Initial state radiation effects on W and jet production.

A model for initial state parton showers, previously presented briefly, is here discussed in more detail. Experimentally, the transverse momentum spectrum of W and Z, and the associated jet activity, are the most obvious signals for initial state radiation. We show that these effects are well described by our model, compare with analytic calculations, and discuss the uncertainty due to various open issues in the description of initial state radiation. Other subjects studied include radiation effects on jet cross sections and the transverse energy flow. Results are presented for a wide range of CM energies. [ABSTRACT FROM AUTHOR]