Interference effect on a heavy Higgs resonance signal in the γγ and ZZ channels

Song, Jeonghyeon; Yoon, Yeo Woong; Jung, Sunghoon

doi:10.1103/PhysRevD.93.055035

Title: Interference effect on a heavy Higgs resonance signal in the $γ γ$ and $Z Z$ channels

Journal Article · Thu Mar 24 00:00:00 EDT 2016 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.93.055035· OSTI ID:1261083

Song, Jeonghyeon ^[1]; Yoon, Yeo Woong ^[2]; Jung, Sunghoon ^[3]

KonKuk Univ., Seoul (Korea)
KonKuk Univ., Seoul (Korea); Korea Institute for Advanced Study, Seoul (Korea)
Korea Institute for Advanced Study, Seoul (Korea); SLAC National Accelerator Lab., Menlo Park, CA (United States)

The resonance-continuum interference is usually neglected when the width of a resonance is small compared to the resonance mass. We reexamine this standard by studying the interference effects in high-resolution decay channels, γγ and ZZ, of the heavy Higgs boson H in nearly aligned two-Higgs-doublet models. For the H with a sub-percent width-to-mass ratio, we find that, in the parameter space where the LHC 14 TeV ZZ resonance search can be sensitive, the interference effects can modify the ZZ signal rate by O(10)% and the exclusion reach by O(10) GeV. In other parameter space where the ZZ or γγ signal rate is smaller, the LHC 14 TeV reach is absent, but a resonance shape can be much more dramatically changed. In particular, the γγ signal rate can change by O(100)%. Relevant to such parameter space, we suggest variables that can characterize a general resonance shape. Furthermore, we also illustrate the relevance of the width on the interference by adding nonstandard decay modes of the heavy Higgs boson.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-76SF00515; 2013R1A1A2061331; 2012R1A2A1A01006053

OSTI ID:: 1261083

Alternate ID(s):: OSTI ID: 1243161

Report Number(s):: SLAC-PUB-16434; PRVDAQ; arXiv:1510.03450

Journal Information:: Physical Review D, Vol. 93, Issue 5; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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Title: Interference effect on a heavy Higgs resonance signal in the $γ γ$ and $Z Z$ channels