System-size dependence of transverse momentum correlations at sNN=62.4 and 200 GeV at the BNL Relativistic Heavy Ion Collider

Le résumé fourni par la source

We present a study of the average transverse momentum (${p}_{t}$) fluctuations and ${p}_{t}$ correlations for charged particles produced in Cu+Cu collisions at midrapidity for $\sqrt{{s}_{NN}}=$ 62.4 and 200 GeV. These results are compared with those published for Au+Au collisions at the same energies, to explore the system size dependence. In addition to the collision energy and system size dependence, the ${p}_{t}$ correlation results have been studied as functions of the collision centralities, the ranges in ${p}_{t}$, the pseudorapidity $\ensuremath{\eta}$, and the azimuthal angle $\ensuremath{\phi}$. The square root of the measured ${p}_{t}$ correlations when scaled by mean ${p}_{t}$ is found to be independent of both colliding beam energy and system size studied. Transport-based model calculations are found to have a better quantitative agreement with the measurements compared to models which incorporate only jetlike correlations.

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