Dark matter for b -> s mu (+) mu (-) anomaly in a gauged U(1) (X) model

초록

We propose a new physics model which has a cold dark matter candidate and can explain the b -> s mu (+) mu (-) anomaly at the same time. Our model includes a scalar quark and a scalar lepton 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 Z (2) symmetry by a dark scalar S. The remnant Z (2) symmetry stabilizes the dark matter. Box diagrams with , , and N running inside the loop can generate the correct Wilson coefficients C (9) (mu) = - C (10) (mu) to accommodate the b -> s mu (+) mu (-) anomaly while avoiding constraints such as mixing. The dark matter annihilation into a second generation lepton pair via t-channel -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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