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Phys Rev Lett. 2020 Mar 20;124(11):111802. doi: 10.1103/PhysRevLett.124.111802.

Isospin Amplitudes in Λ_{b}^{0}→J/ψΛ(Σ^{0}) and Ξ_{b}^{0}→J/ψΞ^{0}(Λ) Decays.

Physical review letters

R Aaij, C Abellán Beteta, T Ackernley, B Adeva, M Adinolfi, H Afsharnia, C A Aidala, S Aiola, Z Ajaltouni, S Akar, P Albicocco, J Albrecht, F Alessio, M Alexander, A Alfonso Albero, G Alkhazov, P Alvarez Cartelle, A A Alves, S Amato, Y Amhis, L An, L Anderlini, G Andreassi, M Andreotti, F Archilli, J Arnau Romeu, A Artamonov, M Artuso, K Arzymatov, E Aslanides, M Atzeni, B Audurier, S Bachmann, J J Back, S Baker, V Balagura, W Baldini, A Baranov, R J Barlow, S Barsuk, W Barter, M Bartolini, F Baryshnikov, G Bassi, V Batozskaya, B Batsukh, A Battig, A Bay, M Becker, F Bedeschi, I Bediaga, A Beiter, L J Bel, V Belavin, S Belin, N Beliy, V Bellee, K Belous, I Belyaev, G Bencivenni, E Ben-Haim, S Benson, S Beranek, A Berezhnoy, R Bernet, D Berninghoff, H C Bernstein, C Bertella, E Bertholet, A Bertolin, C Betancourt, F Betti, M O Bettler, Ia Bezshyiko, S Bhasin, J Bhom, M S Bieker, S Bifani, P Billoir, A Bizzeti, M Bjørn, M P Blago, T Blake, F Blanc, S Blusk, D Bobulska, V Bocci, O Boente 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Pappenheimer, W Parker, C Parkes, G Passaleva, A Pastore, M Patel, C Patrignani, A Pearce, A Pellegrino, M Pepe Altarelli, S Perazzini, D Pereima, P Perret, L Pescatore, K Petridis, A Petrolini, A Petrov, S Petrucci, M Petruzzo, B Pietrzyk, G Pietrzyk, M Pili, D Pinci, J Pinzino, F Pisani, A Piucci, V Placinta, S Playfer, J Plews, M Plo Casasus, F Polci, M Poli Lener, M Poliakova, A Poluektov, N Polukhina, I Polyakov, E Polycarpo, G J Pomery, S Ponce, A Popov, D Popov, S Poslavskii, K Prasanth, L Promberger, C Prouve, V Pugatch, A Puig Navarro, H Pullen, G Punzi, W Qian, J Qin, R Quagliani, B Quintana, N V Raab, R I Rabadan Trejo, B Rachwal, J H Rademacker, M Rama, M Ramos Pernas, M S Rangel, F Ratnikov, G Raven, M Reboud, F Redi, F Reiss, C Remon Alepuz, Z Ren, V Renaudin, S Ricciardi, S Richards, K Rinnert, P Robbe, A Robert, A B Rodrigues, E Rodrigues, J A Rodriguez Lopez, M Roehrken, S Roiser, A Rollings, V Romanovskiy, M Romero Lamas, A Romero Vidal, J D Roth, M Rotondo, M S 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Affiliations

