12-18 August 2012
US/Eastern timezone

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Directed flow at midrapidity at the LHC

16 Aug 2012, 16:00
2h
Regency 1/3 and Ambassador ()

Regency 1/3 and Ambassador

Poster Correlations and fluctuations Poster Session Reception

Speaker

Ekaterina Retinskaya (IPhT Saclay)

Description

We present the first extraction of the recently-proposed rapidity-even directed flow observable v1, obtained from an analysis of published two-particle correlation data from the ALICE Collaboration. An accounting of the correlation due to the conservation of transverse momentum restores the factorization seen in all other Fourier harmonics and thus indicates that the remaining correlation gives a reliable measurement of directed flow. We also present results from the first viscous hydrodynamic calculation of directed flow, and show that it is less sensitive to viscosity than higher harmonics. This allows for a direct extraction of the dipole asymmetry of the initial state, providing a strict constraint on the non-equilibrium dynamics of the early-time system. (Reference: arXiv:1203.0931)

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