Small x resummations confronted with F2( x, Q2) data

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....

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Published in:Physics letters. B 1997-04, Vol.397 (3), p.296-304
Main Authors: Bojak, I, Ernst, M
Format: Article
Language:English
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Summary: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 the presently known NLO (two-loop consistent) small x resummations. Finally we comment on the common reason for the failure of these BFKL inspired methods which result, in general, in too steep >x-dependencies as x → 0.
ISSN:0370-2693
1873-2445
DOI:10.1016/S0370-2693(97)00177-9