Measurement of the mass and width of the W boson in e+ e- collisions at √s=161-209 GeV
Measurement of the mass and width of the W boson in e+ e- collisions at √s=161-209 GeV
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DOI：
10.1140/epjc/s10052-008-0585-7
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发表时间：
2008-05-01
影响因子：
4.4
通讯作者：
Zupan, M.
中科院分区：
文献类型：
--
作者：
Abdallah, J.;Abreu, P.;Zupan, M.
Delphi合作利用在整个LEP2计划(1996-2000)期间收集的数据对W玻色子的质量和宽度进行了测量。数据样本的积分光度为660PB(-1)，是在161GeV到209GeV的质心能量范围内收集的。结果是通过在Barq‘通道上的W+W-->；L(Nu)和Barq’沟道上的W+W-->；q(Q)上的W+W-->；q(Q)中由其衰变产物直接重建W的质量而得到的。组合数据集的W质量结果为ISM-W=80.336+/-0.055(统计)+/-0.028(系统)+/-0.025(Fsi)+/-0.009(Lep)Gev/c(2)，其中fsi表示由于Barq‘通道上的q(Q)上的q(Q)中的最终状态相互作用效应引起的不确定性，而lep表示由知道加速器的碰撞能量引起的不确定性。W宽度的合并值为Gamma(W)=2.404+/-0.140(统计)+/-0.077(系统)+/-0.065(FSI)GeV/c(2)。这些结果取代了之前由德尔福合作发布的所有值。
A measurement of the W boson mass and width has been performed by the DELPHI collaboration using the data collected during the full LEP2 programme (1996-2000). The data sample has an integrated luminosity of 660 pb(-1) and was collected over a range of centre-of-mass energies from 161 to 209 GeV.Results are obtained by applying the method of direct reconstruction of the mass of the W from its decay products in both the W+W- -> l (nu) over bar (l) and W+W- -> q (q) over bar'(q) over barq'channels. The W mass result for the combined data set isM-W = 80.336 +/- 0.055(Stat.) +/- 0.028(Syst.) +/- 0.025(FSI) +/- 0.009(LEP) GeV/c(2) ,where FSI represents the uncertainty due to final state interaction effects in the q (q) over bar'(q) over barq' channel, and LEP represents that arising from the knowledge of the collision energy of the accelerator. The combined value for the W width isGamma(W) = 2.404 +/- 0.140(Stat.) +/- 0.077(Syst.) +/- 0.065(FSI) GeV/c(2).These results supersede all values previously published by the DELPHI collaboration.