XENON1T solar axion and the Higgs boson emerging from the dark

Giacomo Cacciapaglia, Chengfeng Cai, Mads T. Frandsen, Martin Rosenlyst, Hong Hao Zhang

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In a recent letter we proposed a new nonthermal mechanism of dark matter production based on vacuum misalignment, where both the Higgs boson and a very light pseudoscalar η emerge from the dark sector. In this paper, we identify the parameter space in a composite scenario where the light pseudoscalar can be produced in the sun and explain the XENON1T excess in electron recoil data. The model's dark matter candidate has a mass around 50 TeV and out of range for direct detection. Testable predictions include gravitational waves at frequencies in the Hz range from a cosmological phase transition, an exotic decay Z→γ+inv with rates 4÷16×10-12 testable at a future Tera-Z collider, and an enhancement by 17÷40% of the branching ratio KL→π0+inv, not enough to explain the KOTO anomaly. All these predictions may be confirmed by future experiments.

TidsskriftPhysical Review D
Udgave nummer7
Antal sider9
StatusUdgivet - 1. okt. 2020

Bibliografisk note

6 pages, 2 figures


  • hep-ph


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