Production of heavy quarks close to threshold

Abstract
We calculate production by vector and axial vector currents of heavy quark pairs (cc¯,bb¯,tt¯) close to threshold. We take into account strong interaction contributions (including radiative corrections and leading nonperturbative effects) by using the Fermi-Watson final-state interaction theorem. We use the results obtained to compare with experiment for open production of cc¯,bb¯ near threshold, and to give a reliable estimate of the so-called ‘‘threshold effects’’ contribution to vector and axial vector correlators, for tt¯, i.e., the contribution of regions close to 4mt2 to Π(t), for small values of t (0t≲MZ2).
All Related Versions