Two-pion decays of mesons and confinement singularities (2009)
Anisovich, A. V., Anisovich, V. V., Matveev, M. A., Nikonov, V. A., Nyiri, J., Sarantsev, A. V.
We consider the two-pion decay of the $\rho$-meson, the $^3S_1q\bar q$-state of the constituent quarks -- the decay being determined by the transition $q\bar q\to \pi\pi$ contains information about...
Anisovich, A. V., Anisovich, V. V., Dakhno, L. G., Matveev, M. A., Nikonov, V. A., Sarantsev, A. V.
In the framework of the relativistic and gauge invariant spectral integral technique, we calculate radiative decays rho(770)-> gamma pi(140) and omega(780)-> gamma pi(140) supposing all mesons (pi,...
Photoproduction of $\eta$ mesons off neutrons from a deuteron target (2008)
Anisovich, A. V., Jaegle, I., Klempt, E., Krusche, B., Nikonov, V. A., Sarantsev, A. V., ...
A formalism is developed for the partial wave analysis of data on meson photoproduction off deuterons and applied to photoproduction of $\eta$ and $\pi^0$ mesons. Different interpretations of a...
Sarantsev, A. V., Anisovich, A. V., Nikonov, V. A., Schmieden, H.
We study polarization variables in the photoproduction of omega-mesons with subsequent omega to gamma pi^0 decay. Single and double polarization observables are calculated as a function of different...
Quasi-free photoproduction of eta-mesons of the neutron (2008)
Jaegle, I., Mertens, T., Anisovich, A. V., Bacelar, J. C. S., Bantes, B., Bartholomy, O., ...
Quasi-free photoproduction of eta-mesons off nucleons bound in the deuteron has been measured with the CBELSA/TAPS detector for incident photon energies up to 2.5 GeV at the Bonn ELSA accelerator....
N* and Delta* decays into N pi0 pi0 (2007)
Thoma, U., Fuchs, M., Anisovich, A. V., Anton, G., Bantes, R., Bartholomy, O., ...
Decays of baryon resonances in the second and the third resonance region into N pi0 pi0 are studied by photoproduction of two neutral pions off protons. Partial decay widths of N* and Delta*...
Baryon resonances and polarization transfer in hyperon photoproduction (2007)
Anisovich, A. V., Kleber, V., Klempt, E., Nikonov, V. A., Sarantsev, A. V., Thoma, U.
A partial wave analysis is presented of data on photoproduction of hyperons including single and double polarization observables. The large spin transfer probability reported by the CLAS...
Further evidence for N(1900)P_{13} from photoproduction of hyperons (2007)
Nikonov, V. A., Anisovich, A. V., Klempt, E., Sarantsev, A. V., Thoma, U.
We report further evidence for $N(1900)P_{13}$ from an analysis of a large variety of photo- and pion-induced reactions, in particular from the new CLAS measurements of double polarization...
Anisovich, A. V., Anisovich, V. V., Klempt, E., Nikonov, V. A., Sarantsev, A. V.
Partial wave scattering amplitudes in baryon-baryon and baryon-antibaryon collisions and amplitudes for the production and decay of baryon resonances are constructed in the framework of the...
Partial decay widths of baryons in the spin-momentum operator expansion method (2006)
Anisovich, A. V., Sarantsev, A. V.
The cross sections for photo- and pion-induced production of baryon resonances and their partial decay widths to the two--body and multi--body final states are calculated in the framework of the...
Radiative decays of quarkonium states, momentum operator expansion and nilpotent operators (2005)
Anisovich, A. V., Anisovich, V. V., Markov, V. N., Matveev, M. A., Nikonov, V. A., Sarantsev, A. V.
We present the method of calculation of radiative decays of composite quark-antiquark systems with different J^{PC}: (Q\bar Q)_{in} -> gamma (Q\bar Q)_{out}. The method is relativistic invariant, it...
