在LHC上对MW + - MW - & MW进行精确测量的前景：重新审视捷径
Prospect for precision measurements of MW+ -MW- & MW at the LHC: Shortcuts revisited
摘要：
对W玻色子质量可以在大型强子对撞机上以O（10 MeV）的精度测量的说法进行了批判性的评论。有人认为，这样的精度无法实现，除非一个专门的测量计划，具体到大型强子对撞机的追求。我们提出这样一个方案。它的主要目标是显着提高实验控制的相对极化的W+，W-和Z玻色子。我们建议通过在LHC运行专用的等辐射束或通过在CERN SPS运行与标准p-p碰撞程序并行的专用μ子散射“LHC支持实验”来实现这一目标。这些辅助测量中的一个对于LHC的“精密测量计划”是必要的，但还不够。它必须遵循专门的测量策略，这是强大的系统测量不确定性和微扰和非微扰QCD效应。我们提出这样的策略，并评估其精度。在大型强子对撞机上，与Tevatron的情况相反，W+和W-玻色子的质量都必须以高精度测量。在这种情况下，我们建议和评估大型强子对撞机专用的策略来测量的W+和W-玻色子的质量和W玻色子的绝对质量的差异，假设这两个质量是相等的。我们展示了如何克服测量W+和W-的质量的障碍，精度为10兆电子伏。我们提出了一个详细的评估精度的建议方法的基础上，一个大的，O（10^11），模拟W和Z生产事件的样本的研究。
英文摘要：
The claim that the W boson mass might be measured at the LHC with a precision of O(10 MeV) is critically reviewed. It is argued that such a precision cannot be achieved, unless a dedicated measurement program, specific to the LHC is pursued. We propose such a program. Its main target is to significantly improve the experimental control of the relative polarisation of the W+, W- and Z bosons. We propose to achieve this goal either by running dedicated isoscalar beams at the LHC or by running, in parallel to the standard p-p collision program, a dedicated muon scattering "LHC-support-experiment" at the CERN SPS. One of these auxiliary measurements is necessary for the "precision measurement program" at the LHC, but not sufficient. It must be followed by dedicated measurement strategies which are robust with respect to both the systematic measurement uncertainties and to the perturbative and non-perturbative QCD effects. We propose such strategies and evaluate their precision. At the LHC, contrary to the Tevatron case, both the masses of the W+ and of the W- bosons must be measured with high precision. In this context, we propose and evaluate LHC dedicated strategies to measure the difference of the masses of the W+ and W- bosons and of the absolute mass of the W boson assuming both masses are equal. We show how one can overcome the obstacles in measuring the masses of W+ and W- to a precision of 10 MeV. We present a detailed evaluation of the precision of the proposed methods based on the studies of a large, O(10^11), sample of simulated W and Z production events.
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