Toward a coherent solution of diphoton and flavor anomalies

Abstract

We propose a coherent explanation for the 750 GeV diphoton anomaly and the hints of deviations from Lepton Flavor Universality in B decays in terms a new strongly interacting sector with vectorlike confinement. The diphoton excess arises from the decay of one of the pseudo-Nambu-Goldstone bosons of the new sector, while the flavor anomalies are a manifestation of the exchange of the corresponding vector resonances (with masses in the 1.5-2.5 TeV range). We provide explicit examples (with detailed particle content and group structure) of the new sector, discussing both the low-energy flavor-physics phenomenology and the signatures at high $p_T$. We show that specific models can provide an excellent fit to all available data. A key feature of all realizations is a sizable broad excess in the tails of ${\tau }^{+}{\tau }^{-}$ invariant mass distribution in $pp\to {\tau }^{+}{\tau }^{-}$, that should be accessible at the LHC in the near future.

arXiv commentv2: 32 pages, 9 figures, 2 tables. Published version. Extended discussion about the flavor structure of the model and high-PT phenomenology, typos corrected. Added note about the relevance of the paper in light of the absence of the diphoton signal at the LHC

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