Enhancement of H →yy from doubly charged scalars in the Higgs triplet nodel
Enhancement of H →yy from doubly charged scalars in the Higgs triplet nodel
The Higgs boson of the Standard Model is being searched for at the LHC in the channel H →yy gamma gamma. In the Higgs Triplet Model (HTM) there are contributions to this decay from loops of doubly charged scalars (H±±) and singly charged scalars (H±) that are not present in the Standard Model. These additional contributions are mediated by the trilinear couplings H1H++H-and H1H+H-, where H1 is the lightest CP-even Higgs boson. We point out the possibility of constructive interference of the H±± contribution with that of the W± contribution, which enables a substantial enhancement of the branching ratio of H1 →yy gamma gamma in the HTM. The magnitude of the contribution of H±± is essentially determined by the mass of H±±(mH++) and a quartic scalar coupling (λ1), with constructive interference arising for λ1 < 0. Consequently, the ongoing searches for H→yy gamma gamma restrict the parameter space of [mH++λ1] more stringently for λ1 < 0 than for the recently-studied case of destructive interference with λ1 > 0. Moreover, if the excess of yy events around a mass of 125 GeV in the LHC searches for H→yy gamma gamma is substantiated with larger data samples, and the branching ratio is measured to be somewhat larger than that for the SM Higgs boson, then such an enhancement could be readily accommodated by H1 in the HTM with λ1 < 0.
hep-ph
Akeroyd, A. G.
e5de827d-7119-41c2-9f1e-5ef123afdf98
Moretti, S.
b57cf0f0-4bc3-4e02-96e3-071255366614
24 August 2012
Akeroyd, A. G.
e5de827d-7119-41c2-9f1e-5ef123afdf98
Moretti, S.
b57cf0f0-4bc3-4e02-96e3-071255366614
Akeroyd, A. G. and Moretti, S.
(2012)
Enhancement of H →yy from doubly charged scalars in the Higgs triplet nodel.
Physical Review D, 86 (3), [035015].
(doi:10.1103/PhysRevD.86.035015).
Abstract
The Higgs boson of the Standard Model is being searched for at the LHC in the channel H →yy gamma gamma. In the Higgs Triplet Model (HTM) there are contributions to this decay from loops of doubly charged scalars (H±±) and singly charged scalars (H±) that are not present in the Standard Model. These additional contributions are mediated by the trilinear couplings H1H++H-and H1H+H-, where H1 is the lightest CP-even Higgs boson. We point out the possibility of constructive interference of the H±± contribution with that of the W± contribution, which enables a substantial enhancement of the branching ratio of H1 →yy gamma gamma in the HTM. The magnitude of the contribution of H±± is essentially determined by the mass of H±±(mH++) and a quartic scalar coupling (λ1), with constructive interference arising for λ1 < 0. Consequently, the ongoing searches for H→yy gamma gamma restrict the parameter space of [mH++λ1] more stringently for λ1 < 0 than for the recently-studied case of destructive interference with λ1 > 0. Moreover, if the excess of yy events around a mass of 125 GeV in the LHC searches for H→yy gamma gamma is substantiated with larger data samples, and the branching ratio is measured to be somewhat larger than that for the SM Higgs boson, then such an enhancement could be readily accommodated by H1 in the HTM with λ1 < 0.
Text
1206.0535v1
- Accepted Manuscript
More information
Accepted/In Press date: 4 June 2012
Published date: 24 August 2012
Additional Information:
16 pages, 4 figures
Keywords:
hep-ph
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Theory Group
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Local EPrints ID: 356684
URI: http://eprints.soton.ac.uk/id/eprint/356684
ISSN: 1550-7998
PURE UUID: 2a95f579-3a0d-4c6e-a118-7a14f514fbaf
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Date deposited: 16 Sep 2013 10:26
Last modified: 12 Apr 2025 01:45
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