Describing Ridge behavior via kinematic model

초록

The Ridge behavior in high-multiplicity proton-proton collisions has been discussed a lot since it was first reported in year. Because small systems like proton-protoncollisions can not provide sufficient conditions to produce a medium called Quark-Gluon Plasma (QGP), in which the Ridge behavior is understood with high-orderflows. In this work, we propose the pure kinematic mechanism between jets and medium partons as tools for describing the Ridge behavior; while jets pass through themedium, the momentum transferred from jets to medium partons is in the direction of jets’ motion resulting in the collective motion of the medium. In practical calculation, the information of the initial medium parton is necessary to describe the scattering process kinematically. In this work, we choose partondistribution functions from the hard scattering model (phPDh) close to the PYTHIA simulation. The phPDh is parameterized by a fallout parameter, a, a non-extensiveparameter, q, and the temperature of the system, T; a decides the shape of rapidity distribution, and q affects rapidity and transverse momentum distribution. And T is related to transverse momentum distribution. Compared to the PYTHIA simulation, we get proper values of a= 85, q= 1.15, and T= 145MeV. We calculate a two-particleangular correlation using phPDh. We check the tendencies of the correlation for various energy losses of jet particles, the angle of jet particles after collisions, and soon.