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Measurement of prompt J/ψ and beauty hadron production cross sections at mid-rapidity in pp collisions at \( \sqrt{s}=7 \) TeV

Journal of High Energy Physics volume 2012, Article number: 65 (2012) Cite this article

Abstract

The ALICE experiment at the LHC has studied J/ψ production at mid-rapidity in pp collisions at \( \sqrt{s}=7 \) TeV through its electron pair decay on a data sample corresponding to an integrated luminosity L int = 5.6 nb−1. The fraction of J/ψ from the decay of long-lived beauty hadrons was determined for J/ψ candidates with transverse momentum p t > 1.3 GeV/c and rapidity |y| < 0.9. The cross section for prompt J/ψ mesons, i.e. directly produced J/ψ and prompt decays of heavier charmonium states such as the ψ(2S) and χc resonances, is σprompt J/ψ (p t > 1.3 GeV/c, |y| < 0.9) = 8.3 ± 0.8 (stat.) ± 1.1 (syst.) \( _{-1.4}^{+1.5 } \) (syst. pol.) μb. The cross section for the production of b-hadrons decaying to J/ψ with p t > 1.3 GeV/c and |y| < 0.9 is \( {\sigma_{{{J \left/ {{\psi \leftarrow {{\mathrm{h}}_{\mathrm{B}}}}} \right.}}}} \) (p t > 1.3 GeV/c, |y| < 0.9) = 1.46 ± 0.38 (stat.) \( _{-0.32}^{+0.26 } \) (syst.) μb. The results are compared to QCD model predictions. The shape of the p t and y distributions of b-quarks predicted by perturbative QCD model calculations are used to extrapolate the measured cross section to derive the \( \mathrm{b}\overline{\mathrm{b}} \) pair total cross section and dσ/dy at mid-rapidity.

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  1. Benemérita Universidad Autónoma de Puebla, Puebla, Mexico

    Veronica Canoa Roman, Ismael Cortes Maldonado, Arturo Fernandez Tellez, Mario Ivan Martinez, Mario Rodriguez Cahuantzi, Guillermo Tejeda Munoz, Aurora Diozcora Vargas & Sergio Vergara

  2. Bogolyubov Institute for Theoretical Physics, Kiev, Ukraine

    Anton Alkin, Kyrylo Bugaiev, Boris Grinyov, Oleksii Ivanytskyi, Yevgen Martynov, Gennady Zinovjev & Mykhaylo Zynovyev

  3. Budker Institute for Nuclear Physics, Novosibirsk, Russia

    Yury Pestov

  4. California Polytechnic State University, San Luis Obispo, California, United States

    Jennifer Lynn Klay

  5. Centre de Calcul de l’IN2P3, Villeurbanne, France

    Renaud Vernet

  6. Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Havana, Cuba

    Cesar Ceballos Sanchez, Ernesto Lopez Torres & Katherin Shtejer

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  41. Indian Institute of Technology Indore (IIT), Indore, India

    Raghunath Sahoo

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  43. Institute for High Energy Physics, Protvino, Russia

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    Dmitry Finogeev, Fedor Guber, Oleg Karavichev, Tatiana Karavicheva, Evgeny Karpechev, Artem Konevskih, A. B. Kurepin, A. Kurepin, Alla Maevskaya, Igor Pshenichnov & Andrey Reshetin

  45. Nikhef, National Institute for Subatomic Physics and Institute for Subatomic Physics of Utrecht University, Utrecht, Netherlands

    Sandro Bjelogrlic, Marek Chojnacki, Panagiotis Christakoglou, Raoul Stefan de Rooij, Alessandro Grelli, Sarah Louise La Pointe, Grazia Luparello, Andre Mischke, Gerardus Nooren, Thomas Peitzmann, Martijn Reicher, Raimond Snellings, Deepa Thomas, Marco van Leeuwen, Misha Veldhoen, Marta Verweij & You Zhou

  46. Institute for Theoretical and Experimental Physics, Moscow, Russia

    Alexander Akindinov, Alexei Kaidalov, Sergey Kiselev, Dmitry Mal’Kevich, Alexander Nedosekin, Rishat Sultanov & Kirill Voloshin

