Helicity form factors for D(s)→Aℓν process in the light-cone QCD sum rules approach.

Momeni, S.

The helicity form factors of the D (s) → A ℓ ν with A = a 1 - , a 1 0 , b 1 - , b 1 0 , K 1 (1270) and K 1 (1400) are calculated in the light-cone sum rules approach, up to twist-3 distribution amplitudes of the axial vector meson A. In the helicity form factors parametrization the unitarity constraints are applied to the fitting parameters. In addition, the effects of the low-lying resonances are included in series expansions of aforementioned form factors. The properties of the D (s) → A ℓ ν semileptonic decays are studied by extending the form factors to the whole physical region of q 2 . For a better analysis, a comparison is also made between our results and the predictions obtained using transition form factors via LCSR, 3PSR and CLFQM methods.

VECTOR mesons; RESONANCE effect; FORECASTING; MESONS

European Physical Journal C -- Particles & Fields, 2020, Vol 80, Issue 6, p1

1434-6044

Academic Journal

10.1140/epjc/s10052-020-8084-6