Isospin amplitudes in $\Lambda_b^0\to J/\psi \Lambda(\Sigma^0)$ and $\Xi_b^0\to J/\psi \Xi^0(\Lambda)$ decays

  title={Isospin amplitudes in \$\Lambda_b^0\to J/\psi \Lambda(\Sigma^0)\$ and \$\Xi_b^0\to J/\psi \Xi^0(\Lambda)\$ decays},
  author={LHCb collaboration R. Aaij and Carlos Abell{\'a}n Beteta and Thomas Ackernley and Bernardo Adeva and M. Adinolfi and H. Afsharnia and Christine A. Aidala and Salvatore Aiola and Ziad Ajaltouni and Simon Akar and Pietro Albicocco and Johannes Albrecht and Federico Alessio and Magazinov Alexander and A. Alfonso Albero and Georgy Alkhazov and P. Alvarez Cartelle and A. A. Alves and Sandra Amato and Yasmine Amhis and L. An and Lucio Anderlini and G. Andreassi and Mirco Andreotti and Flavio Archilli and J. Arnau Romeu and A. Artamonov and Marina Artuso and Kenenbek Arzymatov and Elie Aslanides and Michele Atzeni and B. Audurier and Sebastian Bachmann and J. J. Back and S. Baker and Vladislav Balagura and Wander Baldini and Alexander Baranov and R. J. Barlow and S. Barsuk and William Barter and Matteo Bartolini and F. Baryshnikov and G. Bassi and Varvara Batozskaya and Baasansuren Batsukh and Alexander Battig and Anders Bay and M. Becker and Franco Bedeschi and Ignacio Bediaga and Andrew Beiter and L. J. Bel and Vladimir Belavin and S. Belin and Nikita Beliy and Violaine Bellee and Konstantin Belous and I. Belyaev and Giovanni Bencivenni and Eric Benhaim and Sean Benson and Sarah Beranek and Alexander Berezhnoy and R. Bernet and D. Berninghoff and Hans C. Bernstein and Claudia Bertella and Emilie Bertholet and A. Bertolin and Christopher Betancourt and Federico Betti and M. O. Bettler and Ia. Bezshyiko and Srishti Bhasin and Jihyun Bhom and M. S. Bieker and Simone Bifani and Pierre Billoir and Andrea Bizzeti and Mikkel Bj{\o}rn and M. P. Blago and Thomas Blake and Fr'ed'eric Blanc and Steven Blusk and Dana Bobulska and Valerio Bocci and Octavio Garcia and Thomas Boettcher and A. Boldyrev and Alexander Bondar and N. Bondar and Silvia Borghi and Maxim Borisyak and M. Borsato and Jozef Tomasz Borsuk and T. Bowcock and C. Bozzi and Michael J. Bradley and Svende Braun and Alexandre Brea Rodriguez and Michael Brodski and Jolanta Brodzicka and A. Brossa Gonzalo and Davide Brundu and Emma Buchanan and Annarita Buonaura and C. Burr and Albert Bursche and Julia Butter and Jean Buytaert and Wiktor Byczynski and Sandro Cadeddu and Heshan Cai and R. Calabrese and Liliet Calero Diaz and Stefano Cali and Ryan Calladine and M. Calvi and M{\'i}riam Calvo G{\'o}mez and Patr{\'i}cia Camargo Magalh{\~a}es and Alessandro Camboni and Pierluigi Campana and D. H. Campora Perez and Lorenzo Capriotti and A. Carbone and Graciela Carboni and Roberta Cardinale and Andrea Cardini and Pierre Carniti and K. Carvalho Akiba and Adrian Vidal and G. Casse and Marco Cattaneo and G Cavallero and S. Celani and Riccardo Cenci and Jacopo Cerasoli and M. G. Chapman and M. J. Charles and Ph. Charpentier and Georgios Chatzikonstantinidis and Maximilien Chefdeville and Viktoriia Chekalina and C. Chen and S. Chen and A. Chernov and S.-G. Chitic and Veronika Chobanova and Marcin Jakub Chrzaszcz and Alexsei Chubykin and Paolo Ciambrone and Maria Flavia Cicala and X. Cid Vidal and Gregory Max Ciezarek and Federico Cindolo and P. E. L. Clarke and Marco Clemencic and Harry Cliff and Joel Closier and John Leslie Cobbledick and Victor Coco and J. A. B. Coelho and Julien Cogan and Eric Cogneras and Luminiţa Cojocariu and Pieter Collins and Tommaso Colombo and Albert Comerma-Montells and Andrea Contu and Naomi Cooke and G. Coombs and Samuel Coquereau and Gloria Corti and C. M. Costa Sobral and Benjamin Couturier and Daniel Charles Craik and Jana Crkovská and A. Crocombe and M. Cruz Torres and Robert T. Currie and Christine Da Silva and Elena Dall’Occo and Jeremy Dalseno and Claudia D'Ambrosio and A. A. Danilina and P. d’Argent and Adam Davis and Oscar De Aguiar Francisco and K. De Bruyn and Stefano De Capua and Michel De Cian and J. M. De Miranda and Leandro De Paula and M. De Serio and P. De Simone and J. A. de Vries and C. T. Dean and William Dean and Daniel Decamp and