Abstract

Angular correlations between unidentified charged trigger (t) and associated (a) particles are measured by the ALICE experiment in Pb–Pb collisions at √sNN = 2.76 TeV for transverse momenta 0.25 < pt,aT < 15 GeV/c, where ptT > paT . The shapes of the pair correlation distributions are studied in a variety of collision centrality classes between 0 and 50% of the total hadronic cross section for particles in the pseudorapidity interval |η| < 1.0. Distributions in relative azimuth φ ≡ φt − φa are analyzed for |η| ≡ |ηt − ηa| > 0.8, and are referred to as “long-range correlations”. Fourier components Vn ≡ cos(nφ) are extracted from the long-range azimuthal correlation functions. If particle pairs are correlated to one another through their individual correlation to a common symmetry plane, then the pair anisotropy Vn(ptT , paT ) is fully described in terms of single-particle anisotropies vn(pT ) as Vn(ptT , paT ) = vn(ptT )vn(paT ). This expectation is tested for 1 n 5 by applying a global fit of all Vn(ptT , paT ) to obtain the best values vn{GF}(pT ). It is found that for 2n5, the fit agrees well with data up to paT∼ 3–4 GeV/c, with a trend of increasing deviation as ptT and paT are increased or as collisions become more peripheral. This suggests that no pair correlation harmonic can be described over the full 0.25 < pT < 15 GeV/c range using a single vn(pT ) curve; such a description is however approximately possible for 2 n 5 when paT <4 GeV/c. For the n = 1 harmonic, however, a single v1(pT ) curve is not obtained even within the reduced range paT <4 GeV/c.

Autore Pugliese

• Bruno Giuseppe Eugenio

Tutti gli autori

• BRUNO G.E. , et al.

Titolo volume/Rivista

PHYSICS LETTERS. SECTION B

Anno di pubblicazione

2012

ISSN

0370-2693

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

Non Disponibile

Numero di citazioni Scopus

144

Ultimo Aggiornamento Citazioni

2017-04-23 03:20:56

Settori ERC

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Codici ASJC

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