Abstract
A dark matter model based on QCD-like SU(Nc) gauge theory with electroweakly interacting dark quarks is discussed. Assuming the dark quark mass m is smaller than the dynamical scale Λd ~ 4πfd, the main component of the dark matter is the lightest G-parity odd dark pion associated with chiral symmetry breaking in the dark sector. We show that nonzero dark quark mass induces the universal mass contribution to both G-parity odd and even pions, and their masses tend to be degenerate. As a result, dark pion annihilation into heavier G-parity even dark pion also affects the dark matter relic abundance. Thus, our setup naturally accommodates forbidden dark matter scenario and realizes heavy dark matter whose mass is \( \mathcal{O} \)(1–100) TeV, which is different from conventional electroweakly interacting dark matter such as minimal dark matter. We also discuss CP-violation from the θ-term in the dark gauge sector and find that the predicted size of the electron electric dipole moment can be as large as ∼ 10−32 e cm.
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Acknowledgments
The authors thank Kohei Fujikura, Kunio Kaneta, and Satoshi Shirai for useful comments and discussions. We draw Feynman diagrams using TikZ-Feynhand [116] and TikZ-Feynman [117]. The work is supported in part by JSPS KAKENHI Grant Numbers 21K03549 (T.A.), 23K03415 (R.S.), 24H02236(R.S.), and 24H02244 (R.S.).
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Abe, T., Sato, R. & Yamanaka, T. Composite dark matter with forbidden annihilation. J. High Energ. Phys. 2024, 64 (2024). https://doi.org/10.1007/JHEP09(2024)064
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DOI: https://doi.org/10.1007/JHEP09(2024)064