16,764 research outputs found

    Multi-nucleon transfer in 58Ni+60Ni{}^{58}\text{Ni}+{}^{60}\text{Ni} and 60Ni+60Ni{}^{60} \text{Ni}+{}^{60}\text{Ni} in stochastic mean-field approach

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    The multi-nucleon exchange mechanism in 58Ni+60Ni{}^{58} \text{Ni}+{}^{60} \text{Ni} and 60Ni+60Ni{}^{60} \text{Ni}+{}^{60}\text{Ni} collisions is analyzed in the framework of the stochastic mean-field approach. The results of calculations are compared with the TDRPA calculations and the recent data of 58Ni+60Ni{}^{58} \text{Ni}+{}^{60} \text{Ni}. A good description of the data and a relatively good agreement with the TDRPA calculations are found.Comment: 6 pages, 6 figure

    The coupling constants g_{\rho\pi\gamma} and g_{\omega\pi\gamma} as derived from QCD sum rules}

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    We employ QCD sum rules to calculate the coupling constants gρπγ_{\rho\pi\gamma} and gωπγ_{\omega\pi\gamma} by studying the three point ρπγ{\rho\pi\gamma}- and ωπγ{\omega\pi\gamma}-correlation functions. Our results for the decay widths Γ(ρ0π0γ)\Gamma(\rho^0\to \pi^0\gamma) and Γ(ωπ0γ)\Gamma(\omega\to \pi^0\gamma) calculated using the obtained coupling constants are in good agreement with the experimental values of these decay widths

    The ωσγ\omega\sigma\gamma-vertex in light cone QCD sum rules

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    We investigate the ωσγ\omega\sigma\gamma-vertex and estimate the coupling constant gωσγ_{\omega\sigma\gamma} in the framework of the light cone QCD sum rules. We compare our result with the values of this coupling constant deduced from a phenomenological analysis of ωππγ\omega\to\pi\pi\gamma decays.Comment: 5 pages, RevTex, 1 Figur

    The ϕa0γ\phi a_0\gamma- and ϕσγ\phi\sigma\gamma-vertices in light cone QCD

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    We study ϕa0γ\phi a_0\gamma- and ϕσγ\phi\sigma\gamma-vertices in the framework of the light cone QCD sum rules and we estimate the coupling constants gϕa0γ_{\phi a_0\gamma} and gϕσγ_{\phi\sigma\gamma} utilizing ωϕ\omega\phi-mixing. We compare our results with the previous estimations of these coupling constants in the literature obtained from phenomenological considerations.Comment: 8 pages, RevTex, 2 figure

    The a0K+Ka_0K^+K^--vertex in light cone QCD sum rules

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    We investigate the a0K+Ka_0K^+K^--vertex in the framework of light cone QCD sum rules. We estimate the coupling constant ga0K+K_{a_0K^+K^-} which is an essential ingredient in the analysis of physical processes involving a0(980)a_0(980) meson. Our result is somewhat larger than the previous determinations of this coupling constant.Comment: 8 pages, 1 figur

    The decay ρ0π0π0γ\rho^{0}\to \pi^{0}\pi^{0}\gamma and the role of σ\sigma-meson

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    We study the radiative decay ρ0π0π0γ\rho^{0}\to\pi^{0}\pi^{0}\gamma within the framework of a phenomenological approach in which the contributions of σ\sigma-meson and ω\omega-meson intermediate states and of the pion-loops are considered. We conclude that the σ\sigma-meson amplitude provides the dominant contribution.Comment: 12 pages, LATEX, 3 PS figure

    Global analysis of solar neutrinos (assumed to be Majorana particles) together with the new KamLAND data

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    Assuming neutrinos are Majorana particles having non-zero transition magnetic moments, a global analysis of solar neutrino data, together with the new KamLAND data, is presented in the resonant spin flavor precession (RSFP) framework. The allowed regions from solar data combined with new KamLAND data are examined at 0.95 confidence level (CL). The electron antineutrino flux from the Sun is calculated, and via the results obtained several limits are set for muB.Comment: 13 pages, 6 figure
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