Underlying event measurements in pp collisions at √s = 0:9 and 7 TeV with the ALICE experiment at the LHC

Betty Abelev, Arian Abrahantes Quintana, Dagmar Adamova, Andrew Marshall Adare, Madan Aggarwal, Gianluca Aglieri Rinella, Andras Gabor Agocs, Andrea Agostinelli, Saul Aguilar Salazar, Zubayer Ahammed, Nazeer Ahmad, Arshad Ahmad, Sang Un Ahn, Alexander Akindinov, Dmitry Aleksandrov, Bruno Alessandro, Jose Ruben Alfaro Molina, Andrea Alici, Anton Alkin, Erick Jonathan Almaraz AvinaTorsten Alt, Valerio Altini, Sedat Altinpinar, Igor Altsybeev, Cristian Andrei, Anton Andronic, Venelin Anguelov, Christopher Daniel Anson, Tome Anticic, Federico Antinori, Pietro Antonioli, Laurent Bernard Aphecetche, Harald Appelshauser, Nicolas Arbor, Silvia Arcelli, Andreas Arend, Nestor Armesto, Roberta Arnaldi, Tomas Robert Aronsson, Ionut Cristian Arsene, Mesut Arslandok, Andzhey Asryan, Andre Augustinus, Ralf Peter Averbeck, Terry Awes, Juha Heikki Aysto, Mohd Danish Azmi, Matthias Jakob Bach, Angela Badala, Yong Wook Baek, Raphaelle Marie Bailhache, Renu Bala, Rinaldo Baldini Ferroli, Alberto Baldisseri, Alain Baldit, Fernando Baltasar Dos Santos Pedrosa, Jaroslav Ban, Rama Chandra Baral, Roberto Barbera, Francesco Barile, Gergely Gabor Barnafoldi, Lee Stuart Barnby, Valerie Barret, Jerzy Gustaw Bartke, Maurizio Basile, Nicole Bastid, Bastian Bathen, Guillaume Batigne, Boris Batyunya, Christoph Heinrich Baumann, Ian Gardner Bearden, Hans Beck, Iouri Belikov, Francesca Bellini, Rene Bellwied, Ernesto Belmont-Moreno, Stefania Beole, Ionela Berceanu, Alexandru Bercuci, Yaroslav Berdnikov, Daniel Berenyi, Cyrano Bergmann, Dario Berzano, Latchezar Betev, Anju Bhasin, Ashok Kumar Bhati, Nicola Bianchi, Livio Bianchi, Chiara Bianchin, Jaroslav Bielcik, Jana Bielcikova, Ante Bilandzic, F. Blanco, Francesco Blanco, Dmitry Blau, Christoph Blume, Marco Boccioli, Nicolas Bock, Alexey Bogdanov, Hans Boggild, Mikhail Bogolyubsky, Laszlo Boldizsar, Marek Bombara, Julian Book, Herve Borel, Alexander Borissov, Claudio Bortolin, Suvendu Nath Bose, Francesco Bossu, Michiel Botje, Stefan Bottger, Bruno Alexandre Boyer, Peter Braun-Munzinger, Marco Bregant, Timo Gunther Breitner, Michal Broz, Rene Brun, Elena Bruna, Giuseppe Eugenio Bruno, Dmitry Budnikov, Henner Buesching, Stefania Bufalino, Kyrylo Bugaiev, Oliver Busch, Edith Zinhle Buthelezi, Davide Caffarri, Xu Cai, Helen Louise Caines, Ernesto Calvo Villar, Paolo Camerini, Veronica Canoa Roman, Giovanni Cara Romeo, Francesco Carena, Wisla Carena, Nelson Carlin Filho, Federico Carminati, Camilo Andres Carrillo Montoya, Amaya Ofelia Casanova Diaz, Michele Caselle, Javier Ernesto Castillo Castellanos, Juan Francisco Castillo Hernandez, Ester Anna Rita Casula, Vasile Catanescu, Costanza Cavicchioli, Jan Cepila, Piergiorgio Cerello, Beomsu Chang, Sylvain Chapeland, Jean Luc Fernand Charvet, Sukalyan Chattopadhyay, Subhasis Chattopadhyay, Michael Gerard Cherney, Cvetan Cheshkov, Brigitte Cheynis, Emilio Chiavassa, Vasco Miguel Chibante Barroso, David Chinellato, Peter Chochula, Marek Chojnacki, Panagiotis Christakoglou, Christian Holm Christensen, Peter Christiansen, Tatsuya Chujo, Suh Urk Chung, Corrado Cicalo, Luisa Cifarelli, Federico Cindolo, Jean Willy Andre Cleymans, Fabrizio Coccetti, Jean Pierre Michel Coffin, Fabio Colamaria, Domenico Colella, Gustavo