Joint Institute for Nuclear Research, Dubna, Russia.
Phys Rev Lett. 2009 Dec 4;103(23):231802. doi: 10.1103/PhysRevLett.103.231802.
We present a direct measurement of the width of the W boson using the shape of the transverse mass distribution of W --> enu candidate events. Data from approximately 1 fb(-1) of integrated luminosity recorded at square root of s = 1.96 TeV by the D0 detector at the Fermilab Tevatron pp collider are analyzed. We use the same methods and data sample that were used for our recently published W boson mass measurement, except for the modeling of the recoil, which is done with a new method based on a recoil library. Our result, 2.028 +/- 0.072 GeV, is in agreement with the predictions of the standard model.
我们通过测量 W 玻色子到 enu 的横质量分布形状，给出了 W 玻色子宽度的直接测量结果。该结果基于费米实验室 Tevatron 对撞机上的 D0 探测器在质心系能量为(\sqrt{s}=1.96) TeV 下收集的约 1 fb^{-1}积分亮度数据得到。我们使用了与最近发表的 W 玻色子质量测量相同的方法和数据样本，除了使用新的基于反冲库的方法来模拟反冲，这是我们的结果为 2.028(\pm)0.072 GeV，与标准模型的预测相符。
