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T.Trippl, C.Trisovic, A.Tsaregorodtsev, A.Tuci, G.Tully, A.Tuning, N.Ukleja, A.Usachov, A.Ustyuzhanin, A.Uwer, U.Vagner, A.Vagnoni, V.Valassi, A.Valenti, G.van Beuzekom, M.Van Hecke, H.van Herwijnen, E.Van Hulse, C. B.van Veghel, M.Vazquez Gomez, R.Vazquez Regueiro, P.Sierra, C. VazquezVecchi, S.Velthuis, J. J.Veltri, M.Venkateswaran, A.Vernet, M.Veronesi, M.Vesterinen, M.Barbosa, J. V. VianaVieira, D.Diaz, M. VieitesViemann, H.Vilasis-Cardona, X.Vitkovskiy, A.Volkov, V.Vollhardt, A.Vom Bruch, D.Vorobyev, A.Vorobyev, V.Voropaev, N.Waldi, R.Walsh, J.Wang, J.Wang, M.Wang, Y.Wang, Z.Ward, D. R.Wark, H. M.Watson, N. K.Websdale, D.Weiden, A.Weisser, C.Westhenry, B. D. C.White, D. J.Whitehead, M.Wiedner, D.Wilkinson, G.Wilkinson, M.Williams, IWilliams, M.Williams, M. R. J.Williams, T.Wilson, F. F.Wislicki, W.Witek, M.Witola, L.Wormser, G.Wotton, S. A.Wu, H.Wyllie, K.Xiang, Z.Xiao, D.Xie, Y.Xing, H.Xu, A.Xu, L.Xu, M.Xu, Q.Xu, Z.Yang, Z.Yao, Y.Yeomans, L. E.Yin, H.Yu, J.Yuan, X.Yushchenko, O.Zarebski, K. A.Zavertyaev, M.Zdybal, M.Zeng, M.Zhang, D.Zhang, L.Zhang, S.Zhang, W. C.Zhang, Y.Zhelezov, A.Zheng, Y.Zhou, X.Zhou, Y.Zhu, X.Zhukov, VZonneveld, J. B.Zucchelli, S.2020-04-042020-04-042020-04-042020-03-1710.1103/PhysRevLett.124.111802https://infoscience.epfl.ch/handle/20.500.14299/167958WOS:000519994700005Ratios 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 vertical bar A(1) (Delta(0)(b) -> J/psi(Sigma(0)) /A(0) (Delta(0)(b) -> J/psi Lambda)vertical bar, 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 Xi(0)(b) -> J/psi Lambda decay is observed for the first time, allowing for the measurement vertical bar A(0) (Xi(0)(b) -> J/psi Lambda) / A(1/2 )(Xi(0)(b) -> J/psi Xi(0))vertical bar = 0.37 +/- 0.06 +/- 0.02, where the uncertainties are statistical and systematic, respectively.Physics, MultidisciplinaryPhysicssymmetrytooltext::journal::journal article::research article