Work

Lightest pseudoscalar exchange contribution to light-by-light scattering piece of the muon g− 2

Year: 2016

Type: article

Abstract: Lightest pseudoscalar (P=π0,η,η′) exchange contribution to the light-by-light (LbL) scattering piece of the muon anomaly, aμ=(gμ−2)/2, has been evaluated using a resonance chiral Lagrangian (RχL). 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 RχL couplings. η(′)TFF, predicted in terms of the πTFF and the η−η′ mixing, are in good agreement with measurements. With this input, we obtain aμP,LbL=(10.47±0.54)⋅10−10, consistent with the reference determinations in the literature, albeit with smaller error.

Source: Nuclear and Particle Physics Proceedings

DOI: 10.1016/j.nuclphysbps.2015.10.036

Authors: Pablo Roig, Adolfo Guevara, Gabriel López Castro

Institutions: Universidad Nacional Autónoma de México, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional

Language: English

Topic: Particle physics theoretical and experimental studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $1,640

Funders: Consejo Nacional de Ciencia y Tecnología, Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México