Axial anomaly and the precise value of the $π^0 \to 2 γ$ decay width
| dc.creator | Ioffe, B. L. | |
| dc.creator | Oganesian, A. G. | |
| dc.date | 2007-01-10 | |
| dc.date | 2007-03-05 | |
| dc.date.accessioned | 2026-07-07T11:02:34Z | |
| dc.date.available | 2026-07-07T11:02:34Z | |
| dc.description | 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 $π^0 \to 2 γ$ decay width with high precision. The sum rule for AVV formfactor is studied. The difference $f_{π^0} - f_{π^+}$ caused by strong interaction is calculated and appears to be small. The $π^0 - η$ mixing is accounted. The $π^0 \to 2 γ$ decay width determined theoretically from the axial anomaly is found to be $Γ(π^0 \to 2 γ) = 7.93 eV$ with an error $\sim 1.5%$. The measurement of the $π^0 \to 2 γ$ decay width at the same level of accuracy would allow one to achieve a high precision test of QCD. | |
| dc.description | 8 pages, few misprints are corrected | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0701077 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0701077 | |
| dc.identifier | Phys.Lett.B647:389-393,2007 | |
| dc.identifier | doi:10.1016/j.physletb.2007.02.021 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/188292 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Axial anomaly and the precise value of the $π^0 \to 2 γ$ decay width | |
| dc.type | text |