Two-particle pseudorapidity correlations are measured in √sNN = 2.76 TeV Pb + Pb, √sNN = 5.02 TeV p+Pb, and √s = 13 TeV pp collisions at the Large Hadron Collider (LHC), with total integrated luminosities of approximately 7μb−1, 28 nb−1 , and 65 nb−1 , respectively. The correlation function CN(η1,η2) is measured as a function of event multiplicity using charged particles in the pseudorapidity range |η| < 2.4. The correlation function contains a significant short-range component, which is estimated and subtracted. After removal of the short-range component, the shape of the correlation function is described approximately by 1 + a2 1  1/2 η1η2 in all collision systems over the full multiplicity range. The values of a2 1  1/2 are consistent for the opposite-charge pairs and same-charge pairs, and for the three collision systems at similar multiplicity. The values of a2 1  1/2 and the magnitude of the short-range component both follow a power-law dependence on the event multiplicity. The short-range component in p + Pb collisions, after symmetrizing the proton and lead directions, is found to be smaller at a given η than in pp collisions with comparable multiplicity

Title

Physical Review C

Publisher

American Physical Society

Publisher Country

United States of America

Indexing

Thomson Reuters

Impact Factor

41.426

Publication Type

Prtinted only

Volume

95

Year

2017

Pages

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