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Higgs Properties and Fourth Generation Leptons · Around

2011

Higgs Properties and Fourth Generation Leptons

Ishiwata, Koji, Wise, Mark B.

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It is possible that there are additional vector-like 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 vector-like 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 -> gamma gamma to about 30% of its standard-model value.
The dependence of this branching ratio on the new charged lepton masses is weak.

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