Conesa Balbastre, Zaida Conesa Del Valle, Paul Constantin, Giacomo Contin, Jesus Guillermo Contreras, Thomas Michael Cormier, Yasser Corrales Morales, Pietro Cortese, Ismael Cortes Maldonado, Mauro Rogerio Cosentino, Filippo Costa, Manuel Enrique Cotallo, Elisabetta Crescio, Philippe Crochet, Emilia Cruz Alaniz, Eleazar Cuautle, Leticia Cunqueiro, Andrea Dainese, Hans Hjersing Dalsgaard, Andrea Danu, Indranil Das, Kushal Das, Debasish Das, Ajay Kumar Dash, Sadhana Dash, Sudipan De, Andrea De Azevedo Moregula, Gabriel De Barros, Annalisa De Caro, Giacinto De Cataldo, Jan De Cuveland, Alessandro De Falco, Daniele De Gruttola, Hugues Delagrange, Eduardo Del Castillo Sanchez, Andrzej Deloff, Vyacheslav Demanov, Nora De Marco, Ervin Denes, Salvatore De Pasquale, Airton Deppman, Ginevra D'Erasmo, Raoul Stefan De Rooij, Domenico Di Bari, Thomas Dietel, Carmelo Di Giglio, Sergio Di Liberto, Antonio Di Mauro, Pasquale Di Nezza, Roberto Divia, Oeystein Djuvsland, Alexandru Florin Dobrin, Tadeusz Antoni Dobrowolski, Isabel Dominguez, Benjamin Donigus, Olja Dordic, Olga Driga, Anand Kumar Dubey, Laurent Ducroux, Pascal Dupieux, Mihir Ranjan Dutta Majumdar, A. K. Dutta Majumdar, Domenico Elia, David Philip Emschermann, Heiko Engel, Hege Austrheim Erdal, Bruno Espagnon, Magali Danielle Estienne, Shinichi Esumi, David Evans, Gyulnara Eyyubova, Daniela Fabris, Julien Faivre, Davide Falchieri, Alessandra Fantoni, Markus Fasel, Roger Worsley Fearick, Anatoly Fedunov, Dominik Fehlker, Linus Feldkamp, Daniel Felea, Grigory Feofilov, Arturo Fernandez Tellez, Alessandro Ferretti, Roberta Ferretti, Jan Figiel, Marcel Figueredo, Sergey Filchagin, Rosa Anna Fini, Dmitry Finogeev, Fiorella Fionda, Enrichetta Maria Fiore, Michele Floris, Siegfried Valentin Foertsch, Panagiota Foka, Sergey Fokin, Enrico Fragiacomo, Michail Fragkiadakis, Ulrich Michael Frankenfeld, Ulrich Fuchs, Christophe Furget, Mario Fusco Girard, Jens Joergen Gaardhoje, Martino Gagliardi, Alberto Gago, Mauro Gallio, Dhevan Raja Gangadharan, Paraskevi Ganoti, Jose Garabatos, Edmundo Garcia-Solis, Irakli Garishvili, Jochen Gerhard, Marie Germain, Claudio Geuna, Andrei George Gheata, Mihaela Gheata, Bruno Ghidini, Premomoy Ghosh, Paola Gianotti, Martin Robert Girard, Paolo Giubellino, Ewa Gladysz-Dziadus, Peter Glassel, Ramon Gomez, Elena Gonzalez Ferreiro, Laura Helena Gonzalez-Trueba, Pedro Gonzalez-Zamora, Sergey Gorbunov, Ankita Goswami, Sven Gotovac, Varlen Grabski, Lukasz Kamil Graczykowski, Robert Grajcarek, Alessandro Grelli, Costin Grigoras, Alina Gabriela Grigoras, Vladislav Grigoriev, Ara Grigoryan, Smbat Grigoryan, Boris Grinyov, Nevio Grion, Philippe Gros, Jan Fiete Grosse-Oetringhaus, Jean Yves Grossiord, Raffaele Grosso, Fedor Guber, Rachid Guernane, Cesar Guerra Gutierrez, Barbara Guerzoni, Maxime Rene Joseph Guilbaud, Kristjan Herlache Gulbrandsen, Taku Gunji, Anik Gupta, Ramni Gupta, Hans Gutbrod, Oystein Senneset Haaland, Cynthia Marie Hadjidakis, Maria Haiduc, Hideki Hamagaki, Gergoe Hamar, Byounghee Han, Luke David Hanratty, Alexander Hansen, Zuzana Harmanova, John William Harris, Matthias Hartig, Dumitru Hasegan, Despoina Hatzifotiadou, Arsen Hayrapetyan, Stefan Thomas Heckel, Markus Ansgar Heide, Haavard Helstrup, Andrei Ionut Herghelegiu, Gerardo Antonio Herrera Corral, Norbert Herrmann, Kristin Fanebust Hetland, Bernard