English

New data and the hard pomeron

High Energy Physics - Phenomenology 2009-11-07 v2 High Energy Physics - Experiment

Abstract

New structure-function data are in excellent agreement with the existence of a hard pomeron, with intercept about 1.4. It gives a very economical description of the data. Having fixed 2 parameters from the data for the real-photon cross section σγp\sigma^{\gamma p}, we need just 5 further parameters to fit the data for F2(x,Q2)F_2(x,Q^2) with x0.001x\leq 0.001. The available data range from Q2=0.045Q^2=0.045 to 35 GeV2^2. With guesses consistent with dimensional counting for the xx dependences of our three separate terms, the fit extends well to larger xx and to Q2=5000Q^2=5000 GeV2^2. With no additional parameters, it gives a good description of data for the charm structure function F2c(x,Q2)F_2^c(x,Q^2) from Q2=0Q^2=0 to 130 GeV2^2. The two pomerons also give a good description of both the WW and the tt dependence of γpJ/ψp\gamma p\to J/\psi p.

Keywords

Cite

@article{arxiv.hep-ph/0105088,
  title  = {New data and the hard pomeron},
  author = {A Donnachie and P V Landshoff},
  journal= {arXiv preprint arXiv:hep-ph/0105088},
  year   = {2009}
}

Comments

11 pages, plain tex, with 10 figures embedded using epsf. (Spurious figure removed.)

R2 v1 2026-07-22T13:33:51.123Z