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Measurement with the ATLAS detector of multi-particleazimuthal correlations in p plus Pb collisions at root s(NN)=5.02 TeV
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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2013 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 725, no 1-3, 60-78 p.Article in journal (Refereed) Published
Abstract [en]

In order to study further the long-range correlations ("ridge") observed recently in p + Pb collisions at root s(NN) = 5.02 TeV, the second-order azimuthal anisotropy parameter ofcharged particles, v(2), has been measured with the cumulant method using the ATLASdetector at the LHC. In a data sample corresponding to an integrated luminosity ofapproximately 1 mu b(-1), the parameter v(2) has been obtained using two- and four-particlecumulants over the pseudorapidity range vertical bar eta vertical bar < 2.5. The results are presented as a function of transverse momentum and the event activity, defined in terms of thetransverse energy summed over 3.1 < eta < 4.9 in the direction of the Pb beam. They show features characteristic of collective anisotropic flow, similar to that observed in Pb + Pb collisions. A comparison is made to results obtained using two-particle correlation methods, and to predictions from hydrodynamic models of p + Pb collisions. Despite the small transverse spatial extent of the p + Pb collision system, the large magnitude of v(2) and its similarity to hydrodynamic predictions provide additional evidence for the importance of final-state effects in p + Pb reactions.

Place, publisher, year, edition, pages
2013. Vol. 725, no 1-3, 60-78 p.
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Natural Sciences
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URN: urn:nbn:se:uu:diva-207089DOI: 10.1016/j.physletb.2013.06.057OAI: oai:DiVA.org:uu-207089DiVA: diva2:646540
Note

ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1016/j.physletb.2013.06.057

Available from: 2013-09-09 Created: 2013-09-09 Last updated: 2017-12-06Bibliographically approved

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Brenner, RichardBuszello, Claus PConiavitis, EliasEkelöf, TordEllert, MattiasFerrari, ArnaudIsaksson, CharlieMadsen, AlexanderPelikan, Daniel
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