Luigi Del Buono and B. Delaney and H. Dembinski and Moritz Demmer and Adam Mateusz Dendek and Viktoriya Denysenko and Denis Derkach and Olivier Deschamps and Fabrice Desse and Francesco Dettori and Bashab Dey and A. Di Canto and P. di Nezza and S. М. Didenko and H. G. Six Dijkstra and V. Dobishuk and Francesca Dordei and Massimo Dorigo and A. C. dos Reis and L. Douglas and Anatoliy Dovbnya and K. Dreimanis and Maciej Wojciech Dudek and Laurent Dufour and Giulio Dujany and Paolo Durante and J. M. Durham and Deepanwita Dutta and Michal Dziewiecki and Agnieszka Dziurda and A. S. Dzyuba and Santhosh Easo and Ulrik Egede and Victor Egorychev and Semen Eidelman and Sara Eisenhardt and Robert Jan Ekelhof and Semih Ekin and Lars Eklund and S. Ely and Alexandru Catalin Ene and Eliane Epple and Stephan Escher and Sevda Esen and Tecwyn Evans and Antonio Falabella and J. Z. Fan and Naomi Farley and Stephen Farry and Davide Fazzini and P. A. Fedin and Mauricio F{\'e}o and Placido Fernandez Declara and A. Fernandez Prieto and F. Ferrari and L. Ferreira Lopes and F. Ferreira Rodrigues and Silvia Ferreres Sole and Martina Ferrillo and Massimiliano Ferro-Luzzi and Sergey P. Filippov and R. A. Fini and Massimiliano Fiorini and Miroslaw Firlej and K. M. Fischer and C. Fitzpatrick and Tomasz Fiutowski and Frederic Fleuret and M. Fontana and Flavio Fontanelli and Roger Forty and V. Franco Lima and Manuel Franco Sevilla and M. Frank and Christopher M. Frei and David Anthony Friday and J. Fu and M. Fuehring and Wolfgang Funk and E. Gabriel and A. Gallas Torreira and Dina Galli and Stefano Gallorini and Silvia Gambetta and Yuyue Gan and Miriam Gandelman and Piero Gandini and Yan Gao and L. M. Garcia Martin and Juli{\'a}n Garc{\'i}a Pardi{\~n}as and B. Garcia Plana and Felipe Andres Garcia Rosales and Jordi Garra Tico and Ll. Garrido and David Gascon and C. 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Tilley and Vincent Tisserand and S T'jampens and Mark J. Tobin and Siim Tolk and Luca Tomassetti and Domenica Tonelli and Diego Torres Machado and D. Y. Tou and Edwige Tournefier and Maria Traill and Michelle Tran and Carina Trippl and Ana Trisovic and Andrei Tsaregorodtsev and Giulia Tuci and A. Tully and N. Tuning and Artur Ukleja and A. Usachov and Andrei Ustyuzhanin and Ulrich Uwer and A. V{\'a}gner and Vincenzo Vagnoni and Andrea Valassi and Giovanni Valenti and Martinus van Beuzekom and H. van Hecke and E. van Herwijnen and Charlotte Barbara Van Hulse and M. van Veghel and R. Vazquez Gomez and P. Vazquez Regueiro and C. V'azquez Sierra and Stefania Vecchi and J. J. Velthuis and M. Veltri and Aravindhan Venkateswaran and Marc Vernet and Michele Veronesi and Mikko Vesterinen and Justan Barbosa and D. Vieira and M. Vieites Diaz and Harald Viemann and Xavier Vilas{\'i}s-Cardona and Arseniy Vitkovskiy and V. Volkov and Achim Vollhardt and Dorothea Vom Bruch and Alexey Vorobyev and Vitaly Vorobyev and N. Voropaev and Roland Waldi and J. Walsh and Jinli Wang and M. Wang and Y. Wang and Z. Wang and D. R. Ward and H. M. Wark and N. K. Watson and D. Websdale and A. Weiden and Constantin Weisser and B. D. C. Westhenry and Dylan James White and Mark James Whitehead and D. Wiedner and George Wilkinson and M. Wilkinson and Ifan Williams and M. P. Williams and Themistoklis Williams and F. F. Wilson and Wojciech Wislicki and M. Witek and L. Witola and Guy Wormser and S. A. Wotton and H. Wu and Katrina Wyllie and Zhu Xiang and Dongyuan Xiao and Y. Xie and H. Xing and Ao Xu and L. Xu and M. Xu and Q. Xu and Zhuang Xu and Z. Yang and Yushu Yao and L. E. Yeomans and Hongmei Yin and Jia-ming Yu and X. Yuan and Oleg Yushchenko and K. A. Zarebski and Mikhail Zavertyaev and Milosz Zdybal and M. Zeng and Dongqin Zhang and Ls Zhang and Shuili Zhang and W. Chen X.-Y. Zhang and Yanfeng Zhang and Alexey Zhelezov and Yi-qiong Zheng and X. K. Zhou and Yu-yuan Zhou and Xiaoyu Zhu and V. Zhukov and J. B. Zonneveld and Stefano Zucchelli},
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(\Lambda_b^0\to J/\psi \Sigma^0)/A_0… CONTINUE READING

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