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arXiv · 1603.06566

Comments on the diphoton excess: critical reappraisal of effective field theory interpretations

Jernej F. Kamenik·Benjamin R. Safdi·Yotam Soreq·Jure Zupan
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Abstract

We consider the diphoton excess observed by ATLAS and CMS using the most up-to-date data and estimate the preferred enhancement in the production rate between 8 TeV and 13 TeV. Within the framework of effective field theory (EFT), we then show that for both spin-0 and spin-2 Standard Model (SM) gauge-singlet resonances, two of the three processes S to ZZ, S to Z gamma, and S to WW must occur with a non-zero rate. Moreover, we demonstrate that these branching ratios are highly correlated in the EFT. Couplings of S to additional SM states may be constrained and differentiated by comparing the S production rates with and without the vector-boson fusion (VBF) cuts. We find that for a given VBF to inclusive production ratio there is maximum rate of S to gauge bosons, b b-bar, and lighter quark anti-quark pairs. Simultaneous measurements of the width and the VBF ratio may be able to point towards the existence of hidden decays.

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Jernej F. Kamenik, Benjamin R. Safdi, Yotam Soreq, Jure Zupan. 2016-07-12. Comments on the diphoton excess: critical reappraisal of effective field theory interpretations. https://doi.org/10.1007/jhep07(2016)042

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