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Upper limits on resonance contributions to proton-proton elastic scattering in the c.m. mass range 2.05-2.85 GeV/ c2

  • Hadron Physics
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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 1 S 0, 1 D 2, 3 P 0, 3 P 1, and 3 F 3 are presented and discussed.

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Authors and Affiliations

  1. Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, D-53115, Bonn, Germany

    H. Rohdjeß, M. Altmeier, J. Bisplinghoff, M. Busch, O. Diehl, H. P. Engelhardt, J. Ernst, P. D. Eversheim, R. Groß-Hardt, F. Hinterberger, F. Mosel, N. Scheid, M. Schulz-Rojahn, F. Schwandt, V. Schwarz, H. -J. Trelle, K. Ulbrich, E. Weise & R. Ziegler

  2. Institut für Experimentalphysik, Universität Hamburg, D-22761, Hamburg, Germany

    F. Bauer, R. Bollmann, K. Büßer, F. Dohrmann, K. O. Eyser, A. Groß, R. Langkau, J. Lindlein, W. Scobel, A. Wellinghausen & K. Woller

  3. Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany

    O. Felden, R. Gebel, R. Maier, D. Prasuhn & P. von Rossen

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  1. H. Rohdjeß
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  12. P. D. Eversheim
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Corresponding author

Correspondence to F. Hinterberger.

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M. Garçon

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Rohdjeß, H., Altmeier, M., Bauer, F. et al. Upper limits on resonance contributions to proton-proton elastic scattering in the c.m. mass range 2.05-2.85 GeV/ c2 . Eur. Phys. J. A 28, 115–124 (2006). https://doi.org/10.1140/epja/i2006-10025-9

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