Lightest pseudoscalar exchange contribution to light-by-light scattering piece of the muon g−2
| Autor: | Pablo Roig, Adolfo Guevara, Gabriel López Castro |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Quantum chromodynamics
Physics Nuclear and High Energy Physics Particle physics Muon 010308 nuclear & particles physics Scattering FOS: Physical sciences QCD 01 natural sciences Resonance (particle physics) Light scattering Electromagnetic form-factors Nuclear physics Pseudoscalar High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) Pion Resonance Chiral Lagrangians Muon anomalous magnetic moment 0103 physical sciences High Energy Physics::Experiment 1/N expansion Anomaly (physics) 010306 general physics |
| Zdroj: | Nuclear and Particle Physics Proceedings. :2702-2704 |
| ISSN: | 2405-6014 |
| DOI: | 10.1016/j.nuclphysbps.2015.10.036 |
| Popis: | Lightest pseudoscalar (P= pi^0, eta, eta') exchange contribution to the light-by-light (LbL) scattering piece of the muon anomaly, a_mu=(g_mu-2)/2, has been evaluated using a resonance chiral Lagrangian (R\chi L). Best description of pion transition form-factor (TFF) data is obtained with only tiny violations of one of the relations in the minimal consistent set of short-distance constraints on the anomalous R\chi L couplings. eta^{(')} TFF, predicted in terms of the pi TFF and the eta-eta^' mixing, are in good agreement with measurements. With this input, we obtain a_mu^{P,LbL} = (10.47\pm0.54)x10^-10, consistent with the reference determinations in the literature, albeit with smaller error. Comment: 3 pages, 3 figures. Contribution to the Proceedings of the ICHEP 2014 Conference. To be published in Nucl. Phys. B Proc. Suppl |
| Databáze: | OpenAIRE |
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