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26 April 2024

» arxiv » 0903.2811

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High transverse momentum triggered correlations over a large pseudorapidity acceptance in Au+Au collisions at sqrt(s_NN)=200 GeV
B.Alver ; B.B.Back ; M.D.Baker ; M.Ballintijn ; D.S.Barton ; R.R.Betts ; A.A.Bickley ; R.Bindel ; W.Busza ; A.Carroll ; Z.Chai ; V.Chetluru ; M.P.Decowski ; E.García ; T.Gburek ; N.George ; K.Gulbrandsen ; C.Halliwell ; J.Hamblen ; M.Hauer ; C.Henderson ; D.J.Hofman ; R.S.Hollis ; R.Hołyński ; B.Holzman ; A.Iordanova ; E.Johnson ; J.L.Kane ; N.Khan ; P.Kulinich ; C.M.Kuo ; W.Li ; W.T.Lin ; C.Loizides ; S.Manly ; A.C.Mignerey ; R.Nouicer ; A.Olszewski ; R.Pak ; C.Reed ; C.Roland ; G.Roland ; J.Sagerer ; H.Seals ; I.Sedykh ; C.E.Smith ; M.A.Stankiewicz ; P.Steinberg ; G.S.F.Stephans ; A.Sukhanov ; M.B.Tonjes ; A.Trzupek ; C.Vale ; G.J.van Nieuwenhuizen ; S.S.Vaurynovich ; R.Verdier ; G.I.Veres ; P.Walters ; E.Wenger ; F.L.H.Wolfs ; B.Wosiek ; K.Woźniak ; B.Wyslouch ;
Date:	16 Mar 2009
Abstract:	A measurement of two-particle correlations with a high transverse momentum trigger particle (p_T^{trig} > 2.5 GeV/c) is presented for Au+Au collisions at sqrt(s_NN)=200 GeV over the uniquely broad longitudinal acceptance of the PHOBOS detector (-4 < Deltaeta < 2). A broadening of the away-side azimuthal correlation compared to elementary collisions is observed at all Deltaeta. As in p+p collisions, the near-side is characterized by a peak of correlated partners at small angle relative to the trigger. However, in central Au+Au collisions an additional correlation extended in Deltaeta and known as the ’ridge’ is found to reach at least \|Deltaeta\| approx 4. The ridge yield is largely independent of Deltaeta over the measured range, and it decreases towards more peripheral collisions. For the chosen p_T^{trig} cut of 2.5 GeV/c, the ridge yield is consistent with zero for events with less than roughly 100 participating nucleons.
Source:	arXiv, 0903.2811
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