Centrality dependence of particle production in p-Pb collisions at root s(NN)=5.02 TeV
(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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- author
- organization
- publishing date
- 2015
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review C (Nuclear Physics)
- volume
- 91
- issue
- 6
- article number
- 064905
- publisher
- American Physical Society
- external identifiers
-
- wos:000355721900004
- scopus:84935844751
- ISSN
- 0556-2813
- DOI
- 10.1103/PhysRevC.91.064905
- language
- English
- LU publication?
- yes
- id
- fbc0c7c8-5e04-4e1d-9a46-0135ed446db6 (old id 7608224)
- date added to LUP
- 2016-04-01 13:32:08
- date last changed
- 2023-03-10 20:03:31
@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.}}, 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. 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S. and Zhalov, M. and Zhang, H. and Zhang, X. and Zhang, Y. and Zhao, C. and Zhigareva, N. and Zhou, D. and Zhou, Y. and Zhou, Z. and Zhu, H. and Zhu, J. and Zhu, X. and Zichichi, A. and Zimmermann, A. and Zimmermann, M. B. and Zinovjev, G. and Zyzak, M.}}, 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}}, doi = {{10.1103/PhysRevC.91.064905}}, volume = {{91}}, year = {{2015}}, }