Underlying Event measurements in pp collisions at root(s) = 0.9 and 7 TeV with the ALICE experiment at the LHC

Abelev, Betty; Arian Abrahantes Quintana,; Adamova, Dagmar; Andrew Marshall Adare,; Aggarwal, Madan; Gianluca Aglieri Rinella,; Andras Gabor Agocs,; Agostinelli, Andrea; Saul Aguilar Salazar,; Ahammed, Zubayer; Ahmad, Nazeer; Ahmad, Arshad; Sang Un Ahn,; Akindinov, Alexander; Aleksandrov, Dmitry; Alessandro, Bruno; Jose Ruben Alfaro Molina,; Alici, Andrea; Alkin, Anton; Erick Jonathan Almaraz Avina,; Alt, Torsten; Altini, Valerio; Altinpinar, Sedat; Altsybeev, Igor; Andrei, Cristian; Andronic, Anton; Anguelov, Venelin; Christopher Daniel Anson,; Anticic, Tome; Antinori, Federico; Antonioli, Pietro; Laurent Bernard Aphecetche,; Appelshauser, Harald; Arbor, Nicolas; Arcelli, Silvia; Arend, Andreas; Armesto, Nestor; Arnaldi, Roberta; Tomas Robert Aronsson,; Ionut Cristian Arsene,; Arslandok, Mesut; Asryan, Andzhey; Augustinus, Andre; Ralf Peter Averbeck,; Awes, Terry; Juha Heikki Aysto,; Mohd Danish Azmi,; Matthias Jakob Bach,; Badala, Angela; Yong Wook Baek,; Raphaelle Marie Bailhache,; Bala, Renu; Rinaldo Baldini Ferroli,; Baldisseri, Alberto; Baldit, Alain; Fernando Baltasar Dos Santos Pedrosa,; Ban, Jaroslav; Rama Chandra Baral,; Barbera, Roberto; Barile, Francesco; Gergely Gabor Barnafoldi,; Lee Stuart Barnby,; Barret, Valerie; Jerzy Gustaw Bartke,; Basile, Maurizio; Bastid, Nicole; Bathen, Bastian; Batigne, Guillaume; Batyunya, Boris; Christoph Heinrich Baumann,; Ian Gardner Bearden,; Beck, Hans; Belikov, Iouri; Bellini, Francesca; Bellwied, Rene; Ernesto Belmont Moreno,; Beole', Stefania; Berceanu, Ionela; Bercuci, Alexandru; Berdnikov, Yaroslav; Berenyi, Daniel; Bergmann, Cyrano; Berzano, Dario; Betev, Latchezar; Bhasin, Anju; Ashok Kumar Bhati,; Bianchi, Nicola; Bianchi, Livio; Bianchin, Chiara; Bielcik, Jaroslav; Bielcikova, Jana; Bilandzic, Ante; Blanco, F.; Blanco, Francesco; Blau, Dmitry; Blume, Christoph; Boccioli, Marco; Bock, Nicolas; Bogdanov, Alexey; Boggild, Hans; Bogolyubsky, Mikhail; Boldizsar, Laszlo; Bombara, Marek; Book, Julian; Borel, Herve; Borissov, Alexander; Bortolin, Claudio; Suvendu Nath Bose,; Bossu, Francesco; Botje, Michiel; Bottger, Stefan; Bruno Alexandre Boyer,; Peter Braun Munzinger,; Bregant, Marco; Timo Gunther Breitner,; Broz, Michal; Brun, Rene; Bruna, Elena; Giuseppe Eugenio Bruno,; Budnikov, Dmitry; Buesching, Henner; Bufalino, Stefania; Bugaiev, Kyrylo; Busch, Oliver; Edith Zinhle Buthelezi,; Caffarri, Davide; Cai, Xu; Helen Louise Caines,; Ernesto Calvo Villar,; Camerini, Paolo; Veronica Canoa Roman,; Giovanni Cara Romeo,; Carena, Francesco; Carena, Wisla; Nelson Carlin Filho,; Carminati, Federico; Camilo Andres Carrillo Montoya,; Amaya Ofelia Casanova Diaz,; Caselle, Michele; Javier Ernesto Castillo Castellanos,; Juan Francisco Castillo Hernandez,; Ester Anna Rita Casula,; Catanescu, Vasile; Cavicchioli, Costanza; Cepila, Jan; Cerello, Piergiorgio; Chang, Beomsu; Chapeland, Sylvain; Jean