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The missing odderon

  • Theoretical Physics
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Abstract.

In contrast to theoretical expectations, experimental results at \(\sqrt{s} = 200\) GeV for the reaction γp → π0 X show no evidence for odderon exchange. The upper limit on the cross section is an order of magnitude smaller than the theoretical estimate. It is argued that chiral symmetry leads to a large suppression, taking the theoretical estimates well below the data. Two additional arguments are presented which may decrease the theoretical estimate further. The calculations are more sensitive to the assumptions made in evaluating the hadronic scattering amplitude than in the processes considered previously and lattice gauge calculations indicate that the odderon intercept may be appreciably lower than usually assumed. These two latter effects are particularly relevant for the reactions γp → \(f_2^0(1270) X\) and γp → \(a_2^0(1320) X\) for which the data upper limits are also below the theoretical predictions, but not so dramatically as for γp → π0 X.

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Authors and Affiliations

  1. University of Manchester, School of Physics and Astronomy, M13 9PL, Manchester, U.K.

    A. Donnachie

  2. Universität Heidelberg, Institut für Theoretische Physik, Philosophenweg 16, 69120, Heidelberg, Germany

    H. G. Dosch & O. Nachtmann

Authors
  1. A. Donnachie
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  2. H. G. Dosch
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  3. O. Nachtmann
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Correspondence to A. Donnachie.

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Donnachie, A., Dosch, H.G. & Nachtmann, O. The missing odderon. Eur. Phys. J. C 45, 771–776 (2006). https://doi.org/10.1140/epjc/s2005-02438-y

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  • DOI: https://doi.org/10.1140/epjc/s2005-02438-y

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