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Measurement of forward-backward multiplicity correlations in lead-lead, proton-lead, and proton-proton collisions with the ATLAS detector
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
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Number of Authors: 2860
2017 (English)In: Physical review C, ISSN 2469-9985, Vol. 95, no 6, 064914Article in journal (Refereed) Published
Abstract [en]

Two-particle pseudorapidity correlations are measured in root s(NN) = 2.76 TeV Pb + Pb, root s(NN) = 5.02 TeV p+Pb, and root s = 13 TeV pp collisions at the Large Hadron Collider (LHC), with total integrated luminosities of approximately 7 mu b(-1), 28 nb(-1), and 65 nb(-1), respectively. The correlation function CN(eta(1),eta(2))is measured as a function of event multiplicity using charged particles in the pseudorapidity range |eta| < 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 + < a(1)(2)>(1/2) eta(1) eta(2) in all collision systems over the full multiplicity range. The values of < a(1)(2)>(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 < a(1)(2)>(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 eta than in pp collisions with comparable multiplicity.

Place, publisher, year, edition, pages
2017. Vol. 95, no 6, 064914
National Category
Subatomic Physics
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URN: urn:nbn:se:uu:diva-331597DOI: 10.1103/PhysRevC.95.064914ISI: 000404470800003OAI: oai:DiVA.org:uu-331597DiVA: diva2:1149395
Note

ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevC.95.064914

Available from: 2017-10-16 Created: 2017-10-16 Last updated: 2017-10-16Bibliographically approved

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Bergeås, Elin KuutmannBrenner, RichardEkelöf, TordEllert, MattiasFerrari, ArnaudGradin, P.O. JoakimMadsen, AlexanderÖhman, HenrikRangel-Smith, Camilla
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