The BFKL-Regge factorization and F2b , F2c , FL at HERA: physics implications of nodal properties of the BFKL eigenfunctions |
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Authors: | K Fiore N N Nikolaev and V R Zoller |
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Abstract: | The asymptotic freedom is known to split the leading-log BFKL pomeron into a series of isolated poles in the complex angular
momentum plane. One of our earlier findings was that the subleading hard BFKL exchanges decouple from such experimentally
important observables as small-x charm F
2
c
, beauty F
2
b
and the longitudinal structure functions of the proton at moderately large Q
2. For instance, we predicted precocious BFKL asymptotics of F
2
c
(x, Q
2) with intercept of the rightmost BFKL pole a
IP(0) − 1 = ΔIP ≈ 0.4. On the other hand, the small-x open beauty photo- and electro-production probes the vacuum exchange for much smaller color dipoles which entails significant
subleading vacuum pole corrections to the small-x behavior. In view of the accumulation of the experimental data on small-x
F
2
c
and F
2
b
we extend our 1999 predictions to the kinematical domain covered by new HERA measurements. Our parameter-free results agree
well with the determination of F
2
c
, F
L
and published H1 results F
2
b
on but slightly overshoot the very recent (2008, preliminary) H1 results on F
2
b
. |
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Keywords: | |
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