  47. Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovakia

    Jaroslav Ban, Peter Kalinak, Ivan Kralik, Marian Krivda, Blahoslav Pastircak, Ladislav Sandor & Martin Vala

  48. Institute of Physics, Bhubaneswar, India

    Rama Chandra Baral, Durga Prasad Mahapatra & Pradip Kumar Sahu

  49. Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic

    Jiri Mares, Karel Polak & Petr Zavada

  50. Institute of Space Sciences (ISS), Bucharest, Romania

    Andrea Danu, Daniel Felea, Mihaela Gheata, Maria Haiduc, Dumitru Hasegan, Ciprian Mihai Mitu, Mihai Niculescu, Adrian Sevcenco, Ionel Stan, Ionel Stan & Sorin Ion Zgura

  51. Institut für Informatik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany

    Stefan Boettger, Timo Gunther Breitner, Heiko Engel, Udo Wolfgang Kebschull, Camilo Ernesto Lara, Jordi Pujol Teixido, Jochen Ulrich & Pierre Zelnicek

  52. Institut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany

    Harald Appelshauser, Andreas Arend, Mesut Arslandok, Raphaelle Marie Bailhache, Christoph Heinrich Baumann, Hans Beck, Christoph Blume, Julian Book, Henner Buesching, Matthias Hartig, Stefan Thomas Heckel, Michael Kliemant, Frederick Kramer, Igor Kulakov, Joerg Walter Lehnert, Hermes Leon Vargas, Philipp Luettig, Nora Pitz, Bogdan Theodor Rascanu, Patrick Reichelt, Rainer Arno Ernst Renfordt, Simone Schuchmann, Jason Glyndwr Ulery, Weilin Yu & Maksym Zyzak

  53. Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany

    Alexander Philipp Kalweit, Magnus Mager & Helmut Oskar Oeschler

  54. Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Münster, Germany

    Jonas Anielski, Bastian Bathen, Thomas Dietel, David Philip Emschermann, Linus Feldkamp, Markus Ansgar Heide, Christian Klein-Bosing, Annika Passfeld, Rainer Santo, Johannes Wessels, Uwe Westerhoff, Martin Rudolf Wilde & Alexander Wilk

  55. Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Mexico City, Mexico

    Eleazar Cuautle, Isabel Dominguez, Raul Tonatiuh Jimenez Bustamante, Pedro Ladron de Guevara, Ivonne Alicia Maldonado Cervantes, Daniel Mayani, Antonio Ortiz Velasquez, Guy Paic, Edgar Perez Lezama, Vladimir Peskov & Goran Simatovic

  56. Instituto de Física, Universidad Nacional Autónoma de México, Mexico City, Mexico

    Saul Aguilar Salazar, Jose Ruben Alfaro Molina, Erick Jonathan Almaraz Avina, Ernesto Belmont-Moreno, Emilia Cruz Alaniz, Laura Helena Gonzalez-Trueba, Varlen Grabski, Hermes Leon, Arnulfo Martinez Davalos, Arturo Alejandro Menchaca-Rocha, Andres Sandoval & Eulogio Serradilla

  57. Institut of Theoretical Physics, University of Wroclaw, Wroclaw, Poland

    Krzysztof Redlich

  58. Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg, CNRS-IN2P3, Strasbourg, France

    Iouri Belikov, Boris Hippolyte, Swensy Gwladys Jangal, Christian Claude Kuhn, Christelle Sophie Roy, Xitzel Sanchez Castro, Serhiy Senyukov & Renzhuo Wan

  59. Joint Institute for Nuclear Research (JINR), Dubna, Russia

    Boris Batyunya, Anatoly Fedunov, Smbat Grigoryan, Ludmila Malinina, Petr Nomokonov, Timur Pocheptsov, Galina Shabratova, Martin Vala, Alexander Vodopianov & Sergey Zaporozhets

