First observation of top quark production in the forward region
Affiliations
- 1 European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 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 School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 9 Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.
- 10 Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia.
- 11 Imperial College London, London, United Kingdom.
- 12 University of Cincinnati, Cincinnati, Ohio, USA.
- 13 Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
- 14 Sezione INFN di Padova, Padova, Italy.
- 15 LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France.
- 16 Center for High Energy Physics, Tsinghua University, Beijing, China.
- 17 Sezione INFN di Firenze, Firenze, Italy.
- 18 Physik-Institut, Universität Zürich, Zürich, Switzerland.
- 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 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
- 24 Institute for High Energy Physics (IHEP), Protvino, Russia.
- 25 Syracuse University, Syracuse, New York, USA.
- 26 Sezione INFN di Roma La Sapienza, Roma, Italy.
- 27 Department of Physics, University of Warwick, Coventry, United Kingdom.
- 28 Universitat de Barcelona, Barcelona, Spain.
- 29 Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil (associated with Institution Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil).
- 30 National Center for Nuclear Research (NCBJ), Warsaw, Poland.
- 31 Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 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 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia.
- 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 Sezione INFN di Cagliari, Cagliari, Italy.
- 42 Sezione INFN di Milano Bicocca, Milano, Italy.
- 43 Sezione INFN di Bologna, Bologna, Italy.
- 44 Sezione INFN di Roma Tor Vergata, Roma, Italy.
- 45 Sezione INFN di Genova, Genova, Italy.
- 46 School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
- 47 Department of Physics, University of Oxford, Oxford, United Kingdom.
- 48 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
- 49 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
- 50 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 51 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
- 52 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 53 Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia.
- 54 AGH - University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland.
- 55 Sezione INFN di Milano, Milano, Italy.
- 56 Institut für Physik, Universität Rostock, Rostock, Germany (associated with Institution Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
- 57 Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
- 58 Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands.
- 59 National Research Centre Kurchatov Institute, Moscow, Russia (associated with Institution Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia).
- 60 Yandex School of Data Analysis, Moscow, Russia (associated with Institution Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia).
- 61 Instituto de Fisica Corpuscular (IFIC), Universitat de Valencia-CSIC, Valencia, Spain (associated with Institution Universitat de Barcelona, Barcelona, Spain).
- 62 School of Physics, University College Dublin, Dublin, Ireland.
- 63 Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with Institution LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France).
- 64 Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
- 65 Van Swinderen Institute, University of Groningen, Groningen, The Netherlands (associated with Institution Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands).
- 66 Sezione INFN di Bari, Bari, Italy.
- 67 Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China (associated with Institution Center for High Energy Physics, Tsinghua University, Beijing, China).
- PMID: 26406821
- DOI: 10.1103/PhysRevLett.115.112001
First observation of top quark production in the forward region
Authors
Affiliations
- 1 European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 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 School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 9 Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.
- 10 Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia.
- 11 Imperial College London, London, United Kingdom.
- 12 University of Cincinnati, Cincinnati, Ohio, USA.
- 13 Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
- 14 Sezione INFN di Padova, Padova, Italy.
- 15 LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France.
- 16 Center for High Energy Physics, Tsinghua University, Beijing, China.
- 17 Sezione INFN di Firenze, Firenze, Italy.
- 18 Physik-Institut, Universität Zürich, Zürich, Switzerland.
- 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 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
- 24 Institute for High Energy Physics (IHEP), Protvino, Russia.
- 25 Syracuse University, Syracuse, New York, USA.
- 26 Sezione INFN di Roma La Sapienza, Roma, Italy.
- 27 Department of Physics, University of Warwick, Coventry, United Kingdom.
- 28 Universitat de Barcelona, Barcelona, Spain.
- 29 Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil (associated with Institution Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil).
- 30 National Center for Nuclear Research (NCBJ), Warsaw, Poland.
- 31 Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 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 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia.
- 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 Sezione INFN di Cagliari, Cagliari, Italy.
- 42 Sezione INFN di Milano Bicocca, Milano, Italy.
- 43 Sezione INFN di Bologna, Bologna, Italy.
- 44 Sezione INFN di Roma Tor Vergata, Roma, Italy.
- 45 Sezione INFN di Genova, Genova, Italy.
- 46 School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
- 47 Department of Physics, University of Oxford, Oxford, United Kingdom.
- 48 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
- 49 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
- 50 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 51 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
- 52 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 53 Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia.
- 54 AGH - University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland.
- 55 Sezione INFN di Milano, Milano, Italy.
- 56 Institut für Physik, Universität Rostock, Rostock, Germany (associated with Institution Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
- 57 Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
- 58 Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands.
- 59 National Research Centre Kurchatov Institute, Moscow, Russia (associated with Institution Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia).
- 60 Yandex School of Data Analysis, Moscow, Russia (associated with Institution Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia).
- 61 Instituto de Fisica Corpuscular (IFIC), Universitat de Valencia-CSIC, Valencia, Spain (associated with Institution Universitat de Barcelona, Barcelona, Spain).
- 62 School of Physics, University College Dublin, Dublin, Ireland.
- 63 Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with Institution LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France).
- 64 Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
- 65 Van Swinderen Institute, University of Groningen, Groningen, The Netherlands (associated with Institution Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands).
- 66 Sezione INFN di Bari, Bari, Italy.
- 67 Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China (associated with Institution Center for High Energy Physics, Tsinghua University, Beijing, China).
- PMID: 26406821
- DOI: 10.1103/PhysRevLett.115.112001
Abstract
Top quark production in the forward region in proton-proton collisions is observed for the first time. The W+b final state with W→μν is reconstructed using muons with a transverse momentum, p_{T}, larger than 25 GeV in the pseudorapidity range 2.0<η<4.5. The b jets are required to have 50<p_{T}<100 GeV and 2.2<η<4.2, while the transverse component of the sum of the muon and b-jet momenta must satisfy p_{T}>20 GeV. The results are based on data corresponding to integrated luminosities of 1.0 and 2.0 fb^{-1} collected at center-of-mass energies of 7 and 8 TeV by LHCb. The inclusive top quark production cross sections in the fiducial region are σ(top)[7 TeV]=239±53(stat)±33(syst)±24(theory) fb,σ(top)[8 TeV]=289±43(stat)±40(syst)±29(theory) fb.These results, along with the observed differential yields and charge asymmetries, are in agreement with next-to-leading order standard model predictions.