Upper limits on resonance contributions to proton-proton elastic scattering in the c.m. mass range 2.05-2.85 GeV/ c2 |
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Authors: | H Rohdjeß M Altmeier F Bauer J Bisplinghoff R Bollmann K Büßer M Busch O Diehl F Dohrmann H P Engelhardt J Ernst P D Eversheim K O Eyser O Felden R Gebel A Groß R Groß-Hardt F Hinterberger R Langkau J Lindlein R Maier F Mosel D Prasuhn P von Rossen N Scheid M Schulz-Rojahn F Schwandt V Schwarz W Scobel H -J Trelle K Ulbrich E Weise A Wellinghausen K Woller R Ziegler |
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Institution: | 1. Helmholtz-Institut für Strahlen- und Kernphysik, Universit?t Bonn, D-53115, Bonn, Germany 2. Institut für Experimentalphysik, Universit?t Hamburg, D-22761, Hamburg, Germany 3. Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany
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Abstract: | Recently published excitation functions in proton-proton (pp) elastic scattering observables in the laboratory energy range 0.5-2.5GeV provide an excellent data base to establish firm
upper limits on the elasticities ηel = Γel/Γtot of possible isovector resonant contributions to the nucleon-nucleon (NN) system. Such contributions have been predicted to arise from dibaryonic states, with c.m. masses between 2.1-2.9GeV/c2, but have not been confirmed experimentally. A method to determine quantitatively the maximum value of ηel compatible with experimental data is presented. We use energy-dependent phase shift fits to the pp data base to model the non-resonant interaction. Based upon the differential cross-section data measured by the EDDA Collaboration
an unbiased statistical test is constructed to obtain upper limits on ηel, that exclude larger values with a 99% confidence level. Results in the c.m. mass range 2.05-2.85GeV/c2 and total widths of 10-100MeV/c2 in the partial waves 1S0, 1D2, 3P0, 3P1, and 3F3 are presented and discussed. |
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Keywords: | 25 40 Cm Elastic proton scattering 13 75 Cs Nucleon-nucleon interactions (including antinucleons deuterons etc ) 14 20 Pt Dibaryons 11 80 Et Partial-wave analysis |
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