Impact on $L$-observables of a new combined analysis of $B_{d,s}\to K^{(*)}$ form factors
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912702966792192 |
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| author | Biswas, Aritra Gubernari, Nico Matias, Joaquim Tetlalmatzi-Xolocotzi, Gilberto |
| author_facet | Biswas, Aritra Gubernari, Nico Matias, Joaquim Tetlalmatzi-Xolocotzi, Gilberto |
| contents | We explore the impact of a combined analysis of $B_{d,s}\to K^{(*)}$ form factors on a set of $L$-observables. The $L$-observables are constructed from ratios of branching fractions in $B_{s}\to VV,PP,PV$ versus $B_d \to VV,PP,PV$ decays with $P=K^0,\bar{K}^0$ and $V=K^{*0},\bar{K}^{*0}$, thereby partially reducing their hadronic uncertainties. We show the change of the Standard Model predictions of the $L$-observables under different determinations of the ratio of the relevant form factors (with correlations) including lattice QCD data and a novel light-cone sum rule analysis. In addition, we provide precise results for all $B_{d,s} \to K^{(*)}$ form factors in machine-readable files. We find that the inclusion of our up-to-date results, as well as the use or omission of lattice QCD data for the form factors, has a significant impact on the $L$-observables. We also discuss how the New Physics interpretation is affected by the updated form factors and present revised predictions for the mechanism identified in our analysis of $B \to VP$ decays, now employing more suitable new experimental observables defined in this paper. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_12478 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Impact on $L$-observables of a new combined analysis of $B_{d,s}\to K^{(*)}$ form factors Biswas, Aritra Gubernari, Nico Matias, Joaquim Tetlalmatzi-Xolocotzi, Gilberto High Energy Physics - Phenomenology High Energy Physics - Lattice We explore the impact of a combined analysis of $B_{d,s}\to K^{(*)}$ form factors on a set of $L$-observables. The $L$-observables are constructed from ratios of branching fractions in $B_{s}\to VV,PP,PV$ versus $B_d \to VV,PP,PV$ decays with $P=K^0,\bar{K}^0$ and $V=K^{*0},\bar{K}^{*0}$, thereby partially reducing their hadronic uncertainties. We show the change of the Standard Model predictions of the $L$-observables under different determinations of the ratio of the relevant form factors (with correlations) including lattice QCD data and a novel light-cone sum rule analysis. In addition, we provide precise results for all $B_{d,s} \to K^{(*)}$ form factors in machine-readable files. We find that the inclusion of our up-to-date results, as well as the use or omission of lattice QCD data for the form factors, has a significant impact on the $L$-observables. We also discuss how the New Physics interpretation is affected by the updated form factors and present revised predictions for the mechanism identified in our analysis of $B \to VP$ decays, now employing more suitable new experimental observables defined in this paper. |
| title | Impact on $L$-observables of a new combined analysis of $B_{d,s}\to K^{(*)}$ form factors |
| topic | High Energy Physics - Phenomenology High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2506.12478 |