We present the results of an experimental investigation of the production in the nuclear Coulomb field of low-invariant-mass pions pairs by the reaction -Z'-0Z at 40 GeV. We have obtained for the first time the experimental value of the '3 coupling constant F3(0)=13.0±0.9±1.3 GeV-3, where the first (second) error is statistical (systematic). This result is in agreement with calculations based on the theory of chiral anomalies.
Experimental measurement of the γ→3π coupling constant / Y. Antipov, V. Batarin, V. Bessubov, N. Budanov, Y. Gorin, S. Denisov, S. Klimenko, I. Kotov, A. Lebedev, A. Petrukhin, S. Polovnikov, D. Stoyanova, Y. Gornushkin, P. Kulinich, G. Micelmacher, A. Olshevski, J. Sedlak, V. Travkin, R. Pirtzkhalava, V. Roinishvili, F. Palombo. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 56:8(1986), pp. 796-799. [10.1103/PhysRevLett.56.796]
Experimental measurement of the γ→3π coupling constant
F. PalomboUltimo
1986
Abstract
We present the results of an experimental investigation of the production in the nuclear Coulomb field of low-invariant-mass pions pairs by the reaction -Z'-0Z at 40 GeV. We have obtained for the first time the experimental value of the '3 coupling constant F3(0)=13.0±0.9±1.3 GeV-3, where the first (second) error is statistical (systematic). This result is in agreement with calculations based on the theory of chiral anomalies.
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