Ioffe Times in DIS from a Dipole Model Fit

Details Ioffe Times in DIS from a Dipole Model Fit Ioffe Times in DIS from a Dipole Model Fit

2009-09-13

arxiv.org/abs/0909.2434v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages

Scientific paper

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*-proton 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 1000 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.

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