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Modelling the nucleon wave function from soft and hard processes

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Zeitschrift für Physik A Hadrons and Nuclei

Abstract

Current light-cone wave functions for the nucleon are unsatisfactory since they are in conflict with the data of the nucleon’s Dirac form factor at large momentum transfer. Therefore, we attempt a determination of a new wave function respecting theoretical ideas on its parameterization and satisfying the following constraints: It should provide a soft overlap contribution to the proton’s form factor in agreement with data; it should be consistent with current parameterizations of the valence quark distribution functions and lastly it should provide an acceptable value for theJ/ψ → N N decay width. The latter process is calculated within the modified perturbative approach to hard exclusive reactions. A simultaneous fit to the three sets of data leads to a wave function whosex-dependent part, the distribution amplitude, shows the same type of asymmetry as those distribution amplitudes constrained by QCD sum rules. The assymetry is however much more moderate as in those amplitudes. Our distribution amplitude resembles the asymptotic one in shape but the position of the maximum is somewhat shifted.

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Authors and Affiliations

  1. Fachbereich Physik, Universität Wuppertal, D-42097, Wuppertal, Germany

    J. Bolz & P. Kroll

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  1. J. Bolz
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  2. P. Kroll
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Correspondence to J. Bolz.

Additional information

Communicated by W. Weise

Supported by the Deutsche Forschungsgemeinschaft

This article was processed by the authors using the LATEX style filepljour2 from Springer-Verlag.

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Bolz, J., Kroll, P. Modelling the nucleon wave function from soft and hard processes. Z. Physik A - Hadrons and Nuclei 356, 327–338 (1996). https://doi.org/10.1007/BF02769236

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  • DOI: https://doi.org/10.1007/BF02769236

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