A new composite axion model in which the Pati-Salam gauge group emerges from strong dynamics, yielding a high-quality accidental PQ symmetry and a fixed axion-photon coupling ratio E/N = -7/3.
The Precision nEDM Measurement with UltraCold Neutrons at TRIUMF
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abstract
The TRIUMF Ultra-Cold Advanced Neutron (TUCAN) collaboration aims at a precision neutron electric dipole moment (nEDM) measurement with an uncertainty of $10^{-27}\,e\cdot\mathrm{cm}$, which is an order-of-magnitude better than the current nEDM upper limit and enables us to test Supersymmetry. To achieve this precision, we are developing a new high-intensity ultracold neutron (UCN) source using super-thermal UCN production in superfluid helium (He-II) and a nEDM spectrometer. The current development status of them is reported in this article.
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A High-Quality Composite Pati-Salam Axion
A new composite axion model in which the Pati-Salam gauge group emerges from strong dynamics, yielding a high-quality accidental PQ symmetry and a fixed axion-photon coupling ratio E/N = -7/3.