Search for narrow pbar p resonances in the reaction pbar p>pbar p pi+pi-
A. Buzzo, P. Debevec, D. Drijard, R.A. Eisenstein, C. Evangelista, W., Eyrich, H. Fischer, J. Franz, R. Geyer, N.H. Hamann, P.G. Harris, D.W., Hertzog, S.A. Hughes, T. Johansson, R.T. Jones, K. Kilian, K. Kirsebom, H., Korsmo, M. Lo Vetere, M. Macri, M. Marinelli, M. Moosburger
TL;DR
This study searched for narrow pbar p resonances in pbar p -> pbar p pi+ pi- reactions at CERN-LEAR but found no evidence, setting upper limits on possible resonance production cross sections.
Contribution
The paper provides the first high-statistics search for narrow pbar p resonances in this reaction and establishes upper limits on their production, constraining previous claims.
Findings
No evidence for narrow pbar p resonances was observed.
An upper limit of 200 nb was set for the production cross section of a 2.02 GeV resonance.
The results restrict the existence of certain narrow states in this energy range.
Abstract
The reaction pbar p -> pbar p pi+ pi- has been studied with high statistics at CERN-LEAR with incident pbar momenta from 1.65 to 2.0 GeV/c by the JETSET (PS202) experiment. The aim of this paper is to search for narrow resonances decaying to pbar p. No evidence for such structures is found. In particular, an upper limit for the production of a 2.02 GeV state with a width of Gamma = 20 MeV, having been seen in other hadroproduction experiments, is established. Our results restrict the cross section for such a peak to be below 200 nb at the 95% confidence level.
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