Azimuthally sensitive HBT in Au + Au collisions at s(NN)**(1/2) = 200-GeV

The STAR collaboration
Phys.Rev.Lett. 93 (2004) 012301, 2004.

Abstract (data abstract)
We present the results of a systematic study of the shape of the pion distribution in coordinate space at freeze-out in Au+Au collisions at BNL RHIC using two-pion Hanbury Brown–Twiss (HBT) interferometry. Oscillations of the extracted HBT radii versus emission angle indicate sources elongated perpendicular to the reaction plane. The results indicate that the pressure and expansion time of the collision system are not sufficient to completely quench its initial shape.

  • Figure 1


    Squared HBT radii relative to the reaction plane angle for three centrality classes.

  • Figure 2


    Squared HBT radii relative to the reaction plane angle for four kT (GeV/c) bins, 20-30% centrality events.

  • Figure 3


    Fourier coefficients of azimuthal oscillations of HBT radii vs number of participating nucleons, for three kT (GeV/c) bins. Larger participant...

  • Figure 4


    Source eccentricity obtained with azimuthally sensitive HBT (epsilon_final) vs initial eccentricity from a Glauber model (epsilon_initial). The most peripheral collisions...

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