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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.
81V05 Strong interaction, including quantum chromodynamics
81V35 Nuclear physics
Cuba; GSL
Full Text: DOI
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