The form factors of B(s)decays into P-wave excited charmed mesons(including D∗0(2300),D1(2430),D1(2420),D∗2(2460)and their strange counterparts,denoted generically as D∗∗(s))are systematically calculated via QCD sum r...The form factors of B(s)decays into P-wave excited charmed mesons(including D∗0(2300),D1(2430),D1(2420),D∗2(2460)and their strange counterparts,denoted generically as D∗∗(s))are systematically calculated via QCD sum rules in the framework of heavy quark effective field theory(HQEFT).We consider contributions up to the next leading order of heavy quark expansion and give all the relevant form factors,including the scalar and tensor ones only relevant for possible new physics effects.The expressions for the form factors in terms of several universal wave functions are derived via heavy quark expansion.These universal functions can be evaluated through QCD sum rules.Then,the numerical results of the form factors are presented.With the form factors given here,a model independent analysis of relevant semileptonic decays B(s)→D∗∗(s)lν¯l is performed,including the contributions from possible new physics effects.Our predictions for the differential decay widths,branching fractions,and ratios of branching fractions R(D∗∗(s))may be tested in more precise experiments in the future.展开更多
目的分析全血IFN-γ释放试验在猕猴分枝杆菌检测中的应用价值。方法首先测定结核菌素试验(TST)阳性、阴性猕猴血清样本的基础IFN-γ含量。然后以PBS为对照,200 IU bovine-PPD为刺激抗原,分别与TST阴性和阳性猕猴肝素抗凝血共培养约24 h...目的分析全血IFN-γ释放试验在猕猴分枝杆菌检测中的应用价值。方法首先测定结核菌素试验(TST)阳性、阴性猕猴血清样本的基础IFN-γ含量。然后以PBS为对照,200 IU bovine-PPD为刺激抗原,分别与TST阴性和阳性猕猴肝素抗凝血共培养约24 h,收集血浆,测定IFN-γ含量。通过分析抗原刺激前后血浆IFN-γ含量变化和刺激指数探讨全血IFN-γ释放试验的诊断效能。结果 TST阳性猕猴血清基础IFN-γ含量明显高于TST阴性猕猴,但离散度都较大。PPD刺激前后,TST阴性猕猴血浆IFN-γ含量无明显变化,而TST阳性猕猴血浆IFN-γ含量明显升高(P<0.01)。刺激指数结果显示,TST阳性猕猴明显高于TST阴性猴(P<0.01)。ROC曲线分析表明,血浆IFN-γ含量和刺激指数均可作为全血IFN-γ释放试验的评价指标。结论本研究基于小样本量的实验结果证实,全血IFN-γ释放试验是猕猴分枝杆菌快速诊断的有益补充方法。展开更多
基金the National Natural Science Foundation of China(12147214)。
文摘The form factors of B(s)decays into P-wave excited charmed mesons(including D∗0(2300),D1(2430),D1(2420),D∗2(2460)and their strange counterparts,denoted generically as D∗∗(s))are systematically calculated via QCD sum rules in the framework of heavy quark effective field theory(HQEFT).We consider contributions up to the next leading order of heavy quark expansion and give all the relevant form factors,including the scalar and tensor ones only relevant for possible new physics effects.The expressions for the form factors in terms of several universal wave functions are derived via heavy quark expansion.These universal functions can be evaluated through QCD sum rules.Then,the numerical results of the form factors are presented.With the form factors given here,a model independent analysis of relevant semileptonic decays B(s)→D∗∗(s)lν¯l is performed,including the contributions from possible new physics effects.Our predictions for the differential decay widths,branching fractions,and ratios of branching fractions R(D∗∗(s))may be tested in more precise experiments in the future.
文摘目的分析全血IFN-γ释放试验在猕猴分枝杆菌检测中的应用价值。方法首先测定结核菌素试验(TST)阳性、阴性猕猴血清样本的基础IFN-γ含量。然后以PBS为对照,200 IU bovine-PPD为刺激抗原,分别与TST阴性和阳性猕猴肝素抗凝血共培养约24 h,收集血浆,测定IFN-γ含量。通过分析抗原刺激前后血浆IFN-γ含量变化和刺激指数探讨全血IFN-γ释放试验的诊断效能。结果 TST阳性猕猴血清基础IFN-γ含量明显高于TST阴性猕猴,但离散度都较大。PPD刺激前后,TST阴性猕猴血浆IFN-γ含量无明显变化,而TST阳性猕猴血浆IFN-γ含量明显升高(P<0.01)。刺激指数结果显示,TST阳性猕猴明显高于TST阴性猴(P<0.01)。ROC曲线分析表明,血浆IFN-γ含量和刺激指数均可作为全血IFN-γ释放试验的评价指标。结论本研究基于小样本量的实验结果证实,全血IFN-γ释放试验是猕猴分枝杆菌快速诊断的有益补充方法。
