The rho meson decay constants f_parallel = 215 MeV, f_perp = 173 MeV, f_A = 122 MeV, and f_S = 61 MeV, together with twist-2, twist-3, and twist-4 distribution amplitudes, are extracted consistently from vector, tensor, axial-vector, and scalar currents in a self-consistent light-front quark model.
Abe et al.(Belle-II), Belle II Technical Design Report, (2010)
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Beyond leading twist: $\rho$ meson decay constants and distribution amplitudes in a self-consistent light-front quark model
The rho meson decay constants f_parallel = 215 MeV, f_perp = 173 MeV, f_A = 122 MeV, and f_S = 61 MeV, together with twist-2, twist-3, and twist-4 distribution amplitudes, are extracted consistently from vector, tensor, axial-vector, and scalar currents in a self-consistent light-front quark model.