Search for diphoton resonances in the mass range from 150 to 850 GeV in pp collisions at sqrt(s) = 8 TeV

TL;DR

This paper reports a search for heavy particles decaying into diphotons in proton-proton collisions at 8 TeV, setting limits on production cross sections and interpreting results within two-Higgs-doublet models.

Contribution

First search to analyze diphoton resonances from 150 to 850 GeV at 8 TeV, extending to widths up to 10%, and providing new limits on models.

Findings

No evidence for new diphoton resonances was found.

Set upper limits on production cross sections at 95% confidence level.

Results constrain parameters of two-Higgs-doublet models.

Abstract

Results are presented of a search for heavy particles decaying into two photons. The analysis is based on a 19.7 inverse femtobarn sample of proton-proton collisions at sqrt(s) = 8 TeV collected with the CMS detector at the CERN LHC. The diphoton mass spectrum from 150 to 850 GeV is used to search for an excess of events over the background. The search is extended to new resonances with natural widths of up to 10% of the mass value. No evidence for new particle production is observed and limits at 95% confidence level on the production cross section times branching fraction to diphotons are determined. These limits are interpreted in terms of two-Higgs-doublet model parameters.