Isospin Amplitudes in Λb0 →J/ψ Λ (ς0) and Ξb0 →J/ψ Ξ0 (Λ) Decays

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Aaij, R, Beteta, CA, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Aidala, CA, Aiola, S, Ajaltouni, Z, Akar, S et al (show 90 more authors) , Albicocco, P, Albrecht, J, Alessio, F, Alexander, M, Albero, AA, Alkhazov, G, Cartelle, PA, Alves, AA, Amato, S, Amhis, Y, An, L, Anderlini, L, Andreassi, G, Andreotti, M, Archilli, F, Romeu, JA, Artamonov, A, Artuso, M, Arzymatov, K, Aslanides, E, Atzeni, M, Audurier, B, Bachmann, S, Back, JJ, Baker, S, Balagura, V, Baldini, W, Baranov, A, Barlow, RJ, Barsuk, S, Barter, W, Bartolini, M, Baryshnikov, F, Bassi, G, Batozskaya, V, Batsukh, B, Battig, A, Bay, A, Becker, M, Bedeschi, F, Bediaga, I, Beiter, A, Bel, LJ, Belavin, V, Belin, S, Beliy, N, Bellee, V, Belous, K, Belyaev, I, Bencivenni, G, Ben-Haim, E, Benson, S, Beranek, S, Berezhnoy, A, Bernet, R, Berninghoff, D, Bernstein, HC, Bertella, C, Bertholet, E, Bertolin, A, Betancourt, C, Betti, F, Bettler, MO, Bezshyiko, I, Bhasin, S, Bhom, J, Bieker, MS, Bifani, S, Billoir, P, Bizzeti, A, Bjørn, M, Blago, MP, Blake, T, Blanc, F, Blusk, S, Bobulska, D, Bocci, V, Garcia, OB, Boettcher, T, Boldyrev, A, Bondar, A, Bondar, N, Borghi, S, Borisyak, M, Borsato, M, Borsuk, JT, Bowcock, TJV ORCID: 0000-0002-3505-6915, Bozzi, C, Bradley, MJ and Braun, S (2020) Isospin Amplitudes in Λb0 →J/ψ Λ (ς0) and Ξb0 →J/ψ Ξ0 (Λ) Decays Physical Review Letters, 124 (11). 111802-. ISSN 0031-9007, 1079-7114

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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(Λb0→J/ψς0)/A0(Λb0→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 Ξb0→J/ψΛ decay is observed for the first time, allowing for the measurement |A0(Ξb0→J/ψΛ)/A1/2(Ξb0→J/ψΞ0)|=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 https://lhcbproject.web.cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2019-039.html (LHCb public pages)
Uncontrolled Keywords:	LHCb Collaboration
Depositing User:	Symplectic Admin
Date Deposited:	06 May 2020 09:47
Last Modified:	22 Jan 2026 08:18
DOI:	10.1103/PhysRevLett.124.111802
Open Access URL:	https://journals.aps.org/prl/pdf/10.1103/PhysRevLe...
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3086096
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