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The new scalar resonance contribution to the 750 GeV diphoton excess observedat the LHC 13 TeV necessarily interferes with the continuum background in the$gg\to \gamma \gamma$. The interference has two considerable effects: (1)enhancing or suppressing diphoton signal rate due to the imaginary-partinterference and (2) distorting resonance shape due to the real-partinterference. From the best-fit study of two benchmark models (two Higgsdoublets with $\sim$50 GeV widths and a singlet scalar with 5 GeV width, bothextended with vector-like fermions), we find that the resonance contribution tothe 750 GeV excess can be enhanced by a factor of 2(1.6) for 3(6) fb signalrate and the 68%(95%) CL best-fit mass range can shift by 1-4 (any ${\calO}$(1)) GeV. If the best-fit excess rate decreases with future data, theinterference effects will become more significant. The inevitable interferencescan also provide a consistency check of a resonance hypothesis, whether or notfuture precision shape measurements confirm a Breit-Wigner shape or discoverinteresting deviations.

How Resonance-Continuum Interference Changes 750 GeV Diphoton Excess: Signal Enhancement and Peak Shift