Isospin Amplitudes in Λ<sub>b</sub><SUP>0</SUP> → <i>J</i>/ψΛ (Σ<SUP>0</SUP>) and Ξ<sub>b</sub><SUP>0</SUP>→ <i>J</i>/ψΞ<SUP>0</SUP> (Λ) Decays

Aaij, R, Beteta, C Abellan, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Aidala, CA, Aiola, S, Ajaltouni, Z, Akar, S
et al (show 894 more authors) (2020) Isospin Amplitudes in Λ<sub>b</sub><SUP>0</SUP> → <i>J</i>/ψΛ (Σ<SUP>0</SUP>) and Ξ<sub>b</sub><SUP>0</SUP>→ <i>J</i>/ψΞ<SUP>0</SUP> (Λ) Decays. PHYSICAL REVIEW LETTERS, 124 (11). 111802-.

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Ratios of isospin amplitudes in hadron decays are a useful probe of the interplay between weak and strong interactions and allow searches for physics beyond the standard model. We present the first results on isospin amplitudes in b-baryon decays, using data corresponding to an integrated luminosity of 8.5  fb^{-1}, collected with the LHCb detector in pp collisions at center of mass energies of 7, 8, and 13 TeV. The isospin amplitude ratio |A_{1}(Λ_{b}^{0}→J/ψΣ^{0})/A_{0}(Λ_{b}^{0}→J/ψΛ)|, where the subscript on A indicates the final-state isospin, is measured to be less than 1/21.8 at 95% confidence level. The Cabibbo suppressed Ξ_{b}^{0}→J/ψΛ decay is observed for the first time, allowing for the measurement |A_{0}(Ξ_{b}^{0}→J/ψΛ)/A_{1/2}(Ξ_{b}^{0}→J/ψΞ^{0})|=0.37±0.06±0.02, where the uncertainties are statistical and systematic, respectively.

Item Type: Article
Additional Information: All figures and tables, along with machine-readable versions and additional information, are available at (LHCb public pages)
Uncontrolled Keywords: LHCb Collaboration
Depositing User: Symplectic Admin
Date Deposited: 06 May 2020 09:47
Last Modified: 14 Oct 2023 08:20
DOI: 10.1103/PhysRevLett.124.111802
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