标题： LEP2的粒子物理标准模型结果 显示英文标题

标题： Standard Model Physics Results from LEP2

摘要： 在LEP2上，许多标准模型预测在质心系能量高达209 GeV的范围内被检验。费米子对产生截面和不对称性在整个能量范围内与理论预期相符。这些测量用于确定光子/Z玻色子干涉，并搜索高达20 TeV的接触相互作用。单W、ZZ和W+W-产生的截面与预期相符。W玻色子衰变为强子和轻子的分支比以及CKM矩阵元|V_{cs}|也被确定。给出了W粒子质量与宽度的精确测量，结果为MW=80.427+-0.046 GeV和GammaW=2.12=_0.11 GeV。所有电弱数据都与标准模型预测非常一致。在使用Delta alpha_{有}^(5)(s)的最新值进行联合拟合时，希格斯玻色子的质量被限制为MH=88^{+60}_{-37} GeV。 显示英文摘要

摘要： At LEP2 many Standard Model predictions are tested up to centre-of-mass energies of 209 GeV. Fermion pair production cross sections and asymmetries agree well with the theoretical expectation over the entire energy range. The measurements are used to determine the gamma/Z interference and to search for contact interactions up to 20 TeV. The cross sections for single-W, ZZ and W+W- production agree well with the expectations. The branching fractions of the W boson into hadrons and leptons are determined as well as the CKM matrix element |V_{cs}|. Precise measurements of the W mass and width are presented yielding MW=80.427+-0.046 GeV and GammaW=2.12=_0.11 GeV. All electroweak data are very consistent with the Standard Model predictions. In a combined fit using the recent value of Delta alpha_{had}^(5)(s) the mass of the Higgs boson is constrained to MH=88^{+60}_{-37} GeV.