The BFKL-Regge factorization and $F_2^b$, $F_2^c$, $F_L$ at HERA: physics implications of nodal properties of the BFKL eigenfunctions

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, $F_2^c$, and the longitudinal, $F_L$, 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 $α_{\Pom}(0)-1=Δ_{\Pom}\approx 0.4$. 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-$x$ $F_2^c$, $F_2^b$ and $F_L$ we extend our early 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 on $F_2^b$ but slightly overshoot the very recent (2008, preliminary) H1 results on $F_2^b$.

13 pages, 4 figures, JETP Letters, Fig.5 removed

References in corpus (5)

• Diffractive Vector Meson Production at HERA: from Soft to Hard QCD
• Measurement of the Proton Structure Function F_L at Low x
• Measurement of F_2^{c\bar{c}} and F_2^{b\bar{b}} at Low Q^2 and x using the H1 Vertex Detector at HERA
• Evidence for the Discrete Asymptotically-Free BFKL Pomeron from HERA Data
• A Variable Flavour Number Scheme for Heavy Quark Production at Small x

Cited by in corpus (15)

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• The predictions of the charm structure function exponents behaviour at low x in deep inelastic scattering
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• Top reduced cross section behavior at the LHeC kinematic range
• Color screening, absorption and ${\sigma }_{tot}^{pp}$ at LHC
• The behavior of the heavy-quarks structure functions at small-$x$
• The exponent of the longitudinal structure function $F_L$ at low $x$
• Non-linear BFKL dynamics: color screening vs. gluon fusion
• Importance of the heavy-quarks longitudinal structure function measurements at future circular collider energies
• Heavy quark currents in ultra-high energy neutrino interactions
• Heavy quarks structure functions $F_2^{q\bar{q}}(x,Q^2)$ and $F_L^{q\bar{q}}(x,Q^2)$ at the NLO approximation
• Heavy quark structure functions from unifying the color dipole picture and double asymptotic scaling approaches
• Influence of gluon behavior on heavy-quark pair production
• Geometrical scaling of heavy-quark contributions in the low $x$ region