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在LHC测量MW + - MW -

Measurement of MW+ - MW- at LHC

F. Fayette, M. W. Krasny, W. Placzek, A. Siodmok

备注：
39 pages, 8 figures
发表信息：
Eur.Phys.J.C63:33-56,2009
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摘要：

本文是第二系列的论文提出专门的战略，精确测量的标准模型参数在大型强子对撞机。这些策略的共同特点是它们对系统测量和建模误差源的鲁棒性。它们对测量参数的精度的影响减少使用专用的观测和专用的测量程序，利用灵活性的碰撞和探测器运行模式。本文主要研究W玻色子质量的电荷不对称性的测量。这一测量对于LHC实验计划至关重要，既可以直接测试W玻色子与物质粒子的荷号无关耦合，也可以作为精确测量电荷平均W玻色子质量的必要的第一步。我们提出并评估了LHC特定的策略来测量带正电和带负电的W玻色子之间的质量差，MW+ - MW-。我们表明，其目前的精度可以提高在大型强子对撞机的一个因素的20。我们认为，这样的精度是超出了从Tevatron计划导入到LHC的标准测量和校准方法的范围。

英文摘要：

This paper is the second of the series of papers proposing dedicated strategies for precision measurements of the Standard Model parameters at the LHC. The common feature of these strategies is their robustness with respect to the systematic measurement and modeling error sources. Their impact on the precision of the measured parameters is reduced using dedicated observables and dedicated measurement procedures which exploit flexibilities of the collider and detector running modes. In the present paper we focus our attention on the measurement of the charge asymmetry of the W-boson mass. This measurement is of primordial importance for the LHC experimental program, both as a direct test of the charge-sign-independent coupling of the W-bosons to the matter particles and as a necessary first step towards the precision measurement of the charge-averaged W-boson mass. We propose and evaluate the LHC-specific strategy to measure the mass difference between the positively and negatively charged W-bosons, MW+ - MW-. We show that its present precision can be improved at the LHC by a factor of 20. We argue that such a precision is beyond the reach of the standard measurement and calibration methods imported to the LHC from the Tevatron program.

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