  1. Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
  2. Physik-Institut, Universität Zürich, Zürich, Switzerland.
  3. Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom.
  4. Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain.
  5. H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom.
  6. Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
  7. University of Michigan, Ann Arbor, USA [associated with Syracuse University, Syracuse, New York, USA].
  8. INFN Sezione di Milano, Milano, Italy.
  9. Los Alamos National Laboratory (LANL), Los Alamos, USA.
  10. INFN Laboratori Nazionali di Frascati, Frascati, Italy.
  11. Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
  12. European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  13. School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
  14. ICCUB, Universitat de Barcelona, Barcelona, Spain.
  15. Petersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI), Gatchina, Russia.
  16. Imperial College London, London, United Kingdom.
  17. Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
  18. LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France.
  19. INFN Sezione di Firenze, Firenze, Italy.
  20. Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
  21. INFN Sezione di Ferrara, Ferrara, Italy.
  22. Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
  23. Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France.
  24. Institute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI), Protvino, Russia, Protvino, Russia.
  25. Syracuse University, Syracuse, New York, USA.
  26. Yandex School of Data Analysis, Moscow, Russia.
  27. INFN Sezione di Cagliari, Monserrato, Italy.
  28. Department of Physics, University of Warwick, Coventry, United Kingdom.
  29. Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
  30. INFN Sezione di Genova, Genova, Italy.
  31. National University of Science and Technology "MISIS", Moscow, Russia [associated with Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia, Moscow, Russia].
  32. INFN Sezione di Pisa, Pisa, Italy.
  33. National Center for Nuclear Research (NCBJ), Warsaw, Poland.
  34. Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil.
  35. University of Chinese Academy of Sciences, Beijing, China.
  36. Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia, Moscow, Russia.
  37. LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France.
  38. I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany.
  39. Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
  40. INFN Sezione di Padova, Padova, Italy.
  41. INFN Sezione di Bologna, Bologna, Italy.
  42. Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
  43. Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
  44. University of Birmingham, Birmingham, United Kingdom.
  45. Department of Physics, University of Oxford, Oxford, United Kingdom.
  46. INFN Sezione di Roma La Sapienza, Roma, Italy.
  47. Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
  48. National Research University Higher School of Economics, Moscow, Russia (associated with Yandex School of Data Analysis, Moscow, Russia).
  49. Budker Institute of Nuclear Physics (SB RAS), Novosibirsk, Russia.
  50. School of Physics and Technology, Wuhan University, Wuhan, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China).
  51. INFN Sezione di Milano-Bicocca, Milano, Italy.
  52. INFN Sezione di Roma Tor Vergata, Roma, Italy.
  53. Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France.
  54. Center for High Energy Physics, Tsinghua University, Beijing, China.
  55. School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
  56. Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
  57. INFN Sezione di Bari, Bari, Italy.
  58. Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
  59. AGH-University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland.
  60. Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China.
  61. Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
  62. NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
  63. STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
  64. School of Physics and Astronomy, Monash University, Melbourne, Australia (associated with Department of Physics, University of Warwick, Coventry, United Kingdom).
  65. Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS), Moscow, Russia.
  66. University of Maryland, College Park, Maryland, USA.
  67. School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China.
  68. Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia-CSIC, Valencia, Spain.
  69. Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil [associated with Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil].
  70. Institute Of High Energy Physics (IHEP), Beijing, China.
  71. Laboratory of Mathematical and Subatomic Physics, Constantine, Algeria [associated with Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil].
  72. Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands.
  73. National Research Tomsk Polytechnic University, Tomsk, Russia [associated with Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia, Moscow, Russia].
  74. South China Normal University, Guangzhou, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China).
  75. National Research Centre Kurchatov Institute, Moscow, Russia [associated with Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia, Moscow, Russia].
  76. School of Physics, University College Dublin, Dublin, Ireland.
  77. University of Cincinnati, Cincinnati, Ohio, USA.
  78. Institut für Physik, Universität Rostock, Rostock, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
  79. Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France).
  80. Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands).

PMID: 32242683 DOI: 10.1103/PhysRevLett.124.111802

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 |A_{1}(Λ_{b}^{0}→J/ψΣ^{0})/A_{0}(Λ_{b}^{0}→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 Ξ_{b}^{0}→J/ψΛ decay is observed for the first time, allowing for the measurement |A_{0}(Ξ_{b}^{0}→J/ψΛ)/A_{1/2}(Ξ_{b}^{0}→J/ψΞ^{0})|=0.37±0.06±0.02, where the uncertainties are statistical and systematic, respectively.

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