Centrality and pseudorapidity dependence of the transverse energy density in <i>p</i>Pb collisions ats √<i>s<sub>NN</sub></i>=5.02 TeV

Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Asilar, E, Bergauer, T, Brandstetter, J, Brondolin, E, Dragicevic, M, Ero, J
et al (show 2249 more authors) (2019) Centrality and pseudorapidity dependence of the transverse energy density in <i>p</i>Pb collisions ats √<i>s<sub>NN</sub></i>=5.02 TeV. PHYSICAL REVIEW C, 100 (2). 024902-.

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The almost hermetic coverage of the CMS detector is used to measure the distribution of transverse energy, ET, over 13.2 units of pseudorapidity, η, for pPb collisions at a center-of-mass energy per nucleon pair of √sNN=5.02 TeV. The huge angular acceptance exploits the fact that the CASTOR calorimeter at -6.6 < η < -5.2 is effectively present on both sides of the colliding system because of a switch in the proton-going and lead-going beam directions. This wide acceptance enables the study of correlations between well-separated angular regions and makes the measurement a particularly powerful test of event generators. For minimum bias pPb collisions the maximum value of dET/dη is 22 GeV, which implies an ET per participant nucleon pair comparable to that of peripheral PbPb collisions at √sNN= 2.76 TeV. The increase of dET/dη with centrality is much stronger for the lead-going side than for the proton-going side. The η dependence of dET/dη is sensitive to the η range in which the centrality variable is defined. Several modern generators are compared to these results but none is able to capture all aspects of the η and centrality dependence of the data and the correlations observed between different η regions.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 04 Dec 2019 15:16
Last Modified: 17 Mar 2024 04:58
DOI: 10.1103/PhysRevC.100.024902
Open Access URL: https://doi.org/10.1103/PhysRevC.100.024902
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3064807