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024 7 _ |a 10.1007/JHEP04(2021)086
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024 7 _ |a 1126-6708
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082 _ _ |a 530
100 1 _ |a Shi, Yu-Ji
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245 _ _ |a Two-meson form factors in unitarized chiral perturbation theory
260 _ _ |a [Trieste]
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520 _ _ |a 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 Bs → π+π−ℓ+ℓ− and the τ lepton decay τ → π−π0ντ, in searches for physics beyond the Standard Model.
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700 1 _ |a Seng, Chien-Yeah
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700 1 _ |a Guo, Feng-Kun
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700 1 _ |a Kubis, Bastian
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700 1 _ |a Meißner, Ulf-G.
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700 1 _ |a Wang, Wei
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773 _ _ |a 10.1007/JHEP04(2021)086
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856 4 _ |y OpenAccess
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856 4 _ |y OpenAccess
|u https://juser.fz-juelich.de/record/891856/files/Shi2021_Article_Two-mesonFormFactorsInUnitariz.pdf
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