Potential of light-cone sum rules without semiglobal quark-hadron duality
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| Format: | Preprint |
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2024
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| _version_ | 1866916542819598336 |
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| author | Carvunis, A. Mahmoudi, F. Monceaux, Y. |
| author_facet | Carvunis, A. Mahmoudi, F. Monceaux, Y. |
| contents | This work addresses the calculation of local form factors involved in the theoretical predictions of semileptonic $B$-meson decays at low $q^2$. We present a new approach to the method of QCD light-cone sum rule with $B$-meson light-cone distribution amplitudes. In our strategy, we bypass the semiglobal quark-hadron duality (QHD) approximation which usually contributes an unknown and potentially large systematic error to the prediction of form factors. We trade this improvement for an increased reliance on higher-order contributions in perturbation theory. Unlike the systematic error from semiglobal QHD, truncation errors are assessable and systematically improvable, hence allowing robust predictions of form factors. For the transitions $B\to π,ρ,K^{(*)}$, our predictions agree with the literature for all form factors at $q^2=0$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_01290 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Potential of light-cone sum rules without semiglobal quark-hadron duality Carvunis, A. Mahmoudi, F. Monceaux, Y. High Energy Physics - Phenomenology This work addresses the calculation of local form factors involved in the theoretical predictions of semileptonic $B$-meson decays at low $q^2$. We present a new approach to the method of QCD light-cone sum rule with $B$-meson light-cone distribution amplitudes. In our strategy, we bypass the semiglobal quark-hadron duality (QHD) approximation which usually contributes an unknown and potentially large systematic error to the prediction of form factors. We trade this improvement for an increased reliance on higher-order contributions in perturbation theory. Unlike the systematic error from semiglobal QHD, truncation errors are assessable and systematically improvable, hence allowing robust predictions of form factors. For the transitions $B\to π,ρ,K^{(*)}$, our predictions agree with the literature for all form factors at $q^2=0$. |
| title | Potential of light-cone sum rules without semiglobal quark-hadron duality |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2404.01290 |