Rottoli Luca, Torrielli Paolo, Vicini Alessandro
Physik Institut, Universität Zürich, 8057 Zurich, Switzerland.
Dipartimento di Fisica, Università di Torino and INFN, Sezione di Torino, 10125 Turin, Italy.
Eur Phys J C Part Fields. 2023;83(10):948. doi: 10.1140/epjc/s10052-023-12128-z. Epub 2023 Oct 21.
We introduce an observable relevant for the determination of the -boson mass 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 allow a clean extraction of the latter and a straightforward discussion of the associated theoretical systematics: a perturbative QCD uncertainty of MeV on 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 at the LHC.
我们引入了一个与强子对撞机中玻色子质量测定相关的可观测量。这个可观测量被定义为在带电流德雷尔 - 扬过程中带电轻子横向动量分布的雅可比峰周围的不对称性。我们讨论了该可观测量的理论预测，给出了在不同 QCD 阶次下的结果，并展示了其微扰稳定性。它作为一个单一标量数的定义及其对的线性敏感性，使得能够清晰地提取后者，并直接讨论相关的理论系统误差：仅依靠带电流德雷尔 - 扬信息，借助这个可观测量可以确定玻色子质量的 QCD 微扰不确定性为 MeV。由于其相对包容性的性质，从实验角度来看，该可观测量也具有理想的特性，特别是对于探测器效应的展开。我们表明，对这个可观测量的测量可以在大型强子对撞机上得到关于玻色子质量具有竞争力的实验误差。
