Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2000-03-10
Phys.Lett.B489:287-292,2000
Physics
Nuclear Physics
Nuclear Theory
submitted to Phys. Rev. Lett; revised version has some wording changes/clarification, finer binning in q leads to tiny changes
Scientific paper
10.1016/S0370-2693(00)00952-7
Intensity interferometry in noncentral heavy ion collisions provides access to novel information on the geometry of the effective pion-emitting source. We demonstrate analytically that, even for vanishing pair momentum, the cross terms $R_{ol}^2$ and $R_{sl}^2$ of the HBT correlation function in general show a strong first harmonic in their azimuthal dependence. The strength of this oscillation characterizes the tilt of the major axis of the spatial emission ellipsoid away from the direction of the beam. Event generator studies indicate that this tilt can be large (>20 degrees) at AGS energies which makes it by far the most significant azimuthally sensitive HBT signal at these energies. Moreover, transport models suggest that for pions this spatial tilt is directed opposite to the tilt of the directed flow ellipsoid in momentum space. A measurement of the azimuthal dependence of the HBT cross terms $R_{ol}^2$ and $R_{sl}^2$ thus probes directly the physical origin of directed pion flow.
Heinz Ulrich
Lisa Michael Annan
Wiedemann Urs Achim
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