Measurement of the two-photon reaction γγ →π+π-π+π- at large values of Q2
- Braunschweig, W
- Gerhards, R
- Kirschfink, FJ
- Martyn, H-U
- Bock, B
- Fischer, HM
- Hartmann, H
- Hartmann, J
- Hilger, E
- Jocksch, A
- Wedemeyer, R
- Foster, B
- Martin, AJ
- Sephton, AJ
- Barreiro, F
- Bernardi, E
- Chwastowski, J
- Eskreys, A
- Gather, K
- Genser, K
- Hultschig, H
- Joos, P
- Kowalski, H
- Ladage, A
- Löhr, B
- Lüke, D
- Mättig, P
- Notz, D
- Pawlak, JM
- Pösnecker, K-U
- Ros, E
- Trines, D
- Walczak, R
- Wolf, G
- Kolanoski, H
- Kracht, T
- Krüger, J
- Lohrmann, E
- Poelz, G
- Zeuner, W
- Binnie, DM
- Hassard, J
- Shulman, J
- Su, D
- Leites, A
- del Peso, J
- Balkwill, C
- Bowler, MG
- Burrows, PN
- Heath, GP
- Ratoff, PN
- Silvester, IM
- Tomalin, IR
- Veitch, ME
- Forden, GE
- Hart, JC
- Saxon, DH
- Brandt, S
- Holder, M
- Labarga, L
- Eisenberg, Y
- Karshon, U
- Mikenberg, G
- Montag, A
- Revel, D
- Ronat, E
- Shapira, A
- Wainer, N
- Yekutieli, G
- Caldwell, A
- Muller, D
- Ritz, S
- Strom, D
- Takashima, M
- Wicklund, E
- Wu, SL
- Zobernig, G
Publication date
September 1988
DOI Publisher
Springer Science and Business Media LLC Journal
Zeitschrift für Physik C Particles and FieldsAbstract
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
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