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Sep 5 – 9, 2022
online
US/Eastern timezone
Thank you to all the participants for a great QNP2022!

The Primakoff Experimental Program at Jefferson Lab

Sep 7, 2022, 1:00 PM
25m
online

online

FSU, Tallahassee, FL, USA

Speaker

Liping Gan (University of NC Wilmington)

Description

The system of light pseudoscalar meson π0, η and η' provide a unique laboratory to probe fundamental QCD symmetries at the confinement scale. While π0 and η are Goldstone bosons due to spontaneous chiral symmetry breaking, η' is not due to an axial U(1) anomaly. There is a second type of chiral anomaly driving the two-photon decays of these mesons. This system harbors information about the effects of SU(3) symmetry and the mixing phenomena of the mesons due to isospin symmetry breaking. A study of this system will have important impact on the low-energy QCD: testing the chiral anomaly and probing the origin and dynamics of chiral symmetry breaking; offering a clean path for model independent determinations of the light quark-mass ratio and the η-ηꞌ mixing angle; and providing inputs to calculate the hadronic light-by-light scattering corrections to the anomalous magnetic moment of the muon. A comprehensive experimental program has been developed at Jefferson Laboratory (JLab) to perform high precision measurements of the two-photon decay widths and the transition form factors of π0, η and η' via the Primakoff effect. A measurement of the π0 radiative decay width was carried out at JLab 6 GeV and the published result achieved a precision of 1.5%. A measurement of the η radiative decay width is currently on-going with a 11 GeV tagged photon beam. The status of this program and its physics impact will be discussed.

speaker affiliation University of North Carolina Wilmington

Primary author

Liping Gan (University of NC Wilmington)

Presentation materials