Hicks, Per Thomas Hille, Boris Hippolyte, Takuma Horaguchi, Yasuto Hori, Peter Zahariev Hristov, Ivana Hrivnacova, Meidana Huang, Sebastian Bernd Huber, Thomas Humanic, Dae Sung Hwang, Raphaelle Ichou, Radiy Ilkaev, Iryna Ilkiv, Motoi Inaba, Elisa Incani, Pier Giorgio Innocenti, Gian Michele Innocenti, Mikhail Ippolitov, Muhammad Irfan, Cristian George Ivan, Marian Ivanov, Vladimir Ivanov, Andrey Ivanov, Oleksii Ivanytskyi, Adam Wlodzimierz Jacholkowski, Peter Jacobs, Lucia Jancurova, Haeng Jin Jang, Swensy Gwladys Jangal, Rudolf Janik, Malgorzata Anna Janik, Sandun Jayarathna, Satyajit Jena, Raul Tonatiuh Jimenez Bustamante, Lennart Jirden, Peter Graham Jones, Won Woong Jung, Hyung Taik Jung, Anton Jusko, Alexei Kaidalov, Vanik Kakoyan, Sebastian Kalcher, Peter Kalinak, Matus Kalisky, Tuomo Esa Aukusti Kalliokoski, Alexander Philipp Kalweit, Kalliopi Kanaki, Ju Hwan Kang, Vladimir Kaplin, Ayben Karasu Uysal, Oleg Karavichev, Tatiana Karavicheva, Evgeny Karpechev, Andrey Kazantsev, Udo Wolfgang Kebschull, Ralf Keidel, Palash Khan, Mohisin Mohammed Khan, Shuaib Ahmad Khan, Alexei Khanzadeev, Yury Kharlov, Bjarte Kileng, Jonghyun Kim, Dong Jo Kim, Do Won Kim, Jin Sook Kim, Minwoo Kim, Seon Hee Kim, Se Yong Kim, Beomkyu Kim, Taesoo Kim, Stefan Kirsch, Ivan Kisel, Sergey Kiselev, Adam Ryszard Kisiel, Jennifer Lynn Klay, Jochen Klein, Christian Klein-Bosing, Michael Kliemant, Alexander Kluge, Michael Linus Knichel, Kathrin Koch, Markus Kohler, Anatoly Kolojvari, Valery Kondratiev, Natalia Kondratyeva, Artem Konevskih, Andrey Korneev, Chamath Kottachchi Kankanamge Don, Ravjeet Kour, Marek Kowalski, Serge Kox, Greeshma Koyithatta Meethaleveedu, Jiri Kral, Ivan Kralik, Frederick Kramer, Ingrid Christine Kraus, Tobias Krawutschke, Matthias Kretz, Marian Krivda, Filip Krizek, Miroslav Krus, Evgeny Kryshen, Mikolaj Krzewicki, Yury Kucheriaev, Christian Claude Kuhn, Paul Kuijer, Podist Kurashvili, A. B. Kurepin, A. Kurepin, Alexey Kuryakin, Svetlana Kushpil, Vasily Kushpil, Henning Kvaerno, Min Jung Kweon, Youngil Kwon, Pedro Ladron De Guevara, Igor Lakomov, Rune Langoy, Camilo Ernesto Lara, Antoine Xavier Lardeux, Paola La Rocca, Cristina Lazzeroni, Ramona Lea, Yves Le Bornec, Sung Chul Lee, Ki Sang Lee, Frederic Lefevre, Joerg Walter Lehnert, Lars Leistam, Matthieu Laurent Lenhardt, Vito Lenti, Hermes Leon, Ildefonso Leon Monzon, Hermes Leon Vargas, Peter Levai, Xiaomei Li, Jorgen Lien, Roman Lietava, Svein Lindal, Volker Lindenstruth, Christian Lippmann, Michael Annan Lisa, Lijiao Liu, Per Ivar Loenne, Vera Loggins, Vitaly Loginov, Stefan Bernhard Lohn, Daniel Lohner, Constantinos Loizides, Kai Krister Loo, Xavier Bernard Lopez, Ernesto Lopez Torres, Gunnar Lovhoiden, Xianguo Lu, Philipp Luettig, Marcello Lunardon, Jiebin Luo, Grazia Luparello, Lionel Luquin, Cinzia Luzzi, Rongrong Ma, Ke Ma, Dilan Minthaka Madagodahettige-Don, Alla Maevskaya, Magnus Mager, Durga Prasad Mahapatra, Antonin Maire, Mikhail Malaev, Ivonne Alicia Maldonado Cervantes, Ludmila Malinina, Dmitry Mal'kevich, Peter Malzacher, Alexander Mamonov, Loic Henri Antoine Manceau, Lalit Kumar Mangotra, Vladislav Manko, Franck Manso, Vito Manzari, Yaxian Mao, Massimiliano Marchisone, Jiri Mares, Giacomo Vito Margagliotti, Anselmo Margotti, Ana Maria Marin, Christina Markert, Irakli Martashvili, Paolo Martinengo, Mario Ivan