Axial anomaly and the precise value of the $π^0 \to 2 γ$ decay width

Details Axial anomaly and the precise value of the $π^0 \to 2 γ$ decay width Axial anomaly and the precise value of the $π^0 \to 2 γ$ decay width

2007-01-10

arxiv.org/abs/hep-ph/0701077v2

Phys.Lett.B647:389-393,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, few misprints are corrected

Scientific paper

10.1016/j.physletb.2007.02.021

The anomaly in the vacuum expectation value of the product of axial and two vector currents (AVV) in QCD is investigated. The goal is to determine from its value the $\pi^0 \to 2 \gamma$ decay width with high precision. The sum rule for AVV formfactor is studied. The difference $f_{\pi^0} - f_{\pi^+}$ caused by strong interaction is calculated and appears to be small. The $\pi^0 - \eta$ mixing is accounted. The $\pi^0 \to 2 \gamma$ decay width determined theoretically from the axial anomaly is found to be $\Gamma(\pi^0 \to 2 \gamma) = 7.93 eV$ with an error $\sim 1.5%$. The measurement of the $\pi^0 \to 2 \gamma$ decay width at the same level of accuracy would allow one to achieve a high precision test of QCD.

Affiliated with

Also associated with

No associations

Rating

Axial anomaly and the precise value of the $π^0 \to 2 γ$ decay width does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Axial anomaly and the precise value of the $π^0 \to 2 γ$ decay width, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Axial anomaly and the precise value of the $π^0 \to 2 γ$ decay width will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-447772