Title: Higgs–photon resonances

Abstract

We study models that produce a Higgs boson plus photon ($$h^0 \gamma$$) resonance at the LHC. When the resonance is a $Z'$ boson, decays to $$h^0 \gamma$$ occur at one loop. If the $Z'$ boson couples at tree-level to quarks, then the $$h^0 \gamma$$ branching fraction is typically of order $$10^{-5}$$ or smaller. Nevertheless, there are models that would allow the observation of $$Z' \to h^0 \gamma$$ at $$\sqrt{s} = 13$$ TeV with a cross section times branching fraction larger than 1 fb for a $Z'$ mass in the 200--450 GeV range, and larger than 0.1 fb for a mass up to 800 GeV. The 1-loop decay of the $Z'$ into lepton pairs competes with $$h^0 \gamma$$, even if the $Z'$ couplings to leptons vanish at tree level. We also present a model in which a $Z'$ boson decays into a Higgs boson and a pair of collimated photons, mimicking an $$h^0 \gamma$$ resonance. In this model, the $$h^0 \gamma$$ resonance search would be the discovery mode for a $Z'$ as heavy as 2 TeV. When the resonance is a scalar, although decay to $$h^0 \gamma$$ is forbidden by angular momentum conservation, the $h^0$ plus collimated photons channel is allowed. Here, we comment on prospects of observing an $$h^0 \gamma$$ resonance through different Higgs decays, on constraints from related searches, and on models where $h^0$ is replaced by a nonstandard Higgs boson.

Authors:

Dobrescu, Bogdan A.; Fox, Patrick J.; Kearney, John

Publication Date:

Tue Oct 24 00:00:00 EDT 2017

Research Org.:

Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Org.:

USDOE Office of Science (SC), High Energy Physics (HEP)

OSTI Identifier:

1402542

Alternate Identifier(s):

OSTI ID: 1367902

Report Number(s):

FERMILAB-PUB-17-169-T; arXiv:1705.08433
Journal ID: ISSN 1434-6044; 704; PII: 5276

Grant/Contract Number:  

SC0007859; AC02-07CH11359

Resource Type:

Published Article

Journal Name:

European Physical Journal. C, Particles and Fields

Additional Journal Information:

Journal Name: European Physical Journal. C, Particles and Fields Journal Volume: 77 Journal Issue: 10; Journal ID: ISSN 1434-6044

Publisher:

Springer Science + Business Media

Country of Publication:

Germany

Language:

English

Subject:

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS