The vertex 3 has been investigated in the reaction of pion pair production by pions in the nuclear Coulomb field, -+(Z,A)-+0+(Z,A), in the region of low-invariant-mass -0 pairs. The experiment has been carried out in the 40-GeV pion beam of the IHEP accelerator (Serpukhov) with the SIGMA spectrometer. We have measured for the first time the cross section of the reaction in the region of momentum transfer squared q2<2×10-3 (GeV/c)2, /Z2=1.630.230.13 nb, and the 3 coupling constant F3=12.90.90.5 GeV-3, where the first (second) error is statistical (systematic). The obtained result agrees with the calculations based on the Wess-Zumino-Witten effective Lagrangian. The hypothesis of chiral anomalies and the color-SU(3) quark symmetry are confirmed.

Investigation of the chiral anomaly γ→3π in pion pair production by pion in the nuclear Coulomb field / 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 D. - ISSN 0556-2821. - 36:1(1987), pp. 21-29.

Investigation of the chiral anomaly γ→3π in pion pair production by pion in the nuclear Coulomb field

F. Palombo
Ultimo
1987

Abstract

The vertex 3 has been investigated in the reaction of pion pair production by pions in the nuclear Coulomb field, -+(Z,A)-+0+(Z,A), in the region of low-invariant-mass -0 pairs. The experiment has been carried out in the 40-GeV pion beam of the IHEP accelerator (Serpukhov) with the SIGMA spectrometer. We have measured for the first time the cross section of the reaction in the region of momentum transfer squared q2<2×10-3 (GeV/c)2, /Z2=1.630.230.13 nb, and the 3 coupling constant F3=12.90.90.5 GeV-3, where the first (second) error is statistical (systematic). The obtained result agrees with the calculations based on the Wess-Zumino-Witten effective Lagrangian. The hypothesis of chiral anomalies and the color-SU(3) quark symmetry are confirmed.
Settore FIS/04 - Fisica Nucleare e Subnucleare
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/182251
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