{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/b-to-k-ell-ell-decays-at-large-recoil-in-the","title":"$B\\to K^* \\ell^+ \\ell^-$ decays at large recoil in the Standard Model: a theoretical reappraisal","arxiv_id":"1512.07157","date":"2015-12-22","proceeding":null,"authors":["Marco Ciuchini","Marco Fedele","Enrico Franco","Satoshi Mishima","Ayan Paul","Luca Silvestrini","Mauro Valli"],"abstract":"We critically reassess the theoretical uncertainties in the Standard Model calculation of the $B \\to K^* \\ell^+ \\ell^-$ observables, focusing on the low $q^2$ region. We point out that even optimized observables are affected by sizable uncertainties, since hadronic contributions generated by current-current operators with charm are difficult to estimate, especially for $q^2 \\sim 4 m_c^2\\simeq 6.8$ GeV$^2$. We perform a detailed numerical analysis and present both predictions and results from the fit obtained using most recent data. We find that non-factorizable power corrections of the expected order of magnitude are sufficient to give a good description of current experimental data within the Standard Model. We discuss in detail the $q^2$ dependence of the corrections and their possible interpretation as shifts of the Standard Model Wilson coefficients.","url_abs":"https://arxiv.org/abs/1512.07157v2","url_pdf":"https://arxiv.org/pdf/1512.07157v2.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"b-to-k-ell-ell-decays-at-large-recoil-in-the","repo_url":"https://github.com/silvest/HEPfit","is_official":1,"mentioned_in_paper":0,"mentioned_in_github":0,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}