Azimuthal anisotropy of charged particles at high transverse momenta in Pb-Pb collisions at √s NN=2.76TeV

Azimuthal anisotropy of charged particles at high transverse momenta in Pb-Pb collisions at √s NN=2.76TeV

The azimuthal anisotropy of charged particles in Pb-Pb collisions at √sNN=2.76  TeV is measured with the CMS detector at the LHC over an extended transverse momentum (pT) range up to approximately 60  GeV/c. The data cover both the low-pT region associated with hydrodynamic flow phenomena and the hi...

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Bibliographic Details
Main Authors: Bendavid, Joshua L., Busza, Wit, Butz, Erik M., Cali, Ivan Amos, Chan, M., Dutta, Valentina, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Hahn, Kristian Allan, Kim, Y., Klute, Markus, Li, W., Ma, Teng, Nahn, Steven, Paus, Christoph M. E., Ralph, Duncan Kelley, Rudolph, Matthew Scott, Stephans, George S. F., Stoeckli, Fabian, Sung, Kevin Kai Hong, Velicanu, Dragos Alexandru, Wenger, Edward Allen, Wyslouch, Boleslaw, Xie, Si, Yilmaz, Yetkin, Zanetti, Marco, Bauer, Gerry P, Lee, Yen-Jie, Luckey Jr, P David, Roland, Christof E, Roland, Gunther M, Sumorok, Konstanty C, Wolf, Roger, Yang, Mingming, Yoon, A. S.
Other Authors: Massachusetts Institute of Technology. Department of Chemical Engineering
Format: Article
Language:en_US
Published: American Physical Society 2012
Online Access:http://hdl.handle.net/1721.1/72206
https://orcid.org/0000-0002-3831-9071
https://orcid.org/0000-0003-3106-4894
https://orcid.org/0000-0001-6332-5839
https://orcid.org/0000-0001-8983-2169
https://orcid.org/0000-0002-1260-777X
https://orcid.org/0000-0002-6047-4211
https://orcid.org/0000-0003-3681-0649
https://orcid.org/0000-0003-2593-7767
https://orcid.org/0000-0002-0869-5631
Description
Summary:The azimuthal anisotropy of charged particles in Pb-Pb collisions at √sNN=2.76  TeV is measured with the CMS detector at the LHC over an extended transverse momentum (pT) range up to approximately 60  GeV/c. The data cover both the low-pT region associated with hydrodynamic flow phenomena and the high-pT region where the anisotropies may reflect the path-length dependence of parton energy loss in the created medium. The anisotropy parameter (v[subscript 2]) of the particles is extracted by correlating charged tracks with respect to the event-plane reconstructed by using the energy deposited in forward-angle calorimeters. For the six bins of collision centrality studied, spanning the range of 0–60% most-central events, the observed v[subscript 2] values are found to first increase with pT, reaching a maximum around pT=3  GeV/c, and then to gradually decrease to almost zero, with the decline persisting up to at least pT=40  GeV/c over the full centrality range measured.

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