Searcharxiv⌕ Search

arXiv subjects

A. V. Luchinsky

Publications and source records attributed to A. V. Luchinsky.

53 records · Page 3Linked to original sources
arXiv2008

Study of exclusive processes e^+ e^- \to VP

This paper is devoted to consideration of the hard exclusive processes $e^+e^- \to VP$, where $V=ρ,ϕ; P=η,η'$. Experimental measurement of the cross section of the process $e^+ e^- \to ϕη$ at BaBar collaboration at large center mass energy $\sqrt s=10.6$ GeV and some low energy experimental data $\sqrt s \sim 2-4$ GeV give us the possibility to study the cross section in the broad energy region. As the result, we have determined the asymptotic behavior of the cross section of $e^+ e^- \to ϕη$ in the limit $s \to \infty$, which is in agreement with perturbative QCD prediction. Assuming that the same asymptotic behavior is valid for the other processes under consideration and using low energy experimental data we have predicted the cross sections of these processes at energies $\sqrt s=3.67,~10.6$ GeV. In addition, we have calculated the cross sections of these processes at the same energies within perturbative QCD. Our results are in agreement with available experimental data.

hep-ph↗
arXiv2008

Double vector quarkonia production in exclusive Higgs boson decays

Partial decay widths and branching fractions are calculated for the exclusive decays of the Standard Model Higgs boson into a pair of vector quarkonium states, $ H\to J/ψJ/ψ, H\to ΥΥ, H\to J/ψϕ, H\to J/ψΥ$, with relativistic corrections due to quark motion in mesons taken into account.

hep-ph↗
arXiv2008

Lepton pair production in muon scattering by nucleus

Coherent production of lepton pair in muon scattering by nucleus is considered. With the help of different approaches (equivalent photon approximation, direct numerical and analytical calculations) we obtain total cross section of this reaction and distributions over invariant masses of final leptons. Special attention is paid to influence of final lepton identity on total and differential cross sections. We also study the role of coherence condition. Total cross sections of charmonia production in muon interaction with electromagnetic field of nucleus are also presented.

hep-ph↗
arXiv2007

New Polarization Program at U70 (SPASCHARM Project)

The new polarization program SPASCHARM is being prepared in Protvino. The program has two stages. The first stage is dedicated to single-spin asymmetries in the production of miscellaneous light resonances with the use of 34 GeV $π^-$-beam. Inclusive and exclusive reactions will be studied simultaneously. The second stage is dedicated to single-spin and double-spin asymmetries in charmonium production with the use of 70 GeV polarized proton beam which will allow us to understand charmonium hadronic production mechanism and make gluon polarization $Δg(x)$ extraction at large $x$.

hep-ex↗
arXiv2007

Charmonium production in hadronic experiments at the energy 70 GeV

The production of the charmonium states in hadronic experiments is considered in NLO at the strong coupling constant. It is shown, that such an approach solves some significant problems, arising when only leading order processes are considered. In particular, in such a consideration distributions over the transverse momentum of the final charmonium can be obtained. There appears also a natural explanation to the existence of $χ_{c1}$-meson in final state, that is observed experimentally and cannot be produced in leading order processes.

hep-ph↗
arXiv2007

The study of leading twist light cone wave function of η_c meson

This paper is devoted to the study of leading twist light cone wave function of $η_c$ meson. The moments of this wave function have been calculated within three approaches: potential models, nonrelativistic QCD and QCD sum rules. Using the results obtained within these approaches the model for the light cone wave function of leading twist has been proposed. Being scale dependent light cone wave function has very interesting properties at scales $μ> m_c$: improvement of the accuracy of the model, appearance of relativistic tail and violation of nonrelativistic QCD velocity scaling rules. The last two properties are the properties of real leading twist light cone wave function of $η_c$ meson.

hep-ph↗
arXiv2006

The process $\epem\to J/ ψX(3940)$ at $\sqrt s = 10.6$ GeV in the framework of light cone formalism

