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Centrality dependence of particle production in p-Pb collisions at root s(NN)=5.02 TeV

Adam, J.; Adamova, D.; Aggarwal, M. M.; Rinella, G. Aglieri; Agnello, M.; Agostinelli, A.; Agrawal, N.; Ahammed, Z.; Ahmed, I. and Ahn, S. U., et al. (2015) In Physical Review C (Nuclear Physics) 91(6).
Abstract
We report measurements of the primary charged-particle pseudorapidity density and transverse momentum distributions in p-Pb collisions at root s(NN) = 5.02 TeV and investigate their correlation with experimental observables sensitive to the centrality of the collision. Centrality classes are defined by using different event-activity estimators, i.e., charged-particle multiplicities measured in three different pseudorapidity regions as well as the energy measured at beam rapidity (zero degree). The procedures to determine the centrality, quantified by the number of participants (N-part) or the number of nucleon-nucleon binary collisions (N-coll) are described. We show that, in contrast to Pb-Pb collisions, in p-Pb collisions large... (More)
We report measurements of the primary charged-particle pseudorapidity density and transverse momentum distributions in p-Pb collisions at root s(NN) = 5.02 TeV and investigate their correlation with experimental observables sensitive to the centrality of the collision. Centrality classes are defined by using different event-activity estimators, i.e., charged-particle multiplicities measured in three different pseudorapidity regions as well as the energy measured at beam rapidity (zero degree). The procedures to determine the centrality, quantified by the number of participants (N-part) or the number of nucleon-nucleon binary collisions (N-coll) are described. We show that, in contrast to Pb-Pb collisions, in p-Pb collisions large multiplicity fluctuations together with the small range of participants available generate a dynamical bias in centrality classes based on particle multiplicity. We propose to use the zero-degree energy, which we expect not to introduce a dynamical bias, as an alternative event-centrality estimator. Based on zero-degree energy-centrality classes, the N-part dependence of particle production is studied. Under the assumption that the multiplicity measured in the Pb-going rapidity region scales with the number of Pb participants, an approximate independence of the multiplicity per participating nucleon measured at mid-rapidity of the number of participating nucleons is observed. Furthermore, at high-pT the p-Pb spectra are found to be consistent with the pp spectra scaled by N-coll for all centrality classes. Our results represent valuable input for the study of the event-activity dependence of hard probes in p-Pb collisions and, hence, help to establish baselines for the interpretation of the Pb-Pb data. (Less)
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Physical Review C (Nuclear Physics)
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91
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6
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American Physical Society
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  • scopus:84935844751
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0556-2813
DOI
10.1103/PhysRevC.91.064905
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English
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2015-07-24 09:32:50
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@article{fbc0c7c8-5e04-4e1d-9a46-0135ed446db6,
