@article{3867c095e8274266a593c12a92da1dcd,
title = "Isospin Amplitudes in Λb0 →J/ψ Λ (ς0) and Ξb0 →J/ψ Ξ0 (Λ) Decays",
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.",
author = "R. Aaij and \{Abell{\'a}n Beteta\}, C. and T. Ackernley and B. Adeva and M. Adinolfi and H. Afsharnia and Aidala, \{C. A.\} and S. Aiola and Z. Ajaltouni and S. Akar and P. Albicocco and J. Albrecht and F. Alessio and M. Alexander and \{Alfonso Albero\}, A. and G. Alkhazov and \{Alvarez Cartelle\}, P. and Alves, \{A. A.\} and S. Amato and Y. Amhis and L. An and L. Anderlini and G. Andreassi and M. Andreotti and F. Archilli and \{Arnau Romeu\}, J. and A. Artamonov and M. Artuso and K. Arzymatov and E. Aslanides and M. Atzeni and B. Audurier and S. Bachmann and Back, \{J. J.\} and S. Baker and V. Balagura and W. Baldini and A. Baranov and Barlow, \{R. J.\} and S. Barsuk and W. Barter and M. Bartolini and F. Baryshnikov and G. Bassi and V. Batozskaya and B. Batsukh and A. Battig and A. Bay and M. Becker and F. Bedeschi and I. Bediaga and A. Beiter and Bel, \{L. J.\} and V. Belavin and S. Belin and N. Beliy and V. Bellee and K. Belous and I. Belyaev and G. Bencivenni and E. Ben-Haim and S. Benson and S. Beranek and A. Berezhnoy and R. Bernet and D. Berninghoff and Bernstein, \{H. C.\} and C. Bertella and E. Bertholet and A. Bertolin and C. Betancourt and F. Betti and Bettler, \{M. O.\} and Ia Bezshyiko and S. Bhasin and J. Bhom and Bieker, \{M. S.\} and S. Bifani and P. Billoir and A. Bizzeti and M. Bj{\o}rn and Blago, \{M. P.\} and T. Blake and F. Blanc and S. Blusk and D. Bobulska and V. Bocci and \{Boente Garcia\}, O. and T. Boettcher and A. Boldyrev and A. Bondar and N. Bondar and S. Borghi and M. Borisyak and M. Borsato and Borsuk, \{J. T.\} and Bowcock, \{T. J.V.\} and C. Bozzi and Bradley, \{M. J.\} and S. Braun and \{Brea Rodriguez\}, A. and M. Brodski and J. Brodzicka and \{Brossa Gonzalo\}, A. and D. Brundu and E. Buchanan and A. Buonaura and C. Burr and A. Bursche and Butter, \{J. S.\} and J. Buytaert and W. Byczynski and S. Cadeddu and H. Cai and R. Calabrese and \{Calero Diaz\}, L. and S. Cali and R. Calladine and M. Calvi and \{Calvo Gomez\}, M. and \{Camargo Magalhaes\}, P. and A. Camboni and P. Campana and \{Campora Perez\}, \{D. H.\} and L. Capriotti and A. Carbone and G. Carboni and R. Cardinale and A. Cardini and P. Carniti and \{Carvalho Akiba\}, K. and \{Casais Vidal\}, A. and G. Casse and M. Cattaneo and G. Cavallero and S. Celani and R. Cenci and J. Cerasoli and Chapman, \{M. G.\} and M. Charles and Ph Charpentier and G. Chatzikonstantinidis and M. Chefdeville and V. Chekalina and C. Chen and S. Chen and A. Chernov and Chitic, \{S. G.\} and V. Chobanova and M. Chrzaszcz and A. Chubykin and P. Ciambrone and Cicala, \{M. F.\} and \{Cid Vidal\}, X. and G. Ciezarek and F. Cindolo and Clarke, \{P. E.L.\} and M. Clemencic and Cliff, \{H. V.\} and J. Closier and Cobbledick, \{J. L.\} and V. Coco and Coelho, \{J. A.B.\} and J. Cogan and E. Cogneras and L. Cojocariu and P. Collins and T. Colombo and A. Comerma-Montells and A. Contu and N. Cooke and G. Coombs and S. Coquereau and G. Corti and \{Costa Sobral\}, \{C. M.\} and B. Couturier and Craik, \{D. C.\} and J. Crkovska and A. Crocombe and \{Cruz Torres\}, M. and R. Currie and \{Da Silva\}, \{C. L.\} and E. Dall'occo and J. Dalseno and C. D'ambrosio and A. Danilina and P. D'argent and A. Davis and \{De Aguiar Francisco\}, O. and \{De Bruyn\}, K. and \{De Capua\}, S. and \{De Cian\}, M. and \{De Miranda\}, \{J. M.\} and \{De Paula\}, L. and \{De Serio\}, M. and \{De Simone\}, P. and \{De Vries\}, \{J. A.\} and Dean, \{C. T.\} and W. Dean and D. Decamp and \{Del Buono\}, L. and B. Delaney and Dembinski, \{H. P.\} and M. Demmer and A. Dendek and V. Denysenko and D. Derkach and O. Deschamps and F. Desse and F. Dettori and B. Dey and \{Di Canto\}, A. and \{Di Nezza\}, P. and S. Didenko and H. Dijkstra and V. Dobishuk and F. Dordei and M. Dorigo and \{Dos Reis\}, \{A. C.\} and L. Douglas and A. Dovbnya and K. Dreimanis and Dudek, \{M. W.