Azimuthal asymmetry at large p_t seem to be too large for a pure "jet quenching"

We discuss a simple generic model of "jet quenching" in which matter absorption is defined by one parameter. We show that as absorption grows, the azimuthal asymmetry parameter ν₂ grows as well, reaching the finite limit ν*₂ which has a simple geometric interpretation. We show that this limit is still below the experimental values for 6>p_t>2 GeV, according to preliminary data from the STAR experiment at RHIC. We thus conclude that jet quenching models alone cannot account for the observed phenomenon, and speculate about alternative scenarios.