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

Abstract

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.

Authors:
 [1];  [2];  [3];  [4]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Univ. of California, Santa Barbara, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Univ. of California, Santa Barbara, CA (United States); Peking Univ., Beijing (China)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of California, Santa Barbara, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
OSTI Identifier:
1393960
Alternate Identifier(s):
OSTI ID: 1180177; OSTI ID: 1602028
Grant/Contract Number:  
AC02-06CH11357; FG02-91ER40618; SC0011702; AC02-05CH11231
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 90; Journal Issue: 7; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Higgs boson; Higgs-flavon mixing; LHC phenomenology; broken flavor symmetry; flavon

Citation Formats

Berger, Edmond L., Giddings, Steven B., Wang, Haichen, and Zhang, Hao. Higgs-flavon mixing and LHC phenomenology in a simplified model of broken flavor symmetry. United States: N. p., 2014. Web. doi:10.1103/PhysRevD.90.076004.
Berger, Edmond L., Giddings, Steven B., Wang, Haichen, & Zhang, Hao. Higgs-flavon mixing and LHC phenomenology in a simplified model of broken flavor symmetry. United States. https://doi.org/10.1103/PhysRevD.90.076004
Berger, Edmond L., Giddings, Steven B., Wang, Haichen, and Zhang, Hao. 2014. "Higgs-flavon mixing and LHC phenomenology in a simplified model of broken flavor symmetry". United States. https://doi.org/10.1103/PhysRevD.90.076004. https://www.osti.gov/servlets/purl/1393960.
@article{osti_1393960,
title = {Higgs-flavon mixing and LHC phenomenology in a simplified model of broken flavor symmetry},
author = {Berger, Edmond L. and Giddings, Steven B. and Wang, Haichen and Zhang, Hao},
abstractNote = {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.},
doi = {10.1103/PhysRevD.90.076004},
url = {https://www.osti.gov/biblio/1393960}, journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
issn = {1550-7998},
number = 7,
volume = 90,
place = {United States},
year = {2014},
month = {10}
}

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Cited by: 7 works
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Works referencing / citing this record:

Hunting the flavon
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Searching for lepton flavor violating flavon decays at hadron colliders
journal, July 2018


New Physics in Resonant Production of Higgs Boson Pairs
journal, January 2015