First measurement of the charge asymmetry in beauty-quark pair production
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 CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France.
- 7 Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
- 8 European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 9 School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 10 Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia.
- 11 Sezione INFN di Roma La Sapienza, Roma, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 12 Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
- 13 Sezione INFN di Padova, Padova, 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, Firenze, Italy.
- 17 Physik-Institut, Universität Zürich, Zürich, Switzerland.
- 18 University of Cincinnati, Cincinnati, Ohio, USA.
- 19 Sezione INFN di Ferrara, Ferrara, Italy.
- 20 University of Maryland, College Park, Maryland, USA.
- 21 School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
- 22 Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
- 23 Institute for High Energy Physics (IHEP), Protvino, Russia.
- 24 Syracuse University, Syracuse, New York, USA.
- 25 Sezione INFN di Roma La Sapienza, Roma, Italy.
- 26 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
- 27 Department of Physics, University of Warwick, Coventry, United Kingdom.
- 28 Universitat de Barcelona, Barcelona, Spain.
- 29 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia.
- 30 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
- 31 National Center for Nuclear Research (NCBJ), Warsaw, Poland.
- 32 Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 33 LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France.
- 34 Sezione INFN di Pisa, Pisa, Italy.
- 35 Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil.
- 36 LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France.
- 37 Laboratori Nazionali dell'INFN di Frascati, Frascati, Italy.
- 38 Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
- 39 University of Birmingham, Birmingham, United Kingdom.
- 40 Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia.
- 41 Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 42 Sezione INFN di Cagliari, Cagliari, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 43 Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands.
- 44 Sezione INFN di Cagliari, Cagliari, Italy.
- 45 Sezione INFN di Milano Bicocca, Milano, Italy.
- 46 Laboratori Nazionali dell'INFN di Frascati, Frascati, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 47 Sezione INFN di Bologna, Bologna, Italy.
- 48 Sezione INFN di Roma Tor Vergata, Roma, Italy.
- 49 Sezione INFN di Genova, Genova, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 50 School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
- 51 Department of Physics, University of Oxford, Oxford, United Kingdom.
- 52 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland and Physik-Institut, Universität Zürich, Zürich, Switzerland.
- 53 Imperial College London, London, United Kingdom.
- 54 Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
- 55 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).
- 56 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 57 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
- 58 European Organization for Nuclear Research (CERN), Geneva, Switzerland and STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 59 European Organization for Nuclear Research (CERN), Geneva, Switzerland and School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 60 Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia.
- 61 AGH-University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland.
- 62 Sezione INFN di Genova, Genova, Italy.
- 63 Sezione INFN di Firenze, Firenze, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 64 Sezione INFN di Milano, Milano, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 65 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
- 66 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.
- 67 Institut für Physik, Universität Rostock, Rostock, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
- 68 Institute for High Energy Physics (IHEP), Protvino, Russia and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 69 European Organization for Nuclear Research (CERN), Geneva, Switzerland and Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.
- 70 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.
- 71 Instituto de Fisica Corpuscular (IFIC), Universitat de Valencia-CSIC, Valencia, Spain (associated with Universitat de Barcelona, Barcelona, Spain).
- 72 School of Physics, University College Dublin, Dublin, Ireland.
- 73 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 74 Sezione INFN di Milano, Milano, Italy.
- 75 Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
- 76 KVI-University of Groningen, Groningen, The Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands).
- 77 Sezione INFN di Bari, Bari, Italy.
- 78 Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany and University of Birmingham, Birmingham, United Kingdom.
- 79 Celal Bayar University, Manisa, Turkey (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland).
- 80 Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia and Department of Physics, University of Warwick, Coventry, United Kingdom.
- 81 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia and Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
- 82 Sezione INFN di Ferrara, Ferrara, Italy and NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 83 National Research Centre Kurchatov Institute, Moscow, Russia (associated with Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia).
- 84 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom and Department of Physics, University of Oxford, Oxford, United Kingdom.
- 85 Sezione INFN di Pisa, Pisa, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 86 European Organization for Nuclear Research (CERN), Geneva, Switzerland and Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 87 Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China).
- PMID: 25192090
- DOI: 10.1103/PhysRevLett.113.082003
First measurement of the charge asymmetry in beauty-quark pair production
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 CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France.
- 7 Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
- 8 European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 9 School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 10 Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia.
- 11 Sezione INFN di Roma La Sapienza, Roma, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 12 Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
- 13 Sezione INFN di Padova, Padova, 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, Firenze, Italy.
- 17 Physik-Institut, Universität Zürich, Zürich, Switzerland.
- 18 University of Cincinnati, Cincinnati, Ohio, USA.
- 19 Sezione INFN di Ferrara, Ferrara, Italy.
- 20 University of Maryland, College Park, Maryland, USA.