  abstract     = {We report measurements of the primary charged-particle pseudorapidity density and transverse momentum distributions in p-Pb collisions at root s(NN) = 5.02 TeV and investigate their correlation with experimental observables sensitive to the centrality of the collision. Centrality classes are defined by using different event-activity estimators, i.e., charged-particle multiplicities measured in three different pseudorapidity regions as well as the energy measured at beam rapidity (zero degree). The procedures to determine the centrality, quantified by the number of participants (N-part) or the number of nucleon-nucleon binary collisions (N-coll) are described. We show that, in contrast to Pb-Pb collisions, in p-Pb collisions large multiplicity fluctuations together with the small range of participants available generate a dynamical bias in centrality classes based on particle multiplicity. We propose to use the zero-degree energy, which we expect not to introduce a dynamical bias, as an alternative event-centrality estimator. Based on zero-degree energy-centrality classes, the N-part dependence of particle production is studied. Under the assumption that the multiplicity measured in the Pb-going rapidity region scales with the number of Pb participants, an approximate independence of the multiplicity per participating nucleon measured at mid-rapidity of the number of participating nucleons is observed. Furthermore, at high-pT the p-Pb spectra are found to be consistent with the pp spectra scaled by N-coll for all centrality classes. Our results represent valuable input for the study of the event-activity dependence of hard probes in p-Pb collisions and, hence, help to establish baselines for the interpretation of the Pb-Pb data.},
  articleno    = {064905},
  author       = {Adam, J. and Adamova, D. and Aggarwal, M. M. and Rinella, G. Aglieri and Agnello, M. and Agostinelli, A. and Agrawal, N. and Ahammed, Z. and Ahmed, I. and Ahn, S. U. and Aimo, I. and Aiola, S. and Ajaz, M. and Akindinov, A. and Alam, S. N. and Aleksandrov, D. and Alessandro, B. and Alexandre, D. and Alfaro Molina, R. and Alici, A. and Alkin, A. and Alme, J. and Alt, T. and Altinpinar, S. and Altsybeev, I. and Garcia Prado, C. Alves and Andrei, C. and Andronic, A. and Anguelov, V. and Anielski, J. and Anticic, T. and Antinori, F. and Antonioli, P. and Aphecetche, L. and Appelshaeuser, H. and Arcelli, S. and Armesto, N. and Arnaldi, R. and Aronsson, T. and Arsene, I. C. and Arslandok, M. and Augustinus, A. and Averbeck, R. and Azmi, M. D. and Bach, M. and Badala, A. and Baek, Y. W. and Bagnasco, S. and Bailhache, R. and Bala, R. and Baldisseri, A. and Ball, M. and Pedrosa, F. Baltasar Dos Santos and Baral, R. C. and Barbano, A. M. and Barbera, R. and Barile, F. and Barnafoeldi, G. G. and Barnby, L. S. and Barret, V. and Bartalini, P. and Bartke, J. and Bartsch, E. and Basile, M. and Bastid, N. and Basu, S. and Bathen, B. and Batigne, G. and Batista Camejo, A. and Batyunya, B. and Batzing, P. C. and Bearden, I. G. and Beck, H. and Bedda, C. and Behera, N. K. and Belikov, I. and Bellini, F. and Bello Martinez, H. and Bellwied, R. and Belmont, R. and Belmont-Moreno, E. and Belyaev, V. and Bencedi, G. and Beole, S. and Berceanu, I. and Bercuci, A. and Berdnikov, Y. and Berenyi, D. and Bertens, R. A. and Berzano, D. and Betev, L. and Bhasin, A. and Bhat, I. R. and Bhati, A. K. and Bhattacharjee, B. and Bhom, J. and Bianchi, L. and Bianchi, N. and Bianchin, C. and Bielcik, J. and Bielcikova, J. and Bilandzic, A. and Biswas, S. and Bjelogrlic, S. and Blanco, F. and Blau, D. and Blume, C. and Bock, F. and Bogdanov, A. and Boggild, H. and Boldizsar, L. and Bombara, M. and Book, J. and Borel, H. and Borissov, A. and Borri, M. and Bossu, F. and Botje, M. and Botta, E. and