In this study,we reanalyze the top-quark pair production at next-to-next-to-leading order(NNLO)in quantum chromodynamics(QCD)at future e^(+)e^(−)colliders using the Principle of Maximum Conformality(PMC)method.The PMC...In this study,we reanalyze the top-quark pair production at next-to-next-to-leading order(NNLO)in quantum chromodynamics(QCD)at future e^(+)e^(−)colliders using the Principle of Maximum Conformality(PMC)method.The PMC renormalization scales inαs are determined by absorbing the non-conformalβterms by recursively using the Renormalization Group Equation(RGE).Unlike the conventional scale-setting method of fixing the scale at the center-of-mass energyμ_(r)=√s,the determined PMC scale Q_(⋆)is far smaller than the √sand increases with the √s,yielding the correct physical behavior for the top-quark pair production process.Moreover,the convergence of the pQCD series for the top-quark pair production is greatly improved owing to the elimination of the renormalon divergence.For a typical collision energy of √s=500 GeV,the PMC scale is Q_(⋆)=107 GeV;the QCD correction factor K for conventional results is K∼1+0.1244+0.0102+0.0012−0.0087−0.0011+0.0184−0.0086+0.0002+0.0061−0.0003,where the first error is caused by varying the scaleμr∈[√s/2,2√s]and the second error is from the top-quark massΔm_(t)=±0.7 GeV.After applying the PMC,the renormalization scale uncertainty is eliminated,and the QCD correction factor K is improved to K∼1+0.1507_(−0.0015)^(+0.0015)−0.0057_(−0.0000)^(+0.0001),where the error is from the top-quark massΔm_(t)=±0.7 GeV.The PMC improved predictions for the top-quark pair production are helpful for detailed studies of the properties of the top-quark at future e^(+)e^(−)colliders.展开更多
目的探讨原发性高血压患者血压昼夜节律、B型脑钠肽(BNP)与左心室肥厚(LVH)的关系。方法纳入349例原发性高血压患者(74例有LVH,275例无LVH)进行超声心动图检测及24 h动态血压监测,计算左心室重量指数(LVMI)、夜间血压下降率、24 h动脉脉...目的探讨原发性高血压患者血压昼夜节律、B型脑钠肽(BNP)与左心室肥厚(LVH)的关系。方法纳入349例原发性高血压患者(74例有LVH,275例无LVH)进行超声心动图检测及24 h动态血压监测,计算左心室重量指数(LVMI)、夜间血压下降率、24 h动脉脉压(24 h PP)及动态脉压指数(PPI)。根据昼夜血压变异性将研究对象分为超杓型组(n=7)、杓型组(n=77)、非杓型组(n=173)及反杓型组(n=92)。采集患者一般资料及空腹血样,测定血糖、血脂、血尿素氮、血肌酐、胱抑素C、血尿酸及BNP水平。结果 LVH高血压的3级高血压所占比例(85.1%比46.9%;χ~2=34.428,P<0.001)、24 h平均收缩压(134 mm Hg比129 mm Hg;t=3.175,P=0.002)(1 mm Hg=0.133 k Pa)、白天平均收缩压(134 mm Hg比130 mm Hg;t=2.197,P=0.029)、夜间平均收缩压(132 mm Hg比121 mm Hg;t=4.763,P<0.001)、24 h PP(57 mm Hg比52 mm Hg;t=4.120,P<0.001)及PPI(0.43比0.41;t=3.335,P=0.001)均显著高于非LVH高血压患者,而夜间血压下降率[(1.30±8.02)%比(5.68±7.25)%;t=-4.510,P<0.001]显著低于对照组。LVH高血压患者BNP(87.8 pg/ml比28.8 pg/ml;t=2.170,P=0.034)和LVMI(135.1 g/m^2比88.7 g/m^2;t=15.285,P<0.001)均显著高于非LVH患者。超杓型组、杓型组、非杓型组及反杓型组高血压患者的BNP水平差异无统计学意义(P=0.137),而LVMI差异有统计学意义(P=0.001),其中反杓型组患者的LVMI显著高于杓型组(100.3 g/m^2比86.3 g/m^2;t=4.335,P<0.001)和非杓型组(100.3 g/m^2比93.7 g/m^2;t=1.987,P=0.048),非杓型组患者的LVMI显著高于杓型组(93.7 g/m^2比86.3 g/m^2;t=2.693,P=0.008)。多因素线性相关及Logistic回归分析显示,BNP和高血压分级水平与LVMI相关。结论高血压LVH与血压昼夜节律减弱或消失、血压分级水平密切相关,并伴随血浆BNP升高。展开更多
