Abstract
The two component Monte-Carlo Glauber model predicts a knee-like structure in the centrality dependence of elliptic flow $v_2$ in Uranium+Uranium collisions at $\sqrt{s_{NN}}=193$ GeV. It also produces a strong anti-correlation between $v_2$ and $dN_{ch}/dy$ in the case of top ZDC events. However, none of these features have been observed in data. We address these discrepancies by including the effect of nucleon shadowing to the two component Monte-Carlo Glauber model. Apart from addressing successfully the above issues, we find that the nucleon shadow suppresses the event by event fluctuation of various quantities, e.g. $\varepsilon_2$ which is in accordance with expectation from the dynamical models of initial condition based on gluon saturation physics.
Highlights
The two component Monte-Carlo Glauber model predicts a knee-like structure in the centrality dependence of elliptic flow v2 in Uranium+Uranium collisions at √sNN = 193 GeV
The prolate shape of the U nucleus implies a knee-like structure in the centrality dependence of elliptic flow v2 [15, 16]
Our results indicate that nucleon shadowing in heavy ion collision (HIC) has crucial consequences on several observables
Summary
I i where wi is source weight factor. In the simplest case it can be just taken as a constant n0 equal to the average dNch/dy for p-p collision. In this work we follow the same strategy and consider NBD fluctuations in the wis to generate multiplicity. For the energy deposition scheme we have not considered any additional fluctuation as in Ref. [24] and just considered wi = ǫ0, a constant. The only modification that is made to the above framework to obtain shMCGM is in Eq 4 where there are additional weight factors. We will first try to understand the effect of introducing shadowing in shMCGM on observables computed thereof qualitatively neglecting the NBD fluctuations of the sources before discussing the Monte-Carlo results. The contribution to energy deposition due to a participant nucleon i from the nucleus A at xiA, yAi , zAi in the twocomponent scheme occurs through the participant term
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