Fiore, R., Nikolaev, N. N., Zoller, V. R.
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...
Beauty, charm and $F_L$ at HERA: new data vs. early predictions (2009)
Nikolaev, N. N., Zoller, V. R.
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...
Higher twist effects in charmed-strange $\nu$DIS diffraction (2008)
The non-conservation of charmed-strange current in the neutrino deep inelastic scattering ($\nu$DIS) gives rise to sizable corrections to the longitudinal structure function, $F_L$, at small values...
Current non-conservation effects in $\nu$DIS diffraction (2008)
In the neutrino DIS diffraction the charged current non-conservation gives rise to sizable corrections to the longitudinal structure function, $F_L$. These corrections is a higher twist effect...
Full of charm neutrino DIS (2008)
The color dipole analysis of small-$(x, Q^2)$ neutrino DIS induced by the charmed-strange ($cs$) current reveals ordering of dipole sizes $m_c^{-2}
Charm of small $x$ neutrino DIS (2008)
Due to the weak current non-conservation the diffractive excitation of charm and strangeness dominates the longitudinal structure function $F_L(x,Q^2)$ of neutrino DIS at small Bjorken $x$. Based on...
Color dipoles, PCAC and Adler's theorem (2007)
Being reformulated in the color dipole basis of small-x QCD Adler's theorem establishes a connection between perturbative and non-perturbative descriptions of DIS and quantifies the effect of...
Left and Right in small-x neutrino DIS (2006)
The color dipole analysis of nuclear effects in charge current DIS is presented. The emphasis is put on the pronounced effect of left-right asymmetry of shadowing in neutrino-nucleus DIS at small...
Unitarity constraints for DIS off nuclei: predictions for electron-ion colliders (2006)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
Future electron-ion colliders (eIC) will focus on the unitarity properties of deep inelastic scattering (DIS) in the limit of strong nuclear absorption. Strong nuclear shadowing and a large abundance...
High energy neutrino in a nuclear environment: mirror asymmetry of the shadowing effect (2006)
The parity non-conservation effect in diffractive charged current DIS is quantified in terms of color dipole sizes of left-handed and right-handed electroweak bosons. We identify the origin and...
Glue in the pomeron from nonlinear k_\perp-factorization (2006)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
We derive the nonlinear k_\perp-factorization for the spectrum of jets in high-mass diffractive deep inelastic scattering as a function of three hard scales - the virtuality of the photon Q^2, the...
Nonlinear $k_{\perp}$-factorization: a new paradigm for an in-nucleus hard QCD (2005)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
We review the origin, and salient features, of the breaking of the conventional linear $k_{\perp}$-factorization for an in-nucleus hard pQCD processes. A realization of the nonlinear...
Left-right asymmetry of nuclear shadowing in charged current DIS (2005)
We study the shadowing effect in highly asymmetric diffractive interactions of left-handed and right-handed W-bosons with atomic nuclei. The target nucleus is found to be quite transparent for the...
Charged currents, color dipoles and xF_3 at small x (2005)
We develop the light-cone color dipole description of highly asymmetric diffractive interactions of left-handed and right-handed electroweak bosons. We identify the origin and estimate the strength...
Nonlinear k_\perp-factorization for Quark-Gluon Dijet Production off Nuclei (2005)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
The breaking of conventional linear k_\perp-factorization for hard processes in a nuclear environment is by now well established. Here we report a detailed derivation of the nonlinear...
Hard Scattering in a Nuclear Environment: Farewell to Linear $k_{\perp}$-Factorization (2005)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
We discuss a dramatic change brought into the pQCD description of hard processes in a nuclear environment by a large thickness of heavy nuclei. It breaks the familiar linear $k_{\perp}$-factorization...
Triple-pomeron dynamics: valence vs. glue (2004)
Three pomerons are known to couple via the gluon loop and interactions of this kind which are responsible for high-mass diffraction are described in terms of the gluonic structure function of the QCD...
Evolution of high-mass diffraction from the light quark valence component of the pomeron (2004)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
We analyze the contribution from excitation of the $(q\bar q)(f\bar f),(q\bar q)g_1...g_n(f\bar f)$ Fock states of the photon to high mass diffraction in DIS. We show that the large $Q^2$ behavior of...
Color dipoles and k_t factorization for nuclei (2004)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
We discuss applications of the color dipole approach to hard processes on nuclei. We focus on the relation to k_t--factorisation and the role of a nuclear unintegrated gluon distribution in single--...
Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
Based on an approach to non-Abelian propagation of color dipoles in a nuclear medium we formulate a nonlinear k_t-factorization for the breakup of photons and pions into forward hard dijets in terms...
Absorption in Ultra-Peripheral Nucleus-Atom Collisions in Crystal (2004)
The Glauber theory description of particle- and nucleus-crystal Coulomb interactions at high-energy is developed. The allowance for the lattice thermal vibrations is shown to produce strong...
Ultra-Relativistic Nuclei in Crystal Channel: Coulomb Scattering, Coherence and Absorption (2004)
We incorporate the effect of lattice thermal vibrations into the Glauber theory description of particle- and nucleus-crystal Coulomb interactions at high-energy. The allowance for the lattice thermal...
