The goal of the PrimEx Collaboration. Make a high precision measurement of the po to gg decay rate dominated by the axial anomaly.This will be done using the Primakoff Effect, photopion production in the Coulomb field of the nucleus.Using the tagged photon facility in Hall B, a state of the art
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A Precision Measurement of the Neutral Pion Lifetime via the Primakoff EffectJefferson Lab Experiment E99-014PrimEx Collaboration
Eric R. I. Clinton
Rory Miskimen, PhD., Advisor
Given at NNPSS, June 15, 2005
Agg = aNc / ( 3pfp )
GCL= mp3|Agg|2 / ( 64p ) = 7.725 +- 0.044eV
GCL = 7.725 +- 0.044eV
GPDG = 7.84 ± 0.556eV
-There are three reactions that allow us to conveniently measure the po decay width.
q ~ mp 2/(2Ep 2)
Total Error 1.4%