@article{3166296,
    title = "Centrality dependence of particle production in p-Pb collisions at root
s(NN)=5.02 TeV",
    author = "Adam, J. and Adamova, D. and Aggarwal, M. M. and Rinella, G. Aglieri and and Agnello, M. and Agostinelli, A. and Agrawal, N. and Ahammed, Z. and and Ahmed, I. and Ahn, S. U. and Aimo, I. and Aiola, S. and Ajaz, M. and and Akindinov, A. and Alam, S. N. and Aleksandrov, D. and Alessandro, B. and and Alexandre, D. and Alfaro Molina, R. and Alici, A. and Alkin, A. and and Alme, J. and Alt, T. and Altinpinar, S. and Altsybeev, I. and Garcia and Prado, C. Alves and Andrei, C. and Andronic, A. and Anguelov, V. and and Anielski, J. and Anticic, T. and Antinori, F. and Antonioli, P. and and Aphecetche, L. and Appelshaeuser, H. and Arcelli, S. and Armesto, N. and and Arnaldi, R. and Aronsson, T. and Arsene, I. C. and Arslandok, M. and and Augustinus, A. and Averbeck, R. and Azmi, M. D. and Bach, M. and Badala, and A. and Baek, Y. W. and Bagnasco, S. and Bailhache, R. and Bala, R. and and Baldisseri, A. and Ball, M. and Pedrosa, F. Baltasar Dos Santos and and Baral, R. 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K. and and Bhattacharjee, B. and Bhom, J. and Bianchi, L. and Bianchi, N. and and Bianchin, C. and Bielcik, J. and Bielcikova, J. and Bilandzic, A. and and Biswas, S. and Bjelogrlic, S. and Blanco, F. and Blau, D. and Blume, C. and and Bock, F. and Bogdanov, A. and Boggild, H. and Boldizsar, L. and and Bombara, M. and Book, J. and Borel, H. and Borissov, A. and Borri, M. and and Bossu, F. and Botje, M. and Botta, E. and Boettger, S. and and Braun-Munzinger, P. and Bregant, M. and Breitner, T. and Broker, T. A. and and Browning, T. A. and Broz, M. and Bruna, E. and Bruno, G. E. and and Budnikov, D. and Buesching, H. and Bufalino, S. and Buncic, P. and and Busch, O. and Buthelezi, Z. and Buxton, J. T. and Caffarri, D. and Cai, and X. and Caines, H. and Diaz, L. Calero and Caliva, A. and Calvo Villar, and E. and Camerini, P. and Carena, F. and Carena, W. and Castellanos, J. and Castillo and Castro, A. J. and Casula, E. A. 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S. and Zhalov, M. and Zhang, H. and and Zhang, X. and Zhang, Y. and Zhao, C. and Zhigareva, N. and Zhou, D. and and Zhou, Y. and Zhou, Z. and Zhu, H. and Zhu, J. and Zhu, X. and Zichichi, and A. and Zimmermann, A. and Zimmermann, M. B. and Zinovjev, G. and Zyzak, and M. and ALICE Collaboration",
    journal = "Physical Review C",
    year = "2015",
    volume = "91",
    number = "6",
    publisher = "AMER PHYSICAL SOC",
    issn = "2469-9985, 2469-9993",
    doi = "10.1103/PhysRevC.91.064905",
    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."
}