Decorrelation of forward dijets in DIS off nuclei (2003)
Based on the color dipole QCD approach we discuss the multiple scattering mechanism (MSM) of suppression of back-to-back azimuthal correlations of high $p_{T}$ forward dijets in DIS off nuclei. We...
Nonlinear kT factorization for Forward Dijets in DIS off Nuclei in the Saturation Regime (2003)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
We develop the QCD description of the breakup of photons into forward dijets in small-x deep inelastic scattering off nuclei in the saturation regime. Based on the color dipole approach, we derive a...
High Density QCD, Saturation and Diffractive DIS (2002)
Ivanov, I. P., Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
We review a consistent description of the fusion and saturation of partons in the Lorentz-contracted ultrarelativistic nuclei in terms of a nuclear attenuation of color dipole states of the photon...
Lectures on Diffraction and Saturation of Nuclear Partons in DIS off Heavy Nuclei (2002)
Ivanov, I. P., Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
The Lorentz contraction of ultrarelativistic nuclei entails a spatial overlap and fusion (recombination, saturation) of partons belonging to different nucleons at the same impact parameter. In these...
High Density QCD and Saturation of Nuclear Partons (2002)
Ivanov, I. P., Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
We review the recent finding of the two-plateau momentum distribution of sea quarks in deep inelastic scattering off nuclei in the saturation regime. The diffractive plateau which dominates for small...
Saturation of Nuclear Partons: the Fermi Statistics or Nuclear Opacity? (2002)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
We derive the two-plateau momentum distribution of final state (FS) quarks produced in deep inelastic scattering (DIS) off nuclei in the saturation regime. The diffractive plateau which dominates for...
Diffractive Hard Dijets and Nuclear Parton Distributions (2002)
Ivanov, I. P., Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
Diffraction plays an exceptional role in DIS off heavy nuclei. First, diffraction into hard dijets is an unique probe of the unintegrated glue in the target. Second, because diffraction makes 50 per...
Coherent Coulomb excitation of relativistic nuclei in aligned crystal targets (2001)
We study coherent Coulomb excitation of ultrarelativistic nuclei passing through the aligned crystal target. We develop multiple scattering theory description of this process which consistently...
Diffractive beauty photoproduction as a short distance probe of QCD pomeron (2001)
High-energy open beauty photoproduction probes the vacuum exchange at distances $\sim 1/m_b$ and detects significant corrections to the BFKL asymptotics coming from the subleading vacuum poles. We...
Small-x Structure Functions and QCD Pomeron (2000)
Nikolaev, N. N., Zoller, V. R.
The recent progress in color BFKL-Regge phenomenology of small-x DIS on nucleons, pions and photons is reviewed
Probing the QCD pomeron in high-energy $\gamma^*\gamma^*$ collisions (2000)
Based on the color dipole representation, we investigate consequences for the $\gamma^{*}\gamma^{*},\gamma^{*}\gamma$ scattering of the finding by Fadin, Kuraev and Lipatov that incorporation of...
Nikolaev, N. N., Speth, J., Zoller, V. R.
High-energy virtual photon-virtual photon scattering can be viewed as interaction of small size color dipoles from the beam and target photons, which makes $\gamma^{*}\gamma^{*}, \gamma^{*}\gamma$...
How open charm production and scaling violations probe the rightmost hard BFKL pole exchange (2000)
Nikolaev, N. N., Zoller, V. R.
In 1994 Zakharov and the present authors argued that in color dipole (CD) BFKL approach to DIS excitation of open charm at moderately large Q2 is dominated by hard BFKL exchange. In view of the rapid...
Nikolaev, N. N., Speth, J., Zoller, V. R.
As noticed by Fadin, Kuraev and Lipatov in 1975 incorporation of asymptotic freedom into the BFKL equation splits the QCD pomeron into a series of isolated poles in complex angular momentum plane....
Precocious asymptopia for charm from the running BFKL (1998)
Nikolaev, N. N., Zoller, V. R.
The running BFKL equation gives rise to a series of moving poles in the complex j-plane. Corresponding eigenfunctions (color dipole cross sections) are the oscillating functions of the color dipole...
The Running BFKL: Resolution of Caldwell's Puzzle (1998)
Nikolaev, N. N., Zoller, V. R.
The HERA data on the proton structure function, $F_2(x,Q^2)$, at very small $x$ and $Q^2$ show the dramatic departure of the logarithmic slope, $\partial F_2/\partial\log Q^2$, from theoretical...
Forward Cone in Exclusive Heavy Vector Meson Production (1998)
The color dipole gBFKL phenomenology of a diffraction cone for photo- and electroproduction $\gamma^{*}N \to VN$ of heavy vector mesons (charmonium & bottonium) at HERA and in fixed target...
The Running BFKL: Precocious Asymptopia for Charm and the $dF_{2}/d\log Q^2$ - Puzzle (1998)
The running BFKL equation gives rise to a series of moving poles in the complex $j$-plane. The first nodes for all subleading solutions (color dipole cross sections) accumulate at $r_1\sim 0.1...
