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Higgs Boson Production in Association with a Photon in Vector Boson Fusion at the LHC

Emidio Gabrielli·Fabio Maltoni·Barbara Mele·Mauro Moretti·Fulvio Piccinini·Roberto Pittau
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Abstract

Higgs boson production in association with two forward jets and a central photon at the CERN Large Hadron Collider is analyzed, for the Higgs boson decaying into a b bbar pair in the m_H <= 140 GeV mass region. We study both irreducible and main reducible backgrounds at parton level. Compared to the Higgs production via vector-boson fusion, the request of a further photon at moderate rapidities dramatically enhances the signal/background ratio. Inclusive cross sections for p_T^γ>= 20 GeV can reach a few tens of fb's. After a suitable choice of kinematical cuts, the cross-section ratio for signal and irreducible-background can be enhanced up to >= ~1/10, with a signal cross section of the order of a few fb's, for m_H ~ 120 GeV. The request of a central photon radiation also enhances the relative signal sensitivity to the WWH coupling with respect to the ZZH coupling. Hence, a determination of the cross section for the associated production of a Higgs boson decaying into a b bbar pair plus a central photon in vector-boson fusion could help in constraining the b bbar H coupling, and the WWH coupling as well. A preliminary study of QCD showering effects points to a further significant improvement of the signal detectability over the background.

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Emidio Gabrielli, Fabio Maltoni, Barbara Mele, Mauro Moretti, Fulvio Piccinini, Roberto Pittau. 2007-08-29. Higgs Boson Production in Association with a Photon in Vector Boson Fusion at the LHC. https://doi.org/10.1016/j.nuclphysb.2007.05.010

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