1. Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV
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Abbas, Ehab, Abelev, Betty, Adam, Jaroslav, Adamova, Dagmar, Adare, Andrew Marshall, Aggarwal, Madan, Aglieri Rinella, Gianluca, Agnello, Michelangelo, Agocs, Andras Gabor, Agostinelli, Andrea, Ahammed, Zubayer, Ahmad, Arshad, Ahmad, Nazeer, Ahn, Sang Un, Ahn, Sul-Ah, Aimo, Ilaria, Ajaz, Muhammad, Akindinov, Alexander, Aleksandrov, Dmitry, Alessandro, Bruno, Alici, Andrea, Alkin, Anton, Almaraz Avina, Erick Jonathan, Alme, Johan, Alt, Torsten, Altini, Valerio, Altinpinar, Sedat, Altsybeev, Igor, Andrei, Cristian, Andronic, Anton, Anguelov, Venelin, Anielski, Jonas, Anson, Christopher Daniel, Anticic, Tome, Antinori, Federico, Antonioli, Pietro, Aphecetche, Laurent Bernard, Appelshauser, Harald, Arbor, Nicolas, Arcelli, Silvia, Arend, Andreas, Armesto, Nestor, Arnaldi, Roberta, Aronsson, Tomas Robert, Arsene, Ionut Cristian, Arslandok, Mesut, Asryan, Andzhey, Augustinus, Andre, Averbeck, Ralf Peter, Awes, Terry, Aysto, Juha Heikki, Azmi, Mohd Danish, Bach, Matthias Jakob, Badala, 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Kushal, Das, Indranil, Das, Supriya, Das, Debasish, Dash, Ajay Kumar, Dash, Sadhana, De, Sudipan, de Barros, Gabriel, De Caro, Annalisa, de Cataldo, Giacinto, de Cuveland, Jan, De Falco, Alessandro, De Gruttola, Daniele, Delagrange, Hugues, Deloff, Andrzej, De Marco, Nora, Denes, Ervin, De Pasquale, Salvatore, Deppman, Airton, D'Erasmo, Ginevra, de Rooij, Raoul Stefan, Diaz Corchero, Miguel Angel, Di Bari, Domenico, Dietel, Thomas, Di Giglio, Carmelo, Di Liberto, Sergio, Di Mauro, Antonio, Di Nezza, Pasquale, Divia, Roberto, Djuvsland, Oeystein, Dobrin, Alexandru Florin, Dobrowolski, Tadeusz Antoni, Donigus, Benjamin, Dordic, Olja, Driga, Olga, Dubey, Anand Kumar, Dubla, Andrea, Ducroux, Laurent, Dupieux, Pascal, Dutta Majumdar, AK, Elia, Domenico, Emschermann, David Philip, Engel, Heiko, Erazmus, Barbara, Erdal, Hege Austrheim, Eschweiler, Dominic, Espagnon, Bruno, Estienne, Magali Danielle, Esumi, Shinichi, Evans, David, Evdokimov, Sergey, Eyyubova, Gyulnara, Fabris, Daniela, Faivre, 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Herrera Corral, Gerardo Antonio, Herrmann, Norbert, Hess, Benjamin Andreas, Hetland, Kristin Fanebust, Hicks, Bernard, Hippolyte, Boris, Hori, Yasuto, Hristov, Peter Zahariev, Hrivnacova, Ivana, Huang, Meidana, Humanic, Thomas, Hwang, Dae Sung, Ichou, Raphaelle, Ilkaev, Radiy, Ilkiv, Iryna, Inaba, Motoi, Incani, Elisa, Innocenti, Pier Giorgio, Innocenti, Gian Michele, Ippolitov, Mikhail, Irfan, Muhammad, Ivan, Cristian George, Ivanov, Vladimir, Ivanov, Andrey, Ivanov, Marian, Ivanytskyi, Oleksii, Jacholkowski, Adam Wlodzimierz, Jacobs, Peter, Jahnke, Cristiane, Jang, Haeng Jin, Janik, Malgorzata Anna, Jayarathna, Sandun, Jena, Satyajit, Jha, Deeptanshu Manu, Jimenez Bustamante, Raul Tonatiuh, Jones, Peter Graham, Jung, Hyung Taik, Jusko, Anton, Kaidalov, Alexei, Kalcher, Sebastian, Kalinak, Peter, Kalliokoski, Tuomo Esa Aukusti, Kalweit, Alexander Philipp, Kang, Ju Hwan, Kaplin, Vladimir, Kar, Somnath, Karasu Uysal, Ayben, Karavichev, Oleg, Karavicheva, Tatiana, Karpechev, Evgeny, 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UNIVERSIDADE DE ESTADUAL DE CAMPINAS, Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Département Recherches Subatomiques (DRS-IPHC), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Calcul de l'IN2P3 (CC-IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), ALICE, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
- Subjects
Heavy-ion collisions ,Kjerne- og elementærpartikkelfysikk: 431 [VDP] ,Matematikk og naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431 [VDP] ,FOS: Physical sciences ,Charged-particle density ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Mathematics and natural scienses: 400::Physics: 430::Nuclear and elementary particle physics: 431 [VDP] ,High Energy Physics - Experiment ,High Energy Physics - Experiment (hep-ex) ,Nuclear and elementary particle physics: 431 [VDP] ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,Wide rapidity coverage ,Nuclear Physics - Experiment ,LHC ,Nuclear Experiment (nucl-ex) ,Nuclear Experiment ,Heavy ions collisions ,charged-particle density ,Particle Physics - Experiment - Abstract
We present the first wide-range measurement of the charged-particle pseudorapidity density distribution, for different centralities (the 0-5%, 5-10%, 10-20%, and 20-30% most central events) in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV at the LHC. The measurement is performed using the full coverage of the ALICE detectors, $-5.0 < ��< 5.5$, and employing a special analysis technique based on collisions arising from LHC "satellite" bunches. We present the pseudorapidity density as a function of the number of participating nucleons as well as an extrapolation to the total number of produced charged particles ($N_{\rm ch} = 17165 \pm 772$ for the 0-5% most central collisions). From the measured ${\rm d}N_{\rm ch}/{\rm d}��$ distribution we derive the rapidity density distribution, ${\rm d}N_{\rm ch}/{\rm d}y$, under simple assumptions. The rapidity density distribution is found to be significantly wider than the predictions of the Landau model. We assess the validity of longitudinal scaling by comparing to lower energy results from RHIC. Finally the mechanisms of the underlying particle production are discussed based on a comparison with various theoretical models., 21 pages, 9 captioned figures, 2 tables, authors from page 16, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/592
- Published
- 2016
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