Wounded quark sources with shadowing in a Glauber Monte Carlo model reproduce the centrality dependence of multiplicity fluctuations measured by NA49 in Pb+Pb collisions for 80 to 200 projectile participants.
Initial conditions from the shadowed Glauber model
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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.
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Multiplicity fluctuations in the Glauber Monte Carlo approach
Wounded quark sources with shadowing in a Glauber Monte Carlo model reproduce the centrality dependence of multiplicity fluctuations measured by NA49 in Pb+Pb collisions for 80 to 200 projectile participants.