Soft Contribution to Quark-Quark Scattering Induced by an Anomalous Chromomagnetic Interaction

We calculate the soft contribution to high energy quark-quark scattering that arises from an instanton-induced quark anomalous chromomagnetic moment. We demonstrate that this is a large contribution, which cannot be neglected for transverse momenta of a few GeV. We discuss the influence of this effect on inclusive particle production.Comment: 4 pages, 2 figure

Instanton Contribution to Polarized and Unpolarized Gluon Distribution in Nucleon

The contribution of the anomalous quark-gluon interaction induced by instantons to the polarized and unpolarized gluon distributions in nucleon is estimated. It is shown that this interaction leads to negative gluon polarization in nucleon.Comment: 9 pages, Latex, 3 figures. Talk presented at DIS97 Workshop, April 1997, Chicago, US

Instanton Effects in NNˉN\bar N Annihilation

It is shown that specific spin-flavour properties of the nonperturbative interaction between quarks induced by instantons allow us to explain the peculiarities of the OZI rule violation in $N \bar N$ annihilation. New experiments to test the instanton mechanism of the OZI rule violation are proposed.Comment: 11 pages, Late

Instantons and Single Spin Asymmetries

A new mechanism for single spin asymmetries in strong interaction is proposed. It is based on instanton-induced nonperturbative chromomagnetic quark-gluon interaction. We estimate the contribution of this interaction to single spin asymmetry in quark-quark scattering. It is shown, that interference between quark spin-flip amplitude induced by instantons and spin-nonflip amplitude, which is related to nonperturbative two gluon exchange, gives a large value for a single spin asymmetry. Due to strong increasing of the instanton-induced spin-flip amplitude with energy, this asymmetry does not vanish at high energies.Comment: 7 pages, Latex, 2 figures. To appear in Proc. Workshop ``Physics with Polarized Protons at HERA'' August 1997,DESY-Zeuthe

Hard diffraction and proton spin problem

It is shown, that the hard component of quarks distribution functions induced by instantons gives the essential contribution to hard diffractive processes. We predict large polarization effects in these processes.Comment: Preprint FUB-HEP/93-99, 7 pages+5 figures (accessible by request

Anomalous Quark Chromomagnetic Moment Induced by Instantons

It is shown that the quark-gluon interaction induced by instantons leads to the quark anomalous chromomagnetic moment. In the instanton-liquid model for the QCD vacuum, the chromomagnetic moment is $\mu_a=-\frac{\pi f}{2\alpha_s}$, where f is the packing fraction of instantons in the vacuum.Comment: 5 pages, Latex, no figures. Talk presented at the XIII International Seminar on High Energy Physics Problems, 2-7 September, Dubna, Russia. One reference is correcte

A New Mechanism for Single Spin Asymmetries in Strong Interactions

It is shown that the contribution of the instantons to the fragmentation of quarks leads to the appearance of a imaginary part in diagrams of quark-quark scattering at large transfer momentum. The imaginary part comes from the analytical continuation of the instanton amplitudes from Euclidean to Minkowsky space-time and reflects quasiclassical origin of instanton solution of QCD equations of motion. This phenomenon and instanton--induced quark spin-flip give a new nonperturbative mechanism for the observed anomalous single-spin asymmetries in hadron-hadron and lepton-hadron interactions.Comment: 8 pages, 3 figures, Latex; final version to appear in JETP Let

Charge Symmetry Breaking in Pion-Nucleon Coupling Constants Induced by Axial Anomaly

The contribution of axial anomaly to charge symmetry breaking in pion-nucleon coupling constants is calculated within instanton model for QCD vacuum. It has been demonstrated that the contribution is large and allows to explain Nolen-Schiffer anomaly.Comment: 4 pages. Contribution to "Sense of Beauty in Physics - a volume in honour of Adriano Di Giacomo" (Pisa University Press, Pisa, 2006), on the occasion of his 70th birthda

Anomalous violation of the OZI-rule in the NNˉ→ΦΦN\bar N\to \Phi\Phi, NNˉ→ΦγN\bar N\to \Phi\gamma reactions and instantons

It is shown, that specific properties of the instanton induced interaction between quarks leads to the anomalous violation of the OZI-rule in the $N\bar N\to \Phi\Phi$, $N\bar N\to \Phi\gamma$ reactions. In the framework of instanton model of the QCD vacuum, the energy dependence of the cross sections of these reactions is calculated.Comment: 13 pages, 3 figure

Nonlocality of the Nucleon Axial Charge and Solar Neutrino Problem

It is shown that the specific space distribution of the nucleon axial charge may lead to the significant reduction of the cross section of the reaction $p+p\to D+e^++\nu$ and may provide the mechanism to explain observed deficit of solar neutrinos.Comment: 4 pages, 1 figure, Late