2 dependence of < p i T > on N$_{part}$ is quite different for dif- ferent hadrons. Interactions transfer momentum between the different particles species and hence change < p i T > in the direction toward a thermal equilibrium. Therefore we do not expect that < p i T > follows eq.2 if final state interactions between the hadrons become important. Consequently, if eq. 2 is in agreement with data, we can draw conclusions on the reaction scenario. The NA49 collaboration [6] has recently analyzed the transverse mass spectrum of different hadrons in the framework of our model and has found good agreement with data. Therefore it is meaningful to continue here this analysis towards higher energies. dσ/dφ ∝ (1 + 2 $^{v$_{1}$}$· cos( φ ) + 2 $^{v$_{2}$}$· cos(2 φ )) of light quarks and gluons is isotropic and the anisotropy develops dur- ing the expansion as an image of the initial eccentricity ϵ$_{part}$ in coordinate space. This initial eccentricity has been calculated in a Glauber model or in a Color Glass Condensate approach. Taking this eccentricity as input, calculations based on ideal hydrodynamics reproduce the v$_{2}$/ϵ$_{part}$ observed in central AuAu collisions at RHIC. They predict, however, a centrality independent v$_{2}$/ϵ$_{part}$ value and fail therefore to describe the measured central- ity dependence of v$_{2}$/ϵ$_{part}$ which decreases by a factor of two from central to peripheral reactions. Drescher et al. [3] argue that this centrality depen- dence is a sign that the parton cross section in the quark gluon plasma, created presumably at RHIC energies, is too small in order to justify the application of ideal hy- drodynamics. It has to be replaced by viscous hydro- dynamics. They could show that the impact parameter dependence of v$_{2}$/ϵ$_{part}$ can be related to the Knudsen number and therefore to a finite viscosity. Later Luzum et al. [4] showed in viscous hydrodynamical calculations that different viscosities yield a different centrality de- pendence of v$_{2}$/ϵ$_{part}$ and of < p$_{T}$ > . Performing calcu- lations with different values for the viscosity they could identify the viscosity which fits best the 200 AGeV AuAu data and propose that this value is characteristic for the quark gluon plasma. More recently, Song et al. [5] have extended the calculation to the CuCu system. It is there- fore challenging to explore the predictions of the core - corona model for dynamical observables and to compare the results to data. The centrality dependence of < p i T > at midrapidity predicted by the core - corona model is given by where i characterizes the particle species i. < p i T >$_{corona}$ is the value of < p i T > measured in pp collisions at midra- pidity whereas < p i T >$_{core}$ is the value of < p i T > mea- sured in central heavy ion reactions at midrapidity. f i core is the centrality dependent fraction of core particles for the particles species i, given by If the system consists of particles of one species, final state interactions change neither < p$_{T}$ > nor v$_{2}$/ϵ$_{part}$ substantially. The former is due to (transverse) en- ergy conservation, the latter due to the small momen- tum transfer in final state interactions as compared to the momentum of the particles. It is also not important whether some corona particles are absorbed by the core. This increases the core fraction but simultaneously low- ers < p$_{T}$ >$_{core}$ . Both effects compensate as long as the total transverse energy is conserved. This observation is not anymore true if the systems contains different particles species i. As we will see, the We see that < p i $_{T}$( N$_{part}$ ) > , calculated with help of eq. 2, agrees quantitatively with the data for the different hadrons. Also the experimentally observed different de- pendencies of < p i $_{T}$( N$_{part}$ ) > for different particle species i is well reproduced. We note in passing that replacing In fig. 2 we compare our predictions with published [7–9] and preliminary [10, 11] STAR data, in fig. 3 with PHENIX data [12]. In fig. 2 the theoretical and experi- mental values of protons ( φ ) are multiplied by a factor of 1.75(1.4) to separate the curves. The STAR proton data show (in contradistinction to the proton data of PHENIX and to those of all other hadrons) a strong increase of < p$_{T}$ > for N$_{part}$ > 100. We have therefore multiplied the experimental < p$_{T}$ >$_{core}$ by 0.9. FIG. 2: < p i T > as a function of the centrality for different particle species i. The STAR data [7–11] are presented by symbols, the calculations, eq.2, by lines. Full (open) symbols refer to CuCu (AuAu). The < p T > values of protons ( φ ) are multiplied by a factor of 1.75(1.4). f i core = $^{f$_{core}$}$· M i core $^{f$_{core}$}$· M i core $^{+ (1}$− f$_{core}$ $^{)}$· M i corona . (3) < p i T > ( N$_{part}$ ) (2) = f i core · < p i T >$_{core}$ $^{+(1}$− f i $^{$_{core}$)}$· < p i T >$_{corona}$ . 0.0 0.5 1.0 1.5 2.0 0 100 200 300 400 500 - K - p