Harmonic decomposition of two particle angular correlations in Pb–Pb collisions at √sNN = 2.76 TeV

Aamodt, K.; ...; Antičić, Tome; ...; Gotovac, Sven; ...; Mudnić, Eugen; ...; Šuša, Tatjana; ...; Vicković, Linda; ...; Zynovyev, M.

doi:10.1016/j.physletb.2012.01.060

Pregled bibliografske jedinice broj: 592889

Harmonic decomposition of two particle angular correlations in Pb–Pb collisions at √sNN = 2.76 TeV

Aamodt, K.; ...; Antičić, Tome; ...; Gotovac, Sven; ...; Mudnić, Eugen; ...; Šuša, Tatjana; ... et al.

Harmonic decomposition of two particle angular correlations in Pb–Pb collisions at √sNN = 2.76 TeV // Physics letters. B, 708 (2012), 3/5; 249-264 doi:10.1016/j.physletb.2012.01.060 (međunarodna recenzija, članak, znanstveni)

CROSBI ID: 592889 Za ispravke kontaktirajte CROSBI podršku putem web obrasca

Naslov
Harmonic decomposition of two particle angular correlations in Pb–Pb collisions at √sNN = 2.76 TeV

Autori
Aamodt, K. ; ... ; Antičić, Tome ; ... ; Gotovac, Sven ; ... ; Mudnić, Eugen ; ... ; Šuša, Tatjana ; ... ; Vicković, Linda ; ... ; Zynovyev, M.

Izvornik
Physics letters. B (0370-2693) 708 (2012), 3/5; 249-264

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
ALICE; LHC; CERN; PbPb; 2.76 TeV; Angular correlations

Sažetak
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 < pTt, a < 15 GeV/c, where pTt > pTa. 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 VnDelta ≡ cos(nDeltaφ) 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 VnDelta(pTt, pTa) is fully described in terms of single-particle anisotropies vn(pT) as VnDelta(pTt, pTa) = vn(pTt)vn(pTa). This expectation is tested for 1 <= n <= 5 by applying a global fit of all VnDelta(pTt, pTa) to obtain the best values vn{; ; ; ; GF}; ; ; ; (pT). It is found that for 2<=n<=5, the fit agrees well with data up to pTa ∼ 3–4 GeV/c, with a trend of increasing deviation as pTt and pTa 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 pTa<4 GeV/c. For the n = 1 harmonic, however, a single v1(pT) curve is not obtained even within the reduced range pTa <4 GeV/c.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
ALICE Collaboration

POVEZANOST RADA

Projekti:
098-0982887-2878 - Eksperimentalna fizika na LHC energijama (Kadija, Krešo, MZOS ) ( CroRIS)

Ustanove:
Fakultet elektrotehnike, strojarstva i brodogradnje, Split,
Institut "Ruđer Bošković", Zagreb

Profili:

Tatjana Šuša (autor)