Observation of photon polarization in the b→sγ transition
Affiliations
- 1 Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.
- 2 Universidad de Santiago de Compostela, Santiago de Compostela, Spain.
- 3 H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom.
- 4 Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom.
- 5 Clermont Université, Université Blaise Pascal, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
- 6 Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
- 7 European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 8 School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 9 Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia.
- 10 Sezione INFN di Roma La Sapienza, Roma, Italy.
- 11 Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
- 12 Sezione INFN di Padova, Padova, Italy.
- 13 LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France.
- 14 Sezione INFN di Firenze, Firenze, Italy.
- 15 Physik-Institut, Universität Zürich, Zürich, Switzerland.
- 16 University of Cincinnati, Cincinnati, Ohio, USA.
- 17 Sezione INFN di Ferrara, Ferrara, Italy.
- 18 University of Maryland, College Park, Maryland, USA.
- 19 School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
- 20 Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
- 21 Institute for High Energy Physics (IHEP), Protvino, Russia.
- 22 Syracuse University, Syracuse, New York, USA.
- 23 CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France.
- 24 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
- 25 Department of Physics, University of Warwick, Coventry, United Kingdom.
- 26 Universitat de Barcelona, Barcelona, Spain.
- 27 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia.
- 28 Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 29 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
- 30 National Center for Nuclear Research (NCBJ), Warsaw, Poland.
- 31 Sezione INFN di Pisa, Pisa, Italy.
- 32 Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil.
- 33 LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3 Paris, France.
- 34 Laboratori Nazionali dell'INFN di Frascati, Frascati, Italy.
- 35 School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
- 36 Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
- 37 University of Birmingham, Birmingham, United Kingdom.
- 38 Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia.
- 39 Sezione INFN di Cagliari, Cagliari, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 40 Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands.
- 41 Sezione INFN di Cagliari, Cagliari, Italy.
- 42 Sezione INFN di Milano Bicocca, Milano, Italy.
- 43 Laboratori Nazionali dell'INFN di Frascati, Frascati, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 44 Sezione INFN di Milano, Milano, Italy.
- 45 Sezione INFN di Bologna, Bologna, Italy.
- 46 Sezione INFN di Roma Tor Vergata, Roma, Italy.
- 47 Sezione INFN di Genova, Genova, Italy.
- 48 Department of Physics, University of Oxford, Oxford, United Kingdom.
- 49 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland and Physik-Institut, Universität Zürich, Zürich, Switzerland.
- 50 Imperial College London, London, United Kingdom.
- 51 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
- 52 Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
- 53 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).
- 54 LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France.
- 55 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
- 56 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 57 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 58 European Organization for Nuclear Research (CERN), Geneva, Switzerland and School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 59 Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia.
- 60 Sezione INFN di Firenze, Firenze, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 61 Center for High Energy Physics, Tsinghua University, Beijing, China.
- 62 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia and European Organization for Nuclear Research (CERN), Geneva, Switzerland and Imperial College London, London, United Kingdom.
- 63 Institut für Physik, Universität Rostock, Rostock, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
- 64 Institute for High Energy Physics (IHEP), Protvino, Russia and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 65 KVI-University of Groningen, Groningen, The Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands).
- 66 Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Kraków, Poland.
- 67 Sezione INFN di Milano Bicocca, Milano, Italy and Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 68 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 69 Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 70 Instituto de Fisica Corpuscular (IFIC), Universitat de Valencia-CSIC, Valencia, Spain (associated with Universitat de Barcelona, Barcelona, Spain).
- 71 Sezione INFN di Ferrara, Ferrara, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 72 School of Physics, University College Dublin, Dublin, Ireland.
- 73 Department of Physics, University of Oxford, Oxford, United Kingdom and University of Cincinnati, Cincinnati, Ohio, USA.
- 74 Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
- 75 Sezione INFN di Bari, Bari, Italy.
- 76 European Organization for Nuclear Research (CERN), Geneva, Switzerland and STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 77 Celal Bayar University, Manisa, Turkey (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland).
- 78 Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia and Department of Physics, University of Warwick, Coventry, United Kingdom.
- 79 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia and Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
- 80 Sezione INFN di Ferrara, Ferrara, Italy and NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 81 National Research Centre Kurchatov Institute, Moscow, Russia (associated with Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia).
- 82 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom and Department of Physics, University of Oxford, Oxford, United Kingdom.
- 83 Sezione INFN di Pisa, Pisa, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 84 European Organization for Nuclear Research (CERN), Geneva, Switzerland and Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 85 LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France and Imperial College London, London, United Kingdom.
- 86 Department of Physics, University of Warwick, Coventry, United Kingdom and STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 87 European Organization for Nuclear Research (CERN), Geneva, Switzerland and School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
- PMID: 24815636
- DOI: 10.1103/PhysRevLett.112.161801
Observation of photon polarization in the b→sγ transition
Authors
Affiliations
- 1 Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.
- 2 Universidad de Santiago de Compostela, Santiago de Compostela, Spain.
- 3 H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom.
- 4 Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom.
- 5 Clermont Université, Université Blaise Pascal, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
- 6 Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
- 7 European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 8 School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 9 Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia.
