<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>Z</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>γ</mml:mi></mml:mrow><mml:mrow><mml:mo>*</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>production at hadron colliders

TL;DRAbstract

We calculate the production of a ${Z}^{0}{\ensuremath{\gamma}}^{*}$ pair at hadron colliders from gluon-gluon fusion and quark-antiquark annihilation. We show that the gluon-gluon contribution is always much smaller than the one from quark-antiquark annihilation and compare both to the cross section for production of an intermediate Higgs boson decaying into a pair of ${Z}^{0}'\mathrm{s}$, one of them being produced off the mass shell.

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