Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-07-25
Phys.Rev. D56 (1997) 7291-7298
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, LaTex, 11 figures, Submitted to Physical Review
Scientific paper
10.1103/PhysRevD.56.7291
The strikingly different high energy behaviours of real photoabsorption cross-sections with Q^2 = 0 and the low x proton structure function at large Q^2 are studied from a laboratory frame viewpoint, in which the x and Q^2 dependence reflects the space-time structure of the interaction. This is done using a simple model which incorporates hadron dominance, but attributes the striking enhancement observed at HERA at very low x and high Q^2 to contributions from heavy long-lived fluctuations of the incoming photon. Earlier published predictions of the model for the then unknown behaviour of the structure function at small x and intermediate Q^2 are shown to be strikingly confirmed by recent experimental data. A simultaneous analysis of real photoabsorption data and structure function data for 0 <= x < 0.1 and 0 <= Q^2 <= 15 GeV^2 is then reported. An excellent fit is obtained, with all parameters in the restricted ranges allowed by other physical requirements.
Kerley G.
Shaw Gargi
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