Luc Fernand Charvet,; Chattopadhyay, Sukalyan; Chattopadhyay, Subhasis; Michael Gerard Cherney,; Cheshkov, Cvetan; Cheynis, Brigitte; Chiavassa, Emilio; Vasco Miguel Chibante Barroso,; Chinellato, David; Chochula, Peter; Chojnacki, Marek; Christakoglou, Panagiotis; Christian Holm Christensen,; Christiansen, Peter; Chujo, Tatsuya; Suh Urk Chung,; Cicalo, Corrado; Cifarelli, Luisa; Cindolo, Federico; Jean Willy Andre Cleymans,; Coccetti, Fabrizio; Jean Pierre Michel Coffin,; Colamaria, Fabio; Colella, Domenico; Gustavo Conesa Balbastre,; Zaida Conesa Valle,; Constantin, Paul; Contin, Giacomo; Jesus Guillermo Contreras,; Thomas Michael Cormier,; CORRALES MORALES, Yasser; Cortese, Pietro; Ismael Cortes Maldonado,; Mauro Rogerio Cosentino,; Costa, Filippo; Manuel Enrique Cotallo,; Crescio, Elisabetta; Crochet, Philippe; Emilia Cruz Alaniz,; Cuautle, Eleazar; Cunqueiro, Leticia; Dainese, Andrea; Hans Hjersing Dalsgaard,; Danu, Andrea; Das, Indranil; Das, Kushal; Das, Debasish; Ajay Kumar Dash,; Dash, Sadhana; Sudipan, De; Andrea Azevedo Moregula,; Barros, Gabriel; Caro, Annalisa; Cataldo, Giacinto; Cuveland, Jan; Falco, Alessandro; Gruttola, Daniele; Delagrange, Hugues; Eduardo Castillo Sanchez,; Deloff, Andrzej; Demanov, Vyacheslav; Marco, Nora; Denes, Ervin; Pasquale, Salvatore; Deppman, Airton; D’Erasmo, Ginevra; Raoul Stefan Rooij,; Bari, Domenico; Dietel, Thomas; Giglio, Carmelo; Liberto, Sergio; Mauro, Antonio; Nezza, Pasquale; Divia, Roberto; Djuvsland, Oeystein; Alexandru Florin Dobrin,; Tadeusz Antoni Dobrowolski,; Dominguez, Isabel; Donigus, Benjamin; Dordic, Olja; Driga, Olga; Anand Kumar Dubey,; Ducroux, Laurent; Dupieux, Pascal; Mihir Ranjan Dutta Majumdar,; Dutta Majumdar, A. K.; Elia, Domenico; David Philip Emschermann,; Engel, Heiko; Hege Austrheim Erdal,; Espagnon, Bruno; Magali Danielle Estienne,; Esumi, Shinichi; Evans, David; Eyyubova, Gyulnara; Fabris, Daniela; Faivre, Julien; Falchieri, Davide; Fantoni, Alessandra; Fasel, Markus; Roger Worsley Fearick,; Fedunov, Anatoly; Fehlker, Dominik; Feldkamp, Linus; Felea, Daniel; Feofilov, Grigory; Arturo Fernandez Tellez,; Ferretti, Alessandro; Ferretti, Roberta; Figiel, Jan; Figueredo, Marcel; Filchagin, Sergey; Rosa Anna Fini,; Finogeev, Dmitry; Fionda, Fiorella; Enrichetta Maria Fiore,; Floris, Michele; Siegfried Valentin Foertsch,; Foka, Panagiota; Fokin, Sergey; Fragiacomo, Enrico; Fragkiadakis, Michail; Ulrich Michael Frankenfeld,; Fuchs, Ulrich; Furget, Christophe; Mario Fusco Girard,; Jens Joergen Gaardhoje,; Gagliardi, Martino; Gago, Alberto; Gallio, Mauro; Dhevan Raja Gangadharan,; Ganoti, Paraskevi; Garabatos, Jose; Edmundo Garcia Solis,; Garishvili, Irakli; Gerhard, Jochen; Germain, Marie; Geuna, Claudio; Andrei George Gheata,; Gheata, Mihaela; Ghidini, Bruno; Ghosh, Premomoy; Gianotti, Paola; Martin Robert Girard,; Giubellino, Paolo; Ewa Gladysz