QCD, conformal invariance and the two pomerons

Details QCD, conformal invariance and the two pomerons QCD, conformal invariance and the two pomerons

1998-11-19

arxiv.org/abs/hep-ph/9811400v2

Eur.Phys.J.C9:479-485,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

Discussion developped, conclusions unchanged; version to appear in Eur.Phys.J. C

Scientific paper

10.1007/s100529900063

Using the solution of the BFKL equation including the leading and subleading conformal spin components, we show how the conformal invariance underlying the leading log 1/x expansion of perturbative QCD leads to elastic amplitudes described by two effective Pomeron singularities. One Pomeron is the well-known "hard" BFKL leading singularity while the new one appears from a shift of the higher conformal spin BFKL singularities from subleading to leading position. This new effective singularity is compatible with the "soft" Pomeron and thus, together with the "hard" Pomeron, meets at large Q^2 the "double Pomeron" solution which has been recently conjectured by Donnachie and Landshoff.

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