Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-08-14
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 5 tables, a talk given by B.Blok at the small x conference at Columpari, Crete, 2008
Scientific paper
We find, within the pQCD dipole model for DIS processes, a rapid increase with energy of the scale of parton momenta in the current fragmentation region in the limit $s\to \infty$ and fixed $Q^2$ . We explain the equivalence between the dispersion representation over $Q^2$ for LT pQCD zero angle amplitude of $\gamma^*+T\to \gamma^*+T$ scattering at large energies and the $k_t$ factorization, and use it to evaluate the scales of the hard processes in the current fragmentation region. We derive within the black disc (BD) regime the modified Gribov formula for the total cross-section of the DIS. We evaluate the coherence length of the processes relevant for the BD regime and find that it increases with energy as $\sim s^{0.6}$ i.e. significantly slower than in the parton model ($1/2m_Nx$ - the Ioffe length) as well as in pQCD. In the BD regime we estimate the gluon densities, local in the coordinate space, and find that they do not decrease with the energy. We discuss briefly how the new pQCD phenomena may reveal itself in the proton-proton collisions at LHC
Blok Boris
Frankfurt Leonid L.
Strikman Mark
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