Moretti, S. (2015) Variations on a Higgs theme. Physical Review D, 91, [014012]. (doi:10.1103/PhysRevD.91.014012).
Abstract
We show how the Z boson can be generated in gluon-gluon fusion and yield two photons, via gg→Z→γγ, through massive fermion loops only, thereby contributing events to a candidate Higgs sample in the diphoton channel. A subleading contribution also exists from q
¯
q→Z→γγ events. Assuming the Standard Model, the corresponding event rates are negligible at the Large Hadron Collider stages of 7 and 8 TeV, given the luminosities collected therein (about 5 and 20 fb−1, respectively). Conversely, at 14 TeV, the first process becomes accessible for luminosities of order 300 fb−1. Finally, we show how additional fermion states entering such loops, in production, in decay or in both cases, could affect the predictions in this channel by curiously mimicking Higgs signals.
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