Elsevier

Nuclear Physics B

Volume 16, Issue 2, 15 March 1970, Pages 287-320
Nuclear Physics B

The reaction πp → pπ+ππ at 13 and 20 GeV/c

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Abstract

Data from the reaction πp → pπ+ππ at 13 and 20 GeV/c are analyzed and compared with the predictions of the Wolf calculation of the one-pion-exchange model (OPEM). We observe strong production of the N∗++(1236) isobar and ϱo meson as well as some fo meson production. In the pπ system, there is evidence of the N∗o(1236) and the N∗o(1688) isobars and indications of N∗o(1518) and Roper resonance production. The pπ+π system also exhibits enhancements in the vicinity of 1.5 and 1.7 GeV. There is a strong, unstructured A-enhancement in the 3π mass spectrum which decays preferentially through the πϱ channel. A prominent peak in the region of the π(1640) is also seen in this spectrum. The OPEM is able to reproduce many of the salient features of the data with the notable exception of the 3π enhancements in the A and π(1640) regions.

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    Work supported by the U.S. Atomic Energy Commission.

    ∗∗

    Present Address: University of Illinois, Urbana, Illinois.

    ∗∗∗

    Present address: Purdue University, Lafayette, Indiana.

    Present Address: Salem State College, Salem, Massachusetts.

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