Non-resonant diagrams in radiative four-fermion processes

Details Non-resonant diagrams in radiative four-fermion processes Non-resonant diagrams in radiative four-fermion processes

1994-07-15

arxiv.org/abs/hep-ph/9407308v3

Nucl.Phys.Proc.Suppl. 37B (1994) 169

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, latex, KEK-CP-015, KEK Preprint 94-46, LAPP-Exp.-94.09

Scientific paper

10.1016/0920-5632(94)90673-4

The complete tree level cross section for $e^+e^- \to e^- \bar\nu_e u \bar{d} \gamma$ is computed and discussed in comparison with the cross sections for $e^+e^- \to e^- \bar\nu_e u \bar{d} $ and $e^+e^- \to \bar{u} d u \bar{d}$. Event generators based on the GRACE package for the non-radiative and radiative case are presented. Special interest is brought to the effect of the non-resonant diagrams overlooked so far in other studies. Their contribution to the total cross section is presented for the LEP II energy range and for future linear colliders ($\sqrt s$ =500 GeV). Effects, at the W pair threshold, of order 3\% ($e^- \bar\nu_e u \bar{d}$) and 27\% ($\bar{u} d u \bar{d}$) are reported. Similar behaviour for the radiative case is shown. At $\sqrt s$ = 500 GeV, the relative contribution of the non-resonant diagrams for the radiative channel reaches 42.5\%.

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