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...
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(...
(ΛQCD/mb)3.Today’sexperimentalinfor-mationontheB-mesonlifetimesisinagreementwiththeexpectationsfromtheHQE,butthepresenttheoreticalpredictionsstilldependon4poorlyknownhadronicparametersB1,B2,ε1andε2[2,3].RecentlytheyhavebeenobtainedbyQCDsumrules[4].LatticeresultsareexpectedsoonfromtheRomegroup[5]andwill...
Radiative decay modes of the D{sup 0} meson In this paper we describe a search for four radiative decay modes of the D{sup 0} meson: D{sup 0}{r_arrow}{phi}{gamma}, D{sup 0}{r_arrow}{omega}{gamma}, D{... DM Asner,J Gronberg,TS Hill,... - 《Physical Review D》 被引量...
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...
While for b → d transitions such five-body final states contribute at the same order in the Wolfenstein expansion compared to the three-body partonic decay, they are CKM suppressed in b → s decays. In the perturbative expansion, we include all leading-order contributions, as well as ...
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 ...
展开 关键词: n34140* --physics (high energy)--particle interactions & properties (experimental)--strong (meson-induced a2 resonances angular distribution bubble chambers decay elementary particles f resonances feynman diagram field theory gev range DOI...
It is natural that these opened channels not only result in the visible branch decay widths but also give contributions to the mass shifts of the corresponding charmonium. When the masses of the charmonium lie about the threshold of the meson pairs, one can expect that the nonrelativistic ...
The BESIII collaboration's observation of leptonic decay D+→τ+ντ fills an important gap in the standard model of particle physics, enabling new tests of the model. A key feature of the standard model is 'lepton universality," which mandates that the electron, muon and tau behave almost ...