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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
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  • Open Access
  • Published: 12 November 2012

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

  • The ALICE Collaboration,
  • Betty Abelev68,
  • Jaroslav Adam33,
  • Dagmar Adamova73,
  • Andrew Marshall Adare120,
  • Madan Aggarwal77,
  • Gianluca Aglieri Rinella29,
  • Andras Gabor Agocs60,
  • Andrea Agostinelli21,
  • Saul Aguilar Salazar56,
  • Zubayer Ahammed116,
  • Arshad Ahmad13,
  • Nazeer Ahmad13,
  • Sul-Ah Ahn62,
  • Sang Un Ahn63,36,
  • Alexander Akindinov46,
  • Dmitry Aleksandrov88,
  • Bruno Alessandro94,
  • Jose Ruben Alfaro Molina56,
  • Andrea Alici97,9,
  • Anton Alkin2,
  • Erick Jonathan Almaraz Avina56,
  • Johan Alme31,
  • Torsten Alt35,
  • Valerio Altini27,
  • Sedat Altinpinar14,
  • Igor Altsybeev117,
  • Cristian Andrei70,
  • Anton Andronic85,
  • Venelin Anguelov82,
  • Jonas Anielski54,
  • Christopher Daniel Anson15,
  • Tome Anticic86,
  • Federico Antinori93,
  • Pietro Antonioli97,
  • Laurent Bernard Aphecetche102,
  • Harald Appelshauser52,
  • Nicolas Arbor64,
  • Silvia Arcelli21,
  • Andreas Arend52,
  • Nestor Armesto12,
  • Roberta Arnaldi94,
  • Tomas Robert Aronsson120,
  • Ionut Cristian Arsene85,
  • Mesut Arslandok52,
  • Andzhey Asryan117,
  • Andre Augustinus29,
  • Ralf Peter Averbeck85,
  • Terry Awes74,
  • Juha Heikki Aysto37,
  • Mohd Danish Azmi13,
  • Matthias Jakob Bach35,
  • Angela Badala99,
  • Yong Wook Baek63,36,
  • Raphaelle Marie Bailhache52,
  • Renu Bala94,
  • Rinaldo Baldini Ferroli9,
  • Alberto Baldisseri11,
  • Alain Baldit63,
  • Fernando Baltasar Dos Santos Pedrosa29,
  • Jaroslav Ban47,
  • Rama Chandra Baral48,
  • Roberto Barbera23,
  • Francesco Barile27,
  • Gergely Gabor Barnafoldi60,
  • Lee Stuart Barnby90,
  • Valerie Barret63,
  • Jerzy Gustaw Bartke104,
  • Maurizio Basile21,
  • Nicole Bastid63,
  • Sumit Basu116,
  • Bastian Bathen54,
  • Guillaume Batigne102,
  • Boris Batyunya59,
  • Christoph Heinrich Baumann52,
  • Ian Gardner Bearden71,
  • Hans Beck52,
  • Nirbhay Kumar Behera40,
  • Iouri Belikov58,
  • Francesca Bellini21,
  • Rene Bellwied110,
  • Ernesto Belmont-Moreno56,
  • Gyula Bencedi60,
  • Stefania Beole25,
  • Ionela Berceanu70,
  • Alexandru Bercuci70,
  • Yaroslav Berdnikov75,
  • Daniel Berenyi60,
  • Anais Annick Erica Bergognon102,
  • Dario Berzano94,
  • Latchezar Betev29,
  • Anju Bhasin80,
  • Ashok Kumar Bhati77,
  • Jihyun Bhom114,
  • Livio Bianchi25,
  • Nicola Bianchi65,
  • Chiara Bianchin19,
  • Jaroslav Bielcik33,
  • Jana Bielcikova73,
  • Ante Bilandzic72,71,
  • Sandro Bjelogrlic45,
  • F. Blanco7,
  • Francesco Blanco110,
  • Dmitry Blau88,
  • Christoph Blume52,
  • Marco Boccioli29,
  • Nicolas Bock15,
  • Stefan Boettger51,
  • Alexey Bogdanov69,
  • Hans Boggild71,
  • Mikhail Bogolyubsky43,
  • Laszlo Boldizsar60,
  • Marek Bombara34,
  • Julian Book52,
  • Herve Borel11,
  • Alexander Borissov119,
  • Suvendu Nath Bose89,
  • Francesco Bossu25,
  • Michiel Botje72,
  • Bruno Alexandre Boyer42,
  • Ermes Braidot67,
  • Peter Braun-Munzinger85,
  • Marco Bregant102,
  • Timo Gunther Breitner51,
  • Tyler Allen Browning83,
  • Michal Broz32,
  • Rene Brun29,
  • Elena Bruna25,94,
  • Giuseppe Eugenio Bruno27,
  • Dmitry Budnikov87,
  • Henner Buesching52,
  • Stefania Bufalino25,94,
  • Kyrylo Bugaiev2,
