Feynman diagramLifetimeParticle decayParticle widthsQuark modelForeign technologyERDA/645205The nonleptonic D meson decays are considered in the c-quark decay diagram model. The recent experimental data are used to estimate the widths of two- and quasi-two-body nonleptonic D decays. It is concluded...
2 Feynman diagram for leptonic decay (M → lν¯l ) the final state [51]. Charged mesons produced from a quark and antiquark can decay to a charged lepton pair when these objects annihilate via a virtual W ± boson as given in Fig. 2. The leptonic width of the D meson is ...
2 Variation of κds with K 2 smaller than G F αS √ /(9 2π 3 ) 9 × 10−9 indicating that BSS mechanism can not be the source of the strong phases in these decay modes. In fact this conclusion is also applied to all nonleptonic D meson decays into two mesons aris- ing ...
The nucleon-exchange contribution to backward-angle p-d scattering is evaluated as a Feynman diagram, in which the d-n-p vertex function is obtained from recent numerical solutions to a bound-state Bethe-Salpeter equation. Comparisons are made to experimental cross section and polarization data, ...
This mechanism has been applied successfully to absorb the infrared divergences in P-wave [1–3] and D-wave [4,5] decay widths of heavy quarkonia. In Ref. [6], the color-octet mechanism was introduced to account for the J= c production at the Tevatron, and the theoretical prediction ...
We also apply the pole model to calculate the Bq meson decay. The main contribution here is the radiative transition of the Bq meson into an intermediate (virtual)B∗. The Feynman diagram is shown in Fig.3.The subsequent process B∗→ν¯νis determined in SM by the e,ective Hamilt...
diffraction in CC DIS can shed more light on the QCD mechanism of diffractive meson production. At the same time, it is a new way to study the gluon structure of nucleons. We now consider the diffractive process(Fig. 1 ), ν µ +N →µ − +N ′ +D + s . (1) ...
decay chain衰变链 decay coefficient衰变常数 decay constant衰变常数 decay constant衰变常量 decay energy衰变能 decay factor衰变常数 decay fraction衰变分 decay heat removal system衰变热去除系统 decay heat衰变热 decay kinematics衰变运动学 decay out完全衰变 decay period冷却周期 decay power衰减功率 decay rate衰...
Fig. 1. Feynman diagrams for the two-body decay ⁎⁎Y(4260)→D⁎D¯⁎ in our scenario. In the framework of non-relativistic effective field theory (NREFT) the Lagrangians for the coupling vertices in Fig. 1 can be written as [7], [8], [19], [20](1)LYD1D¯=iyeff2(...
Charmed Meson ResonancesFeynman DiagramParticle WidthsQuarksWeak Hadronic DecayThe recent data on quasi-two-body weak nonleptonic decays D implies Krho, K* pi are discussed in terms of the simple model where C-quark decay diagrams dominate (the spectator model). The agreement of this model with...