Dziadus,; Glassel, Peter; Gomez, Ramon; Elena Gonzalez Ferreiro,; Laura Helena Gonzalez Trueba,; Pedro Gonzalez Zamora,; Gorbunov, Sergey; Goswami, Ankita; Gotovac, Sven; Grabski, Varlen; Lukasz Kamil Graczykowski,; Grajcarek, Robert; Grelli, Alessandro; Grigoras, Costin; Alina Gabriela Grigoras,; Grigoriev, Vladislav; Grigoryan, Ara; Grigoryan, Smbat; Grinyov, Boris; Grion, Nevio; Gros, Philippe; Jan Fiete Grosse Oetringhaus,; Jean Yves Grossiord,; Grosso, Raffaele; Guber, Fedor; Guernane, Rachid; Cesar Guerra Gutierrez,; Guerzoni, Barbara; Maxime Rene Joseph Guilbaud,; Kristjan Herlache Gulbrandsen,; Gunji, Taku; Gupta, Anik; Gupta, Ramni; Gutbrod, Hans; Oystein Senneset Haaland,; Cynthia Marie Hadjidakis,; Haiduc, Maria; Hamagaki, Hideki; Hamar, Gergoe; Han, Byounghee; Luke David Hanratty,; Hansen, Alexander; Harmanova, Zuzana; John William Harris,; Hartig, Matthias; Hasegan, Dumitru; Hatzifotiadou, Despoina; Hayrapetyan, Arsen; Stefan Thomas Heckel,; Markus Ansgar Heide,; Helstrup, Haavard; Andrei Ionut Herghelegiu,; Gerardo Antonio Herrera Corral,; Herrmann, Norbert; Kristin Fanebust Hetland,; Hicks, Bernard; Per Thomas Hille,; Hippolyte, Boris; Horaguchi, Takuma; Hori, Yasuto; Peter Zahariev Hristov,; Hrivnacova, Ivana; Huang, Meidana; Sebastian Bernd Huber,; Humanic, Thomas; Dae Sung Hwang,; Ichou, Raphaelle; Ilkaev, Radiy; Ilkiv, Iryna; Inaba, Motoi; Incani, Elisa; Pier Giorgio Innocenti,; Innocenti, GIAN MICHELE; Ippolitov, Mikhail; Irfan, Muhammad; Cristian George Ivan,; Ivanov, Marian; Ivanov, Vladimir; Ivanov, Andrey; Ivanytskyi, Oleksii; Adam Wlodzimierz Jacholkowski,; Jacobs, Peter; Jancurova, Lucia; Haeng Jin Jang,; Swensy Gwladys Jangal,; Janik, Rudolf; Malgorzata Anna Janik,; Jayarathna, Sandun; Jena, Satyajit; Raul Tonatiuh Jimenez Bustamante,; Jirden, Lennart; Peter Graham Jones,; Won Woong Jung,; Hyung Taik Jung,; Jusko, Anton; Kaidalov, Alexei; Kakoyan, Vanik; Kalcher, Sebastian; Kalinak, Peter; Kalisky, Matus; Tuomo Esa Aukusti Kalliokoski,; Alexander Philipp Kalweit,; Kanaki, Kalliopi; Ju Hwan Kang,; Kaplin, Vladimir; Ayben Karasu Uysal,; Karavichev, Oleg; Karavicheva, Tatiana; Karpechev, Evgeny; Kazantsev, Andrey; Udo Wolfgang Kebschull,; Keidel, Ralf; Khan, Palash; Mohisin Mohammed Khan,; Shuaib Ahmad Khan,; Khanzadeev, Alexei; Kharlov, Yury; Kileng, Bjarte; Kim, Jonghyun; Dong Jo Kim,; Do Won Kim,; Jin Sook Kim,; Kim, Minwoo; Seon Hee Kim,; Se Yong Kim,; Kim, Beomkyu; Kim, Taesoo; Kirsch, Stefan; Kisel, Ivan; Kiselev, Sergey; Adam Ryszard Kisiel,; Jennifer Lynn Klay,; Klein, Jochen; Christian Klein Bosing,; Kliemant, Michael; Kluge, Alexander; Michael Linus Knichel,; Koch, Kathrin; Kohler, Markus; Kolojvari, Anatoly; Kondratiev, Valery; Kondratyeva, Natalia; Konevskih, Artem; Korneev, Andrey; Chamath Kottachchi Kankanamge Don,; Kour, Ravjeet; Kowalski, Marek; Kox, Serge; Greeshma Koyithatta Meethaleveedu,; Kral, Jiri; Kralik, Ivan; Kramer, Frederick; Ingrid Christine Kraus,; Krawutschke, Tobias; Kretz, Matthias; Krivda, Marian; Krizek, Filip; Krus, Miroslav; Kryshen, Evgeny; Krzewicki, Mikolaj; Kucheriaev, Yury; Christian Claude Kuhn,; Kuijer, Paul; Kurashvili, Podist; Kurepin, A. 