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Ioffe times in DIS from a dipole model fit. (English) Zbl 1271.81175
Summary: We present a study of Ioffe times in deep inelastic electron-proton scattering. We deduce ’experimental’ Ioffe-time distributions from the small-$$x$$ HERA data as described by a particular colour-dipole-model fit. We show distributions for three representative $$\gamma^*p$$ c.m. energies W and various values of the photon virtuality $$Q^2$$. These distributions are rather broad for transversely and very narrow for longitudinally polarised virtual photons. The Ioffe times for $$W$$ = 150 GeV, for example, range from around $$10^3$$ fm for $$Q^2$$ = 1 GeV$${}^2$$ to around 10 fm for $$Q^2$$ = 100 GeV$${}^2$$. Based on our results we discuss consequences for the limitations of applicability of the dipole picture.
##### MSC:
 81V05 Strong interaction, including quantum chromodynamics 81V35 Nuclear physics
##### Keywords:
deep inelastic scattering; phenomenological models; QCD
Cuba; GSL
Full Text:
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