- 21 School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
- 22 Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
- 23 Institute for High Energy Physics (IHEP), Protvino, Russia.
- 24 Syracuse University, Syracuse, New York, USA.
- 25 Sezione INFN di Roma La Sapienza, Roma, Italy.
- 26 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
- 27 Department of Physics, University of Warwick, Coventry, United Kingdom.
- 28 Universitat de Barcelona, Barcelona, Spain.
- 29 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia.
- 30 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
- 31 National Center for Nuclear Research (NCBJ), Warsaw, Poland.
- 32 Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 33 LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France.
- 34 Sezione INFN di Pisa, Pisa, Italy.
- 35 Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil.
- 36 LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France.
- 37 Laboratori Nazionali dell'INFN di Frascati, Frascati, Italy.
- 38 Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
- 39 University of Birmingham, Birmingham, United Kingdom.
- 40 Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia.
- 41 Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 42 Sezione INFN di Cagliari, Cagliari, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 43 Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands.
- 44 Sezione INFN di Cagliari, Cagliari, Italy.
- 45 Sezione INFN di Milano Bicocca, Milano, Italy.
- 46 Laboratori Nazionali dell'INFN di Frascati, Frascati, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 47 Sezione INFN di Bologna, Bologna, Italy.
- 48 Sezione INFN di Roma Tor Vergata, Roma, Italy.
- 49 Sezione INFN di Genova, Genova, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 50 School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
- 51 Department of Physics, University of Oxford, Oxford, United Kingdom.
- 52 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland and Physik-Institut, Universität Zürich, Zürich, Switzerland.
- 53 Imperial College London, London, United Kingdom.
- 54 Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
- 55 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).
- 56 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 57 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
- 58 European Organization for Nuclear Research (CERN), Geneva, Switzerland and STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 59 European Organization for Nuclear Research (CERN), Geneva, Switzerland and School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 60 Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia.
- 61 AGH-University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland.
- 62 Sezione INFN di Genova, Genova, Italy.
- 63 Sezione INFN di Firenze, Firenze, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 64 Sezione INFN di Milano, Milano, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 65 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
- 66 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.
- 67 Institut für Physik, Universität Rostock, Rostock, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
- 68 Institute for High Energy Physics (IHEP), Protvino, Russia and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 69 European Organization for Nuclear Research (CERN), Geneva, Switzerland and Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.
- 70 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.
- 71 Instituto de Fisica Corpuscular (IFIC), Universitat de Valencia-CSIC, Valencia, Spain (associated with Universitat de Barcelona, Barcelona, Spain).
- 72 School of Physics, University College Dublin, Dublin, Ireland.
- 73 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 74 Sezione INFN di Milano, Milano, Italy.
- 75 Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
- 76 KVI-University of Groningen, Groningen, The Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands).
- 77 Sezione INFN di Bari, Bari, Italy.
- 78 Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany and University of Birmingham, Birmingham, United Kingdom.
- 79 Celal Bayar University, Manisa, Turkey (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland).
- 80 Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia and Department of Physics, University of Warwick, Coventry, United Kingdom.
- 81 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia and Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
- 82 Sezione INFN di Ferrara, Ferrara, Italy and NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 83 National Research Centre Kurchatov Institute, Moscow, Russia (associated with Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia).
- 84 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom and Department of Physics, University of Oxford, Oxford, United Kingdom.
- 85 Sezione INFN di Pisa, Pisa, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 86 European Organization for Nuclear Research (CERN), Geneva, Switzerland and Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 87 Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China).
- PMID: 25192090
- DOI: 10.1103/PhysRevLett.113.082003
Abstract
The difference in the angular distributions between beauty quarks and antiquarks, referred to as the charge asymmetry, is measured for the first time in bb pair production at a hadron collider. The data used correspond to an integrated luminosity of 1.0 fb(-1) collected at 7 TeV center-of-mass energy in proton-proton collisions with the LHCb detector. The measurement is performed in three regions of the invariant mass of the bb system. The results obtained are A(C)(bb))(40<M(bb))<75 GeV/c(2)) = 0.4 ± 0.4 ± 0.3%, A(C)(bb))(75<M(bb)) < 105 GeV/c(2)) = 2.0 ± 0.9 ± 0.6%, A(C)(bb)(M(bb)) > 105 GeV/c(2)) = 1.6 ± 1.7 ± 0.6%, where A(C)(bb)) is defined as the asymmetry in the difference in rapidity between jets formed from the beauty quark and antiquark, where in each case the first uncertainty is statistical and the second systematic. The beauty jets are required to satisfy 2 < η < 4, E(T) >20 GeV, and have an opening angle in the transverse plane Δ ϕ > 2.6 rad. These measurements are consistent with the predictions of the standard model.
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