Oo Shell W Pair Production in E + E ? Annihilation: the Cc11 Process

The various four-fermion production channels in e + e ? annihilation are discussed and the CC11 process e + e ? ! f u 1 f d 1 f u 2 f d 2 , f6 =e, is studied in detail. The cross section d 2 =ds 1 ds 2 , with s 1 ; s 2 being the invariant masses squared of the two fermion pairs, may be expressed by six generic functions. All but one may be found in the literature. The cross section, including initial state radiation and the Coulomb correction, is discussed and compared with other calculations from low energies up to p s = 2 TeV. Figure 1: The double resonating CC3 contributions to oo shell W pair production: crayfish and crab. They are part of all the processes of table 1.