The Riddle of the f0(980) and a0(980): Are They the Quark-Antiquark States? (2005)
Anisovich, A. V., Anisovich, V. V., Dakhno, L. G., Markov, V. N., Matveev, M. A., Nikonov, V. A., ...
A list of arguments favouring quark-antiquark nature of a0(980) and f0(980) is presented.
Photoproduction of Baryons Decaying into N pi and N eta (2005)
Anisovich, A. V., Sarantsev, A., Bartholomy, O., Klempt, E., Nikonov, V. A., Thoma, U.
A combined analysis of photoproduction data on \gamma p to \pi N, eta N was performed including the data on K Lambda and K Sigma. The data are interpreted in an isobar model with s--channel baryon...
Decays of Baryon Resonances into K Lambda, K^+ Sigma^0 and K^0 Sigma^+ (2005)
Sarantsev, A. V., Nikonov, V. A., Anisovich, A. V., Klempt, E., Thoma, U.
Cross sections, beam asymmetries, and recoil polarisations for the reactions gamma p to K^+ Lambda ; gamma to K^+ Sigma^0, and gamma p to K^0 Sigma^+ have been measured by the SAPHIR, CLAS, and LEPS...
Partial wave decomposition of pion and photoproduction amplitudes (2004)
Anisovich, A. V., Klempt, E., Sarantsev, A., Thoma, U.
Partial wave amplitudes for production and decay of baryon resonances are constructed in the framework of the operator expansion method. The approach is fully relativistically invariant and allow us...
Determination of quark-antiquark component of the photon wave function for u, d, s quarks (2004)
Anisovich, A. V., Anisovich, V. V., Dakhno, L. G., Nikonov, V. A., Sarantsev, A. V.
Based on the data for the transitions pi0, eta, eta' -> gamma gamma^*(Q^2) and reactions of the e^+ e^- -annihilations, e^+ e^- -> rho0, omega, phi and e^+ e^--> hadrons at 1
Observation of the Second Tensor Nonet with the L3 Experiment (2004)
Schegelsky, V. A., Sarantsev, A. V., Nikonov, V. A., Anisovich, A. V., Levtchenko, M. P.
This paper was withdrawn by arXiv administrators upon request of the Chairperson and Spokesperson of the L3 Collaboration.
Decay $\phi (1020)\to \gamma f_0(980)$: analysis in the non-relativistic quark model approach (2004)
Anisovich, A. V., Anisovich, V. V., Markov, V. N., Nikonov, V. A., Sarantsev, A. V.
We demonstrate the possibility of a good description of the processes $\phi (1020)\to \gamma\pi\pi$ and $\phi (1020)\to \gamma f_0(980)$ within the framework of non-relativistic quark model assuming...
Anisovich, A. V., Anisovich, V. V., Markov, V. N., Matveev, M. A., Sarantsev, A. V.
The Bethe--Salpeter equations for the quark-antiquark composite systems with different quark masses, such as $q\bar s$ (with $q=u$,$d$), $q\bar Q$ and $s \bar Q$ (with $Q=c$,$b$), are written in...
Radiative decays of mesons in the quark model: relativistic and non-relativistic approaches (2003)
Anisovich, A. V., Anisovich, V. V., Nikonov, V. A.
Different conclusions about quark nature of f0(980) based on the analysis of data on the reaction phi(1020) -> gamma f0(980) make it necessary to perform detailed comparison of formulae used by...
Annihilation at rest of antiprotons and protons into neutral particles (2003)
Crystal Barrel Collaboration, Amsler, C, Anisovich, A V, Baker, C A, Barnett, B M, Batty, C J, ...
Annihilation at rest of antiprotons and protons into neutral particles (2003)
Amsler, C., Anisovich, A.V., Baker, C.A., Barnett, B.M., Batty, C.J., Benayoun, M., ...
Annihilation at rest of antiprotons and protons into neutral particles (2003)
Amsler, C., Anisovich, A.V., Baker, C.A., Barnett, B.M., Batty, C.J., Benayoun, M., ...
