Abstract
We propose a new physics model which has a cold dark matter candidate and can explain the b → sμ+μ− anomaly at the same time. Our model includes a scalar quark \( \tilde{q} \) and a scalar lepton \( \tilde{\ell} \) which are SU(2)L-doublet as well as a Dirac fermion N which is SU(2)L-singlet. The new particles are charged under a gauged U(1)X group which is spontaneously broken to a discrete Z2 symmetry by a dark scalar S. The remnant Z2 symmetry stabilizes the dark matter. Box diagrams with \( \tilde{q} \), \( \tilde{\ell} \), and N running inside the loop can generate the correct Wilson coefficients C μ9 = − C μ10 to accommodate the b → sμ+μ− anomaly while avoiding constraints such as \( {B}_s-{\overline{B}}_s \) mixing. The dark matter annihilation into a second generation lepton pair via t-channel \( \tilde{\ell} \)-exchanging process plays an important role in producing the current dark matter relic abundance of the universe, showing a strong interplay between the flavor and dark matter physics. We also discuss dark-gauge-interaction-dominated and Higgs-portal-dominated scenarios for dark matter physics.
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Baek, S., Yu, C. Dark matter for b → sμ+μ− anomaly in a gauged U(1)X model. J. High Energ. Phys. 2018, 54 (2018). https://doi.org/10.1007/JHEP11(2018)054
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DOI: https://doi.org/10.1007/JHEP11(2018)054