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Advances in High Energy Physics
Volume 2018, Article ID 9150617, 14 pages
Research Article

Exclusion Limits on a Scalar Decaying to Photons and Distinguishing Its Production Mechanisms

Department of Physics and Astronomy, Uppsala University, Box 516, 751 20 Uppsala, Sweden

Correspondence should be addressed to Tanumoy Mandal; es.uu.scisyhp@ladnam.yomunat

Received 7 July 2017; Revised 21 November 2017; Accepted 11 December 2017; Published 9 January 2018

Academic Editor: Luca Stanco

Copyright © 2018 Tanumoy Mandal. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The publication of this article was funded by SCOAP3.


LHC run-II has a great potential to search for new resonances in the diphoton channel. Latest 13 TeV data already put stringent limits on the cross sections in the diphoton channel assuming the resonance is produced through the gluon-gluon fusion. Many beyond the Standard Model (SM) theories predict TeV-scale scalars, which copiously decay to diphotons. Apart from the gluon-gluon fusion production, these scalars can also be dominantly produced in other ways too at the LHC, namely, through the quark-quark fusion or the gauge boson fusions like the photon-photon, photon-, , or fusions. In this paper we use an effective field theory approach where a heavy scalar can be produced in various ways and recast the latest ATLAS diphoton resonance search to put model-independent limits on its mass and effective couplings to the SM particles. If a new scalar is discovered at the LHC, it would be very important to identify its production mechanism in order to probe the nature of the underlying theory. We show that combining various kinematic variables in a multivariate analysis can be very powerful to distinguish different production mechanisms from one another.