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Suppression of charged particle production at large transverse momentum in central Pb-Pb collisions at sNN=2.76 TeV
Authors
K. Aamodt Abrahantes Quintana, A. Adamová, D. Adare, A.M. Aggarwal, M.M. Aglieri Rinella, G. Agocs, A.G. Aguilar Salazar, S. Ahammed, Z. Ahmad, N. Ahmad Masoodi, A. Ahn, S.U. Akindinov, A. Aleksandrov, D. Alessandro, B. Alfaro Molina, R. Alici, A. Alkin, A. Almaráz Aviña, E. Alt, T. Altini, V. Altinpinar, S. Altsybeev, I. Andrei, C. Andronic, A. Anguelov, V. Anson, C. Antičić, T. Antinori, F. Antonioli, P. Aphecetche, L. Appelshäuser, H. Arbor, N. Arcelli, S. Arend, A. Armesto, N. Arnaldi, R. Aronsson, T. Arsene, I.C. Asryan, A. Augustinus, A. Averbeck, R. Awes, T.C. Aystö, J. Azmi, M.D. Bach, M. Badalà, A. Baek, Y.W. Bagnasco, S. Bailhache, R. Bala, R. Baldini Ferroli, R. Baldisseri, A. Baldit, A. Bán, J. Barbera, R. Barile, F. Barnaföldi, G.G. Barnby, L.S. Barret, V. Bartke, J. Basile, M. Bastid, N. Bathen, B. Batigne, G. Batyunya, B. Baumann, C. Bearden, I.G. Beck, H. Belikov, I. Bellini, F. Bellwied, R. Belmont-Moreno, E. Beole, S. Berceanu, I. Bercuci, A. Berdermann, E. Berdnikov, Y. Betev, L. Bhasin, A. Bhati, A.K. Bianchi, L. Bianchi, N. Bianchin, C. Bielčík, J. Bielčíková, J. Bilandzic, A. Biolcati, E. Blanc, A. Blanco, F. Blanco, F. Blau, D. Blume, C. Boccioli, M. Bock, N. Bogdanov, A. Bøggild, H. Bogolyubsky, M. Boldizsár, L. Bombara, M. Bombonati, C. Book, J. Borel, H. Bortolin, C. Bose, S. Bossú, F. Botje, M. Böttger, S. Boyer, B. Braun-Munzinger, P. Bravina, L. Bregant, M. Breitner, T. Broz, M. Brun, R. Bruna, E. Bruno, G.E. Budnikov, D. Buesching, H. Busch, O. Buthelezi, Z. Caffarri, D. Cai, X. Caines, H. Calvo Villar, E. Camerini, P. Canoa Roman, V. Cara Romeo, G. Carena, F. Carena, W. Carminati, F. Casanova Díaz, A. Caselle, M. Castillo Castellanos, J. Catanescu, V. Cavicchioli, C. Cerello, P. Chang, B. Chapeland, S. Charvet, J.L. Chattopadhyay, S. Chattopadhyay, S. Cherney, M. Cheshkov, C. Cheynis, B. Chiavassa, E. Chibante Barroso, V. Chinellato, D.D. Chochula, P. Chojnacki, M. Christakoglou, P. Christensen, C.H. Christiansen, P. Chujo, T. Cicalo, C. Cifarelli, L. Cindolo, F. Cleymans, J. Coccetti, F. Coffin, J.-P. Coli, S. Conesa Balbastre, G. Conesa del Valle, Z. Constantin, P. Contin, G. Contreras, J.G. Cormier, T.M. Corrales Morales, Y. Cortés Maldonado, I. Cortese, P. Cosentino, M.R. Costa, F. Cotallo, M.E. Crescio, E. Crochet, P. Cuautle, E. Cunqueiro, L. Erasmo, G.D. Dainese, A. Dalsgaard, H.H. Danu, A. Das, D. Das, I. Dash, A. Dash, S. De, S. De Azevedo Moregula, A. de Barros, G.O.V. De Caro, A. de Cataldo, G. de Cuveland, J. De Falco, A. De Gruttola, D. De Marco, N. De Pasquale, S. De Remigis, R. de Rooij, R. Delagrange, H. Delgado Mercado, Y. Dellacasa, G. Deloff, A. Demanov, V. Dénes, E. Deppman, A. Di Bari, D. Di Giglio, C. Di Liberto, S. Di Mauro, A. Di Nezza, P. Dietel, T. Divià, R. Djuvsland, Ø. Dobrin, A. Dobrowolski, T. Domínguez, I. Dönigus, B. Dordic, O. Driga, O. Dubey, A.K. Dubuisson, J. Ducroux, L. Dupieux, P. Dutta Majumdar, A.K. Dutta Majumdar, M.R. Elia, D. Emschermann, D. Engel, H. Erdal, H.A. Espagnon, B. Estienne, M. Esumi, S. Evans, D. Evrard, S. Eyyubova, G. Fabjan, C.W. Fabris, D. Faivre, J. Falchieri, D. Fantoni, A. Fasel, M. Fearick, R. Fedunov, A. Fehlker, D. Fekete, V. Felea, D. Feofilov, G. Fernández Téllez, A. Ferretti, A. Ferretti, R. Figueredo, M.A.S. Filchagin, S. Fini, R. Finogeev, D. Fionda, F.M. Fiore, E.M. Floris, M. Foertsch, S. Foka, P. Fokin, S. Fragiacomo, E. Fragkiadakis, M. Frankenfeld, U. Fuchs, U. Furano, F. Furget, C. Fusco Girard, M. Gaardhøje, J.J. Gadrat, S. Gagliardi, M. Gago, A. Gallio, M. Ganoti, P. Garabatos, C. Gemme, R. Gerhard, J. Germain, M. Geuna, C. Gheata, A. Gheata, M. Ghidini, B. Ghosh, P. Girard, M.R. Giraudo, G. Giubellino, P. Gladysz-Dziadus, E. Glässel, P. Gomez, R. González-Trueba, L.H. González-Zamora, P. González Santos, H. Gorbunov, S. Gotovac, S. Grabski, V. Grajcarek, R. Grelli, A. Grigoras, A. Grigoras, C. Grigoriev, V. Grigoryan, A. Grigoryan, S. Grinyov, B. Grion, N. Gros, P. Grosse-Oetringhaus, J.F. Grossiord, J.