndrome, Brain Disorders, Intellectual and Developmental Disabilities (IDD)
Depositing User:	Symplectic Admin
Date Deposited:	01 Jul 2024 09:27
Last Modified:	12 Dec 2025 19:09
DOI:	10.1140/epjc/s10052-024-12752-3
Open Access URL:	https://link.springer.com/content/pdf/10.1140/epjc...
Related Websites:	Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3182442
Disclaimer:	The University of Liverpool is not responsible for content contained on other websites from links within repository metadata. Please contact us if you notice anything that appears incorrect or inappropriate.

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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

Abstract