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arXiv 0710.4112hep-ex
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TeV = 1.96时ppbar碰撞中W玻色子宽度的直接测量

A direct Measurement of the W Boson Width in ppbar Collisions at sqrt(s) = 1.96 TeV

CDF Collaboration, T. Aaltonen

摘要:

本文利用费米实验室Tevatron上CDF Ⅱ探测器在sqrt(s)= 1.96TeV的ppbar碰撞中获得的350 pb ~(-1)的数据,直接测量了W玻色子G_W的总衰变宽度。通过将预测的信号和背景分布归一化到230185 W候选者,然后将预测的形状拟合到高M_T区域(90 <M_T < 200 GeV)中的6055个事件,来确定宽度。结果是G_W = 2032 +/- 45(stat.)+/- 57(系统)MeV,与标准模型预期一致。

英文摘要:

A direct measurement of the total decay width of the W boson G_W is presented using 350 pb-1 of data from ppbar collisions at sqrt(s) = 1.96 TeV collected with the CDF II detector at the Fermilab Tevatron. The width is determined by normalizing predicted signal and background distributions to 230185 W candidates decaying to enu and munu in the transverse-mass region 50 < M_T < 90 GeV and then fitting the predicted shape to 6055 events in the high-M_T region, 90 < M_T < 200 GeV. The result is G_W = 2032 +/- 45 (stat.) +/- 57 (syst.) MeV, consistent with the standard model expectation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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