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arXiv · 1512.08255

A Loop-philic Pseudoscalar

Gang Li·Ying-nan Mao·Yi-Lei Tang·Chen Zhang·Yang Zhou·Shou-hua Zhu
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Abstract

We construct a weakly-coupled renormalizable model to explain the $750\mbox{GeV}$ diphoton excess. The $750\mbox{GeV}$ 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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Gang Li, Ying-nan Mao, Yi-Lei Tang, Chen Zhang, Yang Zhou, Shou-hua Zhu. 2016-01-04. A Loop-philic Pseudoscalar. https://doi.org/10.1103/physrevlett.116.151803

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