Soft and hard Pomeron in the structure function of the proton at low x and low Q^2 |
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Authors: | U D'Alesio A Metz HJ Pirner |
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Institution: | Institut für Theoretische Physik, Universit?t Heidelberg, Philosophenweg 19, D-69120 Heidelberg, Germany, DE
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Abstract: | We study inclusive electroproduction on the proton at low x and low using a soft and a hard Pomeron. The contribution of the soft Pomeron is based on the Stochastic Vacuum Model, in which a
nonperturbative dipole-dipole cross section can be calculated by means of a gauge invariant gluon field strength correlator.
To model the hard Pomeron exchange we phenomenologically extend the leading order evolution of a power-behaved structure function,
, proposed by López and Ynduráin. This extension allows to consider both the case and the region of higher on the basis of the same parametrization. A good simultaneous fit to the data on and on the cross section of real photoproduction is obtained for . With four parameters we achieve a for 222 data points. In addition, we use our model of the inclusive interaction to compute the longitudinal structure function .
Received: 6 December 1998 / Revised version: 19 April 1999 / Published online: 18 June 1999 |
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