Abstract
We report on results obtained with the Event Shape Engineering technique applied to Pb-Pb collisions at $\sqrt{s_\rm{NN}}=2.76$ TeV. By selecting events in the same centrality interval, but with very different average flow, different initial state conditions can be studied. We find the effect of the event-shape selection on the elliptic flow coefficient $v_2$ to be almost independent of transverse momentum $p_\rm{T}$, as expected if this effect is due to fluctuations in the initial geometry of the system. Charged hadron, pion, kaon, and proton transverse momentum distributions are found to be harder in events with higher-than-average elliptic flow, indicating an interplay between radial and elliptic flow.
Highlights
Results from lattice quantum chromodynamics [1,2] predict the existence of a plasma of deconfined quarks and gluons, known as the “quark gluon plasma” (QGP)
The geometry of the initial state fluctuates event by event and measurements of the resulting vn fluctuations pose stringent constraints on initial-state models
In this paper we present the results on eatlli√ptsiNcNfl=ow2a.7n6d charged-particle spectra in Pb-Pb collisions TeV obtained with the ESE technique
Summary
Results from lattice quantum chromodynamics [1,2] predict the existence of a plasma of deconfined quarks and gluons, known as the “quark gluon plasma” (QGP). If the initial geometry of the interaction region is not azimuthally symmetric, a hydrodynamic evolution of a nearly ideal liquid (i.e., with a small value of the shear viscosity over entropy ratio η/s) gives rise to an azimuthally anisotropic distribution in momentum space for the produced particles. This anisotropy can be characterized in terms of the Fourier coefficients vn of the particle azimuthal distribution [7].
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