Measurement with the ATLAS detector of multi-particle azimuthal correlations in p+Pb collisions at $\sqrt{s_{NN}}$ =5.02 TeV

Aad, Georges; Abajyan, Tatevik; Abbott, Brad; Abdallah, Jalal; Abdel Khalek, Samah; Abdelalim, Ahmed Ali; Abdinov, Ovsat; Aben, Rosemarie; Abi, Babak; Abolins, Maris

doi:10.1016/j.physletb.2013.06.057

Measurement with the ATLAS detector of multi-particle azimuthal correlations in p+Pb collisions at $\sqrt{s_{NN}}$ =5.02 TeV

ATLAS

Collaboration

Mar 8, 2013

8 pages

Published in:

Phys.Lett.B 725 (2013) 60-78

Published: Aug 9, 2013

e-Print:

1303.2084 [hep-ex]

DOI:

10.1016/j.physletb.2013.06.057

Report number:

CERN-PH-EP-2013-029

Experiments:

CERN-LHC-ATLAS

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Abstract: (Elsevier)

In order to study further the long-range correlations (“ridge”) observed recently in p+Pb collisions at

\sqrt{s_{NN}}

= 5:02 TeV, the second-order azimuthal anisotropy parameter of charged particles,

v_2

, has been measured with the cumulant method using the ATLAS detector at the LHC. In a data sample corresponding to an integrated luminosity of approximately 1 microbarn-1, the parameter

v_2

has been obtained using two- and four-particle cumulants over the pseudorapidity range |

\eta

| < 2.5. The results are presented as a function of transverse momentum and the event activity, defined in terms of the transverse 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.

Note:

8 pages plus author list (23 pages total), 4 figures, 1 table, submitted to Physics Letters B, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2013-01/ Revised version corresponds to submitted version

p nucleus: nuclear reaction
lead
rapidity: correlation
angular distribution: anisotropy
correlation: two-particle
correlation: long-range
hydrodynamics
flow: anisotropy
ATLAS
angular correlation: ((n)particle)

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Measurement with the ATLAS detector of multi-particle azimuthal correlations in p+Pb collisions at sNN\sqrt{s_{NN}}sNN​​ =5.02 TeV

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Measurement with the ATLAS detector of multi-particle azimuthal correlations in p+Pb collisions at $\sqrt{s_{NN}}$ =5.02 TeV