Eur. Phys. J. C (2016) 76: 516
https://doi.org/10.1140/epjc/s10052-016-4349-5

Special Article - Tools for Experiment and Theory

Precision tools and models to narrow in on the 750 GeV diphoton resonance

¹ Theoretical Physics Department, CERN, Geneva, Switzerland
² ARC Centre of Excellence for Particle Physics at the Terascale, School of Physics, Monash University, Melbourne, VIC, 3800, Australia
³ CPPM, Aix-Marseille Université, CNRS-IN2P3, UMR 7346, 163 avenue de Luminy, 13288, Marseille Cedex 9, France
⁴ LPTHE, UMR 7589, CNRS and Université Pierre et Marie Curie, Sorbonne Universités, 75252, Paris Cedex 05, France
⁵ Department of Physics, ARC Centre of Excellence for Particle Physics at the Terascale, The University of Adelaide, Adelaide, SA, 5005, Australia
⁶ Bethe Center for Theoretical Physics and Physikalisches Institut der Universität Bonn, Nussallee 12, 53115, Bonn, Germany
⁷ Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, 69978, Tel Aviv, Israel
⁸ Instituto de Física Corpuscular (CSIC-Universitat de València), Apdo. 22085, 46071, Valencia, Spain
⁹ Deutsches Elektronen-Synchrotron DESY, 22607, Hamburg, Germany

^* e-mail: florian.staub@cern.ch

Received: 18 May 2016
Accepted: 29 August 2016
Published online: 23 September 2016

Abstract

The hints for a new resonance at 750 GeV from ATLAS and CMS have triggered a significant amount of attention. Since the simplest extensions of the standard model cannot accommodate the observation, many alternatives have been considered to explain the excess. Here we focus on several proposed renormalisable weakly-coupled models and revisit results given in the literature. We point out that physically important subtleties are often missed or neglected. To facilitate the study of the excess we have created a collection of 40 model files, selected from recent literature, for the Mathematica package SARAH. With SARAH one can generate files to perform numerical studies using the tailor-made spectrum generators FlexibleSUSY and SPheno. These have been extended to automatically include crucial higher order corrections to the diphoton and digluon decay rates for both CP-even and CP-odd scalars. Additionally, we have extended the UFO and CalcHep interfaces of SARAH, to pass the precise information about the effective vertices from the spectrum generator to a Monte-Carlo tool. Finally, as an example to demonstrate the power of the entire setup, we present a new supersymmetric model that accommodates the diphoton excess, explicitly demonstrating how a large width can be obtained. We explicitly show several steps in detail to elucidate the use of these public tools in the precision study of this model.