Unified BFKL and Gribov-Lipatov-Altarelli-Parisi description of F{sub 2} data
- Department of Physics, University of Durham, Durham, DH1 3LE (United Kingdom)
We argue that the use of the universal {ital unintegrated} gluon distribution and the k{sub T} (or high energy) factorization theorem provides the natural framework for describing observables at small x. We introduce a coupled pair of evolution equations for the unintegrated gluon distribution and the sea quark distribution which incorporate both the resummed leading ln(1/x) BFKL contributions and the resummed leading ln(Q{sup 2}) GLAP contributions. We solve these unified equations in the perturbative QCD domain using simple parametric forms of the nonperturbative part of the {ital integrated} distributions. With only two (physically motivated) input parameters we find that this k{sub T} factorization approach gives an excellent description of the measurements of F{sub 2}(x,Q{sup 2}) at DESY HERA. In this way the unified evolution equations allow us to determine the gluon and sea quark distributions and, moreover, to see the x domain where the resummed ln(1/x) effects become significant. We use k{sub T} factorization to predict the longitudinal structure function F{sub L}(x,Q{sup 2}) and the charm component of F{sub 2}(x,Q{sup 2}). {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 542751
- Journal Information:
- Physical Review, D, Vol. 56, Issue 7; Other Information: PBD: Oct 1997
- Country of Publication:
- United States
- Language:
- English
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