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p\bf p-p\bf p minimum-bias dijets and nonjet quadrupole in relation to conjectured collectivity (flows) in high-energy nuclear collisions

Published 6 Dec 2015 in hep-ph | (1512.01857v1)

Abstract: Recent observations of ridge-like structure in pp-pp and pp-AA angular correlations at the RHIC and LHC have been interpreted to imply collective motion in smaller collision systems. It is argued that if correlation structures accepted as manifestations of flow in AA-AA collisions appear in smaller systems collectivity (flow) must extend to the smaller systems. But the argument could be reversed to conclude that such structures appearing in AA-AA collisions may not imply hydrodynamic flow. I present spectrum, correlation and fluctuation data from RHIC pp-pp and Au-Au collisions and pp-pp, pp-Pb and Pb-Pb results from the LHC described accurately by a two-component (soft+dijet) model of hadron production. I also present evidence for a significant pp-pp nonjet (NJ) quadrupole (v2v_2) component with nchn_{ch} systematics directly related to AA-AA NJ quadrupole systematics. The combination suggests that soft, dijet and NJ quadrupole components are distinct phenomena in all cases, inconsistent with hadron production from a common bulk medium exhibiting collective motion (flow).

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