GLYPH<s48> GLYPH<s53>GLYPH<s48> GLYPH<s49>GLYPH<s48>GLYPH<s48> GLYPH<s49>GLYPH<s53>GLYPH<s48> GLYPH<s50>GLYPH<s48>GLYPH<s48> GLYPH<s50>GLYPH<s53>GLYPH<s48> GLYPH<s51>GLYPH<s48>GLYPH<s48> GLYPH<s51>GLYPH<s53>GLYPH<s48> GLYPH<s48>GLYPH<s46>GLYPH<s48> GLYPH<s48>GLYPH<s46>GLYPH<s49> GLYPH<s48>GLYPH<s46>GLYPH<s50> GLYPH<s48>GLYPH<s46>GLYPH<s51> GLYPH<s48>GLYPH<s46>GLYPH<s52> GLYPH<s48>GLYPH<s46>GLYPH<s53> GLYPH<s48>GLYPH<s46>GLYPH<s54> GLYPH<s48>GLYPH<s46>GLYPH<s55> GLYPH<s48>GLYPH<s46>GLYPH<s56> GLYPH<s48>GLYPH<s46>GLYPH<s57> GLYPH<s49>GLYPH<s46>GLYPH<s48> GLYPH<s49>GLYPH<s46>GLYPH<s49> GLYPH<s49>GLYPH<s46>GLYPH<s50> GLYPH<s60> GLYPH<s32> GLYPH<s112> GLYPH<s84> GLYPH<s32> GLYPH<s62> GLYPH<s32> GLYPH<s40> GLYPH<s71> GLYPH<s101> GLYPH<s86> GLYPH<s47> GLYPH<s99> GLYPH<s41> GLYPH<s60>GLYPH<s32>GLYPH<s78> GLYPH<s112>GLYPH<s97>GLYPH<s114>GLYPH<s116> GLYPH<s32>GLYPH<s62> GLYPH<s32> GLYPH<s83>GLYPH<s84>GLYPH<s65>GLYPH<s82> GLYPH<s32> GLYPH<s40>GLYPH<s99>GLYPH<s104>GLYPH<s97>GLYPH<s114>GLYPH<s103> GLYPH<s101>GLYPH<s100>GLYPH<s32> GLYPH<s104>GLYPH<s97>GLYPH<s100>GLYPH<s114>GLYPH<s111>GLYPH<s110>GLYPH<s115>GLYPH<s41> GLYPH<s32> GLYPH<s100> GLYPH<s71> GLYPH<s61>GLYPH<s49>GLYPH<s54> GLYPH<s32> GLYPH<s100> GLYPH<s71> GLYPH<s61>GLYPH<s52>GLYPH<s48> FIG. 5: (Color online) Mean transverse momentum at midrapidity as a function of number of participating nucleons, compared with the STAR data [31]. transverse energy during the expansion, which is the consequence of the same viscous effect regardless of the details of microscopical processes. On the contrary, the mean parton transverse momentum shown in Fig. 5 does depend on the details of microscopical processes. The larger the number of parton degrees of freedom, the smaller is the final mean transverse momentum. Suppose the system is in full thermal equilibrium, we obtain the energy density e ∼ d$_{G}$T 4 and the particle density n ∼ d$_{G}$T 3 ∼ d 1 / 4 G e 3 / $^{4}$. Similar as the decrease of the transverse energy the local energy density is not sensitive to d$_{G}$ . Thus, n ∼ d 1 / 4 G and the particle number with d$_{G}$ = 40 is a factor of 1 . 26 more than that with d$_{G}$ = 16. Therefore, to the maximum (in case of thermal equilibrium) the mean transverse momentum will be reduced by a factor of 1 . 26, when d$_{G}$ is enlarged from 16 to 40. From Fig. 5 we realize an average reduction by a factor of 1 . 2, which is less than the maximum reduction. This indicates that full thermalization is not immediately achieved and particularly the net particle production (chemical equilibration) in the calculations with d$_{G}$ = 40 is less complete at the freeze-out than for the pure gluon system ( d$_{G}$ = 16). The reason is that for the same initial condition the system with d$_{G}$ = 40 is initially farther apart from full chemical equilibrium than the system with d$_{G}$ = 16 (see Fig. 10). Because 11