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Simone Moretti (PG)10/09/2013, 14:05Using the Skyrme model for nucleons we test the possibility of determining nucleon form factors in the time-like region by an analytic continuation of space-like form factors with particular attention to the behavior at the nucleon-antinucleon production threshold.Go to contribution page
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Dr Andrey Shamov (Budker INP)10/09/2013, 14:05The available data on the D-D-bar cross section and the inclusive hadronic cross section in the psi(3770) region by BABAR, BELLE, BES, CLEO and KEDR experiments were analyzed assuming that the systematic uncertainties in cross sections measured by different detectors are not correlated. The three theoretical models were employed for the data analysis. The first model implies that the D-D-bar...Go to contribution page
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Mr Alexey Kiselev (Sobolev Institute for Mathematics)10/09/2013, 14:05The intensity of scalar $a_0(980)$, $f_0(980)$ and tensor $a_2(1320)$, $f_2(1270)$ mesons production at VEPP-2000 (BINP, Novosibirsk) and, possibly, the upgraded DA$\Phi$NE (Frascati, Italy) in the processes $e^+e^- \to a_0 (f_0$, $a_2$, $f_2) \gamma$ is calculated with the help of VDM and the kaon loop model (for scalar mesons case). The processes $e^+e^-\to a_2(f_2)\gamma$ have not...Go to contribution page
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Dr Genaro Toledo Sanchez (UNAM)10/09/2013, 14:05We determine the magnetic dipole moment of the rho meson using preliminary data from the BaBar Collaboration for the $e^{+} e^{-} \to \pi^+ \pi^- 2 \pi^0$ process, in the center of mass energy range from 0.9 to 2.2 GeV. We describe the $\gamma^* \to 4\pi$ vertex using a vector meson dominance model, including all intermediate resonance contributions. We find that ${\mu}_\rho = 2.1 \pm 0.5 \:...Go to contribution page
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Dr Sebastian P. Schneider (HISKP Uni Bonn)10/09/2013, 14:05Dispersion theoretical analyses of transition form factors are stepping stones to a model-independent determination of the light-by-light scattering contribution to $(g-2)_\mu$. We have performed such an analysis on the conversion decays of the lightest isoscalar vector mesons, $\omega/\phi\to\pi^0\ell^+\ell^-$. For that we resort to a dispersive analysis of the $V\to3\pi$ partial-wave...Go to contribution page
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Mr Sergii Raspopov10/09/2013, 14:05
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Dr Valery Lyuboshitz (Joint Institute for Nuclear Research ( Dubna ))10/09/2013, 14:05Using the technique of helicity amplitudes, the electromagnetic process e+e- --> mu+mu- is theoretically investigated in the onephoton approximation. The structure of the triplet states of the final mu+mu- system is analyzed. It is shown that in the case of unpolarized electron and positron the final muons are also unpolarized, but their spins are strongly correlated. Explicit expressions for...Go to contribution page
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Mauro Raggi (LNF)10/09/2013, 14:05The NA48/2 collaboration has analyzed 1.13 million charged kaon decays Ke4(+-) to pi+ pi- e nu leading to an improved determination of the Branching Fraction at percent level precision and detailed form factor studies. The hadronic form factors in the S- and P-wave and their variation with energy are obtained concurrently with the phase difference between the S- and P-wave states of the pi...Go to contribution page
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Dr Tomohito MAEDA (Nihon University)10/09/2013, 14:05The COMPASS collaboration, as a part of their hadron spectroscopy program, will measure the radiative decay widths of the light-quark mesons via the Primakoff reactions. In this work we study the photon couplings of light qqbar states applying the covariant oscillator quark model and evaluate the rates for the transitions; {rho, b1(1235), a1(1260), a2(1320), pi2(1670), rho3(1690), rho(1700)}...Go to contribution page
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Dr Valery Lyuboshitz (Joint Institute for Nuclear Research ( Dubna ))10/09/2013, 14:05The spin structure of the two-photon process gamma gamma --> e+ e- is theoretically investigated. It is shown that if the primary photons are unpolarized the final electron and positron are unpolarized as well but their spins are strongly correlated. Explicit expressions for the components of the correlation tensor of the final e+e- system are derived and the relative fractions of singlet...Go to contribution page
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Dr Andreas Nyffeler10/09/2013, 14:05We give an update on the current status of the hadronic light-by-light scattering contribution to the muon g-2. We review recent work by various groups, list some of the open problems and give an outlook on how to better control the uncertainty of this contribution. This is necessary in order to fully profit from planned future muon g-2 experiments to test the Standard Model.Go to contribution page
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Mr Andrey Sukharev (Budker INP)10/09/2013, 14:05Since 2004 KEDR detector at VEPP-4M collider has taken several data sets in psi(2s) region, acquiring total luminosity of about 7 pb^{-1}, which corresponds to more than 3.5 \times 10^6 psi(2s). There were 5 scans of the resonance allowing us to know the collider's energy spread and 5 runs where the data was taken at the psi(2s) peak and slightly below it. We report the value...Go to contribution page
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Dr Gennady Fedotovich10/09/2013, 14:05
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Mr Aleksandr Popov (Budker Institute Of Nuclear Physics (BINP))10/09/2013, 14:05The preliminary results of the e+e->P bapP cross section with CMD-3 detector at electron-positron collider VEPP-2000 in the c.m. energy range 1.92 - 2.0 GeV will be presented. Analysis based on 4.5 inversed picobarns of integrated luminosity, collected in first physical run of new facility. The events selection procedure based on the information from Drift Chamber and Calorimeters allowed...Go to contribution page
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Mr Pablo Roig Garces (IF (UNAM, Mexico))10/09/2013, 14:05We carry out a detailed study of the branching fractions and lepton pair invariant-mass spectrum of \tau^- ->\pi^- \nu_\tau l^+l^- decays (l=e,\mu). In addition to the model-independent (QED) contributions, we include the structure-dependent (SD) terms, which encode information on the hadronization of QCD currents. The form factors describing the SD contributions are evaluated by supplementing...Go to contribution page
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