Abstract
We introduce the effective field theory of two different light dark particles interacting with the standard model (SM) light states in a single vertex, termed dark sector effective field theory (DSEFT). We focus on the new light particles with spin up to 1 and being real in essence, namely, new real scalars ϕ and S, Majorana fermions χ and ψ, and real vectors Xμ and Vμ. In the framework of low energy effective field theory with QED and QCD symmetry, the DSEFT can be classified into six categories, including the scalar-scalar-SM (ϕS-SM), fermion-fermion-SM (χψ-SM), vector-vector-SM (XV-SM), scalar-fermion-SM (ϕχ-SM), scalar-vector-SM (ϕX-SM), and fermion-vector-SM (χX-SM) cases. For each case, we construct the effective operator basis up to canonical dimension 7, which will cover most interesting phenomenology at low energy. As a phenomenological example, we investigate the longstanding neutron lifetime anomaly through the neutron dark decay modes n → χϕ or χX from the effective interactions in the fermion-scalar-SM or fermion-vector-SM case. When treating the light fermion as a dark matter candidate, we also explore the constraints from DM-neutron annihilation signal at Super-Kamiokande. We find the neutron dark decay in each scenario can accommodate the anomaly, at the same time, without contradicting with the Super-Kamiokande limit.
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Acknowledgments
This work was supported in part by the Guangdong Major Project of Basic and Applied Basic Research No. 2020B0301030008, and by the Grants No. NSFC-12035008, No. NSFC-11975130, No. NSFC-12247151, and No. NSFC-12305110.
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Liang, JH., Liao, Y., Ma, XD. et al. Dark sector effective field theory. J. High Energ. Phys. 2023, 172 (2023). https://doi.org/10.1007/JHEP12(2023)172
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DOI: https://doi.org/10.1007/JHEP12(2023)172