High-pT hadrons in pA and AA collisions: Impact of energy conservation. (10th March 2015)

• Record Type: Journal Article
• Authors: Kopeliovich, B Z; Nemchik, J; Potashnikova, I K; Schmidt, Ivàn
• Is Part Of: Journal of physics. Number 589 (2015)
• Page Start: 012013
• Publication Date: 2015-03-10
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/589/1/012013
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: The Cronin effect, which is nuclear enhancement of high- pT hadron production in pA collisions was successfully predicted prior the measurements at RHIC and LHC. The restrictions imposed by energy conservation lead to spectacular effects. Energy deficit becomes an issue for hadron production in pA collisions at large x L and/or large xT towards the kinematic bounds x L, T = 1. It leads to a suppression, which has been indeed observed for hadrons produced at forward rapidities and large pT . Intensive energy dissipation via gluon radiation by a highly virtual parton produced with large p T, makes impossible this process to continue long. Color neutralization and creation of a colorless dipole must occur promptly. When this happens inside a hot medium created in AA collisions, attenuation of dipoles, rather than induced energy loss, becomes a dominant mechanism for suppression of high- pT hadrons.