Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-07-14
JHEP 1011:051,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
31 pages, 9 figures. More references and several few clarifying remarks added. Fits to the most recent H1/ZEUS data unchanged
Scientific paper
10.1007/JHEP11(2010)051
The AdS/CFT correspondence in principle gives a new approach to deep inelastic scattering as formulated by Polchinski and Strassler. Subsequently Brower, Polchinski, Strassler and Tan (BPST) computed the strong coupling kernel for the vacuum (or Pomeron) contribution to total cross sections. By identifying deep inelastic scattering with virtual photon total cross section, this allows a self consistent description at small-$x$ where the dominant contribution is the vacuum exchange process. Here we formulate this contribution and compare it with HERA small-$x$ DIS scattering data. We find that the BPST kernel along with a very simple local approximation to the proton and current "wave functions" gives a remarkably good fit not only at large $Q^2$ dominated by conformal symmetry but also extends to small $Q^2$, supplemented by a hard-wall cut-off of the AdS in the IR. We suggest that this is a useful phenomenological parametrization with implications for other diffractive processes, such as double diffractive Higgs production.
Brower Richard C.
Djuric Marko
Sarcevic Ina
Tan Chung-I
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