Speaker
Dr
Ilya Larin
(University of Massachusetts Amherst)
Description
The π 0 →γγ decay amplitude is determined by the chiral anomaly. Recent theoretical calculations
have been made within Chiral Perturbation Theory and predict decay width at a percent precision
level. Precise measurement of π 0 →γγ decay width gives a possibility to check these predictions.
The PrimEx experiment unutilized Primakoff effect to measure π 0 radiative decay width.
Primakoff effect is a powerful tool for measuring radiative width of particles. In this talk, the final
result of the PrimEx experiment performed in Hall-B at Jefferson Lab will be presented. The
PrimEx-I experiment performed in 2004 achieved precision of 2.8%. PrimEx-II has been
conducted in 2010 with a collection of five times more statistics and achieved 1.6% precision.
η→γγ decay width measurement experiment planned at Jefferson Lab will also be discussed. The
project was supported in part by NSF MRI PHY 0079840 and RFBR 18-02-00938.
Primary author
Dr
Ilya Larin
(University of Massachusetts Amherst)
