Comment on the CMS search for charge-asyimmetric production of W boson in ttbar +jet events
Comment on the CMS search for charge-asyimmetric production of W boson in ttbar +jet events
复制标题
对 CMS 搜索 ttbar 喷气事件中 W 玻色子电荷不对称产生的评论
DOI：
10.1016/j.physletb.2012.12.011
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Sho Iwamoto
中科院分区：
文献类型：
--
作者：
Motoi Endo;Sho Iwamoto
本文对CMS寻找与顶夸克和下夸克耦合的W′玻色子的结果作了再分析。该模型的动机是Tevatron的结果对tt 'pair生产的前向后不对称性。在计算pp→tt <$j的理论截面时，SM和W′振幅之间的干扰效应被证明是重要的，尽管它在CMS分析中被忽略。在95%C. L时，W′玻色子的质量下限从840 GeV放宽到740 GeV.这是由于在横截面的首阶计算处的干扰效应。该界限也与顶部的前后不对称性进行了比较。
A reanalysis is presented on the CMS result on a search for a W′boson that couples to the top and down quarks. The model is motivated by the Tevatron results on the forward–backward asymmetry of tt¯ pair production. In the evaluation of the theoretical cross section of pp→tt¯j, the interference effect between the SM and W′amplitudes is shown to be important, though it is ignored in the CMS analysis. The lower mass bound on the W′boson is relaxed from 840 GeV to 740 GeV at the 95% C.L. due to the interference effect at the leading order calculation of the cross section. The bound is also compared to the top forward–backward asymmetry.