High-pT hadrons in pA and AA collisions: Impact of energy conservation

9th International Workshop on High-pT Physics at LHC

Kopeliovich, B.Z.^1 ; Nemchik, J.^2,3,4 ; Potashnikova, I.K.^1 ; Schmidt, Ivàn^1

Departamento de Física, Universidad Técnica Federico Santa María, Chile^1

Centro Científico-Tecnológico de Valparaíso, Avda. España 1680, Valparaíso, Chile^2

Czech Technical University in Prague, FNSPE, Behová 7, Prague

11519, Czech Republic^3

Institute of Experimental Physics SAS, Watsonova 47, Koice

04001, Slovakia^4

关键词: Cronin effect;    Dominant mechanism;    Energy deficit;    Forward rapidity;    Gluon radiation;    Hadron production;    Induced energy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/589/1/012013/pdf
DOI  :  10.1088/1742-6596/589/1/012013

来源: IOP

【 摘 要 】

The Cronin effect, which is nuclear enhancement of high-pThadron 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 xLand/or large xTtowards the kinematic bounds xL,T1. 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 pT, 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-pThadrons.