This paper is devoted to the study of the process $\epem\to J/ψX(3940)$ in the framework of light cone formalism. In our calculation two hypotheses about the structure of X(3940) meson are considered: X(3940) is $3^1$S$_0$ state and X(3940) is one of $2^3$P states. The former hypothesis leads to a good agreements with the cross section measured at the experiment. As to the latter one, it is proposed a mechanism that allows one to understand the suppression of 2P mesons production in hard processes.

hep-ph↗
arXiv2006

Systematics of heavy quarkonia from Regge trajectories on $(n,M^2)$ and $(M^2,J)$ planes

In this paper we show that heavy quarckonium states, similar to light mesons, form Regge trajectories in $(n,M^2)$ and $(M^2,J)$ planes and the slope of these trajectories is independent on the quantum numbers of the mesons. This fact can be useful for the prediction of the masses of heavy quarkonia and the determination of the quantum numbers of the newly discovered states.

hep-ph↗
arXiv2005

Inclusive decays χ_{b0,2}->ψD\bar D+X and the duality relation

In this article we consider the three-particle decays $χ_{b0,2}\to J/ψc\bar c\to J/ψD\bar D+X$. We present the analytical formulae for the differential widths of these decays, the numerical values of their integrated widths and check the duality relation that connects the decays $χ_{b0,2}\toψc\bar c$ with the two-particle decays $χ_{b0,2}\to J/ψ(c\bar c)$. We also study the possibility of observing the $χ_{b0,2}\to J/ψDD+X$ mode at Tevatron and LHC colliders.

hep-ph↗
arXiv2005

Observation potential for χ_b at the Tevatron and LHC

We confirm the results of previous works that the internal motion of quarks inside charmonium mesons increases the cross section of the process $e^+e^-\to $J/ψη_c$. We also show, that this effect increases the widths of the scalar meson decay into two vector ones and state that the decays $χ_{b0,2}\to2J/ψ$ can be used to detect these scalar mesons at Tevatron and LHC colliders.

hep-ph↗
arXiv2005

Excited charmonium mesons production in e^+e^- annihilation at \sqrt{s}=10.6 GeV

In this paper the production of excited vector and pseudoscalar charmonium mesons in $\epem$ annihilation is analyzed in the framework of light cone. In particular the cross sections $\epem \to ψ(2S)η_c(1S), ψ(1S)η_c(2S),ψ(2S)η_c(2S)$ have been calculated. It is shown, that contrary to NRQCD the cross sections calculated in the framework of light cone agree with experimental data.

hep-ph↗
arXiv2005

Leading twist contribution to color singlet $χ_{c0,2}\toωω$ decays

In this paper the leading twist contribution to $χ_{c0,2}\toωω$ decays in the color singlet approximation is considered. It is shown, that the predictions for $\Br(χ_0\toωω)$ is in a good agreement with the experimental data, while $\Br(χ_{c2}\toωω)$ differs from the experiment significantly.

hep-ph↗
arXiv2003

Inclusive vector charmonium production in two-photon e^+ e^- -annihilation at \sqrt{s}=10.6 GeV

In this paper we study inclusive production of vector charmonium states $J/ψ$ or $ψ(2S)$ in two-photon $\epem$-annihilation at $\sqrt s=10.6 \rm GeV$ using color-singlet model. Analytic expressions for differential cross sections, numerical values of total cross sections and plots of different distributions are presented. These distributions differ significantly from the one-photon case so these modes can be easily separated.

hep-ph↗
arXiv2003

On double $1^{--}$ charmonium production through two-photon $\e^+ e^-$ annihilation at $\sqrt{s}=10.6 GeV$

Recent measurements of the Belle Collaboration of the exclusive production of two charmonia in the $e^+e^-$ annihilation differ substantially from theoretical predictions. Recently it was suggested that a significant part of this discrepancy can be explained by the process $e^2e^- --> 2J/psi$ and value for its cross-section was published. In this paper it is shown, that these results are incorrect and the values for the cross-sections of the production of different vector charmonia are presented.

hep-ph↗