Reaction plane angle dependence of dihadron azimuthal correlations from a multiphase transport model calculation - Nuclear Theory

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Abstract: Dihadron azimuthal angle correlations relative to the reaction plane havebeen investigated in Au + Au collisions at $\sqrt{s {NN}}$ = 200 GeV using amulti-phase transport model AMPT. Such reaction plane azimuthal angledependent correlations can shed light on path-length effect of energy loss ofhigh transverse momentum particles propagating through the hot dense medium.The correlations vary with the trigger particle azimuthal angle with respect tothe reaction plane direction, $\phi {s}=\phi {T}-\Psi {EP}$, which isconsistent with the experimental observation by the STAR collaboration. Thedihadron azimuthal angle correlation functions on the away side of the triggerparticle present a distinct evolution from a single peak to a broad, possiblydouble peak, structure when the trigger particle direction goes from in-planeto out-of-plane of the reaction plane. The away-side angular correlationfunctions are asymmetric with respect to the back-to-back direction in someregions of $\phi {s}$, which could provide insight on testing $v {1}$ method toreconstruct the reaction plane. In addition, both the root-mean-square width$W {rms}$ of the away-side correlation distribution and the splittingparameter $D$ between the away-side double peaks increase slightly with$\phi {s}$, and the average transverse momentum of the away-side associatedhadrons shows a strong $\phi {s}$ dependence. Our results indicate that strongparton cascade and resultant energy loss could play an important role for theappearance of a double-peak structure in the dihadron azimuthal angularcorrelation function on the away side of the trigger particle.

Autor: W. Li, S. Zhang, Y. G. Ma, X. Z. Cai, J. H. Chen, H. Z. Huang, G. L. Ma, C. Zhong

Fuente: https://arxiv.org/