- 10 Sezione INFN di Roma La Sapienza, Roma, Italy.
- 11 Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
- 12 Sezione INFN di Padova, Padova, Italy.
- 13 LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France.
- 14 Sezione INFN di Firenze, Firenze, Italy.
- 15 Physik-Institut, Universität Zürich, Zürich, Switzerland.
- 16 University of Cincinnati, Cincinnati, Ohio, USA.
- 17 Sezione INFN di Ferrara, Ferrara, Italy.
- 18 University of Maryland, College Park, Maryland, USA.
- 19 School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
- 20 Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
- 21 Institute for High Energy Physics (IHEP), Protvino, Russia.
- 22 Syracuse University, Syracuse, New York, USA.
- 23 CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France.
- 24 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
- 25 Department of Physics, University of Warwick, Coventry, United Kingdom.
- 26 Universitat de Barcelona, Barcelona, Spain.
- 27 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia.
- 28 Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 29 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
- 30 National Center for Nuclear Research (NCBJ), Warsaw, Poland.
- 31 Sezione INFN di Pisa, Pisa, Italy.
- 32 Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil.
- 33 LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3 Paris, France.
- 34 Laboratori Nazionali dell'INFN di Frascati, Frascati, Italy.
- 35 School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
- 36 Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
- 37 University of Birmingham, Birmingham, United Kingdom.
- 38 Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia.
- 39 Sezione INFN di Cagliari, Cagliari, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 40 Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands.
- 41 Sezione INFN di Cagliari, Cagliari, Italy.
- 42 Sezione INFN di Milano Bicocca, Milano, Italy.
- 43 Laboratori Nazionali dell'INFN di Frascati, Frascati, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 44 Sezione INFN di Milano, Milano, Italy.
- 45 Sezione INFN di Bologna, Bologna, Italy.
- 46 Sezione INFN di Roma Tor Vergata, Roma, Italy.
- 47 Sezione INFN di Genova, Genova, Italy.
- 48 Department of Physics, University of Oxford, Oxford, United Kingdom.
- 49 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland and Physik-Institut, Universität Zürich, Zürich, Switzerland.
- 50 Imperial College London, London, United Kingdom.
- 51 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
- 52 Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
- 53 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).
- 54 LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France.
- 55 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
- 56 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 57 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 58 European Organization for Nuclear Research (CERN), Geneva, Switzerland and School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 59 Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia.
- 60 Sezione INFN di Firenze, Firenze, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 61 Center for High Energy Physics, Tsinghua University, Beijing, China.
- 62 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia and European Organization for Nuclear Research (CERN), Geneva, Switzerland and Imperial College London, London, United Kingdom.
- 63 Institut für Physik, Universität Rostock, Rostock, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
- 64 Institute for High Energy Physics (IHEP), Protvino, Russia and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 65 KVI-University of Groningen, Groningen, The Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands).
- 66 Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Kraków, Poland.
- 67 Sezione INFN di Milano Bicocca, Milano, Italy and Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 68 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 69 Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 70 Instituto de Fisica Corpuscular (IFIC), Universitat de Valencia-CSIC, Valencia, Spain (associated with Universitat de Barcelona, Barcelona, Spain).
- 71 Sezione INFN di Ferrara, Ferrara, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 72 School of Physics, University College Dublin, Dublin, Ireland.
- 73 Department of Physics, University of Oxford, Oxford, United Kingdom and University of Cincinnati, Cincinnati, Ohio, USA.
- 74 Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
- 75 Sezione INFN di Bari, Bari, Italy.
- 76 European Organization for Nuclear Research (CERN), Geneva, Switzerland and STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 77 Celal Bayar University, Manisa, Turkey (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland).
- 78 Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia and Department of Physics, University of Warwick, Coventry, United Kingdom.
- 79 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia and Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
- 80 Sezione INFN di Ferrara, Ferrara, Italy and NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 81 National Research Centre Kurchatov Institute, Moscow, Russia (associated with Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia).
- 82 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom and Department of Physics, University of Oxford, Oxford, United Kingdom.
- 83 Sezione INFN di Pisa, Pisa, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 84 European Organization for Nuclear Research (CERN), Geneva, Switzerland and Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 85 LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France and Imperial College London, London, United Kingdom.
- 86 Department of Physics, University of Warwick, Coventry, United Kingdom and STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 87 European Organization for Nuclear Research (CERN), Geneva, Switzerland and School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
- PMID: 24815636
- DOI: 10.1103/PhysRevLett.112.161801
Abstract
This Letter presents a study of the flavor-changing neutral current radiative B±→K±π∓π±γ decays performed using data collected in proton-proton collisions with the LHCb detector at 7 and 8 TeV center-of-mass energies. In this sample, corresponding to an integrated luminosity of 3 fb-1, nearly 14 000 signal events are reconstructed and selected, containing all possible intermediate resonances with a K±π∓π± final state in the [1.1,1.9] GeV/c2 mass range. The distribution of the angle of the photon direction with respect to the plane defined by the final-state hadrons in their rest frame is studied in intervals of K±π∓π± mass and the asymmetry between the number of signal events found on each side of the plane is obtained. The first direct observation of the photon polarization in the b→sγ transition is reported with a significance of 5.2σ.
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