An Experimental study of the process gamma gamma ---> pi+ pi-

Using the CELLO detector, we have measured cross sections for the processγγ→π+π− in the mass range 0.75–1.9 GeV/c2. A partial wave fit to the data indicates the presence of a sizeableS-wave amplitude with signs of resonant behaviour. Values for the γγ width of thef2(1270) are given, showing the model-dependence of this quantity. At higher dipion masses, the model of Brodsky and Lepage is found to give an order of magnitude description of the data.

electron positron: colliding beams
colliding beams: electron positron
exchange: two-photon
two-photon: exchange
photon photon: interaction
interaction: photon photon
pi: pair production
pair production: pi
f2(1270): width
mass spectrum: (pi+ pi-)

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