Abstract
Exclusive production of proton-antiproton pairs by two photon scattering at CM energies between 2.0 GeV and 3.1 GeV has been measured with the TASSO detector at the e+e- storage ring PETRA. The angular distribution is flat within the accepted CM angular range |cos Θ*|≤0.7. The integrated cross section (|cos Θ*|≤0.6) drops from about 4 nb at 2 GeV to less than 0.5 nb above 3 GeV. For the two-photon production of the ηc(2984) and its subsequent decay into proton-antiproton the upper limit Γ(ηc→γγ)·B(η c→pp)
Original language | English (US) |
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Pages (from-to) | 449-453 |
Number of pages | 5 |
Journal | Physics Letters B |
Volume | 130 |
Issue number | 6 |
DOIs | |
State | Published - Nov 3 1983 |
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics