[Primex2] DNP abstract

[Yang Zhang]

Dear All,

Please find my DNP abstract below. I also include a link with a word file
for the abstract. Please let me know if you have any comment.

DNPabstract_yang.docx
<https://www.jlab.org/primex/weekly_meetings/primexII/slides_2015_06_26/DNPabstract_yang.docx>

Best

Yang

*Measurement of Neutral π0 Lifetime*



Yang Zhang

Duke University

(For the PrimEx collaboration)



QCD chiral anomaly is the dominant component of π0®gg decay. A prediction
of π0 lifetime can be used as a test of QCD at confinement scale. Recent
theoretical activities have shown high precision (1% level) calculations of
the decay width of the π0 decay into two photons. The experiment
measurement with comparable precision will be critical to test these
predictions. At Jefferson Lab, the PrimEx collaboration has performed high
precision experiments to measure the π0 life time using Primakoff effect.
The first experiment published its result with 2.8% total uncertainty in
the π0 decay width. The second experiment was carried out in Fall 2010 with
the final goal of 1.4% precision. The preliminary result of this experiment
will be presented.
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