# Nuclear Physics Colloquium

Location:  Physics Building Science Campus Riedberg, Max-von-Laue-Str. 1, room PHYS  __.102
Time: Tuesday, June 11, 2013,  1:00-2:00pm
(plus 10min for discussion)
Contact:

# Initial state from the NLO pQCD + local saturation model

## Harri Niemi (University of Jyväskylä)

The essential input to the fluid dynamical evolution in heavy-ion
collisions  is the energy density profile in the transverse
plane. For example the
spatial eccentricity of the profile determines the strenght of the pressure gradients that eventually leads to the azimuthal asymmetry of the momentum spectra of
hadrons, i.e. non-zero $v_n$'s. Similarly, the centrality dependence of the multiplicity is mainly determined by the initial conditions.

Our calculation of the initial state is based on the next-to-leading order pQCD calculation of transverse energy, supplemented by a transversally local saturation
condition. Uncertainties of the model are addressed, and we compare the initial state model with data form the LHC using a full fluid dynamical evolution.

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