TL;DR
This paper investigates the implications of the 750 GeV diphoton excess at the LHC, suggesting that new physics likely appears near the TeV scale, especially if the resonance's width is large, based on renormalization group analysis.
Contribution
The study provides a detailed renormalization group analysis to estimate the scale of new physics associated with the 750 GeV diphoton resonance, considering various model parameters and their effects.
Findings
The new physics scale is generally close to the TeV range.
Increasing VLQ copies or charges can raise the cutoff scale.
A large resonance width implies new particles should be near the TeV scale.
Abstract
A very plausible explanation for the recently observed diphoton excess at the 13 TeV LHC is a (pseudo)scalar with mass around 750 GeV, which couples to a gluon pair and to a photon pair through loops involving vector-like quarks (VLQs). To accommodate the observed rate, the required Yukawa couplings tend to be large. A large Yukawa coupling would rapidly run up with the scale and quickly reach the perturbativity bound, indicating that new physics, possibly with a strong dynamics origin, is near by. The case becomes stronger especially if the ATLAS observation of a large width persists. In this paper we study the implication on the scale of new physics from the 750 GeV diphoton excess using the method of renormalization group running with careful treatment of different contributions and perturbativity criterion. Our results suggest that the scale of new physics is generically not much…
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