Abstract
A search for \[C\!P\] violation in charmless four-body decays of \[{\varLambda } ^0_{b} \] and \[{\varXi } ^0_{b} \] baryons with a proton and three charged mesons in the final state is performed. To cancel out production and detection charge-asymmetry effects, the search is carried out by measuring the difference between the \[C\!P\] asymmetries in a charmless decay and in a decay with an intermediate charmed baryon with the same particles in the final state. The data sample used was recorded in 2011 and 2012 with the LHCb detector and corresponds to an integrated luminosity of \[3 \text { fb} ^{-1} \]. A total of 18 \[C\!P\] asymmetries are considered, either accounting for the full phase space of the decays or exploring specific regions of the decay kinematics. No significant \[C\!P\]-violation effect is observed in any of the measurements.
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2 Universidad de Santiago de Compostela, Santiago de Compostela, Spain
3 H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK
4 Clermont Université, Université Blaise Pascal, CNRS/IN2P3, LPC, Clermont-Ferrand, France
5 University of Cincinnati, Cincinnati, OH, USA
6 Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
7 School of Physics and Astronomy, University of Glasgow, Glasgow, UK
8 ICCUB, Universitat de Barcelona, Barcelona, Spain
9 Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
10 Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia
11 Imperial College London, London, UK
12 Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
13 Sezione INFN di Padova, Padua, Italy
14 LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
15 Center for High Energy Physics, Tsinghua University, Beijing, China
16 Sezione INFN di Firenze, Florence, Italy
17 Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
18 Universita e INFN, Ferrara, Ferrara, Italy
19 University of Maryland, College Park, MD, USA
20 School of Physics and Astronomy, University of Manchester, Manchester, UK
21 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
22 Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France
23 Institute for High Energy Physics (IHEP), Protvino, Russia
24 Syracuse University, Syracuse, NY, USA
25 Physik-Institut, Universität Zürich, Zurich, Switzerland
26 Sezione INFN di Roma La Sapienza, Rome, Italy
27 Department of Physics, University of Warwick, Coventry, UK
28 Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil
29 Yandex School of Data Analysis, Moscow, Russia
30 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia
31 National Center for Nuclear Research (NCBJ), Warsaw, Poland
32 LAPP, Université Savoie Mont-Blanc, CNRS/IN2P3, Annecy-Le-Vieux, France
33 Sezione INFN di Pisa, Pisa, Italy
34 Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
35 University of Chinese Academy of Sciences, Beijing, China
36 Universita & INFN, Milano-Bicocca, Milan, Italy
37 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia; European Organization for Nuclear Research (CERN), Geneva, Switzerland
38 LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France
39 Laboratori Nazionali dell’INFN di Frascati, Frascati, Italy
40 I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany
41 Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia
42 Sezione INFN di Bologna, Bologna, Italy
43 University of Birmingham, Birmingham, UK
44 Department of Physics, University of Oxford, Oxford, UK
45 Massachusetts Institute of Technology, Cambridge, MA, USA
46 Budker Institute of Nuclear Physics (SB RAS), Novosibirsk, Russia
47 Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK
48 Universita e INFN, Ferrara, Ferrara, Italy; European Organization for Nuclear Research (CERN), Geneva, Switzerland
49 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
50 Sezione INFN di Cagliari, Cagliari, Italy
51 School of Physics and Technology, Wuhan University, Wuhan, China
52 Sezione INFN di Roma Tor Vergata, Rome, Italy
53 Sezione INFN di Genova, Genoa, Italy
54 School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK
55 Sezione INFN di Genova, Genoa, Italy; European Organization for Nuclear Research (CERN), Geneva, Switzerland
56 Universidad de Santiago de Compostela, Santiago de Compostela, Spain; European Organization for Nuclear Research (CERN), Geneva, Switzerland
57 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland; Physik-Institut, Universität Zürich, Zurich, Switzerland
58 Cavendish Laboratory, University of Cambridge, Cambridge, UK
59 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
60 Sezione INFN di Bari, Bari, Italy
61 Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
62 AGH - University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland
63 Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China
64 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
65 STFC Rutherford Appleton Laboratory, Didcot, UK
66 Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia
67 Sezione INFN di Cagliari, Cagliari, Italy; European Organization for Nuclear Research (CERN), Geneva, Switzerland
68 Sezione di Milano, Milan, Italy
69 Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia - CSIC, Valencia, Spain
70 Institut für Physik, Universität Rostock, Rostock, Germany
71 Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands
72 Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
73 Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia; European Organization for Nuclear Research (CERN), Geneva, Switzerland
74 National Research Centre Kurchatov Institute, Moscow, Russia
75 Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia; European Organization for Nuclear Research (CERN), Geneva, Switzerland
76 European Organization for Nuclear Research (CERN), Geneva, Switzerland; Imperial College London, London, UK
77 School of Physics, University College Dublin, Dublin, Ireland
78 Sezione di Milano, Milan, Italy; European Organization for Nuclear Research (CERN), Geneva, Switzerland
79 Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia
80 Van Swinderen Institute, University of Groningen, Groningen, The Netherlands
81 Laboratori Nazionali dell’INFN di Frascati, Frascati, Italy; European Organization for Nuclear Research (CERN), Geneva, Switzerland
82 Sezione INFN di Firenze, Florence, Italy; European Organization for Nuclear Research (CERN), Geneva, Switzerland
83 Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany; European Organization for Nuclear Research (CERN), Geneva, Switzerland
84 LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France; H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK
85 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia; Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia
86 European Organization for Nuclear Research (CERN), Geneva, Switzerland; Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
87 National Research Tomsk Polytechnic University, Tomsk, Russia
88 Sezione INFN di Bologna, Bologna, Italy; European Organization for Nuclear Research (CERN), Geneva, Switzerland
89 European Organization for Nuclear Research (CERN), Geneva, Switzerland; STFC Rutherford Appleton Laboratory, Didcot, UK





