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- W44282414 abstract "The π → γγ decay rate is a fundamental prediction of QCD which gives insight into one of its most profound symmetry issues—namely, the Chiral Anomaly. It is this anomalous symmetry-breaking mechanism by which the π → γγ decay channel primarily proceeds, and thus a measure of its rate or partial width, Γγγ , represents a direct probe of the anomaly plus chiral corrections. The PrimEx Collaboration at Jefferson Lab has extracted Γγγ from precision measurements of π photo-production cross sections using their Primakoff components. Measurements were made using 5% Xo nuclear targets of C and Pb with incident photons between 4.9 and 5.5GeV tagged by the Hall B tagger facility. The π decay photons were detected at very forward angles by a specially constructed high resolution hybrid calorimeter (HYCAL). In this presentation, the final result from the PrimEx measurement will be given along with a general overview of the physics, experimental design and setup, detector construction and performance, and data analysis strategies and techniques." @default.
- W44282414 created "2016-06-24" @default.
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- W44282414 date "2007-04-14" @default.
- W44282414 modified "2023-09-26" @default.
- W44282414 title "The $pi^0$ Lifetime: Experimental Probe of the QCD Axial Anomaly" @default.
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