Measurement of the two-photon reaction γγ →π+π-π+π- at large values of Q2

Journal article

The process γγ→π+π-π+π- has been investigated in reactions of the type e+e-→e+e-π+π-π+π- in the single tag mode. The range of the four momentum squared of one of the virtual photons was 0.28 GeV2/c2≦Q2≦3.6 GeV2/c2, the average being 〈Q2〉=0.92 GeV2/c2; the other photon was quasi real. The reaction is mainly described by the channels γγ→ρ0ρ0 and γγ→4π (phase space), occuring with about equal probability. The Q2-dependence of the cross section is in agreement with the ρ form factor. © 1988 Springer-Verlag.

Authors: Braunschweig, W; Gerhards, R; Kirschfink, F; Martyn, H; Bock, B

• Publisher: Springer-Verlag
• Journal: Zeitschrift für Physik C Particles and Fields
• Volume: 41
• Issue: 3
• Pages: 353-357
• Publication date: 1988-09-01
• DOI: 10.1007/BF01585619
• EISSN: 1434-6052
• ISSN: 0170-9739
• Language: English