  60. KFKI Research Institute for Particle and Nuclear Physics, Hungarian Academy of Sciences, Budapest, Hungary

    Andras Gabor Agocs, Gergely Gabor Barnafoldi, Gyula Bencedi, Daniel Berenyi, Laszlo Boldizsar, Ervin Denes, Gergoe Hamar, Peter Levai & Sona Pochybova

  61. Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany

    Jochen Ulrich

  62. Korea Institute of Science and Technology Information, Daejeon, South Korea

    Sul-Ah Ahn & Haeng Jin Jang

  63. Laboratoire de Physique Corpusculaire (LPC), Clermont Université, Université Blaise Pascal, CNRS-IN2P3, Clermont-Ferrand, France

    Sang Un Ahn, Yong Wook Baek, Alain Baldit, Valerie Barret, Nicole Bastid, Philippe Crochet, Pascal Dupieux, Raphaelle Ichou, Xavier Bernard Lopez, Franck Manso, Massimiliano Marchisone, Sarah Porteboeuf-Houssais, Philippe Rosnet, Bogdan Vulpescu & Xiaoming Zhang

  64. Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier, CNRS-IN2P3, Institut Polytechnique de Grenoble, Grenoble, France

    Nicolas Arbor, Gustavo Conesa Balbastre, Julien Faivre, Christophe Furget, Rachid Guernane, Serge Kox, Jean-Sebastien Real & Catherine Silvestre

  65. Laboratori Nazionali di Frascati, INFN, Frascati, Italy

    Nicola Bianchi, Amaya Ofelia Casanova Diaz, Leticia Cunqueiro, Pasquale Di Nezza, Alessandra Fantoni, Paola Gianotti, Valeria Muccifora, Anna Rita Reolon & Federico Ronchetti

  66. Laboratori Nazionali di Legnaro, INFN, Legnaro, Italy

    Renato Angelo Ricci & Luigi Vannucci

  67. Lawrence Berkeley National Laboratory, Berkeley, California, United States

    Ermes Braidot, Mauro Rogerio Cosentino, Bo Fenton-Olsen, Peter Jacobs, Constantinos Loizides, Mateusz Andrzej Ploskon & Shingo Sakai

  68. Lawrence Livermore National Laboratory, Livermore, California, United States

    Betty Abelev, Irakli Garishvili & Ron Ariel Soltz

  69. Moscow Engineering Physics Institute, Moscow, Russia

    Alexey Bogdanov, Vladislav Grigoriev, Vladimir Kaplin, Natalia Kondratyeva & Vitaly Loginov

  70. National Institute for Physics and Nuclear Engineering, Bucharest, Romania

    Cristian Andrei, Ionela Berceanu, Alexandru Bercuci, Vasile Catanescu, Andrei Ionut Herghelegiu, Mariana Petris, Mihai Petrovici, Amalia Pop & Claudiu Cornel Schiaua

  71. Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark

    Ian Gardner Bearden, Ante Bilandzic, Hans Boggild, Christian Holm Christensen, Hans Hjersing Dalsgaard, Jens Joergen Gaardhoje, Kristjan Herlache Gulbrandsen, Alexander Hansen, Borge Svane Nielsen, Casper Nygaard & Carsten Sogaard

  72. Nikhef, National Institute for Subatomic Physics, Amsterdam, Netherlands

    Ante Bilandzic, Michiel Botje, Panagiotis Christakoglou, Paul Kuijer, Carlos Eugenio Perez Lara, Alis Rodriguez Manso & Naomi van der Kolk

  73. Nuclear Physics Institute, Academy of Sciences of the Czech Republic, Řež u Prahy, Czech Republic

    Dagmar Adamova, Jana Bielcikova, Vasily Kushpil, Svetlana Kushpil, Michal Sumbera & Michal Vajzer

  74. Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States

    Terry Awes, Paraskevi Ganoti & David Olle Rickard Silvermyr

  75. Petersburg Nuclear Physics Institute, Gatchina, Russia

    Yaroslav Berdnikov, Vladimir Ivanov, Alexei Khanzadeev, Evgeny Kryshen, Mikhail Malaev, Vladimir Nikulin, Vladimir Samsonov & Mikhail Zhalov

