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Towards an unambiguous determination of the structure of the hadronic neutral current
Phys. Rev. D 34, 751 – Published 1 August, 1986
DOI: https://doi.org/10.1103/PhysRevD.34.751
Abstract
The problem of removing the ambiguities from a model-independent determination of the couplings of the hadronic neutral current is considered. It is shown that a residual ambiguity, difficult to be removed, affects previous determinations, due to both the experimental uncertainties and the use of multiparameter numerical best fits. Starting from a recent updated analysis of the deep-inelastic scattering data, inclusive of radiative corrections, and making use of an analytic approach to the problem, it is seen that the comparison with an analysis of the single-pion production data at intermediate energies, not only (i) leads to discarding, with better evidence than previously, the so-called dominantly isoscalar solution, but also (ii) allows the residual ambiguity to be solved. The unique solution so obtained represents a substantial improvement in the determination of the couplings, in particular, as far as the isoscalar piece of the hadronic neutral current is concerned, with a better agreement than in the past with the standard model.
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