Small x resummations confronted with F_2(x,Q^2) data
Abstract
It has been observed recently that a consistent LO BFKL gluon evolution leads to a steep growth of F_2(x,Q^2) for x -> 0 almost independently of Q^2. We show that current data from the DESY HERA collider are precise enough to finally rule out a pure BFKL behaviour in the accessible small x region. Several attempts have been made by other groups to treat the BFKL type small x resummations instead as additions to the conventional anomalous dimensions of the successful renormalization group ``Altarelli-Parisi'' equations. We demonstrate that all presently available F_2 data, in particular at lower values of Q^2, can not be described using this approach and show that the addition of the still missing NLO gluon resummations are unlikely to improve the agreement with data significantly. Finally we comment on the common reason for the failure of all BFKL inspired methods which result, in general, in too steep x-dependencies as x -> 0.Keywords
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