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

Aaij, Roel; Abdelmotteleb, Ahmed Sameh Wagih; Abellan Beteta, Carlos; Abudinén, Fernando Jesus; Ackernley, Thomas; Adeva, Bernardo; Adinolfi, Marco; Adlarson, Patrik Harri; Agapopoulou, Christina; Aidala, Christine Angela

doi: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

LHCb

Collaboration

Nov 23, 2023

24 pages

Published in:

Eur.Phys.J.C 84 (2024) 6, 575,
Eur.Phys.J.C 84 (2024) 575

Published: Jun 5, 2024

e-Print:

2311.14088 [hep-ex]

DOI:

10.1140/epjc/s10052-024-12752-3

Report number:

CERN-EP-2023-244,
LHCb-PAPER-2023-034

Experiments:

CERN-LHC-LHCb

View in:

reference search5 citations

Citations per year

Abstract: (Springer)

The decays

{{\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}}

are observed for the first time, in proton-proton collision data at

\sqrt{s} =13\text {Te\hspace{-1.00006pt}V}

, corresponding to an integrated luminosity of 5.4

\text {fb} ^{-1}

collected with the LHCb detector. Their ratios of branching fractions with respect to the

{{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{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}

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} ^-}

decays, are due to the uncertainties on the branching fractions of the

{{D} ^-_{s}} \!\rightarrow {{K} ^-} {{K} ^+} {{\pi } ^-}

and

{{\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^0} \!\rightarrow {{K} ^+} {{\pi } ^-}

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} ^-}

decay channels.

Note:

All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2023-034.html (LHCb public pages); v2 after journal review

p p: colliding beams
Lambda/b0: hadronic decay
Lambda/c+
D*(2010)
D/s*(2110)
D0
K-
Lambda/b0: branching ratio
branching ratio: ratio: measured
branching ratio: measured

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