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Measurement of two-particle correlations with respect to second- and third-order event planes in Au$$+$$Au collisions at $$sqrt{s_{_{NN}}}=200$$ GeV

Adare, A.*; Hasegawa, Shoichi   ; Imai, Kenichi; Nagamiya, Shoji*; Sako, Hiroyuki   ; Sato, Susumu  ; Tanida, Kiyoshi   ; PHENIX Collaboration*; 451 of others*

We present measurements of azimuthal correlations of charged hadron pairs in $$sqrt{s_{_{NN}}}=200$$ GeV Au$$+$$Au collisions after subtracting an underlying event using a model that includes higher-order azimuthal anisotropy $$v_2$$, $$v_3$$, and $$v_4$$. After subtraction, the away-side ($$Deltaphisimpi)$$ of the highest transverse-momentum trigger ($$p_T > 4$$ GeV/$$c$$) correlations is suppressed compared to that of correlations measured in $$p$$$$+$$$$p$$ collisions. At the lowest associated particle $$p_T$$, the away-side shape and yield are modified. These observations are consistent with the scenario of radiative-jet energy loss. For the lowest-$$p_T$$ trigger correlations, an away-side yield exists and we explore the dependence of the shape of the away-side within the context of an underlying-event model. Correlations are also studied differentially versus event-plane angle $$Psi_n$$. The angular correlations show an asymmetry when selecting the sign of the trigger-particle azimuthal angle with respect to the $$Psi_2$$ event plane. This asymmetry and the measured suppression of the pair yield out of plane is consistent with a path-length-dependent energy loss. No $$Psi_3$$ dependence can be resolved within experimental uncertainties.



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Category:Physics, Nuclear



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