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 |A1(Λ0b → J/ψ Σ0) / A0(Λ0b → J/ψ Λ)|, 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 Ξ0b → J/ψ Λ decay is observed for the first time, allowing for the measurement |A0(Ξ0b → J/ψ Λ) / A1/2(Ξ0b → J/ψ Ξ0)| = 0.37 ± 0.06 ± 0.02, where the uncertainties are statistical and systematic, respectively.

Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2020). Isospin Amplitudes in Λ0b → J/ψ Λ (Σ0) and Ξ0b → J/ψ Ξ0 (Λ) Decays. PHYSICAL REVIEW LETTERS, 124(11), 1-11 [10.1103/PhysRevLett.124.111802].

Isospin Amplitudes in Λ0b → J/ψ Λ (Σ0) and Ξ0b → J/ψ Ξ0 (Λ) Decays

Betti, F.;Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Maccolini, S.;Manuzzi, D.;Patrignani, C.;Perazzini, S.;Pisani, F.;Zucchelli, S.
2020

Abstract

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 |A1(Λ0b → J/ψ Σ0) / A0(Λ0b → J/ψ Λ)|, 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 Ξ0b → J/ψ Λ decay is observed for the first time, allowing for the measurement |A0(Ξ0b → J/ψ Λ) / A1/2(Ξ0b → J/ψ Ξ0)| = 0.37 ± 0.06 ± 0.02, where the uncertainties are statistical and systematic, respectively.
2020
Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2020). Isospin Amplitudes in Λ0b → J/ψ Λ (Σ0) and Ξ0b → J/ψ Ξ0 (Λ) Decays. PHYSICAL REVIEW LETTERS, 124(11), 1-11 [10.1103/PhysRevLett.124.111802].
Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C.A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albicocco, P.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/772361
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