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2016

Asking for an extra photon in Higgs production at the LHC and beyond

Gabrielli, Emidio, Mele, Barbara, Piccinini, Fulvio et al.

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We study the inclusive production of a Higgs boson in association with a high-$p_T$ photon at the LHC, detailing the leading-order features of the main processes contributing to the $H\gamma$ final state.

Requiring an extra hard photon in Higgs production upsets the cross-section hierarchy for the dominant channels.
The $H\gamma$ inclusive production comes mainly from photons radiated in vector-boson fusion (VBF), which accounts for about 2/3 of the total rate, for $p_T^{\gamma,j} >30$ GeV, at leading order.
On the other hand, radiating a high-$p_T$ photon in the main top-loop Higgs channel implies an extra parton in the final state, which suppresses the production rate by a further $\alpha_S$ power.

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