Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session H09: Hadronic Interactions
10:45 AM–12:33 PM,
Sunday, April 14, 2019
Sheraton
Room: Governor's Square 11
Sponsoring
Units:
DNP GHP
Chair: Kenneth Hicks, Ohio University
Abstract: H09.00004 : The Neutral Pion Life Time: Final Result from the PrimEx Experiments*
11:21 AM–11:33 AM
View Presentation Abstract
Presenter:
Ashot Gasparian
(North Carolina Agricultural and Technical State University)
Author:
Ashot Gasparian
(North Carolina Agricultural and Technical State University)
Collaboration:
for the PrimEx Collaboration at JLab
The neutral pion is the lightest strongly interacting particle in Nature. Therefore, the properties of π0 decay are especially sensitive to the underlying fundamental symmetries of quantum chromodynamics (QCD). In particular, the π0 decay width is primarily defined by the chiral anomaly, a fundamental symmetry breaking effect in QCD. Theoretical activities in this domain over the last years resulted in a high precision (1% level) prediction for the π0 decay width. The PrimEx collaboration at Jefferson Lab has developed and performed two new experiments to measure the π0 decay width with high precision using the Primakoff effect. The published result from the first experiment (PrimEx-I) was a factor of two more precise than the PDG accepted average value, and was in a good agreement with the chiral anomaly prediction. The second experiment (PrimEx-II) was performed in 2010 with a goal of 1.4% total uncertainty to address the next-to-leading-order chiral perturbation theory calculations. The final results from the PrimEx experiments will be presented and discussed in this talk.
*NSF MRI award #PHY-0079840, NSF Research Award #PHY-1812421
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