QCD Corrections to $γγ\to ZZ$ at Small Scattering Angles

Details QCD Corrections to $γγ\to ZZ$ at Small Scattering Angles QCD Corrections to $γγ\to ZZ$ at Small Scattering Angles

2003-09-04

arxiv.org/abs/hep-ph/0309043v1

Phys.Lett. B580 (2004) 169-176

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 Pages, 4 Figures

Scientific paper

10.1016/j.physletb.2003.11.045

QCD corrections to the electroweak cross section of $\gamma\gamma\to ZZ$ at high energies and small scattering angles have been calculated. The dominant contributions are due to $t$-channel gluon exchange, i.e. photons dissociate into quark-antiquark pairs giving rise to two colour dipoles which interact through gluons. Corrections resulting from the leading log BFKL amplitude are of the order of a few percent close to the forward region already at the 1 TeV energy range and are rising with the scattering energy. We also considered the helicity non-conserving cases in which the QCD corrections in comparison to the electroweak part of the amplitude strongly grow with energy. The helicity non-conserving scattering process is of particular interest since it is sensitive to the Higgs sector.

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