  • Oliver Busch82,
  • Edith Zinhle Buthelezi79,
  • Diego Caballero Orduna120,
  • Davide Caffarri19,
  • Xu Cai39,
  • Helen Louise Caines120,
  • Ernesto Calvo Villar91,
  • Paolo Camerini20,
  • Veronica Canoa Roman8,1,
  • Giovanni Cara Romeo97,
  • Francesco Carena29,
  • Wisla Carena29,
  • Nelson Carlin Filho107,
  • Federico Carminati29,
  • Camilo Andres Carrillo Montoya29,
  • Amaya Ofelia Casanova Diaz65,
  • Javier Ernesto Castillo Castellanos11,
  • Juan Francisco Castillo Hernandez85,
  • Ester Anna Rita Casula18,
  • Vasile Catanescu70,
  • Costanza Cavicchioli29,
  • Cesar Ceballos Sanchez6,
  • Jan Cepila33,
  • Piergiorgio Cerello94,
  • Beomsu Chang37,123,
  • Sylvain Chapeland29,
  • Jean-Luc Fernand Charvet11,
  • Subhasis Chattopadhyay116,
  • Sukalyan Chattopadhyay89,
  • Isha Chawla77,
  • Michael Gerard Cherney76,
  • Cvetan Cheshkov29,109,
  • Brigitte Cheynis109,
  • Vasco Miguel Chibante Barroso29,
  • David Chinellato108,
  • Peter Chochula29,
  • Marek Chojnacki45,
  • Subikash Choudhury116,
  • Panagiotis Christakoglou72,45,
  • Christian Holm Christensen71,
  • Peter Christiansen28,
  • Tatsuya Chujo114,
  • Suh-Urk Chung84,
  • Corrado Cicalo96,
  • Luisa Cifarelli21,29,9,
  • Federico Cindolo97,
  • Jean Willy Andre Cleymans79,
  • Fabrizio Coccetti9,
  • Fabio Colamaria27,
  • Domenico Colella27,
  • Gustavo Conesa Balbastre64,
  • Zaida Conesa del Valle29,
  • Paul Constantin82,
  • Giacomo Contin20,
  • Jesus Guillermo Contreras8,
  • Thomas Michael Cormier119,
  • Yasser Corrales Morales25,
  • Pietro Cortese26,
  • Ismael Cortes Maldonado1,
  • Mauro Rogerio Cosentino67,
  • Filippo Costa29,
  • Manuel Enrique Cotallo7,
  • Elisabetta Crescio8,
  • Philippe Crochet63,
  • Emilia Cruz Alaniz56,
  • Eleazar Cuautle55,
  • Leticia Cunqueiro65,
  • Andrea Dainese19,93,
  • Hans Hjersing Dalsgaard71,
  • Andrea Danu50,
  • Debasish Das89,
  • Indranil Das42,
  • Kushal Das89,
  • Sadhana Dash40,
  • Ajay Kumar Dash108,
  • Sudipan De116,
  • Gabriel de Barros107,
  • Annalisa De Caro24,9,
  • Giacinto de Cataldo98,
  • Jan de Cuveland35,
  • Alessandro De Falco18,
  • Daniele De Gruttola24,
  • Hugues Delagrange102,
  • Andrzej Deloff100,
  • Vyacheslav Demanov87,
  • Nora De Marco94,
  • Ervin Denes60,
  • Salvatore De Pasquale24,
  • Airton Deppman107,
  • Ginevra D’Erasmo27,
  • Raoul Stefan de Rooij45,
  • Miguel Angel Diaz Corchero7,
  • Domenico Di Bari27,
  • Carmelo Di Giglio27,
  • Thomas Dietel54,
  • Sergio Di Liberto95,
  • Antonio Di Mauro29,
  • Pasquale Di Nezza65,
  • Roberto Divia29,
  • Oeystein Djuvsland14,
  • Alexandru Florin Dobrin119,28,
  • Tadeusz Antoni Dobrowolski100,
  • Isabel Dominguez55,
  • Benjamin Donigus85,
  • Olja Dordic17,
  • Olga Driga102,
  • Anand Kumar Dubey116,
  • Laurent Ducroux109,
  • Pascal Dupieux63,
  • Mihir Ranjan Dutta Majumdar116,
  • A. K. Dutta Majumdar89,
  • Domenico Elia98,
  • David Philip Emschermann54,
  • Heiko Engel51,
  • Hege Austrheim Erdal31,
  • Bruno Espagnon42,
  • Magali Danielle Estienne102,
  • Shinichi Esumi114,
  • David Evans90,
  • Gyulnara Eyyubova17,
  • Daniela Fabris19,93,
  • Julien Faivre64,
  • Davide Falchieri21,
  • Alessandra Fantoni65,
  • Markus Fasel85,
  • Roger Worsley Fearick79,
  • Anatoly Fedunov59,
  • Dominik Fehlker14,
  • Linus Feldkamp54,
  • Daniel Felea50,
  • Bo Fenton-Olsen67,
  • Grigory Feofilov117,
  • Arturo Fernandez Tellez1,
  • Alessandro Ferretti25,
