Higgs-flavon mixing and LHC phenomenology in a simplified model of broken flavor symmetry

Berger, Edmond L.; Giddings, Steven B.; Wang, Haichen; Zhang, Hao

doi:10.1103/PhysRevD.90.076004

Title: Higgs-flavon mixing and LHC phenomenology in a simplified model of broken flavor symmetry

Journal Article · Fri Oct 10 00:00:00 EDT 2014 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.90.076004· OSTI ID:1393960

Berger, Edmond L. ^[1]; Giddings, Steven B. ^[2]; Wang, Haichen ^[3]; Zhang, Hao ^[4]

Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of California, Santa Barbara, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Santa Barbara, CA (United States); Peking Univ., Beijing (China)

Here, the LHC phenomenology of a low-scale gauged flavor symmetry model with inverted hierarchy is studied, through introduction of a simplified model of broken flavor symmetry. A new scalar (a flavon) and a new neutral top-philic massive gauge boson emerge with mass in the TeV range, along with a new heavy fermion associated with the standard model top quark. After checking constraints from electroweak precision observables, we investigate the influence of the model on Higgs boson physics, notably on its production cross section and decay branching fractions. Limits on the flavon φ from heavy Higgs boson searches at the LHC at 7 and 8 TeV are presented. The branching fractions of the flavon are computed as a function of the flavon mass and the Higgs-flavon mixing angle. We also explore possible discovery of the flavon at 14 TeV, particularly via the φ → Z⁰Z⁰ decay channel in the 2ℓ2ℓ' final state, and through standard model Higgs boson pair production φ → hh in the b¯bγγ final state. We conclude that the flavon mass range up to 500 GeV could be probed down to quite small values of the Higgs-flavon mixing angle with 100 fb^–1 of integrated luminosity at 14 TeV.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of California, Santa Barbara, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)

Grant/Contract Number:: AC02-06CH11357; FG02-91ER40618; SC0011702; AC02-05CH11231

OSTI ID:: 1393960

Alternate ID(s):: OSTI ID: 1180177; OSTI ID: 1602028

Journal Information:: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 90, Issue 7; ISSN 1550-7998

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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