Anisovich, A. V., Anisovich, V. V., Markov, V. N., Matveev, M. A., Sarantsev, A. V.
The Bethe-Salpeter equations for the light-quark composite systems, q q-bar, are written in terms of spectral integrals. For the q q-bar -mesons characterized by the mass M, spin J and radial quantum...
Two-photon partial widths of tensor mesons (2002)
Anisovich, A. V., Anisovich, V. V., Matveev, M. A., Nikonov, V. A.
We calculate partial widths of the gamma-gamma decay of the tensor q\bar q states a_2(1320), f_2(1270), f_2(1525), their radial excitations a_2(1660), f_2(1640), f_2(1800) as well as ^3F_2 q\bar q...
Combined analysis of meson channels with I = 1, C = -1 from 1940-MeV to 2410-MeV (2002)
Anisovich, A V, Nikonov, V A, Sarantsev, A V, Sarantsev, V V, Baker, C A, Batty, C J, ...
I = 0, C = -1 mesons from 1940-MeV to 2410-MeV (2002)
Anisovich, A V, Nikonov, V A, Sarantsev, A V, Sarantsev, V V, Baker, C A, Batty, C J, ...
Anisovich, A. V., Anisovich, V. V., Nikonov, V. A.
We perform simultaneous calculations of the radiative decays of scalar mesons f_0(980)-> \gamma\gamma, a_0(980)-> \gamma\gamma, vector meson \phi(1020)-> \gamma f_0(980), \gamma a_0(980), \gamma...
Moment-operator expansion for the two-meson, two-photon and fermion-antifermion states (2001)
Anisovich, A. V., Anisovich, V. V., Markov, V. N., Matveev, M. A., Sarantsev, A. V.
A complete set of formulae in terms of the moment-operator expansion is presented for the two-meson, two-photon and fermion-antifermion states that can be used in the analysis of scalar (S) and...
Quark/gluon content of eta(1295) and eta(1440) (2001)
The quark/gluon content of eta(1295) and eta(1440) mesons is discussed, mesons being considered as members of the first radial excitation 2^1S_0 qqbar nonet. Recent results on eta(1295) and eta(1440)...
Study of anti-p p --> eta eta pi0 pi0 in flight (2001)
Anisovich, A V, Baker, C A, Batty, C J, Bugg, D V, Nikonov, V A, Sarantsev, A V, ...
Resonances in anti-p p --> omega eta from 600-MeV/c to 1940-MeV/c (2001)
Anisovich, A V, Baker, C A, Batty, C J, Bugg, D V, Nikonov, V A, Sarantsev, A V, ...
Resonances in anti- p p --> omega pi0 with masses 1960-MeV to 2410-MeV (2001)
Anisovich, A V, Baker, C A, Batty, C J, Bugg, D V, Nikonov, V A, Sarantsev, A V, ...
Resonances in anti-p p --> omega eta pi0 in the mass range 1960-MeV to 2410-MeV (2001)
Anisovich, A V, Baker, C A, Batty, C J, Bugg, D V, Nikonov, V A, Sarantsev, A V, ...
Partial wave analysis of anti-p p annihilation channels in flight with I = 1, C = +1 (2001)
Anisovich, A V, Baker, C A, Batty, C J, Bugg, D V, Nikonov, V A, Sarantsev, A V, ...
A partial wave analysis of anti-p p --> eta eta pi0 (2001)
Anisovich, A V, Baker, C A, Batty, C J, Bugg, D V, Nikonov, V A, Sarantsev, A V, ...
Anisovich, A. V., Anisovich, V. V., Nikonov, V. A.
Partial widths of the radiative decays $\phi(1020)\to\gamma f_0(980)$, $\gamma\eta$, $\gamma\eta'$, $\gamma\pi^0$ and $f_0(980)\to\gamma\gamma$ are calculated assuming all mesons under consideration...
Systematics of q anti-q states in the (n,M^2) and (J,M^2) planes (2000)
Anisovich, A. V., Anisovich, V. V., Sarantsev, A. V.
