Directed Flow of Charged Particles at Midrapidity Relative to the Spectator Plane in Pb-Pb Collisions at root s(NN)=2.76TeV
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Abstract
The directed flow of charged particles at midrapidity is measured in
Pb-Pb collisions at root s(NN) p 2: 76 TeV relative to the collision
symmetry plane defined by the spectator nucleons. A negative slope of
the rapidity-odd directed flow component with approximately 3 times
smaller magnitude than found at the highest RHIC energy is observed.
This suggests a smaller longitudinal tilt of the initial system and
disfavors the strong fireball rotation predicted for the LHC energies.
The rapidity-eveen directed flow component is measured for the first time
with spectators and found to be independent of pseudorapidity with a
sign change at transverse momenta p(T) between 1.2 and 1: 7 GeV/c.
Combined with the observation of a vanishing rapidity-even p(T) shift
along the spectator deflection this is strong evidence for dipolelike
initial density fluctuations in the overlap zone of the nuclei. Similar
trends in the rapidity-even directed flow and the estimate from
two-particle correlations at midrapidity, which is larger by about a
factor of 40, indicate a weak correlation between fluctuating
participant and spectator symmetry planes. These observations open new
possibilities for investigation of the initial conditions in heavy-ion
collisions with spectator nucleons.... Show more Show less