Observation and branching fraction measurement of the decay <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi mathvariant="normal">Ξ</mml:mi><mml:mi>b</mml:mi><mml:mo>−</mml:mo></mml:msubsup><mml:mo stretchy="false">→</mml:mo><mml:msubsup><mml:mi mathvariant="normal">Λ</mml:mi><mml:mi>b</mml:mi><mml:mn>0</mml:mn></mml:msubsup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>


Aaij, R ORCID: 0000-0003-0533-1952, Abdelmotteleb, ASW ORCID: 0000-0001-7905-0542, Abellan Beteta, C, 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, Afsharnia, H, Agapopoulou, C ORCID: 0000-0002-2368-0147 et al (show 1096 more authors) (2023) Observation and branching fraction measurement of the decay <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi mathvariant="normal">Ξ</mml:mi><mml:mi>b</mml:mi><mml:mo>−</mml:mo></mml:msubsup><mml:mo stretchy="false">→</mml:mo><mml:msubsup><mml:mi mathvariant="normal">Λ</mml:mi><mml:mi>b</mml:mi><mml:mn>0</mml:mn></mml:msubsup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>. Physical Review D, 108 (7). 072002-. ISSN 2470-0010, 2470-0029

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Abstract

The decay Ξ<sup>−</sup><inf>b</inf> → Λ<sup>0</sup><inf>b</inf>π<sup>−</sup> is observed using a proton-proton collision data sample collected at center-of-ffiffi mass energy <sup>p</sup>s ¼ 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 5.5 fb<sup>−1</sup>. This process is mediated by the s → uūd quark-level transition, where the b quark in the Ξ<sup>−</sup><inf>b</inf> baryon is a spectator in the decay. Averaging the results obtained using the two Λ<sup>0</sup><inf>b</inf> decay modes, Λ<sup>0</sup><inf>b</inf> → Λ<sup>þ</sup><inf>c</inf> π<sup>−</sup> and Λ<sup>0</sup><inf>b</inf> → Λ<sup>þ</sup><inf>c</inf> π<sup>−</sup>π<sup>þ</sup>π<sup>−</sup>, the relative production ratio is measured to be ðf<inf>Ξ</inf>−<inf>b</inf> =f<inf>Λ</inf>0 <inf>b</inf>ÞBðΞ<sup>−</sup><inf>b</inf> → Λ<sup>0</sup><inf>b</inf>π<sup>−</sup>Þ ¼ ð7.3 ± 0.8 ± 0.6Þ × 10<sup>−4</sup>. Here the uncertainties are statistical and systematic, respectively, and f<inf>Ξ</inf>−<inf>b</inf> ðf<inf>Λ</inf>0 <inf>b</inf>Þ is the fragmentation fraction for a b quark into a Ξ<sup>−</sup><inf>b</inf> (Λ<sup>0</sup><inf>b</inf>) baryon. Using an independent measurement of f<inf>Ξ</inf>− <inf>b</inf> =f<inf>Λ</inf>0 <inf>b</inf>, the branching fraction BðΞ<sup>−</sup><inf>b</inf> → Λ<sup>0</sup><inf>b</inf>π<sup>−</sup>Þ ¼ ð0.89 ± 0.10 ± 0.07 ± 0.29Þ% is obtained, where the last uncertainty is due to the assumed SU(3) flavor symmetry in the determination of f<inf>Ξ</inf>− <inf>b</inf> =f<inf>Λ</inf>0 <inf>b</inf>,.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 4902 Mathematical Physics, 49 Mathematical Sciences, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 27 Jun 2024 15:21
Last Modified: 09 Jun 2025 15:09
DOI: 10.1103/physrevd.108.072002
Open Access URL: https://journals.aps.org/prd/pdf/10.1103/PhysRevD....
Related Websites:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3182455
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