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sqrt{s} = 161 - 209 GeV e+e碰撞中W玻色子质量和宽度的测量

Measurement of the Mass and Width of the W Boson in e+e- Collisions at sqrt{s} = 161 - 209 GeV

The DELPHI Collaboration, J. Abdallah

摘要:

DELPHI合作利用LEP 2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。数据样本的积分亮度为660 pb^-1,收集的质心能量范围为161至209 GeV。在W+W-> lvqq和W+W-> qqqq两个通道中,通过应用由W的衰变产物直接重建W的质量的方法得到了结果。组合数据集的W质量结果为M_W = 80.336 +/- 0.055(Stat.)+/- 0.028(系统)+/- 0.025(FSI)+/- 0.009(LEP)GeV/c^2,其中FSI表示qqqq通道中末态相互作用效应引起的不确定性,LEP表示由加速器碰撞能量的知识引起的不确定性。W宽度的组合值为Gamma_W = 2.404 +/- 0.140(统计)+/- 0.077(系统)+/- 0.065(FSI)GeV/c^2。这些结果取代了以前由DELPHI协作发布的所有值。这篇文章是为了纪念卡洛·卡索。

英文摘要:

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- -> lvqq and W+W- -> qqqq channels. The W mass result for the combined data set is M_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 qqqq channel, and LEP represents that arising from the knowledge of the collision energy of the accelerator. The combined value for the W width is Gamma_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. This paper is dedicated to the memory of Carlo Caso.

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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