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

2015/03/26 by Stefan Liebler, Liebler, Stefan
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Neutrino Physics Research #Particle physics theoretical and experimental studies #hep-ph

paper · pdf · doi:10.48550/arxiv.1503.07830

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

arxiv created 2015/03/26 · openalex publication_date 2015/03/26 · arxiv updated 2015/03/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We discuss off-shell contributions in Higgs decays to heavy gauge bosons H→ VV^(*) with V∈\lbrace Z,W\rbrace for a standard model (SM) Higgs boson for both dominant production processes e⁺e^-→ ZH→ ZVV^(*) and e⁺e^-→ ννH→ ννVV^(*) 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→ γγ decays for the Higgsstrahlung initiated process e⁺e^-→ Zγγ, 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.

Citations

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Interference effects in Heavy Higgs production via gluon fusion in the Singlet Extension of the Standard Model

Related

• One-loop on-shell and off-shell decay H^*→ VV at future e^-e^- collider
• Higgs boson production and decay at e⁺e^- colliders as a probe of the Left-Right twin Higgs model
• Background processes in Higgs decay to Z gamma
• Higgs bosons production and decay at future e⁺e^- linear colliders as a probe of the B-L model
• Studying the Higgs Potential via e⁺e^- → Zhh