  • Roberta Ferretti26,
  • Jan Figiel104,
  • Marcel Figueredo107,
  • Sergey Filchagin87,
  • Dmitry Finogeev44,
  • Fiorella Fionda27,
  • Enrichetta Maria Fiore27,
  • Michele Floris29,
  • Siegfried Valentin Foertsch79,
  • Panagiota Foka85,
  • Sergey Fokin88,
  • Enrico Fragiacomo92,
  • Ulrich Michael Frankenfeld85,
  • Ulrich Fuchs29,
  • Christophe Furget64,
  • Mario Fusco Girard24,
  • Jens Joergen Gaardhoje71,
  • Martino Gagliardi25,
  • Alberto Gago91,
  • Mauro Gallio25,
  • Dhevan Raja Gangadharan15,
  • Paraskevi Ganoti74,
  • Jose Garabatos85,
  • Edmundo Garcia-Solis10,
  • Irakli Garishvili68,
  • Jochen Gerhard35,
  • Marie Germain102,
  • Claudio Geuna11,
  • Andrei George Gheata29,
  • Mihaela Gheata50,29,
  • Bruno Ghidini27,
  • Premomoy Ghosh116,
  • Paola Gianotti65,
  • Martin Robert Girard118,
  • Paolo Giubellino29,
  • Ewa Gladysz-Dziadus104,
  • Peter Glassel82,
  • Ramon Gomez106,
  • Alexey Gonschior85,
  • Elena Gonzalez Ferreiro12,
  • Laura Helena Gonzalez-Trueba56,
  • Pedro Gonzalez-Zamora7,
  • Sergey Gorbunov35,
  • Ankita Goswami81,
  • Sven Gotovac103,
  • Varlen Grabski56,
  • Lukasz Kamil Graczykowski118,
  • Robert Grajcarek82,
  • Alessandro Grelli45,
  • Costin Grigoras29,
  • Alina Gabriela Grigoras29,
  • Vladislav Grigoriev69,
  • Ara Grigoryan121,
  • Smbat Grigoryan59,
  • Boris Grinyov2,
  • Nevio Grion92,
  • Philippe Gros28,
  • Jan Fiete Grosse-Oetringhaus29,
  • Jean-Yves Grossiord109,
  • Raffaele Grosso29,
  • Fedor Guber44,
  • Rachid Guernane64,
  • Cesar Guerra Gutierrez91,
  • Barbara Guerzoni21,
  • Maxime Rene Joseph Guilbaud109,
  • Kristjan Herlache Gulbrandsen71,
  • Taku Gunji113,
  • Anik Gupta80,
  • Ramni Gupta80,
  • Hans Gutbrod85,
  • Oystein Senneset Haaland14,
  • Cynthia Marie Hadjidakis42,
  • Maria Haiduc50,
  • Hideki Hamagaki113,
  • Gergoe Hamar60,
  • Byounghee Han16,
  • Luke David Hanratty90,
  • Alexander Hansen71,
  • Zuzana Harmanova34,
  • John William Harris120,
  • Matthias Hartig52,
  • Dumitru Hasegan50,
  • Despoina Hatzifotiadou97,
  • Arsen Hayrapetyan29,121,
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  • Alexei Pavlinov119,
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  • Thomas Peitzmann45,
  • Hugo Denis Antonio Pereira Da Costa11,
  • Elienos Pereira De Oliveira Filho107,
  • Dmitri Peresunko88,
  • Carlos Eugenio Perez Lara72,
  • Edgar Perez Lezama55,
  • Diego Perini29,
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  • Vladimir Peskov29,55,
  • Yury Pestov3,
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  • Plamen Rumenov Petrov90,
  • Mihai Petrovici70,
  • Catia Petta23,
  • Stefano Piano92,
  • Anna Piccotti94,
  • Miroslav Pikna32,
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  • Ombretta Pinazza29,
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  • Jan Marian Pluta118,
  • Timur Pocheptsov59,
  • Sona Pochybova60,
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  • Amalia Pop70,
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  • Sidharth Kumar Prasad119,
  • Roberto Preghenella97,9,
  • Francesco Prino94,
  • Claude Andre Pruneau119,
  • Igor Pshenichnov44,
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Journal of High Energy Physics volume 2012, Article number: 65 (2012) Cite this article

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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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