How resonance-continuum interference changes 750 GeV diphoton excess: Signal enhancement and peak shift

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

doi:10.1007/JHEP05(2016)009

Title: How resonance-continuum interference changes 750 GeV diphoton excess: Signal enhancement and peak shift

Journal Article · Mon May 02 00:00:00 EDT 2016 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP05(2016)009· OSTI ID:1253728

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

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

A hypothetical new scalar resonance, a candidate explanation for the recently observed 750 GeV diphoton excess at the LHC 13 TeV, necessarily interferes with the continuum background gg → γγ. The interference has two considerable effects: (1) enhancing or suppressing diphoton signal rate due to the imaginary-part interference and (2) distorting resonance shape due to the real-part interference. We study them based on the best-fit analysis of two benchmark models: two Higgs doublets with ~50 GeV width (exhibiting the imaginary-part interference effect) and a singlet scalar with 5 GeV width (exhibiting the real-part one), both extended with vector-like fermions. Furthermore, we find that the resonance contribution can be enhanced by a factor of 2 (1.6) for 3 (6) fb signal rate, or the 68% CL allowed mass region is shifted by O (1) GeV. If the best-fit excess rate decreases in the future data, the interference effects will become more significant.

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

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1253728

Journal Information:: Journal of High Energy Physics (Online), Vol. 2016, Issue 5; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 1 work

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