Beauty, charm, and F{sub L} at HERA: New data vs. Early predictions

Journal Article · Thu Apr 15 00:00:00 EDT 2010 · Physics of Atomic Nuclei

DOI:https://doi.org/10.1134/S1063778810040137· OSTI ID:21426737

Nikolaev, N N ^[1]

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1. Forschungszentrum Juelich, Institut fuer Kernphysik (Germany)

One of the well-known effects of the asymptotic freedom is splitting of the leading-log BFKL pomeron into a series of isolated poles in complex angular momentum plane. Following our earlier works we explore the phenomenological consequences of the emerging BFKL-Regge factorized expansion for the small-x charm (F{sub 2}{sup c}) and beauty (F{sub 2}{sup b}) structure functions of the proton. As we found earlier, the colordipole approach to the BFKL dynamics predicts uniquely decoupling of subleading hard BFKL exchanges from F{sub 2}{sup c} at moderately large Q{sup 2}. We predicted precocious BFKL asymptotics of F{sub 2}{sup c} (x,Q{sup 2}) with intercept of the rightmost BFKL pole {alpha}{sub P}(0) - 1 = {Delta}{sub P} {approx} 0.4. High-energy open beauty photo- and electroproduction probes the vacuum exchange at much smaller distances and detects significant corrections to the BFKL asymptotics coming from the subleading vacuum poles. In view of the accumulation of the experimental data on small -xF{sub 2}{sup c} and F{sub 2}{sup b} we extended our early predictions to the kinematical domain covered by new HERA measurements. Our structure functions obtained in 1999 agree well with the determination of both F{sub 2}{sup c} and F{sub 2}{sup b} by the H1 published in 2006 but contradict very recent (2008, preliminary)H1 results on F{sub 2}{sup b}. We present also comparison of our early predictions for the longitudinal structure function F{sub L} with recent H1 data (2008) taken at very low Bjorken x. We comment on the electromagnetic corrections to the Okun-Pomeranchuk theorem.

• OSTI ID: 21426737
• Journal Information: Physics of Atomic Nuclei, Vol. 73, Issue 4; Other Information: DOI: 10.1134/S1063778810040137; Copyright (c) 2010 Pleiades Publishing, Ltd.; ISSN 1063-7788
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR MOMENTUM
ASYMPTOTIC SOLUTIONS
COMPARATIVE EVALUATIONS
ELECTROPRODUCTION
EXPERIMENTAL DATA
HERA STORAGE RING
POMERANCHUK THEOREM
PROTONS
STRUCTURE FUNCTIONS
BARYONS
BASIC INTERACTIONS
DATA
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
EVALUATION
FERMIONS
FUNCTIONS
HADRONS
INFORMATION
INTERACTIONS
MATHEMATICAL SOLUTIONS
NUCLEONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
STORAGE RINGS