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arXiv 1502.04671hep-phhep-ex
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部分子分布和$W$质量测量

Parton distributions and the $W$ mass measurement

Seth Quackenbush, Zack Sullivan

摘要:

我们研究了部分子分布误差的来源,在$W$质量测量,并指出现有文献中的不足之处。乐观的假设策略,以减少误差,通过规范化的$Z$可观的检查,发现过于依赖于假设的参数化和自由度的部分子分布函数(PDF)。我们设计了一种策略,以尽可能有效地结合测量误差相关性,以减少测量的整体不确定性,包括$Z$数据,并估计在大型强子对撞机的$W$质量测量的PDF误差为$^{+10}_{-12}$ MeV是可以实现的。进一步降低$W$质量不确定性需要改进对部分子分布函数的拟合。

英文摘要:

We examine the sources of parton distribution errors in the $W$ mass measurement, and point out shortcomings in the existing literature. Optimistic assumptions about strategies to reduce the error by normalizing to $Z$ observables are examined and found to rely too heavily on assumptions about the parametrization and degrees of freedom of the parton distribution functions (PDFs). We devise a strategy to combine measurements as efficiently as possible using error correlations to reduce the overall uncertainty of the measurement, including $Z$ data, and estimate a PDF error of $^{+10}_{-12}$ MeV is achievable in a $W$ mass measurement at the LHC. Further reductions of the $W$ mass uncertainty will require improved fits to the parton distribution functions.

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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