Pion pair production in photon-photon interactions

• DOI: 10.1007/bf01421755
• Publication Date: 2005-04-11T21:08:04Z
• Authors: Ch. Berger; A. Deuter; H. Genzel; W. Lackas; J. Pielorz; F. Raupach; W. Wagner; A. Llovning; E. Lillestöl; J. Bürger; L. Criegee; F. Ferrarotto; G. Franke; M. Gaspero; Ch. Gerke; G. Knies; B. Lewendel; J. Meyer; U. Michelsen; K. H. Pape; B. Stella; U. Timm; G. G. Winter; M. Zachara; W. Zimmermann; P. J. Bussey; S. L. Cartwright; J. B. Dainton; B. T. King; C. Raine; J. M. Scarr; I. O. Skillicorn; K. M. Smith; J. C. Thomson; O. Achterberg; V. Blobel; D. Burkart; K. Diehlmann; M. Feindt; H. Kapitza; B. Koppitz; M. Krüger; M. Poppe; H. Spitzer; R. Staa; C. Y. Chang; R. G. Glasser; R. G. Kellogg; S. J. Maxfield; R. O. Polvado; B. Sechi-Zorn; J. A. Skard; A. Skuja; A. J. Tylka; G. E. Welch; G. T. Zorn; F. Almeida; A. Bäcker; F. Barreiro; S. Brandt; K. Derikum; C. Grupen; H. J. Meyer; H. Müller; B. Neumann; M. Rost; K. Stupperich; G. Zech; G. Alexander; G. Bella; Y. Gnat; J. Grunhaus; H. Junge; K. Kraski; C. Maxeiner; H. Maxeiner; H. Meyer; D. Schmidt
• Keywords: Pair production; Particle identification

The processγγπ+π− has been measured with complete particle identification. Cross-sections are presented from near threshold up to the region of thef(1270). In the mass range 0.5–0.7 GeV, crosssections are lower than the Born term predictions and show no evidence for an e(600). The two-photon width of thef(1270) is found to be in agreement with previous results.