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While the standard model is the most successful theory to describe all the interactions and constituents of elementary particle physics,it has been constantly scrutinized for over four decades.Weak decays of charm quarks can be used to measure the coupling strength between quarks in different families and serve as an ideal probe for CP violation.As the lowest charm-strange baryons with three different flavors,Ξ;baryons(composed of csu or csd)have been extensively studied in experiments.In this study,we use state-of-the-art lattice QCD techniques to generate 2+1 clover fermion ensembles with two lattice spacings,a=(0.108,0.080 fm).Then,we present the first ab-initio lattice QCD calculation of the Ξ;→Ξ form factors.Our theoretical results for the Ξc→Ξl;v;decay widths are consistent with and approximately two times more precise than the latest measurements by the ALICE and Belle collaborations.Based on the latest experimental measurements,we independently obtain the quark-mixing matrix element |V;|,which is in good agreement with results from other theoretical approaches. 相似文献
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CountablyCompactPropertyofG(H∞)SunWei(孙玮)(DepartmentofMathematics,SichuanUnionUniversity,Chengdu,610064andInstituteofAppliedM... 相似文献
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大豆二羟异黄酮及三羟异黄酮的高效液相色谱分析 总被引:5,自引:0,他引:5
1mol/L盐酸水解大豆及豆制品,乙腈提取,高效液相色谱分析了二羟、三羟异黄酮的含量。以甲醇-2mmol/L乙酸铵(体积比55:45,乙酸铵溶液用乙酸调pH至4.380)为流动相,Hypersil BDS C18色谱分析柱,柱温25℃,260nm紫外检测波长进行分析。二羟、三羟异黄酮的1-500μmol/L的范围内,与峰面积有很好的线性关系 (r=0.9999)。它们的检出限为5ng(S/N=3),平均回收率94.46%以上,6次进样的相对标准差(RSD)小于4%。该法灵敏、重复性好、结果准确、分析迅速。检测大豆及豆制品中异黄酮的含量,得到满意的结果。 相似文献
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兔膝关节炎模型的关节软骨及软骨下骨 ,经盐酸水解 ,纤维素CF11分离吡啶诺林 (Pyr) ,高效液相色谱测定其含量 ;采用 μBondapakC18 柱 (10μm,3.9mm×300mm) ,以V 乙腈∶V 水[0.5 %(φ)七氟正丁酸]=25∶75为流动相,荧光检测器在λem 和λex 分别为390nm和297nm的条件下测定Pyr;在0.250~6.00μmol/L的范围内 ,Pyr含量与峰面积有良好的线性关系 ,r=0.9996 ,加标平均回收率是98 % ,相对标准差(n=6)是3.3 % ;样品测定结果显示 ,8周内 ,关节软骨中Pyr含量逐渐下降 ,软骨下骨中Pyr含量在早期下降 ,随后逐渐升高 ;骨胶原Pyr含量的变化是造成尿液Pyr升高的原因。 相似文献
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Theoretical Analysis of Ionic Autoionization Spectra of Lanthanum in the Energy Region of 90650—915—00cm^—1 下载免费PDF全文
Eigenquantum defects μα and transformation matrix Uiα of La are calculated from the first principles byrelativistic multichannel theory, and dipole matrix elements Dα are obtained by fitting the experimental spectra.With these parameters, ionic autoionization spectra of lanthanum via an intermediatestate (Xe)5d6d^-1 P1 of La . in the energy region of 90650-91500 cm^-1 are calculated within the framework of multichannel auantum defecttheory. Our calculated spectra are in general agreement with the experimental data. 相似文献
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孙玮 《应用数学学报(英文版)》1999,15(3):225-232
1.IntroductionactEbeaHa~tOPologicalspaceandmamdritemeasureonitsBorela-algebraB(E).In[11,MOSCointroducedthefollowingnow-calledMoscoconvergenceofsyllUnetricac~l~:tlf621i.t,..2.1].AsequenceofsynUnetricbilinearforms(En,D(en)),nEN,issaidtoMO8coconvergetoa... 相似文献
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