Abstract
The total cross section for γγ→hadrons was measured as a function of the invariant massW of the system (1.25 to 4.25 GeV) at thee + 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 〈q 2〉 is −0.005 GeV2, the rmsW resolution is 100–250 MeV. The data on the mean charged multiplicity 〈n C 〉 are well described by the function 〈n C 〉=(1.62 ±0.37)+(1.83±0.45)·ln(W(GeV)). TheW dependence of the total cross section is consistent with the theoretical prediction σ(nb)=240+270/W(GeV).
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Baru, S.E., Beilin, M.V., Blinov, A.E. et al. Total cross section of two-photon production of hadrons. Z. Phys. C - Particles and Fields 53, 219–224 (1992). https://doi.org/10.1007/BF01597557
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DOI: https://doi.org/10.1007/BF01597557