Does the A dependence in high-p_T jets come from the European muon collaboration effect?

Abstract

We show that the models for the European Muon Collaboration effect without a cumulative region (x>1) are not compatible with the "anomalous nuclear enhancement" of high-transverse-momentum jet cross sections. This assertion depends only on the single-hard-scattering picture without final-state interactions or multiscattering and is independent of the exact forms of the nuclear structure functions. We also show that it is possible to reproduce a part of the nuclear enhancement if one includes the cumulative effects.