Martinez, Arnulfo Martinez Davalos, Gines Martinez Garcia, Yevgen Martynov, Alexis Jean Michel Mas, Silvia Masciocchi, Massimo Masera, Alberto Masoni, Laure Marie Massacrier, Mario Mastromarco, Annalisa Mastroserio, Zoe Louise Matthews, Adam Tomasz Matyja, Daniel Mayani, Christoph Mayer, Joel Mazer, Alessandra Maria Mazzoni, Franco Meddi, Arturo Alejandro Menchaca-Rocha, Jorge Mercado Perez, Michal Meres, Yasuo Miake, Alain Michalon, Jumpei Midori, Leonardo Milano, Jovan Milosevic, Andre Mischke, Aditya Nath Mishra, Dariusz Miskowiec, Ciprian Mihai Mitu, Jocelyn Mlynarz, Ajit Kumar Mohanty, Bedangadas Mohanty, Levente Molnar, Luis Manuel Montano Zetina, Marco Monteno, Esther Montes, Taebong Moon, Maurizio Morando, Denise Aparecida Moreira De Godoy, Sandra Moretto, Andreas Morsch, Valeria Muccifora, Eugen Mudnic, Sanjib Muhuri, Hans Muller, Marcelo Munhoz, Luciano Musa, Alfredo Musso, Basanta Kumar Nandi, Rosario Nania, Eugenio Nappi, Christine Nattrass, Nikolay Naumov, Sparsh Navin, Tapan Kumar Nayak, Sergey Nazarenko, Gleb Nazarov, Alexander Nedosekin, Maria Nicassio, Borge Svane Nielsen, Takafumi Niida, Sergey Nikolaev, Vedran Nikolic, Vladimir Nikulin, Sergey Nikulin, Bjorn Steven Nilsen, Mads Stormo Nilsson, Francesco Noferini, Petr Nomokonov, Gerardus Nooren, Norbert Novitzky, Alexandre Nyanin, Anitha Nyatha, Casper Nygaard, Joakim Ingemar Nystrand, Hideyuki Obayashi, Alexander Ochirov, Helmut Oskar Oeschler, Sun Kun Oh, Saehanseul Oh, Janusz Oleniacz, Chiara Oppedisano, Antonio Ortiz Velasquez, Giacomo Ortona, Anders Nils Erik Oskarsson, Piotr Krystian Ostrowski, Ingvar Otterlund, Jacek Tomasz Otwinowski, Ken Oyama, Kyoichiro Ozawa, Yvonne Chiara Pachmayer, Milos Pachr, Fatima Padilla, Paola Pagano, Guy Paic, Florian Painke, Carlos Pajares, S. 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Xiangrong Zhu, Antonino Zichichi, Alice Zimmermann, Gennady Zinovjev, Yannick Denis Zoccarato, Mykhaylo Zynovyev

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

We present measurements of Underlying Event observables in pp collisions at √s = 0.9 and 7 TeV. The analysis is performed as a function of the highest charged-particle transverse momentum pT,LTin the event. Different regions are defined with respect to the azimuthal direction of the leading (highest transverse momentum) track: Toward, Transverse and Away. The Toward and Away regions collect the fragmentation products of the hardest partonic interaction. The Transverse region is expected to be most sensitive to the Underlying Event activity. The study is performed with charged particles above three different pTthresholds: 0.15, 0.5 and 1.0 GeV/c. In the Transverse region we observe an increase in the multiplicity of a factor 2-3 between the lower and higher collision energies, depending on the track p Tthreshold considered. Data are compared to PYTHIA 6.4, PYTHIA 8.1 and PHOJET. On average, all models considered underestimate the multiplicity and summed pTin the Transverse region by about 10-30%. Open Access, Copyright CERN, for the benefit of the ALICE collaboration.

Original languageEnglish
Article number116
JournalJournal of High Energy Physics
Volume2012
Issue number7
DOIs
Publication statusPublished - 2012

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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