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Higgs properties and fourth generation leptons

Ishiwata, Koji and Wise, Mark B. (2011) Higgs properties and fourth generation leptons. Physical Review D, 84 (5). 055025. ISSN 2470-0010. doi:10.1103/PhysRevD.84.055025.

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It is possible that there are additional vectorlike generations where the quarks have mass terms that do not originate from weak symmetry breaking, but the leptons only get mass through weak symmetry breaking. We discuss the impact that the new leptons have on Higgs boson decay branching ratios and on the range of allowed Higgs masses in such a model (with a single new vectorlike generation). We find that if the fourth generation leptons are too heavy to be produced in Higgs decay, then the new leptons reduce the branching ratio for h→γγ to about 30% of its standard-model value. The dependence of this branching ratio on the new charged lepton masses is weak. Furthermore the expected Higgs production rate at the LHC is very near its standard-model value if the new quarks are much heavier than the weak scale. If the new quarks have masses near the cutoff for the theory, then for cutoffs greater than 10^(15) GeV, the new lepton masses cannot be much heavier than about 100 GeV and the Higgs mass must have a value around 175 GeV.

Item Type:Article
Related URLs:
URLURL TypeDescription 10.1103/PhysRevD.84.055025DOIUNSPECIFIED
Additional Information:© 2011 American Physical Society. Received 18 July 2011; published 27 September 2011. The work was supported in part by the U.S. Department of Energy under Contract No. DE-FG02-92ER40701, and by the Gordon and Betty Moore Foundation.
Group:Caltech Theory, Moore Center for Theoretical Cosmology and Physics
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-92ER40701
Gordon and Betty Moore FoundationUNSPECIFIED
Issue or Number:5
Classification Code:PACS: 12.60.-i, 14.60.Hi, 14.65.Jk
Record Number:CaltechAUTHORS:20111021-142612846
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27358
Deposited On:21 Oct 2011 22:28
Last Modified:09 Nov 2021 16:48

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