\} and L. Dufour and G. Dujany and P. Durante and Durham, \{J. M.\} and D. 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Gao and \{Garcia Martin\}, \{L. M.\} and \{Garci{\'a} Pardin{\~a}s\}, J. and \{Garcia Plana\}, B. and \{Garcia Rosales\}, \{F. A.\} and \{Garra Tico\}, J. and L. Garrido and D. Gascon and C. Gaspar and D. Gerick and E. Gersabeck and M. Gersabeck and T. Gershon and D. Gerstel and Ph Ghez and V. Gibson and A. Giovent{\`u} and Girard, \{O. G.\} and \{Gironella Gironell\}, P. and L. Giubega and C. Giugliano and K. Gizdov and Gligorov, \{V. V.\} and C. G{\"o}bel and D. Golubkov and A. Golutvin and A. Gomes and P. Gorbounov and Gorelov, \{I. V.\} and C. Gotti and E. Govorkova and Grabowski, \{J. P.\} and \{Graciani Diaz\}, R. and T. Grammatico and \{Granado Cardoso\}, \{L. A.\} and E. Graug{\'e}s and E. Graverini and G. Graziani and A. Grecu and R. Greim and P. Griffith and L. Grillo and L. Gruber and \{Gruberg Cazon\}, \{B. R.\} and C. Gu and E. Gushchin and A. Guth and Yu Guz and T. Gys and P. G{\"u}nther and T. Hadavizadeh and G. Haefeli and C. Haen and Haines, \{S. 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Luo and A. Lupato and E. Luppi and O. Lupton and A. Lusiani and X. Lyu and S. Maccolini and F. Machefert and F. Maciuc and V. Macko and P. Mackowiak and S. Maddrell-Mander and \{Madhan Mohan\}, \{L. R.\} and O. Maev and A. Maevskiy and D. Maisuzenko and Majewski, \{M. W.\} and S. Malde and B. Malecki and A. Malinin and T. Maltsev and H. Malygina and G. Manca and G. Mancinelli and \{Manera Escalero\}, R. and D. Manuzzi and D. Marangotto and J. Maratas and Marchand, \{J. F.\} and U. Marconi and S. Mariani and \{Marin Benito\}, C. and M. Marinangeli and P. Marino and J. Marks and Marshall, \{P. J.\} and G. Martellotti and L. Martinazzoli and M. Martinelli and \{Martinez Santos\}, D. and \{Martinez Vidal\}, F. and A. Massafferri and M. Materok and R. Matev and A. Mathad and Z. Mathe and V. Matiunin and C. Matteuzzi and Mattioli, \{K. R.\} and A. Mauri and E. Maurice and M. Mccann and L. Mcconnell and A. Mcnab and R. Mcnulty and Mead, \{J. V.\} and B. Meadows and C. Meaux and G. 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Smith and A. Snoch and M. Soares and \{Soares Lavra\}, L. and Sokoloff, \{M. D.\} and Soler, \{F. J.P.\} and \{Souza De Paula\}, B. and B. Spaan and \{Spadaro Norella\}, E. and P. Spradlin and F. Stagni and M. Stahl and S. Stahl and P. Stefko and O. Steinkamp and S. Stemmle and O. Stenyakin and M. Stepanova and H. Stevens and S. Stone and S. Stracka and Stramaglia, \{M. E.\} and M. Straticiuc and S. Strokov and J. Sun and L. Sun and Y. Sun and P. Svihra and K. Swientek and A. Szabelski and T. Szumlak and M. Szymanski and S. Taneja and Z. Tang and T. Tekampe and G. Tellarini and F. Teubert and E. Thomas and Thomson, \{K. A.\} and Tilley, \{M. J.\} and V. Tisserand and S. T'jampens and M. Tobin and S. Tolk and L. Tomassetti and D. Tonelli and \{Torres Machado\}, D. and Tou, \{D. Y.\} and E. Tournefier and M. Traill and Tran, \{M. T.\} and C. Trippl and A. Trisovic and A. Tsaregorodtsev and G. Tuci and A. Tully and N. Tuning and A. Ukleja and A. Usachov and A. Ustyuzhanin and U. 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R.J.\} and T. Williams and Wilson, \{F. F.\} and W. Wislicki and M. Witek and L. Witola and G. Wormser and Wotton, \{S. A.\} and H. Wu and K. Wyllie and Z. Xiang and D. Xiao and Y. Xie and H. Xing and A. Xu and L. Xu and M. Xu and Q. Xu and Z. Xu and Z. Xu and Z. Yang and Z. Yang and Y. Yao and Yeomans, \{L. E.\} and H. Yin and J. Yu and X. Yuan and O. Yushchenko and Zarebski, \{K. A.\} and M. Zavertyaev and M. Zdybal and M. Zeng and D. Zhang and L. Zhang and S. Zhang and Zhang, \{W. C.\} and Y. Zhang and A. Zhelezov and Y. Zheng and X. Zhou and Y. Zhou and X. Zhu and V. Zhukov and Zonneveld, \{J. B.\} and S. Zucchelli and \{LHCb Collaboration\}",
year = "2020",
month = mar,
day = "20",
doi = "10.1103/PhysRevLett.124.111802",
language = "English",
volume = "124",
pages = "1--11",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "11",
}
