2026-04-14T07:31:00Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2222052025-12-10T00:38:12Zcom_2072_1057col_2072_478823col_2072_478917

Improved π0,η,η′ transition form factors in resonancechiral theory and their aHLbL μ contribution Estrada, Emilio J. Gonzàlez-Solís, Sergi Guevara, Adolfo Roig, Pablo Electrodinàmica quàntica Física nuclear Teoria quàntica de camps Quantum electrodynamics Nuclear physics Quantum field theory Working with Resonance Chiral Theory, within the two resonance multiplets saturation scheme, we satisfy leading (and some subleading) chiral and asymptotic QCD constraints and accurately fit simultaneously the π0,η,η′transition form factors, for single and double virtuality. In the latter case, we supplement the few available measurements with lattice data to ensure a faithful description. Mainly due to the new results for the doubly virtual case, we improve over existing descriptions for the η and η′. Our evaluationof the corresponding pole contributions to the hadronic light-by-light piece of the muon g−2 read: aπ0-pole µ=(61.9 ±0.6+2.4−1.5)×10−11, aη-poleµ=(15.2 ±0.5+1.1−0.8)×10−11 and aη′-poleµ=(14.2 ±0.7+1.4−0.9)×10−11, for a total of aπ0+η+η′-poleµ= (91.3 ±1.0+3.0−1.9)×10−11, where the first and second errors are the statistical and systematic uncertainties, respectively. 2025-07-14T11:30:01Z 2025-07-14T11:30:01Z 2024-12-27 2025-07-14T11:30:01Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1126-6708 https://hdl.handle.net/2445/222205 755933 eng Reproducció del document publicat a: https://doi.org/10.1007/JHEP12(2024)203 Journal of High Energy Physics, 2024, vol. 12 https://doi.org/10.1007/JHEP12(2024)203 cc-by (c) Emilio J. Estrada et al., 2024 http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess 48 p. application/pdf Springer Verlag Articles publicats en revistes (Física Quàntica i Astrofísica)