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Observation and branching fraction measurement of the decay Ξ−b → Λ0bπ

The decay Ξ−𝑏→Λ0𝑏⁢𝜋− is observed using a proton-proton collision data sample collected at center-of-mass energy √𝑠=13 TeV with the LHCb detector, corresponding to an integrated luminosity of 5.5 fb−1. This process is mediated by the 𝑠→𝑢⁢¯𝑢⁢𝑑 quark-level transition, where the 𝑏 quark in the Ξ−𝑏 baryo...

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Main Authors: Bachmann, Sebastian (Author) , Borsato, Martino (Author) , Carus, Leon (Author) , Caspary, Rowina (Author) , Cocha Toapaxi, Carlos (Author) , De Cian, Michel (Author) , Frau, Giulia (Author) , Glaser, Fabian (Author) , Günther, Paul André (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Hu, Jiangqiao (Author) , Kubat, Jakub (Author) , Langenbruch, Christoph (Author) , Leverington, Blake (Author) , Marks, Jörg (Author) , Morgenthaler, Maurice Pierre (Author) , Pais, Preema (Author) , Skuza, Raphael (Author) , Tuci, Giulia (Author) , Unverzagt, Daniel Joachim (Author) , Uwer, Ulrich (Author) , Wang, Chishuai (Author) , Witola, Lukas (Author) , Zhao, Ya (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Other Authors: Aaij, Roel (Other)
Format: Article (Journal)
Language:English
Published: 6 October 2023
In: Physical review
Year: 2023, Volume: 108, Issue: 7, Pages: 1-16
ISSN:2470-0029
DOI:10.1103/PhysRevD.108.072002
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevD.108.072002
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.108.072002
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Author Notes:R. Aaij et al. (LHCb Collaboration)
Description
Summary:The decay Ξ−𝑏→Λ0𝑏⁢𝜋− is observed using a proton-proton collision data sample collected at center-of-mass energy √𝑠=13 TeV with the LHCb detector, corresponding to an integrated luminosity of 5.5 fb−1. This process is mediated by the 𝑠→𝑢⁢¯𝑢⁢𝑑 quark-level transition, where the 𝑏 quark in the Ξ−𝑏 baryon is a spectator in the decay. Averaging the results obtained using the two Λ0𝑏 decay modes, Λ0𝑏→Λ+𝑐⁢𝜋− and Λ0𝑏→Λ+𝑐⁢𝜋−⁢𝜋+⁢𝜋−, the relative production ratio is measured to be (𝑓Ξ−𝑏/𝑓Λ0𝑏)⁢ℬ⁡(Ξ−𝑏→Λ0𝑏⁢𝜋−)=(7.3±0.8±0.6)×10−4. Here the uncertainties are statistical and systematic, respectively, and 𝑓Ξ−𝑏⁡(𝑓Λ0𝑏) is the fragmentation fraction for a 𝑏 quark into a Ξ−𝑏 (Λ0𝑏) baryon. Using an independent measurement of 𝑓Ξ−𝑏/𝑓Λ0𝑏, the branching fraction ℬ⁡(Ξ−𝑏→Λ0𝑏⁢𝜋−)=(0.89±0.10±0.07±0.29)% is obtained, where the last uncertainty is due to the assumed SU(3) flavor symmetry in the determination of 𝑓Ξ−𝑏/𝑓Λ0𝑏.
Item Description:Im Titel ist b tiefgestellt, die 0 hochgestellt
LHCb Collaboration: R. Aaij, S. Bachmann, M. Borsato, L. Carus, R. Caspary, C. Cocha Toapaxi, M. De Cian, G. Frau, F. Glaser, P.A. Günther, X. Han, S. Hansmann-Menzemer, J. Hu, J. Kubat, C. Langenbruch, B. Leverington, J. Marks, M.P. Morgenthaler, R. Skuza, P.R. Pais, G. Tuci, D.J. Unverzagt, U. Uwer, C. Wang, L. Witola, Y. Zhao, A. Zhelezov [und 1079 weitere]
Gesehen am 25.06.2024
Physical Description:Online Resource
ISSN:2470-0029
DOI:10.1103/PhysRevD.108.072002

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