基金the Natural Science Foundation of China(12175025,12147102,12265011)by the Projects of Guizhou Provincial Department(YQK[2023]016,ZK[2023]141,[2020]1Y027,GZMUZK[2022]PT01)。
文摘In this study,we reanalyze the top-quark pair production at next-to-next-to-leading order(NNLO)in quantum chromodynamics(QCD)at future e^(+)e^(−)colliders using the Principle of Maximum Conformality(PMC)method.The PMC renormalization scales inαs are determined by absorbing the non-conformalβterms by recursively using the Renormalization Group Equation(RGE).Unlike the conventional scale-setting method of fixing the scale at the center-of-mass energyμ_(r)=√s,the determined PMC scale Q_(⋆)is far smaller than the √sand increases with the √s,yielding the correct physical behavior for the top-quark pair production process.Moreover,the convergence of the pQCD series for the top-quark pair production is greatly improved owing to the elimination of the renormalon divergence.For a typical collision energy of √s=500 GeV,the PMC scale is Q_(⋆)=107 GeV;the QCD correction factor K for conventional results is K∼1+0.1244+0.0102+0.0012−0.0087−0.0011+0.0184−0.0086+0.0002+0.0061−0.0003,where the first error is caused by varying the scaleμr∈[√s/2,2√s]and the second error is from the top-quark massΔm_(t)=±0.7 GeV.After applying the PMC,the renormalization scale uncertainty is eliminated,and the QCD correction factor K is improved to K∼1+0.1507_(−0.0015)^(+0.0015)−0.0057_(−0.0000)^(+0.0001),where the error is from the top-quark massΔm_(t)=±0.7 GeV.The PMC improved predictions for the top-quark pair production are helpful for detailed studies of the properties of the top-quark at future e^(+)e^(−)colliders.
文摘目的探讨原发性高血压患者血压昼夜节律、B型脑钠肽(BNP)与左心室肥厚(LVH)的关系。方法纳入349例原发性高血压患者(74例有LVH,275例无LVH)进行超声心动图检测及24 h动态血压监测,计算左心室重量指数(LVMI)、夜间血压下降率、24 h动脉脉压(24 h PP)及动态脉压指数(PPI)。根据昼夜血压变异性将研究对象分为超杓型组(n=7)、杓型组(n=77)、非杓型组(n=173)及反杓型组(n=92)。采集患者一般资料及空腹血样,测定血糖、血脂、血尿素氮、血肌酐、胱抑素C、血尿酸及BNP水平。结果 LVH高血压的3级高血压所占比例(85.1%比46.9%;χ~2=34.428,P<0.001)、24 h平均收缩压(134 mm Hg比129 mm Hg;t=3.175,P=0.002)(1 mm Hg=0.133 k Pa)、白天平均收缩压(134 mm Hg比130 mm Hg;t=2.197,P=0.029)、夜间平均收缩压(132 mm Hg比121 mm Hg;t=4.763,P<0.001)、24 h PP(57 mm Hg比52 mm Hg;t=4.120,P<0.001)及PPI(0.43比0.41;t=3.335,P=0.001)均显著高于非LVH高血压患者,而夜间血压下降率[(1.30±8.02)%比(5.68±7.25)%;t=-4.510,P<0.001]显著低于对照组。LVH高血压患者BNP(87.8 pg/ml比28.8 pg/ml;t=2.170,P=0.034)和LVMI(135.1 g/m^2比88.7 g/m^2;t=15.285,P<0.001)均显著高于非LVH患者。超杓型组、杓型组、非杓型组及反杓型组高血压患者的BNP水平差异无统计学意义(P=0.137),而LVMI差异有统计学意义(P=0.001),其中反杓型组患者的LVMI显著高于杓型组(100.3 g/m^2比86.3 g/m^2;t=4.335,P<0.001)和非杓型组(100.3 g/m^2比93.7 g/m^2;t=1.987,P=0.048),非杓型组患者的LVMI显著高于杓型组(93.7 g/m^2比86.3 g/m^2;t=2.693,P=0.008)。多因素线性相关及Logistic回归分析显示,BNP和高血压分级水平与LVMI相关。结论高血压LVH与血压昼夜节律减弱或消失、血压分级水平密切相关,并伴随血浆BNP升高。