In the mass region up to M < 2400 MeV we systematise mesons on the plots (n,M^2) and (J,M^2), thus setting their classification in terms of n^{2S+1}L_J q anti-q states. The trajectories on the...
A J(PC) = 0-+ enhancement at the f0(980) eta threshold (2000)
Anisovich, A V, Baker, C A, Batty, C J, Bugg, D V, Hodd, C, Nikonov, V A, ...
Partial wave analysis of anti-p p --> pi- pi+, pi0 pi0, eta eta and eta eta' (2000)
Anisovich, A V, Nikonov, V A, Sarantsev, A V, Sarantsev, V V, Baker, C A, Batty, C J, ...
Data on anti-p p --> pi0 pi0, eta eta and eta eta' from 600-MeV/c to 1940-MeV/c (2000)
Anisovich, A V, Nikonov, V A, Sarantsev, A V, Sarantsev, V V, Baker, C A, Batty, C J, ...
Resonances in anti-p p --> omega pi0 pi0 from 600-MeV/c to 1940-MeV/c (2000)
Anisovich, A V, Nikonov, V A, Sarantsev, A V, Sarantsev, V V, Baker, C A, Batty, C J, ...
Three I = 0 J/(PC) = 2-+ mesons (2000)
Anisovich, A V, Nikonov, V A, Sarantsev, A V, Sarantsev, V V, Baker, C A, Batty, C J, ...
Evidence for omega' --> omega sigma and b1(1235) pi (2000)
Anisovich, A V, Baker, C A, Batty, C J, Bugg, D V, Hidas, P, Hodd, C, ...
Data on anti-p p --> eta' pi0 pi0 for masses 1960-MeV/c**2 to 2410-MeV/c**2 (2000)
Anisovich, A V, Baker, C A, Batty, C J, Bugg, D V, Hodd, C, Nikonov, V A, ...
I = 0 C = +1 mesons from 1920-MeV to 2410-MeV (2000)
Anisovich, A V, Baker, C A, Batty, C J, Bugg, D V, Hodd, C, Lu, H C, ...
A study of anti-p p --> eta eta eta for masses 1960-MeV/c**2 to 2410-MeV/c**2 (2000)
Anisovich, A V, Baker, C A, Batty, C J, Bugg, D V, Nikonov, V A, Sarantsev, A V, ...
Anisovich, A. V., Sadovnikova, V. A.
The nucleon-nucleon interaction in the region of the nucleon kinetic energy up to 1000 MeV is analysed together with the reaction $\gamma d \to pn$ in the photon energy range $E_{\gamma}=0-400$ MeV....
Partial widths for the decays eta(1295) -> gamma gamma and eta(1440) -> gamma gamma (1999)
Anisovich, A. V., Anisovich, V. V., Montanet, L., Nikonov, V. A.
We discuss gamma gamma partial widths of pseudoscalar/isoscalar mesons eta(M) in the mass region M = 1000-1500 MeV. The transition amplitudes eta(1295) -> gamma gamma and eta(1440) -> gamma gamma are...
Anisovich, A. V., Anisovich, V. V.
We calculate the $00^{++}$-wave two-meson spectra for the reactions $\gamma\gamma\to\pi^0\pi^0$, $\gamma\gamma\to\pi^+\pi^-$, $\gamma\gamma\to K^0\bar K^0$ and $\gamma\gamma\to K^+ K^-$ on the basis...
Anisovich, A. V., Anisovich, V. V., Bugg, D. V., Nikonov, V. A.
We calculate partial widths for the decays a_0(980)\to\gamma\gamma and f_0(980)\to\gamma\gamma under the assumption that a_0(980) and f_0(980) are members of the basic 1^3P_0 q\bar q nonet. The...
Study of the process anti-p p --> eta eta pi0 from 1350-MeV/c to 1940-MeV/c (1999)
Anisovich, A V, Nikonov, V A, Sarantsev, A V, Sarantsev, V V, Baker, C A, Batty, C J, ...
