Two-meson form factors in unitarized chiral perturbation theory
| Autor: | Ulf-G. Meißner, Feng-Kun Guo, Chien-Yeah Seng, Yu-Ji Shi, Bastian Kubis, Wei Wang |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Quark
Nuclear and High Energy Physics Chiral perturbation theory Meson Nuclear Theory Physics beyond the Standard Model High Energy Physics::Lattice Scalar (mathematics) FOS: Physical sciences 01 natural sciences High Energy Physics - Experiment Nuclear Theory (nucl-th) High Energy Physics - Experiment (hep-ex) High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences Heavy Quark Physics lcsh:Nuclear and particle physics. Atomic energy. Radioactivity ddc:530 Tensor 010306 general physics Mathematical physics Physics 010308 nuclear & particles physics High Energy Physics::Phenomenology Form factor (quantum field theory) Pseudoscalar High Energy Physics - Phenomenology Chiral Lagrangians lcsh:QC770-798 High Energy Physics::Experiment |
| Zdroj: | Journal of High Energy Physics Journal of high energy physics 2021(4), 86 (2021). doi:10.1007/JHEP04(2021)086 Journal of High Energy Physics, Vol 2021, Iss 4, Pp 1-55 (2021) |
| Popis: | We present a comprehensive analysis of form factors for two light pseudoscalar mesons induced by scalar, vector, and tensor quark operators. The theoretical framework is based on a combination of unitarized chiral perturbation theory and dispersion relations. The low-energy constants in chiral perturbation theory are fixed by a global fit to the available data of the two-meson scattering phase shifts. Each form factor derived from unitarized chiral perturbation theory is improved by iteratively applying a dispersion relation. This study updates the existing results in the literature and explores those that have not been systematically studied previously, in particular the two-meson tensor form factors within unitarized chiral perturbation theory. We also discuss the applications of these form factors as mandatory inputs for low-energy phenomena, such as the semi-leptonic decays $B_s\to \pi^+\pi^-\ell^+\ell^-$ and the $\tau$ lepton decay $\tau\rightarrow\pi^{-}\pi^{0}\nu_{\tau}$, in searches for physics beyond the Standard Model. Comment: 53 pages, 21 figures, 3 tables |
| Databáze: | OpenAIRE |
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