PT Journal
AU Câmara, HB
   Joaquim, FR
   Valle, JWF
TI Dark-sector seeded solution to the strong CP problem
SO Physical Review D
JI Phys. Rev. D
PY 2023
BP 095003
EP 6pp
VL 108
IS 9
DI 10.1103/PhysRevD.108.095003
LA English
AB We propose a novel realization of the Nelson-Barr mechanism "seeded" by a dark sector containing scalars and vectorlike quarks. Charge parity (CP) and a Z8 symmetry are spontaneously broken by the complex vacuum expectation value of a singlet scalar, leaving a residual Z2 symmetry that stabilizes dark matter (DM). A complex Cabibbo-Kobayashi-Maskawa matrix arises via one-loop corrections to the quark mass matrix mediated by the dark sector. In contrast with other proposals where nonzero contributions to the strong CP phase arise at the one-loop level, in our case this occurs only at two loops, enhancing naturalness. Our scenario also provides a viable weakly interacting massive particle scalar DM candidate.
ER