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VOLUME 61 (1995) | ISSUE 4 | PAGE 247
Did the ARGUS group discover a new physical phenomenon in the reaction γγ→ ρ0φ?
The factorization model at high energies gives the estimate for the γγ—>p φ reaction cross section in the Wyy energy region between 11.5 and 18.4 GeV: σ(γγ-^>ρ0φ)= 1.2-2.4 nb. A comparison of this estimate with the recent ARGUS data, o(yy->pV)=0.16±0.16 nb for 3.25=sWrr=£3.5 GeV, shows that between 3.5 and 11.5 GeV the γγ-^>ρ°φ reaction cross section must increase an order of magnitude. A similar increase would be a real challenge for our current knowledge about the dynamics of quasi-two-body reactions and would also signify that in the reaction ÕÕ-^Ò°Æ at W ÕÕ^ÿ.5 GeV one is up against a new unknown phenomenon.© 1995 American Institute of Physics.