Cold nuclear matter effect measured with high pT hadrons and jets in 200GeV d+Au collisions in PHENIX

TL;DR

This paper reports measurements of high pT hadrons and jets in 200 GeV d+Au collisions at RHIC, revealing a strong centrality dependence of nuclear modification factors that challenges existing theoretical models.

Contribution

It provides new high-statistics measurements of R_{dA} and R_{cp} for high pT particles and jets, highlighting discrepancies with theoretical expectations.

Findings

R_{dA} and R_{cp} are consistent across observables within uncertainties.

R_{dA} shows a strong dependence on collision centrality.

Experimental explanation for the centrality dependence is proposed.

Abstract

High pT \pi^0 and \eta, as well as jets are measured using high statistics d+Au collision data collected in RHIC Year-2008 run. Both R_{dA} and R_{cp} for three observables are found to be very consistent each other within quoted systematic and statistical uncertainties. It was found that the R_{dA} is strongly centrality dependent as opposed to the expectations from theoretical models. An explanation of the centrality dependence from the experimental point of view is presented.