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

Yu. M. Antipov, V. A. Batarin, V. A. Bessubov, N. P. Budanov, Yu. P. Gorin, S. P. Denisov, S. V. Klimenko, I. V. Kotov, A. A. Lebedev, A. I. Petrukhin, S. A. Polovnikov, D. A. Stoyanova, Yu. A. Gornushkin, P. A. Kulinich, G. V. Micelmacher, A. G. Olshevski, J. Sedlak, V. I. Travkin, R. V. Pirtzkhalava, V. N. Roinishvili, and F. Palombo
Phys. Rev. D 36, 21 – Published 1 July 1987
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Abstract

The vertex γ→3π has been investigated in the reaction of pion pair production by pions in the nuclear Coulomb field, π+(Z,A)→π+π0+(Z,A), in the region of low-invariant-mass ππ0 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<2×103 (GeV/c)2, σ/Z2=1.63±0.23±0.13 nb, and the γ→3π coupling constant F3π=12.9±0.9±0.5 GeV3, 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.

  • Received 29 September 1986

DOI:https://doi.org/10.1103/PhysRevD.36.21

©1987 American Physical Society

Authors & Affiliations

Yu. M. Antipov, V. A. Batarin, V. A. Bessubov, N. P. Budanov, Yu. P. Gorin, S. P. Denisov, S. V. Klimenko, I. V. Kotov, A. A. Lebedev, A. I. Petrukhin, S. A. Polovnikov, and D. A. Stoyanova

  • Institute of High Energy Physics, Serpukhov, USSR

Yu. A. Gornushkin, P. A. Kulinich, G. V. Micelmacher, A. G. Olshevski, J. Sedlak, and V. I. Travkin

  • Joint Institute for Nuclear Research, Dubna, USSR

R. V. Pirtzkhalava and V. N. Roinishvili

  • Institute of Physics of the Georgian Academy of Sciences, Tbilisi, USSR

F. Palombo

  • Dipartimento di Fisica dell’Università and Istituto Nazionale di Física Nucleare, Milan, Italy

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Vol. 36, Iss. 1 — 1 July 1987

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