B → Dℓν ℓ form factors beyond leading power and extraction of |V cb | and R(D)
Abstract We investigate the subleading-power corrections to the exclusive B → Dℓν ℓ form factors at O $$ \mathcal{O} $$ ( α s 0 $$ {\alpha}_s^0 $$ ) in the light-cone sum rules (LCSR) framework by including the two- and three-particle higher-twist contributions from the B-meson light-cone distributi...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2022-05-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP05(2022)024 |
| _version_ | 1818251086727741440 |
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| author | Jing Gao Tobias Huber Yao Ji Chao Wang Yu-Ming Wang Yan-Bing Wei |
| author_facet | Jing Gao Tobias Huber Yao Ji Chao Wang Yu-Ming Wang Yan-Bing Wei |
| author_sort | Jing Gao |
| collection | DOAJ |
| description | Abstract We investigate the subleading-power corrections to the exclusive B → Dℓν ℓ form factors at O $$ \mathcal{O} $$ ( α s 0 $$ {\alpha}_s^0 $$ ) in the light-cone sum rules (LCSR) framework by including the two- and three-particle higher-twist contributions from the B-meson light-cone distribution amplitudes up to the twist-six accuracy, by taking into account the subleading terms in expanding the hard-collinear charm-quark propagator, and by evaluating the hadronic matrix element of the subleading effective current . Employing further the available leading-power results for the semileptonic B → D form factors at the next-to- leading-logarithmic level and combining our improved LCSR predictions with the recent lattice determinations, we then carry out a comprehensive phenomenological analysis on the semi-leptonic B → Dℓν ℓ decay. We extract V cb = 40.2 − 0.5 + 0.6 th − 1.4 + 1.4 exp × 10 − 3 V cb = 40.9 − 0.5 + 0.6 th − 1.0 + 1.0 exp × 10 − 3 $$ \left|{V}_{cb}\right|=\left({40.2}_{-0.5}^{+0.6}{\left|{{}_{\mathrm{th}}}_{-1.4}^{+1.4}\right|}_{\mathrm{exp}}\right)\times {10}^{-3}\left(\left|{V}_{cb}\right|=\left({40.9}_{-0.5}^{+0.6}{\left|{{}_{\mathrm{th}}}_{-1.0}^{+1.0}\right|}_{\mathrm{exp}}\right)\times {10}^{-3}\right) $$ using the BaBar (Belle) experimental data, and particularly obtain for the gold-plated ratio R(D) = 0.302 ± 0.003. |
| first_indexed | 2024-12-12T16:02:42Z |
| format | Article |
| id | doaj.art-029e3a8273dc4c069727e6889ba63863 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-12T16:02:42Z |
| publishDate | 2022-05-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-029e3a8273dc4c069727e6889ba638632022-12-22T00:19:23ZengSpringerOpenJournal of High Energy Physics1029-84792022-05-012022514710.1007/JHEP05(2022)024B → Dℓν ℓ form factors beyond leading power and extraction of |V cb | and R(D)Jing Gao0Tobias Huber1Yao Ji2Chao Wang3Yu-Ming Wang4Yan-Bing Wei5School of Physics, Nankai UniversityTheoretische Physik 1, Naturwissenschaftlich-Technische Fakultät, Universität SiegenTheoretische Physik 1, Naturwissenschaftlich-Technische Fakultät, Universität SiegenSchool of Physics, Nankai UniversitySchool of Physics, Nankai UniversitySchool of Physics, Nankai UniversityAbstract We investigate the subleading-power corrections to the exclusive B → Dℓν ℓ form factors at O $$ \mathcal{O} $$ ( α s 0 $$ {\alpha}_s^0 $$ ) in the light-cone sum rules (LCSR) framework by including the two- and three-particle higher-twist contributions from the B-meson light-cone distribution amplitudes up to the twist-six accuracy, by taking into account the subleading terms in expanding the hard-collinear charm-quark propagator, and by evaluating the hadronic matrix element of the subleading effective current . Employing further the available leading-power results for the semileptonic B → D form factors at the next-to- leading-logarithmic level and combining our improved LCSR predictions with the recent lattice determinations, we then carry out a comprehensive phenomenological analysis on the semi-leptonic B → Dℓν ℓ decay. We extract V cb = 40.2 − 0.5 + 0.6 th − 1.4 + 1.4 exp × 10 − 3 V cb = 40.9 − 0.5 + 0.6 th − 1.0 + 1.0 exp × 10 − 3 $$ \left|{V}_{cb}\right|=\left({40.2}_{-0.5}^{+0.6}{\left|{{}_{\mathrm{th}}}_{-1.4}^{+1.4}\right|}_{\mathrm{exp}}\right)\times {10}^{-3}\left(\left|{V}_{cb}\right|=\left({40.9}_{-0.5}^{+0.6}{\left|{{}_{\mathrm{th}}}_{-1.0}^{+1.0}\right|}_{\mathrm{exp}}\right)\times {10}^{-3}\right) $$ using the BaBar (Belle) experimental data, and particularly obtain for the gold-plated ratio R(D) = 0.302 ± 0.003.https://doi.org/10.1007/JHEP05(2022)024NLO ComputationsQCD Phenomenology |
| spellingShingle | Jing Gao Tobias Huber Yao Ji Chao Wang Yu-Ming Wang Yan-Bing Wei B → Dℓν ℓ form factors beyond leading power and extraction of |V cb | and R(D) Journal of High Energy Physics NLO Computations QCD Phenomenology |
| title | B → Dℓν ℓ form factors beyond leading power and extraction of |V cb | and R(D) |
| title_full | B → Dℓν ℓ form factors beyond leading power and extraction of |V cb | and R(D) |
| title_fullStr | B → Dℓν ℓ form factors beyond leading power and extraction of |V cb | and R(D) |
| title_full_unstemmed | B → Dℓν ℓ form factors beyond leading power and extraction of |V cb | and R(D) |
| title_short | B → Dℓν ℓ form factors beyond leading power and extraction of |V cb | and R(D) |
| title_sort | b dlν l form factors beyond leading power and extraction of v cb and r d |
| topic | NLO Computations QCD Phenomenology |
| url | https://doi.org/10.1007/JHEP05(2022)024 |
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