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Anomalous Higgs Yukawa Couplings
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Anomalous Higgs Yukawa Couplings
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In the standard model, the Higgs boson $h$ couples to the quarks and charged leptons according to the well-known formula $(m_\psi/v) h \bar{\psi}\psi$, where $\psi$ = quark (q) or lepton (l) and $v$ = 246 GeV is its vacuum expectation value. Suppose $m_\psi$ is of radiative origin instead, then the effective $h \bar{\psi}\psi$ Yukawa coupling will not be exactly $m_\psi/v$. We show for the first time quantitatively how this may shift the observed branching fraction of $h \to \bar{b}b$ and $h \to \tau^+ \tau^-$ upward or downward. Thus the precision measurements of Higgs decay to fermions at the Large Hadron Collider, due to resume operation in 2015, could be the key to possible new physics.
Forward citations
Cited by 2 Pith papers
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Classification of minimal models producing b, c and tau masses at one-loop level
A systematic catalogue of 25 minimal radiative mass models for b, c, and τ, including eight 'hybrid' models whose Yukawa couplings can lie above, below, or exactly at the Standard Model prediction.
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Higgs Yukawa coupling constraints on a benchmark one-loop radiative mass model for the bottom, charm and tau
A radiative one-loop mass model for b, c, τ, and ντ remains consistent with current Higgs and EW data, and future Yukawa-precision measurements are projected to tighten, but not close, its viable parameter space.
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