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471.
472.
用瞬时近似下的Bethe-Salpeter(B-S)方程,讨论了0-重介子束缚态.运用重味质量展开方法求解方程,计算了一级近似下D±,D0,B±,B0介子的质量,与实验数据和其它求解方法的计算结果作了比较. 相似文献
473.
利用夸克统计模型和强子产额的实验数据,研究了 反应中的夸克对产生率、奇异抑制因子和重子介子比,得到了这些量随能量的变化规律. 相似文献
474.
Laura Tedeschini-Lalli 《Journal of statistical physics》1982,27(2):365-388
A two-parameter family of nonlinear differential equations x=F(x, R, ) is studied, which allows one to connect continuously, as varies from zero to one, the different phenomenologies exhibited by a model of 5-mode truncated Navier-Stokes equations and by a 7-mode one extending it. A critical value is found for, at which the most significant phenomena of the 5-mode system either vanish or go to infinity. New phenomena arise then, leading to the 7-mode model.Supported by G.N.F.M., C.N.R. 相似文献
475.
LI Yong-Jiang XU Wang W.M.Snow CAI Xiao-Lu FAN Gong-Tao FAN Guang-Wei LUO Wen PAN Qiang-Yan XU Ben-Ji YANG Li-Feng YAN Zhe 《中国物理C(英文版)》2010,34(9)
The measurement of parity-violating(PV)observables in few-nucleon system can shed light on our current understanding of the week interaction between nucleons.Theoretical models describe the nucleonnucleon weak interaction at low energies use a series of undetermined parameters.Two parity violating measurements have been considered: the capture of polarized slow neutrons on hydrogen((n)+p→d+γ)at Los Alamos National Laboratory for first phase and Oka Ridge National Laboratory for second phase and the helicity dependence of the deuteron photodisintegration cross section using circularly polarized photons((γ)+d→n+p*)at Shanghai Institute of Applied Physics.The goal of both experiments is to constraint the weak meson-nucleon couplings to a precision of 1 × 10-8.The introduction of both experiments is presented. 相似文献
476.
H.E.Jackson 《中国物理C(英文版)》2010,34(9)
Results are presented from the Hermes experiment which uses semi-inclusive deep inelastic lepton scattering to study the flavor structure of the nucleon. Data have been accumulated for pion and kaon double spin asymmetries, single-spin azimuthal asymmetries for meson electroproduction, deep virtual Compton scattering (DVCS), and meson multiplicities. These results provide information on the properties of the strange sea in the proton, constraints on transverse momentum dependent quark parton distributions, and demonstrate the promise of DVCS for isolating the total angular momentum carried by the quarks in the proton. 相似文献
477.
We study the possible tetraquark interpretation of light scalar meson states a0(980), f0(980), κ,σ within the framework of the non-relativistic potential model. The wave functions of tetraquark states are obtained in a space spanned by multiple Gaussian functions. We find that the mass spectra of the light scalar mesons can be well accommodated in the tetraquark picture if we introduce a three-body quark interaction in the quark model. Using the obtained multiple Gaussian wave functions, the decay constants of tetraquarks are also calculated within the "fall apart" mechanism. 相似文献
478.
采用Gaussian求和规则计算Ds(0 )介子的质量.首先,通过Laplace变换得到了Ds(0 )介子流的两点函数以及谱函数的Gaussian变换;进而导出了关于Ds(0 )介子的质量与衰变常数的Gaussian求和规则;采用QCD标准的普适输入参数,得到了关于Ds(0 )介子质量与衰变常数的数值结果:mGauss=2.41±0.05±0.15 GeV和fGauss=0.30±0.02 GeV,所得的结果比Borel求和规则的结果(mBorel=2.48±0.03 GeV)要低,在理论计算误差范围内与Borel求和规则的结果相比更符合实验结果(mexp=2.317 6±0.001 3 GeV). 相似文献
479.
By employing the perturbative QCD (pQCD) factorization approach, we calculate the full leading and the partial next-to-leading order (NLO) contributions to the seven B→πη(') and η(')η(') decays. For B+B→π+η(') decays, the pQCD predictions for their decay rates agree very well with the data after the inclusion of the small NLO contributions. For neutral decays, the pQCD predictions are also consistent with the experimental upper limits and can be tested by the LHC experiments. The measured value of ACPdir(π±η)=-19±7% can also be accommodated by the pQCD approach. 相似文献
480.
ZHOU Hai-Qing 《中国物理C(英文版)》2009,33(12)
The results of two-boson-exchange effects in the parity-violating elastic electron-proton scattering are reported based on a simple hadronic model. The corrections are calculated including the nucleon and △(1232) intermediate states. And the numerical results are also compared with the recent results reported by other group and other methods. 相似文献