Boettger, S. and Braun-Munzinger, P. and Bregant, M. and Breitner, T. and Broker, T. A. and Browning, T. A. and Broz, M. and Bruna, E. and Bruno, G. E. and Budnikov, D. and Buesching, H. and Bufalino, S. and Buncic, P. and Busch, O. and Buthelezi, Z. and Buxton, J. T. and Caffarri, D. and Cai, X. and Caines, H. and Diaz, L. Calero and Caliva, A. and Calvo Villar, E. and Camerini, P. and Carena, F. and Carena, W. and Castellanos, J. Castillo and Castro, A. J. and Casula, E. A. R. and Catanescu, V. and Cavicchioli, C. and Ceballos Sanchez, C. and Cepila, J. and Cerello, P. and Chang, B. and Chapeland, S. and Chartier, M. and Charvet, J. L. and Chattopadhyay, S. and Chattopadhyay, S. and Chelnokov, V. and Cherney, M. and Cheshkov, C. and Cheynis, B. and Barroso, V. Chibante and Chinellato, D. D. and Chochula, P. and Choi, K. and Chojnacki, M. and Choudhury, S. and Christakoglou, P. and Christensen, C. H. and Christiansen, Peter and Chujo, T. and Chung, S. U. and Cicalo, C. and Cifarelli, L. and Cindolo, F. and Cleymans, J. and Colamaria, F. and Colella, D. and Collu, A. and Colocci, M. and Balbastre, G. Conesa and del Valle, Z. Conesa and Connors, M. E. and Contreras, J. G. and Cormier, T. M. and Morales, Y. Corrales and Maldonado, I. Cortes and Cortese, P. and Cosentino, M. R. and Costa, F. and Crochet, P. and Albino, R. Cruz and Cuautle, E. and Cunqueiro, L. and Dahms, T. and Dainese, A. and Danu, A. and Das, D. and Das, I. and Das, S. and Dash, A. and Dash, S. and De, S. and De Caro, A. and de Cataldo, G. and de Cuveland, J. and De Falco, A. and De Gruttola, D. and De Marco, N. and De Pasquale, S. and Deloff, A. and Denes, E. and D'Erasmo, G. and Di Bari, D. and Di Mauro, A. and Di Nezza, P. and Diaz Corchero, M. A. and Dietel, T. and Dillenseger, P. and Divia, R. and Djuvsland, O. and Dobrin, A. and Dobrowolski, T. and Gimenez, D. Domenicis and Onigus, B. D. and Dordic, O. and Dubey, A. K. and Dubla, A. and Ducroux, L. and Dupieux, P. and Dutta Majumdar, A. K. and Ehlers, R. J. and Elia, D. and Engel, H. and Erazmus, B. and Erdal, H. A. and Eschweiler, D. and Espagnon, B. and Esposito, M. and Estienne, M. and Esumi, S. and Evans, D. and Evdokimov, S. and Eyyubova, G. and Fabbietti, L. and Fabris, D. and Faivre, J. and Fantoni, A. and Fasel, M. and Feldkamp, L. and Felea, D. and Feliciello, A. and Feofilov, G. and Ferencei, J. and Fernandez Tellez, A. and Ferreiro, E. G. and Ferretti, A. and Festanti, A. and Figiel, J. and Figueredo, M. A. S. and Filchagin, S. and Finogeev, D. and Fionda, F. M. and Fiore, E. M. and Floris, M. and Foertsch, S. and Foka, P. and Fokin, S. and Fragiacomo, E. and Francescon, A. and Frankenfeld, U. and Fuchs, U. and Furget, C. and Furs, A. and Girard, M. Fusco and Gaardhoje, J. J. and Gagliardi, M. and Gago, A. M. and Gallio, M. and Gangadharan, D. R. and Ganoti, P. and Gao, C. and Garabatos, C. and Garcia-Solis, E. and Gargiulo, C. and Gasik, P. and Germain, M. and Gheata, A. and Gheata, M. and Ghidini, B. and Ghosh, P. and Ghosh, S. K. and Gianotti, P. and Giubellino, P. and Giubilato, P. and Gladysz-Dziadus, E. and Glaessel, P. and Ramirez, A. Gomez and Gonzalez-Zamora, P. and Gorbunov, S. and Goerlich, L. and Gotovac, S. and Grabski, V. and Graczykowski, L. K. and Grelli, A. and Grigoras, A. and Grigoras, C. and Grigoriev, V. and Grigoryan, A. and Grigoryan, S. and Grinyov, B. and Grion, N. and Gronefeld, J. and Grosse-Oetringhaus, J. F. and Grosso, R. and Grossiord, J. -Y. and Guber, F. and Guernane, R. and Guerzoni, B. and Gulbrandsen, K. and Gulkanyan, H. and Gunji, T. and Gupta, A. and Gupta, R. and Haake, R. and Haaland, O. and Hadjidakis, C. and Haiduc, M. and Hamagaki, H. and