Khodjamirian, Alexander; Melić, Blaženka; Wang, Yu-Ming; Wei, Yan-Bing (2021) The D∗Dπ and B∗Bπ couplings from light-cone sum rules. The Journal of high energy physics, 2021 (3). ISSN 1126-6708
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Abstract
We revisit the calculation of the strong couplings D∗Dπ and B∗Bπ from the QCD light-cone sum rules using the pion light-cone distribution amplitudes. The accuracy of the correlation function, calculated from the operator product expansion near the light-cone, is upgraded by taking into account the gluon radiative corrections to the twist-3 terms. The double spectral density of the correlation function, including the twist-2, 3 terms at O(αs) and the twist-4 LO terms, is presented in an analytical form for the first time. This form allows us to use various versions of the quark-hadron duality regions in the double dispersion relation underlying the sum rules. We predict gD∗Dπ=14.1+1.3−1.2 and gB∗Bπ=30.0+2.6−2.4 when the decay constants of heavy mesons entering the light-cone sum rule are taken from lattice QCD results. We compare our results with the experimental value for the charmed meson coupling and with the lattice QCD calculations.
| Item Type: | Article | ||||||||||||
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| Uncontrolled Keywords: | QCD ; B meson ; D meson ; LCSR ; strong constant | ||||||||||||
| Subjects: | NATURAL SCIENCES > Physics | ||||||||||||
| Divisions: | Theoretical Physics Division | ||||||||||||
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| Depositing User: | Blaženka Melić | ||||||||||||
| Date Deposited: | 29 Jun 2021 11:02 | ||||||||||||
| URI: | http://fulir.irb.hr/id/eprint/6469 | ||||||||||||
| DOI: | 10.1007/jhep03(2021)016 |
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