Diffraction dissociation of neutrons in the reaction dp → pppπ− at 25 GeV/c |
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Authors: | J.W. Cooper A.A. Seidl J.C. Vander Velde |
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Affiliation: | The University of Michigan, Ann Arbor, Michigan 48104, USA |
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Abstract: | We observe the reaction dp → pspec (pπ?)p in a bubble chamber exposure at 25 GeV/c incident deuteron momentum. The (pπ?) system with invariant mass below 2.0 GeV is interpreted as neutron diffraction dissociation. The (pπ?) mass spectra show little if any direct evidence of N1 production. The decay angular distributions and the momentum transfer distributions of the (pπ?) system suggest a smooth increase in contributions from higher partial waves with increased mass or momentum transfer. A simple partial-wave analysis shows a P11 contribution below 1.3 GeV for small ?t′ and a dominant D13 contribution elsewhere. Both the P11 and D13 amplitudes peak far below the N1(1470) and N1(1520) resonances. We also find evidence for the charge-exchange reaction np → p(pπ?). In this process the (pπ?) system shows evidence for Δo(1236) and N1(1520) production. |
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