arXiv 2301.040592023-01hep-phhep-ex

强子对撞机上$W$玻色子质量的测定

Determination of the $W$-boson mass at hadron colliders

Luca Rottoli, Paolo Torrielli, Alessandro Vicini

备注：: 6 pages, 5 figures. Final version published in EPJC
DOI：: 10.1140/epjc/s10052-023-12128-z

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AI总结：

本研究提出一种用于强子对撞机上W玻色子质量测定的新可观测量，基于带电流Drell-Yan过程带电轻子横动量分布雅可比峰的不对称性，兼具微扰稳定性与实验可行性，可实现高精度质量提取。

摘要：

我们提出一种与强子对撞机上$W$玻色子质量$m_W$测定相关的可观测量。该可观测量被定义为带电流Drell-Yan过程中带电轻子横动量分布雅可比峰附近的不对称性。我们讨论了该可观测量的理论预言，给出了量子色动力学（QCD）不同阶次的计算结果，并展示了其微扰稳定性。它以单个标量数值的形式定义，且对$m_W$具有线性灵敏度，这使得我们能够清晰地提取后者，并直接讨论相关的理论系统误差：仅依靠带电流Drell-Yan过程的信息，通过该可观测量可确定$m_W$的微扰QCD不确定性为${\cal O}(\pm 5)$MeV。由于该可观测量具有相对包容性的特点，从实验角度来看它也具备理想的性质，尤其是在探测器效应的去折叠方面。我们表明，在大型强子对撞机（LHC）上测量该可观测量，可得到具有竞争力的$m_W$实验误差。

英文摘要：

We introduce an observable relevant for the determination of the $W$-boson mass $m_W$ at hadron colliders. This observable is defined as an asymmetry around the jacobian peak of the charged-lepton transverse-momentum distribution in the charged-current Drell-Yan process. We discuss the observable's theoretical prediction, presenting results at different orders in QCD, and showing its perturbative stability. Its definition as a single scalar number and its linear sensitivity to $m_W$ allow a clean extraction of the latter and a straightforward discussion of the associated theoretical systematics: a perturbative QCD uncertainty of ${\cal O}(\pm 5)$ MeV on $m_W$ can be established by means of this observable, relying solely on charged-current Drell-Yan information. Owing to its relatively inclusive nature, the observable displays desirable properties also from the experimental viewpoint, especially for the unfolding of detector effects. We show that a measurement of this observable can lead to a competitive experimental error on $m_W$ at the LHC.

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