2015/12/31 by Sunghoon Jung, Jeonghyeon Song, Yeo Woong Yoon · 1 citation
Physics and Astronomy · #Computer science #Fermion #Higgs boson #High-Energy Particle Collisions Research #Interference (communication) #Large Hadron Collider #Nuclear physics #Particle Detector Development and Performance #Particle physics #Particle physics theoretical and experimental studies #Physics #Resonance (particle physics) #Scalar (mathematics) #Telecommunications #hep-ex #hep-ph
paper · pdf · doi:10.1007/jhep05(2016)009
23 pages, 14 figures
arxiv created 2015/12/31 · openalex publication_date 2016/05/01 · arxiv updated 2016/05/25 · openalex created_date 2020/11/23 · openalex updated_date 2026/08/05
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. 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.