-Y. Grosso, R. Guber, F. Guernane, R. Guerra Gutierrez, C. Guerzoni, B. Gulbrandsen, K. Gunji, T. Gupta, A. Gupta, R. Gutbrod, H. Haaland, Ø. Hadjidakis, C. Haiduc, M. Hamagaki, H. Hamar, G. Harris, J.W. Hartig, M. Hasch, D. Hasegan, D. Hatzifotiadou, D. Hayrapetyan, A. Heide, M. Heinz, M. Helstrup, H. Herghelegiu, A. Hernández, C. Herrera Corral, G. Herrmann, N. Hetland, K.F. Hicks, B. Hille, P.T. Hippolyte, B. Horaguchi, T. Hori, Y. Hristov, P. Hřivnáčová, I. Huang, M. Huber, S. Humanic, T.J. Hwang, D.S. Ichou, R. Ilkaev, R. Ilkiv, I. Inaba, M. Incani, E. Innocenti, G.M. Innocenti, P.G. Ippolitov, M. Irfan, M. Ivan, C. Ivanov, A. Ivanov, M. Ivanov, V. Jachołkowski, A. Jacobs, P.M. Jancurová, L. Jangal, S. Janik, R. Jayarathna, S.P. Jena, S. Jirden, L. Jones, G.T. Jones, P.G. Jovanović, P. Jung, H. Jung, W. Jusko, A. Kalcher, S. Kaliňák, P. Kalisky, M. Kalliokoski, T. Kalweit, A. Kamermans, R. Kanaki, K. Kang, E. Kang, J.H. Kaplin, V. Karavichev, O. Karavicheva, T. Karpechev, E. Kazantsev, A. Kebschull, U. Keidel, R. Khan, M.M. Khanzadeev, A. Kharlov, Y. Kileng, B. Kim, D.J. Kim, D.S. Kim, D.W. Kim, H.N. Kim, J.H. Kim, J.S. Kim, M. Kim, M. Kim, S. Kim, S.H. Kirsch, S. Kisel, I. Kiselev, S. Kisiel, A. Klay, J.L. Klein, J. Klein-Bösing, C. Kliemant, M. Klovning, A. Kluge, A. Knichel, M.L. Koch, K. Köhler, M.K. Kolevatov, R. Kolojvari, A. Kondratiev, V. Kondratyeva, N. Konevskih, A. Kornaś, E. Kottachchi Kankanamge Don, C. Kour, R. Kowalski, M. Kox, S. Kozlov, K. Kral, J. Králik, I. Kramer, F. Kraus, I. Krawutschke, T. Kretz, M. Krivda, M. Krumbhorn, D. Krus, M. Kryshen, E. Krzewicki, M. Kucheriaev, Y. Kuhn, C. Kuijer, P.G. Kurashvili, P. Kurepin, A. Kurepin, A.B. Kuryakin, A. Kushpil, S. Kushpil, V. Kweon, M.J. Kwon, Y. La Rocca, P. Ladrón de Guevara, P. Lafage, V. Lara, C. Larsen, D.T. Lazzeroni, C. Le Bornec, Y. Lea, R. Lee, K.S. Lee, S.C. Lefèvre, F. Lehnert, J. Leistam, L. Lenhardt, M. Lenti, V. León Monzón, I. León Vargas, H. Lévai, P. Li, X. Lietava, R. Lindal, S. Lindenstruth, V. Lippmann, C. Lisa, M.A. Liu, L. Loggins, V.R. Loginov, V. Lohn, S. Lohner, D. Loizides, C. Lopez, X. López Noriega, M. López Torres, E. Løvhøiden, G. Lu, X.-G. Luettig, P. Lunardon, M. Luparello, G. Luquin, L. Luzzi, C. Ma, K. Ma, R. Madagodahettige-Don, D.M. Maevskaya, A. Mager, M. Mahapatra, D.P. Maire, A. Malaev, M. Maldonado Cervantes, I. Mal&apos
Publication date
1 January 2011
Publisher
Abstract
Inclusive transverse momentum spectra of primary charged particles in Pb-Pb collisions at sNN=2.76 TeV have been measured by the ALICE Collaboration at the LHC. The data are presented for central and peripheral collisions, corresponding to 0-5% and 70-80% of the hadronic Pb-Pb cross section. The measured charged particle spectra in |n|<0.8 and 0.3<pT<20 GeV/c are compared to the expectation in pp collisions at the same sNN, scaled by the number of underlying nucleon-nucleon collisions. The comparison is expressed in terms of the nuclear modification factor RAA. The result indicates only weak medium effects (RAA≈0.7) in peripheral collisions. In central collisions, RAA reaches a minimum of about 0.14 at pT=6-7 GeV/c and increases significantly at larger pT. The measured suppression of high- pT particles is stronger than that observed at lower collision energies, indicating that a very dense medium is formed in central Pb-Pb collisions at the LHC. © 2010 CERN
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