  76. Physics Department, Creighton University, Omaha, Nebraska, United States

    Michael Gerard Cherney & Bjorn Steven Nilsen

  77. Physics Department, Panjab University, Chandigarh, India

    Madan Aggarwal, Ashok Kumar Bhati, Isha Chawla, Deepika Rathee & Natasha Sharma

  78. Physics Department, University of Athens, Athens, Greece

    Martha Spyropoulou-Stassinaki & Maria Vasileiou

  79. Physics Department, University of Cape Town, iThemba LABS, Cape Town, South Africa

    Edith Zinhle Buthelezi, Jean Willy Andre Cleymans, Roger Worsley Fearick, Siegfried Valentin Foertsch, Gideon Francois Steyn & Zabulon Vilakazi

  80. Physics Department, University of Jammu, Jammu, India

    Anju Bhasin, Anik Gupta, Ramni Gupta, Lalit Kumar Mangotra, Baba Potukuchi, Sanjeev Singh Sambyal, Satish Sharma, Rohini Sharma & Ranbir Singh

  81. Physics Department, University of Rajasthan, Jaipur, India

    Ankita Goswami, Aditya Nath Mishra, Sudhir Raniwala & Rashmi Raniwala

  82. Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany

    Venelin Anguelov, Oliver Busch, Paul Constantin, Peter Glassel, Robert Grajcarek, Norbert Herrmann, Jochen Klein, Kathrin Koch, Tobias Krawutschke, Min Jung Kweon, Daniel Lohner, Xianguo Lu, Antonin Maire, Jorge Mercado Perez, Ken Oyama, Yvonne Chiara Pachmayer, Sylwester Radomski, Klaus Johannes Reygers, Rainer Martin Schicker, Kai Oliver Schweda, Johanna Stachel, Johannes Hendrik Stiller, Sara Vallero, Yifei Wang, Bernd Stefan Windelband & Alice Zimmermann

  83. Purdue University, West Lafayette, Indiana, United States

    Tyler Allen Browning, Rolf Paul Scharenberg & Brijesh Kumar Srivastava

  84. Pusan National University, Pusan, South Korea

    Suh-Urk Chung, Jeewon Seo, Jihye Song, JunGyu Yi & In-Kwon Yoo

  85. Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany

    Anton Andronic, Ionut Cristian Arsene, Ralf Peter Averbeck, Peter Braun-Munzinger, Juan Francisco Castillo Hernandez, Benjamin Donigus, Markus Fasel, Panagiota Foka, Ulrich Michael Frankenfeld, Jose Garabatos, Alexey Gonschior, Hans Gutbrod, Cristian George Ivan, Marian Ivanov, Michael Linus Knichel, Markus Kohler, Ingrid Christine Kraus, Mikolaj Krzewicki, Christian Lippmann, Peter Malzacher, Ana Maria Marin, Silvia Masciocchi, Dariusz Miskowiec, Jacek Tomasz Otwinowski, Woo Jin Park, Rosa Romita, Christian Joachim Schmidt, Kilian Eberhard Schwarz, Kai Oliver Schweda, Ilya Selioujenkov, Jochen Mathias Thader & Danilo Vranic

  86. Rudjer Bošković Institute, Zagreb, Croatia

    Tome Anticic, Vedran Nikolic, Goran Simatovic & Tatjana Susa

  87. Russian Federal Nuclear Center (VNIIEF), Sarov, Russia

    Dmitry Budnikov, Vyacheslav Demanov, Sergey Filchagin, Radiy Ilkaev, Andrey Korneev, Alexey Kuryakin, Alexander Mamonov, Nikolay Naumov, Sergey Nazarenko, Gleb Nazarov, Sergey Puchagin, Valery Punin, Kirill Strabykin, Mikhail Sukhorukov, Alexandr Tumkin, Oleg Vikhlyantsev, Yury Vinogradov, Alexey Vyushin & Nikolai Zaviyalov

