Authors: Sunghoon Jung Jeonghyeon Song Yeo Woong Yoon
Publish Date: 2016/05/02
Volume: 2016, Issue: 5, Pages: 9-
Abstract
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 imaginarypart interference and 2 distorting resonance shape due to the realpart interference We study them based on the bestfit analysis of two benchmark models two Higgs doublets with ∼50 GeV width exhibiting the imaginarypart interference effect and a singlet scalar with 5 GeV width exhibiting the realpart one both extended with vectorlike fermions We find that the resonance contribution can be enhanced by a factor of 2 16 for 3 6 fb signal rate or the 68 CL allowed mass region is shifted by mathcalO 1 GeV If the bestfit excess rate decreases in the future data the interference effects will become more significantThis article is published under an open access license Please check the Copyright Information section for details of this license and what reuse is permitted If your intended use exceeds what is permitted by the license or if you are unable to locate the licence and reuse information please contact the Rights and Permissions team
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