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Measurement of the centrality dependence of the charged-particle pseudorapidity distribution in proton–lead collisions at √sNN = 5.02 TeV with the ATLAS detector

Aad, G; Abajyan, T.; Abbott, B.; Abdallah, J; Abdel Khalek, S; Abdinov, O; Åkesson, Torsten LU ; Bocchetta, Simona LU ; Bryngemark, Lene LU and Floderus, Anders LU , et al. (2016) In European Physical Journal C 76(4).
Abstract
The centrality dependence of the mean charged-particle multiplicity as a function of pseudorapidity is measured in approximately 1 (Formula presented.) b (Formula presented.) of proton–lead collisions at a nucleon–nucleon centre-of-mass energy of (Formula presented.)   (Formula presented.) using the ATLAS detector at the Large Hadron Collider. Charged particles with absolute pseudorapidity less than 2.7 are reconstructed using the ATLAS pixel detector. The p + Pb collision centrality is characterised by the total transverse energy measured in the Pb-going direction of the forward calorimeter. The charged-particle pseudorapidity distributions are found to vary strongly with centrality, with an increasing asymmetry between the proton-going... (More)
The centrality dependence of the mean charged-particle multiplicity as a function of pseudorapidity is measured in approximately 1 (Formula presented.) b (Formula presented.) of proton–lead collisions at a nucleon–nucleon centre-of-mass energy of (Formula presented.)   (Formula presented.) using the ATLAS detector at the Large Hadron Collider. Charged particles with absolute pseudorapidity less than 2.7 are reconstructed using the ATLAS pixel detector. The p + Pb collision centrality is characterised by the total transverse energy measured in the Pb-going direction of the forward calorimeter. The charged-particle pseudorapidity distributions are found to vary strongly with centrality, with an increasing asymmetry between the proton-going and Pb-going directions as the collisions become more central. Three different estimations of the number of nucleons participating in the p + Pb collision have been carried out using the Glauber model as well as two Glauber–Gribov inspired extensions to the Glauber model. Charged-particle multiplicities per participant pair are found to vary differently for these three models, highlighting the importance of including colour fluctuations in nucleon–nucleon collisions in the modelling of the initial state of p + Pb collisions. © 2016, The Author(s). (Less)
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European Physical Journal C
volume
76
issue
4
publisher
Springer Berlin Heidelberg
external identifiers
  • scopus:84964402889
ISSN
1434-6044
DOI
10.1140/epjc/s10052-016-4002-3
language
English
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yes
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436f15f0-dde4-4c4a-99ef-8ab34d3ec673
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2018-05-23 14:43:43
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2019-05-21 04:06:14
@article{436f15f0-dde4-4c4a-99ef-8ab34d3ec673,
  abstract     = {The centrality dependence of the mean charged-particle multiplicity as a function of pseudorapidity is measured in approximately 1 (Formula presented.) b (Formula presented.) of proton–lead collisions at a nucleon–nucleon centre-of-mass energy of (Formula presented.)   (Formula presented.) using the ATLAS detector at the Large Hadron Collider. Charged particles with absolute pseudorapidity less than 2.7 are reconstructed using the ATLAS pixel detector. The p + Pb collision centrality is characterised by the total transverse energy measured in the Pb-going direction of the forward calorimeter. The charged-particle pseudorapidity distributions are found to vary strongly with centrality, with an increasing asymmetry between the proton-going and Pb-going directions as the collisions become more central. Three different estimations of the number of nucleons participating in the p + Pb collision have been carried out using the Glauber model as well as two Glauber–Gribov inspired extensions to the Glauber model. Charged-particle multiplicities per participant pair are found to vary differently for these three models, highlighting the importance of including colour fluctuations in nucleon–nucleon collisions in the modelling of the initial state of p + Pb collisions. © 2016, The Author(s).},
  author       = {Aad, G and Abajyan, T. and Abbott, B. and Abdallah, J and Abdel Khalek, S and Abdinov, O and Åkesson, Torsten and Bocchetta, Simona and Bryngemark, Lene and Floderus, Anders and Hawkins, Anthony and Hedberg, Vincent and Jarlskog, Göran and Lytken, Else and Meirose, Bernhard and Mjörnmark, Ulf and Smirnova, Oxana and Viazlo, Oleksandr and Wielers, Monika and , },
  issn         = {1434-6044},
  language     = {eng},
  number       = {4},
  publisher    = {Springer Berlin Heidelberg},
  series       = {European Physical Journal C},
  title        = {Measurement of the centrality dependence of the charged-particle pseudorapidity distribution in proton–lead collisions at √sNN = 5.02 TeV with the ATLAS detector},
  url          = {http://dx.doi.org/10.1140/epjc/s10052-016-4002-3},
  volume       = {76},
  year         = {2016},
}