The diffraction cone for exclusive vector meson production in deep inelastic scattering (1997)
Nemchik, J., Nikolaev, N. N., Predazzi, E., Zakharov, B. G., Zoller, V. R.
We develop the color dipole gBFKL phenomenology of a diffraction cone for photo- and electroproduction $\gamma^{*}N \to VN$ of heavy vector mesons (charmonium & bottonium) at HERA and in fixed target...
The BFKL-Regge Phenomenology of Deep Inelastic Scattering (1997)
Nikolaev, N. N., Zakharov, B. G., Zoller, V. R.
We calculate the Regge trajectories of the subleading BFKL singularities and eigenfunctions for the running BFKL pomeron in the color dipole representation. We obtain a viable BFKL-Regge expansion of...
Coherent neutrino magnetic conversion in crystals (1997)
We study coherent enhancement of neutrino electro-magnetic conversion in crystals. Large coherency length which grows with the neutrino energy makes the coherent enhancement particularly effective...
Rare processes and coherent phenomena in crystals (1996)
We study coherent enhancement of Coulomb excitation of high energy particles in crystals. We develop multiple scattering theory description of coherent excitation which consistently incorporates both...
Diffraction in DIS on nuclear targets (1996)
Nikolaev, N. N., Schaefer, W., Zakharov, B. G., Zoller, V. R.
We discuss the implications of a strong enhancement of diffraction for multiproduction in DIS off nuclear targets. The predicted effects are large and observable at HERA. We present the prediction of...
Exploratory study of shrinkage of the diffraction cone for the generalized BFKL pomeron (1995)
Nikolaev, N. N., Zakharov, B. G., Zoller, V. R.
In color dipole gBFKL dynamics, we describe the emerging gBFKL phenomenology of a subasymptotic energy dependence of the diffraction slope and discuss possibilities of testing the gBFKL predictions...
We apply the light-cone technique to electroproduction reaction $ep\to e\pi^+n$ long considered as a means of measuring the electromagnetic form factor of the pion. We show that the interpretation of...
The direct calculation of the slope of the QCD pomeron's trajectory (1994)
Nikolaev, N. N., Zakharov, B. G., Zoller, V. R.
We demonstrate that the diffraction slope of the generalized BFKL pomeron amplitude has the conventional Regge growth $B(s) = B(0) + 2\alpha_{\Pom}'\log(s)$. This proves that the generalized BFKL...
Nikolaev, N N, Szczurek, A, Speth, J, Wambach, J, Zakharov, B G, Zoller, V R
The spectral function, measured in $A(e,e'p)$ reactions, is distorted by the final-state interaction of the struck proton with the residual nucleus. This causes a broadening of the observed...
Why more hadronlike photons produce less particles on nuclear targets (1994)
Nikolaev, N. N., Zakharov, B. G., Zoller, V. R.
In hadron-nucleus interactions, the stronger is nuclear shadowing in the total cross section the higher is the multiplicity of secondary hadrons. In deep inelastic scattering, nuclear shadowing at...
The BFKL and GLDAP regimes for the perturbative QCD pomeron (1994)
Nikolaev, N. N., Zakharov, B. G., Zoller, V. R.
The $S$-matrix of diffractive scattering is diagonalized in terms of the colour dipole-dipole cross section. Recently, we have shown that the dipole cross section satisfies the generalized BFKL...
Nikolaev, N. N., Szczurek, A., Speth, J., Wambach, J., Zakharov, B. G., Zoller, V. R.
The spectral function, measured in $A(e,e'p)$ reactions, is distorted by the final-state interaction of the struck proton with the residual nucleus. This causes a broadening of the observed...
The spectrum and solutions of the generalized BFKL equation for total cross section (1994)
Nikolaev, N. N., Zakharov, B. G., Zoller, V. R.
The colour dipole cross section is the principal quantity in the lightcone $s$-channel description of the diffractive scattering. Recently we have shown that the dipole cross section satisfies the...
The $s$-channel approach to Lipatov's pomeron and hadronic cross sections (1993)
Nikolaev, N. N., Zakharov, B. G., Zoller, V. R.
We derive a generalized Balitskii-Fadin-Kuraev-Lipatov equation, which applies directly to the perturbative QCD component of total cross section. With the gluon correlation radius $R_{c} \sim 0.4$f...
Correlation Effects in the Final-State Interaction for Quasielastic $(e,e'p)$ Scattering (1993)
Nikolaev, N. N., Szczurek, A., Speth, J., Wambach, J., Zakharov, B. G., Zoller, V. R.
Color transparency predicts that, in $(e,e'p)$ reactions at large $Q^2$, the final-state interaction becomes weaker than the reference value predicted from the free-nucleon cross section. This...
The Onset of Color Transparency in $(e,e'p)$ Reactions on Nuclei (1993)
Nikolaev, N. N., Szczurek, A., Speth, J., Wambach, J., Zakhorov, B. G., Zoller, V. R.
Quantum filtering of the ejectile wave packet from hard $ep$ scattering on bound nucleons puts stringent constraints on the onset of color transparency in $(e,e'p)$ reactions in nuclei at moderate...