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arXiv 0907.3713hep-ex
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模拟强子对撞机上W玻色子事件反冲的一种新方法

A novel method for modeling the recoil in W boson events at hadron collider

V. M. Abazov

摘要:

本文提出了一种新的方法来模拟强子对撞机上产生的W->lnu事件中的强子反冲。反冲是从Z->ll数据事件中的反冲库中选择的,并且覆盖在模拟的W->lnu事件上。这种方法的实施要求数据反冲库描述作为真实的,而不是测量的,玻色子的横向动量的函数的测量反冲的属性。我们解决这个问题,使用多维贝叶斯展开技术。我们估计的统计和系统的不确定性,从这种方法的W玻色子的质量和宽度的测量,假设1 fb-1的数据从费米实验室Tevatron。的不确定性被发现是小的和可比的一个更传统的参数化后坐力模型。对于高精度的测量,将有可能从运行II的费米实验室Tevatron和欧洲核子研究中心LHC的数据,本文提出的方法可能是有利的,因为它不需要从第一原理的测量反冲的理解。

英文摘要:

We present a new method for modeling the hadronic recoil in W->lnu events produced at hadron colliders. The recoil is chosen from a library of recoils in Z->ll data events and overlaid on a simulated W->lnu event. Implementation of this method requires that the data recoil library describe the properties of the measured recoil as a function of the true, rather than the measured, transverse momentum of the boson. We address this issue using a multidimensional Bayesian unfolding technique. We estimate the statistical and systematic uncertainties from this method for the W boson mass and width measurements assuming 1 fb-1 of data from the Fermilab Tevatron. The uncertainties are found to be small and comparable to those of a more traditional parameterized recoil model. For the high precision measurements that will be possible with data from Run II of the Fermilab Tevatron and from the CERN LHC, the method presented in this paper may be advantageous, since it does not require an understanding of the measured recoil from first principles.

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