Neutral pion production in =200 GeV Cu+Au collisions at PHENIX

Hot Quarks 2014: Workshop for young scientists on the physics of ultrarelativistic nucleus-nucleus collisions

Campbell, Sarah^1

Buidling 510C, PHENIX Brookhaven National Laboratory, Upton

NY

11973, United States^1

关键词: Au+Au collisions;    Azimuthal angle;    Collision geometry;    Core coronas;    Neutral pions;    Parton energy loss;    Path length;    Quark-gluon plasma;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/612/1/012004/pdf
DOI  :  10.1088/1742-6596/612/1/012004

来源: IOP

【 摘 要 】

Cu+Au collisions at RHIC generate asymmetric initial geometries and densities in both azimuth and rapidity. High pTπ0s produced in √sNN= 200 GeV Cu+Au collisions provide new environments to study parton energy loss in the Quark Gluon Plasma, including very central events where the Cu nucleus is enveloped by the Au nucleus. By measuring π0yields in φ relative to the event plane, we can probe different core-corona regions in these very central events and study the path length dependence of energy loss in various lopsided initial geometries. PHENIX has observed the suppression of π0s as a function of the azimuthal angle with respect to the event plane in √sNN= 200 GeV Au+Au collisions and found it consistent with a larger than quadratic path length dependence suggesting a non-perturbative energy loss model applies. The unique collision geometries available in Cu+Au provide new settings to explore and possibly confirm this path length dependence. The status of the Cu+Au π0analysis is presented.