在质心能量为1.8 TeV的质子-反质子碰撞中对W玻色子宽度的直接测量。

Direct measurement of the W boson width in p&pmacr; collisions at radicals = 1.8 TeV.

作者信息

Theriot D, Thurman-Keup R, Tipton P, Tkaczyk S, Tollefson K, Tollestrup A, Toyoda H, Trischuk W, Tseng J, Turini N, Ukegawa F, Vaiciulis T, Valls J, Vejcik S, Velev G, Vidal R, Vilar R, Volobouev I, Vucinic D, Wagner RG, Wagner RL, Wahl J, Wallace NB, Walsh AM, Wang C

机构信息

Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.

出版信息

Phys Rev Lett. 2000 Oct 16;85(16):3347-52. doi: 10.1103/PhysRevLett.85.3347.

DOI:10.1103/PhysRevLett.85.3347

PMID:11030893

Abstract

This Letter describes a direct measurement of the W boson total decay width, gamma(W), using the Collider Detector at Fermilab. The measurement uses an integrated luminosity of 90 pb(-1), collected during the 1994-1995 run of the Fermilab Tevatron p&pmacr; collider. The width is determined by normalizing predicted signal and background distributions to 49 844 W-->enu candidates and 21 806 W-->&mgr;nu candidates in the transverse-mass region M(T)<200 GeV and then fitting the predicted shape to the 438 electron events and 196 muon events in the high- M(T) region, 100<M(T)<200 GeV. The result is gamma(W) = 2.04+/-0.11(stat)+/-0.09(syst) GeV.

摘要

这封信描述了使用费米实验室的对撞机探测器对W玻色子总衰变宽度Γ(W)进行的直接测量。该测量使用了在费米实验室Tevatron质子-反质子对撞机1994 - 1995年运行期间收集的90皮靶⁻¹的积分亮度。宽度是通过将预测的信号和背景分布归一化为横向质量区域M(T)<200 GeV内的49844个W→enu候选事例和21806个W→μν候选事例，然后将预测形状拟合到高M(T)区域100<M(T)<200 GeV内的438个电子事例和196个μ子事例来确定的。结果是Γ(W)=2.04±0.11(统计)±0.09(系统) GeV。