QCD Corrections to Diboson Production

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Abstract

The QCD radiative corrections to hadronic diboson production are reviewed. The radiative corrections for \(W^{\pm}\gamma\), \(Z\gamma\), \(ZZ\), \(W^+W^-\), and \(W^{\pm} Z\) are discussed. Similarities and differences in the behavior of the order \(\alpha_s\) cross sections for these processes are emphasized.

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QCD Corrections to Hadronic \(W\gamma\) Production with Non-standard \(WW\gamma\) Couplings

U Baur, Tao Han, J. Ohnemus (1993)

The process \(p \pbar \rightarrow W^{\pm}\gamma + X \rightarrow \ell^\pm \nu \gamma + X\) is calculated to \({\cal O}(\alpha_s)\) for general \(CP\) conserving \(WW\gamma\) couplings. At the Tevatron center of mass energy, the QCD corrections to \(W\gamma\) production are modest, and the Born and inclusive \({\cal O}(\alpha_s)\) cross sections have similar sensitivities to the effects of anomalous couplings. At supercollider energies, the inclusive QCD corrections are large at high photon transverse momenta, reducing the sensitivity to non-standard \(WW\gamma\) couplings by up to a factor~2. The size of the QCD corrections can be reduced significantly, and a large fraction of the sensitivity lost can be regained, if a jet veto is imposed.

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Amplitude Zeros in \(W^\pm Z\) Production

J. Ohnemus, Tao Han, U Baur (1994)

We demonstrate that the Standard Model amplitude for \(f_1 \bar f_2 \rightarrow W^\pm Z \) at the Born-level exhibits an approximate zero located at \(\cos\theta = (g^{f_1}_{-} + g^{f_2}_{-}) / (g^{f_1}_{-} - g^{f_2}_{-})\) at high energies, where the \(g^{f_i}_{-}\) (\(i=1,2\)) are the left-handed couplings of the \(Z\)-boson to fermions and \(\theta\) is the center of mass scattering angle of the \(W\)-boson. The approximate zero is the combined result of an exact zero in the dominant helicity amplitudes \({\cal M}(\pm,\mp)\) and strong gauge cancelations in the remaining amplitudes. For non-standard \(WWZ\) couplings these cancelations no longer occur and the approximate amplitude zero is eliminated.