Abstract: | 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 same energies, to explore the
system size dependence. In addition to the collision energy and system size
dependence, the $p_t$ correlations results have been studied as functions of
the collision centralities, the ranges in $p_t$, the pseudo-rapidity $eta$,
and the azimuthal angle $phi$, for which the correlations are measured. The
square root of the measured $p_t$ correlations when scaled by mean-$p_t$ are
found to be independent of both colliding beam energy and system size studied.
The transport based model calculations are found to have a better quantitative
agreement with the measurements compared to models which incorporate only
jet-like correlations. |