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ISSN - 01709739, Zeitschrift f�r Physik C-Particles and Fields, 1992, vol. 53, p. 219-224

Total cross section of two-photon production of hadrons

Baru S. E., Beilin M. V., Blinov A. E., Blinov V. E., Bondar A. E., Bukin A. D., Eidelman S. I., Eidelman Yu I., Groshev V. R., Kiselev V. A., Klimenko S. G., Kolachev G. M., Mishnev S. I., Onuchin A. P., Panin V. S., Petrov V. V., Protopopov I. Ya, Shamov A. G., Sidorov V. A., Skovpen Yu I., Skrinsky A. N., Tayursky V. A., Telnov V. I., Temnykh A. B., Tikhonov Yu A., Tumaikin G. M., Undrus A. E., Vorobiov A. I., Zhilich V. N., Zholents A. A.

The total cross section for γγ→hadrons was measured as a function of the invariant mass W of the system (1.25 to 4.25 GeV) at the e+e--collider VEPP-4 with the detector MD-1. For the first time the data were obtained by detecting both scattered leptons with almost zero emission angles. The mean squared four momentum transfer 〈q2〉 is -0.005 GeV2, the rms W resolution is 100-250 MeV. The data on the mean charged multiplicity 〈nC〉 are well described by the function 〈nC〉=(1.62 ±0.37)+(1.83±0.45)·ln(W(GeV)). The W dependence of the total cross section is consistent with the theoretical prediction σ(nb)=240+270/W(GeV). © 1992 Springer-Verlag.