arXiv subjects

O. V. Teryaev

Publications and source records attributed to O. V. Teryaev.

188 records · Page 11Linked to original sources

arXiv1996

Quark Mass Corrections to the Bjorken and Gross--Llewellyn-Smith Sum Rules

Quark mass corrections to the spin partonic structure function g_1(x,Q^2) and function F_3(x,Q^2) are obtained at the order O(alpha_s) along with the coefficient functions C^{(A)} and C^{(V)} related to the Bjorken and Gross--Llewellyn-Smith sum rules. In the massless limit the difference between F_3 and g_1 is encountered to be (alpha_s/π)*CF*(1-x). The results for the functions C^{(A)} and C^{(V)} at m=0 agree with the previous MS-scheme calculations C^{(A)}=C^{(V)}=1-(3*alpha_s/4π)*CF.

hep-ph↗

arXiv1995

Gluon Contribution to the Transverse Spin Structure Function g2

We consider the twist-3 gluon contribution to the transverse spin structure function $g_2$.We find that the Burkhardt-Cottingham sum rule is satisfied. The additional {\it nonlocal} operators appear in the moments of g2 which were absent in previous analysis of Bukhvostov, Kuraev and Lipatov.

hep-ph↗

arXiv1995

Extraction of the pion distribution amplitude from polarized muon pair production

We consider the production of muon pairs from the scattering of pions on longitudinally polarized protons. We calculate the cross section and the single spin asymmetry for this process, taking into account pion bound state effects. We work in the kinematic region where the photon has a large longitudinal momentum fraction, which allows us to treat the bound state problem perturbatively. Our predictions are directly proportional to the pion distribution amplitude. A measurement of the polarized Drell-Yan cross section thus allows the determination of the shape of the pion distribution amplitude.

hep-ph↗

arXiv1995

Decay Anisotropy of $e^+e^-$ Sources from $pN$ and $pd$ collisions

A full calculation of lepton-pair angular characteristics is carried out for $e^+e^-$ pairs created in $pp$, $pn$ and $pd$ collisions at intermediate energies. It is demonstrated that the proposed new observable, the dilepton decay anisotropy, quite sensitively changes for different sources and may be useful for their disentangling. The relevance of the dilepton decay anisotropy is shown in the context of a puzzling energy behavior for the ratio of the lepton yield from $pd$ to $pp$ reactions as observed at the BEVALAC.

nucl-th↗

arXiv1995

Relations between Spin Structure Functions and Quark Mass Corrections to Bjorken Sum Rule

The power correction, surviving the zero quark mass limit and found earlier to restore the validity of Burkhardt-Cottingham sum rule, provides the contribution to the Bjorken sum rule as well. The leading perturbative correction to the Bjorken sum rule is increased by the factor 4/3 for light quarks and 5/3 for heavy quarks. The resulting value for the Bjorken sum rule for light quarks is in excellent agreement with the most precise SLAC data. The same correction should appear in the case of the Gross-Llewellyn Smith sum rule. It completely removes the observed deficit of this sum rule within the experimental errors.

hep-ph↗

arXiv1994

Spin-Momentum Correlation (Handedness) in the Process of Four Pions Production in the Electron-Positron Collisions

We discuss special type of polarization asymmetry (``handedness") in the process $e^+e^-\to 4π$, when one of initial particles is longitudinally polarized. The asymmetry is proportional to the degree of polarization and to the width to mass ratio of rho-meson. It can reach 4-5\% in some kinematical region. Both channels $2 π^+ 2 π^-$ and $2 π^0 π^+ π^-$ are considered in the framework of the effective chiral lagrangian with vector mesons, in the energy range $\sim 1$ GeV. The corresponding total cross sections are also calculated.

hep-ph↗

arXiv1994

On the $G_2$ Manifestation for Longitudinally Polarized

The contribution of the $G_2$ structure function to polarized deep inelastic scattering is slightly redefined in order to avoid kinematical zeros. Its strong $Q^2$-dependence implied by the Burkhardt-Cottingham (BC) sum rule naturally explains the sign change of the generalized Gerasimov-Drell-Hearn (GDH) sum rule. The status of the BC sum rule and implications for other spin processes are discussed.

hep-ph↗

arXiv1993

The Emc Spin Crisis: Comparing Proton and Photon

The "kinematical" resolution of the $U_A(1)$ problem is proposed. The cancellation of photonic and gluonic anomalies suggested by the t'Hooft consistency principle naturally explains the zero singlet contributions to the first moments of proton and photon spin structure functions. The new sum rule for the photon spin structure function is derived. The strong strong $Q^2$-dependence of the Gerasimov-Drell-Hearn sum rule is related to the $G_2$ structure function and to the gluonic anomaly.

hep-ph↗