Helicity form factors for D(s )→A ℓ ν process in the light-cone QCD sum rules approach
Abstract
The helicity form factors of the D(s )→A ℓ+ν with A =a1-,a10,b1-,b10,K1(1270 ) and K1(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 q2. 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.
- Publication:
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European Physical Journal C
- Pub Date:
- June 2020
- DOI:
- 10.1140/epjc/s10052-020-8084-6
- arXiv:
- arXiv:2004.02522
- Bibcode:
- 2020EPJC...80..553M
- Keywords:
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- High Energy Physics - Phenomenology
- E-Print:
- European Physical Journal C 80(6) 2020