Description: Pomeron- pomeron-2 pi vertices were sought in the reaction pi /sup -/p yields pi /sup -/ pi /sup +/ pi /sup -/p at 205 GeV/c. From a sample of 1 86 of these events, about 2/3 were extracted for which the rapidity ordering of the four outgoing particles makes them candidates for the double-Pomeron exchange process (i.e., the fastest and the slowest particle are respectively a pi /sup -/ and a proton). A separation from single-Pomeron processes was attempted with the help of a rapidity triangle plot. The number of possible double-Pomeron-type events was also estimated from a Regge-propagator fit to the nonhomogeneous distribution of the events within this triangle. The number of such events obtained by either method gives a cross section upper limit of 85 mu b for double-Pomeron exchange, consistent with the predictions of a pion-pole dominance model. (auth)
Date: August 1, 1973
Creator: Chew, D.M.; Abrams, G.S. & Bingham, H.H.
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Partner: UNT Libraries Government Documents Department