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Title: Hiding a Heavy Higgs Boson at the 7 TeV LHC

Abstract

A heavy Standard Model Higgs boson is not only disfavored by electroweak precision observables but is also excluded by direct searches at the 7 TeV LHC for a wide range of masses. Here, we examine scenarios where a heavy Higgs boson can be made consistent with both the indirect constraints and the direct null searches by adding only one new particle beyond the Standard Model. This new particle should be a weak multiplet in order to have additional contributions to the oblique parameters. If it is a color singlet, we find that a heavy Higgs with an intermediate mass of 200-300 GeV can decay into the new states, suppressing the branching ratios for the standard model modes, and thus hiding a heavy Higgs at the LHC. If the new particle is also charged under QCD, the Higgs production cross section from gluon fusion can be reduced significantly due to the new colored particle one-loop contribution. Current collider constraints on the new particles allow for viable parameter space to exist in order to hide a heavy Higgs boson. We categorize the general signatures of these new particles, identify favored regions of their parameter space and point out that discovering or excludingmore » them at the LHC can provide important indirect information for a heavy Higgs. Finally, for a very heavy Higgs boson, beyond the search limit at the 7 TeV LHC, we discuss three additional scenarios where models would be consistent with electroweak precision tests: including an additional vector-like fermion mixing with the top quark, adding another U(1) gauge boson and modifying triple-gauge boson couplings.« less

Authors:
; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1036967
Report Number(s):
SLAC-PUB-14810
Journal ID: ISSN 1029--8479; arXiv:1112.1964; TRN: US1201506
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article
Journal Name:
Submitted to Journal of High Energy Physics (JHEP)
Additional Journal Information:
Journal Volume: 2012; Journal Issue: 8; Journal ID: ISSN 1029--8479
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACCURACY; BOSONS; BRANCHING RATIO; COLOR; CROSS SECTIONS; DECAY; FERMIONS; GLUONS; HIGGS BOSONS; MULTIPLETS; PRODUCTION; QUANTUM CHROMODYNAMICS; STANDARD MODEL; T QUARKS; Experiment-HEP, Phenomenology-HEP,HEPPH, HEPEX

Citation Formats

Bai, Yang, Fan, JiJi, and Hewett, JoAnne L. Hiding a Heavy Higgs Boson at the 7 TeV LHC. United States: N. p., 2012. Web. doi:10.1007/JHEP08(2012)014.
Bai, Yang, Fan, JiJi, & Hewett, JoAnne L. Hiding a Heavy Higgs Boson at the 7 TeV LHC. United States. doi:10.1007/JHEP08(2012)014.
Bai, Yang, Fan, JiJi, and Hewett, JoAnne L. Tue . "Hiding a Heavy Higgs Boson at the 7 TeV LHC". United States. doi:10.1007/JHEP08(2012)014. https://www.osti.gov/servlets/purl/1036967.
@article{osti_1036967,
title = {Hiding a Heavy Higgs Boson at the 7 TeV LHC},
author = {Bai, Yang and Fan, JiJi and Hewett, JoAnne L.},
abstractNote = {A heavy Standard Model Higgs boson is not only disfavored by electroweak precision observables but is also excluded by direct searches at the 7 TeV LHC for a wide range of masses. Here, we examine scenarios where a heavy Higgs boson can be made consistent with both the indirect constraints and the direct null searches by adding only one new particle beyond the Standard Model. This new particle should be a weak multiplet in order to have additional contributions to the oblique parameters. If it is a color singlet, we find that a heavy Higgs with an intermediate mass of 200-300 GeV can decay into the new states, suppressing the branching ratios for the standard model modes, and thus hiding a heavy Higgs at the LHC. If the new particle is also charged under QCD, the Higgs production cross section from gluon fusion can be reduced significantly due to the new colored particle one-loop contribution. Current collider constraints on the new particles allow for viable parameter space to exist in order to hide a heavy Higgs boson. We categorize the general signatures of these new particles, identify favored regions of their parameter space and point out that discovering or excluding them at the LHC can provide important indirect information for a heavy Higgs. Finally, for a very heavy Higgs boson, beyond the search limit at the 7 TeV LHC, we discuss three additional scenarios where models would be consistent with electroweak precision tests: including an additional vector-like fermion mixing with the top quark, adding another U(1) gauge boson and modifying triple-gauge boson couplings.},
doi = {10.1007/JHEP08(2012)014},
journal = {Submitted to Journal of High Energy Physics (JHEP)},
issn = {1029--8479},
number = 8,
volume = 2012,
place = {United States},
year = {2012},
month = {3}
}