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Aditya Nath Mishra,; Miskowiec, Dariusz; Ciprian Mihai Mitu,; Mlynarz, Jocelyn; Ajit Kumar Mohanty,; Mohanty, Bedangadas; Molnar, Levente; Luis Manuel Montano Zetina,; Monteno, Marco; Montes, Esther; Moon, Taebong; Morando, Maurizio; Denise Aparecida Moreira Godoy,; Moretto, Sandra; Morsch, Andreas; Muccifora, Valeria; Mudnic, Eugen; Muhuri, Sanjib; Muller, Hans; Munhoz, Marcelo; Musa, Luciano; Musso, Alfredo; Basanta Kumar Nandi,; Nania, Rosario; Nappi, Eugenio; Nattrass, Christine; Naumov, Nikolay; Navin, Sparsh; Tapan Kumar Nayak,; Nazarenko, Sergey; Nazarov, Gleb; Nedosekin, Alexander; Nicassio, Maria; Borge Svane Nielsen,; Niida, Takafumi; Nikolaev, Sergey; Nikolic, Vedran; Nikulin, Vladimir; Nikulin, Sergey; Bjorn Steven Nilsen,; Mads Stormo Nilsson,; Noferini, Francesco; Nomokonov, Petr; Nooren, Gerardus; Novitzky, Norbert; Nyanin, Alexandre; Nyatha, Anitha; Nygaard, Casper; Joakim Ingemar Nystrand,; Obayashi, Hideyuki; Ochirov, Alexander; Helmut Oskar Oeschler,; Sun Kun Oh,; Saehanseul, Oh; 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Schuchmann, Simone; Schukraft, Jurgen; Yves Roland Schutz,; Kilian Eberhard Schwarz,; Kai Oliver Schweda,; Scioli, Gilda; Scomparin, Enrico; Scott, Rebecca; Patrick Aaron Scott,; Segato, Gianfranco; Selioujenkov, Ilya; Senyukov, Serhiy; Seo, Jeewon; Serci, Sergio; Serradilla, Eulogio; Sevcenco, Adrian; Sgura, Irene; Shabetai, Alexandre; Shabratova, Galina; Shahoyan, Ruben; Sharma, Natasha; Sharma, Satish; Shigaki, Kenta; Shimomura, Maya; Shtejer, Katherin; Sibiriak, Yury; Siciliano, Melinda; Sicking, Eva; Siddhanta, Sabyasachi; Siemiarczuk, Teodor; David Olle Rickard Silvermyr,; Simonetti, Giuseppe; Rama Narayana Singaraju,; Singh, Ranbir; Singha, Subhash; Sinha, Bikash; Sinha, Tinku; Sitar, Branislav; Sitta, Mario; Skaali, Bernhard; Skjerdal, Kyrre; Smakal, Radek; Smirnov, Nikolai; Snellings, Raimond; Sogaard, Carsten; Ron Ariel Soltz,; Son, Hyungsuk; Song, Jihye; Song, Myunggeun; Soos, Csaba; Soramel, Francesca; Sputowska, Iwona; Martha Spyropoulou Stassinaki,; Brijesh Kumar Srivastava,; 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doi:10.1007/JHEP07(2012)116

We present measurements of Underlying Event observables in pp collisions at root(s) = 0.9 and 7 TeV. The analysis is performed as a function of the highest charged-particle transverse momentum pT,LT in 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 pT thresholds: 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 pT threshold considered. Data are compared to Pythia 6.4, Pythia 8.1 and Phojet. On average, all models considered underestimate the multiplicity and summed pT in the Transverse region by about 10–30%.