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The range of the four momentum squared of one of the virtual photons was 0.28 GeV2/c2\u2266Q2\u22663.6 GeV2/c2, the average being \u3008Q2\u3009=0.92 GeV2/c2; the other photon was quasi real. The reaction is mainly described by the channels \u03b3\u03b3\u2192\u03c10\u03c10 and \u03b3\u03b3\u21924\u03c0 (phase space), occuring with about equal probability. TheQ2-dependence of the cross section is in agreement with the \u03c1 form factor.","access_urls":{"links":{"csv":"https://www.hepdata.net/download/submission/ins250570/1/csv","json":"https://www.hepdata.net/download/submission/ins250570/1/json","root":"https://www.hepdata.net/download/submission/ins250570/1/root","yaml":"https://www.hepdata.net/download/submission/ins250570/1/yaml","yoda":"https://www.hepdata.net/download/submission/ins250570/1/yoda"}},"analyses":[],"arxiv_id":null,"authors":["Braunschweig, W.","Gerhards, R.","Kirschfink, F.J.","Martyn, H.U.","Rosskamp, P.","Bock, B.","Eisenmann, J.","Fischer, H.M.","Hartmann, H.","Hilger, E."],"collaborations":["TASSO"],"control_number":"15557","creation_date":"1987-01-01","data":[{"abstract":"Data read from graph.. Additional overall systematic error 25%.\n","access_urls":{"links":{"csv":"https://www.hepdata.net/download/table/ins250570/Table 1/csv","json":"https://www.hepdata.net/download/table/ins250570/Table 1/json","root":"https://www.hepdata.net/download/table/ins250570/Table 1/root","yaml":"https://www.hepdata.net/download/table/ins250570/Table 1/yaml","yoda":"https://www.hepdata.net/download/table/ins250570/Table 1/yoda"}},"authors":null,"collaborations":["TASSO"],"control_number":"15581","creation_date":"1987-01-01","data_keywords":{"cmenergies":[{"gte":1.0,"lte":2.6}],"observables":["SIG"],"phrases":["Photoproduction","Integrated Cross Section","Exclusive","Two-Photon","Cross Section"],"reactions":["GAMMA GAMMA --> PI+ PI- PI+ PI-"]},"date":"01 Jan 1987","doc_type":"datatable","doi":"10.17182/hepdata.15557.v1/t1","first_author":{"affiliation":"Aachen, Tech. 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