Hamar, G. and Hanratty, L. D. and Hansen, A. and Harris, J. W. and Hartmann, H. and Harton, A. and Hatzifotiadou, D. and Hayashi, S. and Heckel, S. T. and Heide, M. and Helstrup, H. and Herghelegiu, A. and Corral, G. Herrera and Hess, B. A. and Hetland, K. F. and Hilden, T. E. and Hillemanns, H. and Hippolyte, B. and Hristov, P. and Huang, M. and Humanic, T. J. and Hussain, N. and Hussain, T. and Hutter, D. and Hwang, D. S. and Ilkaev, R. and Ilkiv, I. and Inaba, M. and Innocenti, G. M. and Ionita, C. and Ippolitov, M. and Irfan, M. and Ivanov, M. and Ivanov, V. and Jacholkowski, A. and Jacobs, P. M. and Jahnke, C. and Jang, H. J. and Janik, M. A. and Jayarathna, P. H. S. Y. and Jena, C. and Jena, S. and Bustamante, R. T. Jimenez and Jones, P. G. and Jung, H. and Jusko, A. and Kadyshevskiy, V. and Kalinak, P. and Kalweit, A. and Kamin, J. and Kang, J. H. and Kaplin, V. and Kar, S. and Uysal, A. Karasu and Karavichev, O. and Karavicheva, T. and Karpechev, E. and Kebschull, U. and Keidel, R. and Keijdener, D. L. D. and Keil, M. and Ketzer, B. and Khan, K. H. and Khan, M. M. and Khan, P. and Khan, S. A. and Khanzadeev, A. and Kharlov, Y. and Kileng, B. and Kim, B. and Kim, D. W. and Kim, D. J. and Kim, H. and Kim, J. S. and Kim, M. and Kim, M. and Kim, S. and Kim, T. and Kirsch, S. and Kisel, I. and Kiselev, S. and Kisiel, A. and Kiss, G. and Klay, J. L. and Klein, C. and Klein, J. and Klein-Boesing, C. and Kluge, A. and Knichel, M. L. and Knospe, A. G. and Kobayashi, T. and Kobdaj, C. and Kofarago, M. and Koehler, M. K. and Kollegger, T. and Kolojvari, A. and Kondratiev, V. and Kondratyeva, N. and Kondratyuk, E. and Konevskikh, A. and Kovalenko, V. and Kowalski, M. and Kox, S. and Meethaleveedu, G. Koyithatta and Kral, J. and Kralik, I. and Kravcakova, A. and Krelina, M. and Kretz, M. and Krivda, M. and Krizek, F. and Kryshen, E. and Krzewicki, M. and Kubera, A. M. and Kucera, V. and Kucheriaev, Y. and Kugathasan, T. and Kuhn, C. and Kuijer, P. G. and Kulakov, I. and Kumar, J. and Kurashvili, P. and Kurepin, A. and Kurepin, A. B. and Kuryakin, A. and Kushpil, S. and Kweon, M. J. and Kwon, Y. and La Pointe, S. L. and La Rocca, P. and Fernandes, C. 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V. and Margotti, A. and Margutti, J. and Marin, A. and Markert, C. and Marquard, M. and Martashvili, I. and Martin, N. A. and Blanco, J. Martin and Martinengo, P. and Martinez, M. I. and Martinez Garcia, G. and Martynov, Y. and Mas, A. and Masciocchi, S. and Masera, M. and Masoni, A. and Massacrier, L. and Mastroserio, A. and Matyja, A. and Mayer, C. and Mazer, J. and Mazzoni, M. A. and Mcdonald, D. and Meddi, F. and Menchaca-Rocha, A. and Meninno, E. and Perez, J. Mercado and Meres, M. and Miake, Y. and Mieskolainen, M. M. and Mikhaylov, K. and Milano, L. and Milosevic, J. and Minervini, L. M. and Mischke, A. and Mishra, A. N. and Miskowiec, D. and Mitra, J. and Mitu, C. M. and Mlynarz, J. and Mohammadi, N. and Mohanty, B. and Molnar, L. and Zetina, L. Montano and Montes, E. and Morando, M. and De Godoy, D. A. Moreira and Moretto, S. and Morreale, A. and Morsch, A. and Muccifora, V. and Mudnic, E. and Muehlheim, D. and Muhuri, S. and Mukherjee, M. and Mueller, H. and Munhoz, M. 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  issn         = {0556-2813},
  language     = {eng},
  number       = {6},
  publisher    = {American Physical Society},
  series       = {Physical Review C (Nuclear Physics)},
  title        = {Centrality dependence of particle production in p-Pb collisions at root s(NN)=5.02 TeV},
  url          = {http://dx.doi.org/10.1103/PhysRevC.91.064905},
  volume       = {91},
  year         = {2015},
}