A Loop-philic Pseudoscalar
Abstract
We construct a weakly-coupled renormalizable model to explain the 750GeV diphoton excess. The 750GeV resonance (denoted as X(750)) is interpreted as a pseudoscalar coming from a complex singlet. The model also naturally provides a dark matter candidate. One most attractive feature of the model is that decays of X(750) are all loop-induced so the diphoton rate is not diluted by unwanted tree level branching fractions. Relevant Yukawa interactions need not to be tuned to near non-perturbative region to explain the rate. The model is highly predictive, including the pseudoscalar nature of X(750), and two nearly mass-degenerate exotic quarks carrying electric charge 5/3 and 2/3, respectively. Rich phenomenology is expected with respect to collider searches, flavor physics and dark matter detection, if X(750) can be pinned down by future LHC experiments.
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