Anti-p p --> pi0 eta and pi0 eta' from 600-MeV/c to 1940-MeV/c (1999)
Crystal Barrel Collaboration, Anisovich, A V, Nikonov, V A, Sarantsev, A V, Sarantsev, V V, Baker, C A, ...
Study of anti-p p --> pi0 pi0 eta from 600-MeV/c to 1940-MeV/c (1999)
Crystal Barrel Collaboration, Anisovich, A V, Nikonov, V A, Sarantsev, A V, Sarantsev, V V, Baker, C A, ...
Resonances in anti-p p --> f2(1270) pi (1999)
Crystal Barrel Collaboration, Anisovich, A V, Nikonov, V A, Sarantsev, A V, Sarantsev, V V, Baker, C A, ...
Resonances formed by anti-p p and decaying into pi0 pi0 eta for masses 1960-MeV to 2410-MeV (1999)
Anisovich, A V, Baker, C A, Batty, C J, Bugg, D V, Hodd, C, Kisiel, J, ...
Anti-p p --> pi0 pi0 from 600-MeV/c to 1940-MeV/c (1999)
Anisovich, A V, Nikonov, V A, Sarantsev, A V, Sarantsev, V V, Baker, C A, Batty, C J, ...
Anti-p p --> eta eta and eta eta' from 600-MeV/c to 1940-MeV/c (1999)
Anisovich, A V, Nikonov, V A, Sarantsev, A V, Sarantsev, V V, Baker, C A, Batty, C J, ...
The rho mass, width and line-shape in p-bar p annihilation at rest into pi+ pi- pi0 (1999)
Abele, A, Adomeit, J, Amsler, C, Anisovich, A V, Baker, C A, Barnett, B M, ...
Analysis of anti-p p --> pi- pi+, pi0 pi0, eta eta and eta eta' from threshold to 2.5-GeV/c (1999)
Anisovich, A V, Nikonov, V A, Sarantsev, A V, Sarantsev, V V, Baker, C A, Batty, C J, ...
Anisovich, A V, Baker, C A, Batty, C J, Bugg, D V, Hodd, C, Kisiel, J, ...
Anisovich, A. V., Sarantsev, A. V.
A K-matrix re-analysis of the K-pi S-wave is performed in the mass region 900-2100 MeV, and solutions which describe the data well are found. The solution with two resonances in the (IJ^P=1/2...
Scalar glueball: analysis of the (IJ^{PC}=00^{++})-wave (1997)
Anisovich, A. V., Anisovich, V. V., Sarantsev, A. V.
Basing on the previously performed K-matrix analysis of experimental data, we investigate, in the framework of the propagator matrix (D-matrix) technique, the 1100-1900 MeV mass region, where...
$0^{++}$-Glueball/$q \bar q$-State Mixing in the Mass Region near 1500 MeV (1996)
Anisovich, A. V., Anisovich, V. V., Sarantsev, A. V.
Basing on the results of the K-matrix fit of $(IJ^{PC}=00^{++})$ wave, we analyze the analytic structure of the amplitude and $q \bar q$/glueball content of resonances in the mass region 1200-1900...
During several years the data on different channels ppbar (J^{PC}=0^{-+}) --> 3 mesons presented by Crystal Barrel Collaboration were successfully analyzed by extracting the leading amplitude...
Anisovich, A. V., Anisovich, V. V., Prokoshkin, Yu. D., Sarantsev, A. V.
We summarize the results of the investigation of the $IJ^{PC}=00^{++}$ wave which is devoted to the search for the lightest scalar glueball. In the framework of the K-matrix formalism, the $q\bar...
Dispersive analysis of the decay eta -> 3 pi (1996)
Anisovich, A. V., Leutwyler, H.
We demonstrate that the decay eta -> 3 pi represents a sensitive probe for the breaking of chiral symmetry by the quark masses. The transition amplitude is proportional to the mass ratio...