On the feasibility of no-tag two-photon experiments on the Z pole

Abstract

The feasibility of studying the hadronic structure of the photon in the process γγ→high-p_Tjets+X at e⁺e^- colliders with √s≅M_z using no-tag experiments is studied. It is shown that at least on the parton level the background from annihilation multijet events with one or more jets in the forward/backward direction can be removed by cutting on the angle and p_T balance of the high-p_T jets, at least in the region of small invariant mass of the high-p_T jets, M_jj≤20-25 GeV, where the signal is sizeable. Hadronization effects are expected to be small if one restricts oneself to the region M_jj≥10GeV.