Off-shell effects in Higgs decays to heavy gauge bosons and signal-background interference in Higgs decays to photons at a linear collider

Abstract

We discuss off-shell contributions in Higgs decays to heavy gauge bosons $H\to V{V}^{(\ast )}$ with $V\in \{Z,W\}$ for a standard model (SM) Higgs boson for both dominant production processes $e^{+}{e}^{-}\to ZH\to ZV{V}^{(\ast )}$ and $e^{+}{e}^{-}\to \nu \bar{\nu }H\to \nu \bar{\nu }V{V}^{(\ast )}$ at a (linear) $e^{+}{e}^{-}$ collider. Dependent on the centre-of-mass energy off-shell effects are sizable and important for the understanding of the electroweak symmetry breaking mechanism. Moreover we shortly investigate the effects of the signal-background interference in $H\to \gamma \gamma$ decays for the Higgsstrahlung initiated process $e^{+}{e}^{-}\to Z\gamma \gamma$, where we report a similar shift in the invariant mass peak of the two photons as found for the LHC. For both effects we discuss the sensitivity to the total Higgs width.

arXiv comment11 pages, 9 figures, talk presented at the International Workshop on Future Linear Colliders (LCWS14), Belgrade, Serbia, 6-10 October 2014

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• Combining LEP and LHC to bound the Higgs Width