  88. Russian Research Centre Kurchatov Institute, Moscow, Russia

    Dmitry Aleksandrov, Dmitry Blau, Sergey Fokin, Mikhail Ippolitov, Andrey Kazantsev, Yury Kucheriaev, Vladislav Manko, Sergey Nikolaev, Sergey Nikulin, Alexandre Nyanin, Dmitri Peresunko, Evgeny Ryabinkin, Yury Sibiriak, Andrey Vasiliev, Alexander Vinogradov, Stanislav Yasnopolsky & Igor Yushmanov

  89. Saha Institute of Nuclear Physics, Kolkata, India

    Suvendu Nath Bose, Sukalyan Chattopadhyay, Debasish Das, Kushal Das, A. K. Dutta Majumdar, Palash Khan, Pradip Kumar Roy & Tinku Sinha

  90. School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom

    Lee Stuart Barnby, David Evans, Luke David Hanratty, Peter Graham Jones, Anton Jusko, Ravjeet Kour, Marian Krivda, Cristina Lazzeroni, Graham Richard Lee, Roman Lietava, Zoe Louise Matthews, Sparsh Navin, Arvinder Singh Palaha, Plamen Rumenov Petrov, Patrick Aaron Scott & Orlando Villalobos Baillie

  91. Sección Física, Departamento de Ciencias, Pontificia Universidad Católica del Perú, Lima, Peru

    Ernesto Calvo Villar, Alberto Gago & Cesar Guerra Gutierrez

  92. Sezione INFN, Trieste, Italy

    Enrico Fragiacomo, Nevio Grion, Giacomo Vito Margagliotti, Stefano Piano & Alexandre Rachevski

  93. Sezione INFN, Padova, Italy

    Federico Antinori, Andrea Dainese, Daniela Fabris & Rosario Turrisi

  94. Sezione INFN, Turin, Italy

    Bruno Alessandro, Roberta Arnaldi, Renu Bala, Dario Berzano, Elena Bruna, Stefania Bufalino, Piergiorgio Cerello, Nora De Marco, Marco Leoncino, Loic Henri Antoine Manceau, Marco Monteno, Alfredo Musso, Chiara Oppedisano, Anna Piccotti, Francesco Prino, Lodovico Riccati, Enrico Scomparin & Luca Toscano

  95. Sezione INFN, Rome, Italy

    Sergio Di Liberto, Alessandra Maria Mazzoni & Guido Marie Urciuoli

  96. Sezione INFN, Cagliari, Italy

    Corrado Cicalo, Alberto Masoni & Sabyasachi Siddhanta

  97. Sezione INFN, Bologna, Italy

    Andrea Alici, Pietro Antonioli, Giovanni Cara Romeo, Federico Cindolo, Despoina Hatzifotiadou, Anselmo Margotti, Rosario Nania, Francesco Noferini, Alessandro Pesci, Roberto Preghenella, Eugenio Scapparone, Crispin Williams & Chiara Zampolli

  98. Sezione INFN, Bari, Italy

    Giacinto de Cataldo, Domenico Elia, Vito Lenti, Vito Manzari, Mario Mastromarco, Eugenio Nappi, Vincenzo Paticchio & Romualdo Santoro

  99. Sezione INFN, Catania, Italy

    Angela Badala, Armando Palmeri, Giuseppe Pappalardo & Francesco Riggi

  100. Soltan Institute for Nuclear Studies, Warsaw, Poland

    Andrzej Deloff, Tadeusz Antoni Dobrowolski, Iryna Ilkiv, Podist Kurashvili, Krzysztof Redlich, Teodor Siemiarczuk, Grzegorz Stefanek & Grzegorz Andrzej Wilk

  101. SUBATECH, Ecole des Mines de Nantes, Université de Nantes, CNRS-IN2P3, Nantes, France

    Laurent Bernard Aphecetche, Guillaume Batigne, Anais Annick Erica Bergognon, Marco Bregant, Hugues Delagrange, Olga Driga, Magali Danielle Estienne, Marie Germain, Antoine Xavier Lardeux, Frederic Lefevre, Matthieu Laurent Lenhardt, Lionel Luquin, Gines Martinez Garcia, Alexis Jean-Michel Mas, Laure Marie Massacrier, Adam Tomas