利用DELPHI开放数据对质心系能量√s=91.2 GeV的正负电子对撞中一点电荷关联子的首次测量
First measurement of the one-point charge correlator in $e^+e^-$ collisions at $\sqrt{s} = 91.2$ GeV with DELPHI Open Data
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中文总结 AI 辅助
本文利用DELPHI开放数据首次测量了√s=91.2 GeV正负电子对撞中的一点电荷关联子，其结果与PYTHIA 8.3预言相符，为电荷流测量计划奠定了基础。
中文摘要 AI 辅助
Z玻色子耦合的手征结构会在Z玻色子的强子衰变中留下电荷的宇称奇性流。相关的前后不对称性是电弱精确计划中的关键观测量，LEP和SLC实验曾利用喷注电荷对其进行测量。一点电荷关联子提供了一条互补路径，它依据配套论文提出的形式体系，直接测量强子电荷流随相对于入射电子束轴的极角的变化，无需依赖喷注或重建的夸克方向。我们利用1994和1995年记录的61 pb⁻¹存档DELPHI开放数据，报告对该关联子的首次测量。探测器效应分两个阶段校正：第一阶段来自全模拟样本，第二阶段利用e⁺e⁻→τ⁺τ⁻事例的测量，限定数据与模拟之间残余的电荷错重建差异。测得的电荷关联子呈现出特征性的宇称奇性sin(2θ)调制，且与PYTHIA 8.3的预言相符。该测量证明了此观测量的实验可行性，确立了控制相关探测器效应的策略，为在存档正负电子对撞数据及未来对撞机上开展新的电荷流测量计划铺平了道路。
英文摘要
The chiral structure of the $Z$ couplings imprints a parity-odd flow of electric charge on hadronic $Z$ decays. The related forward-backward asymmetries, a key set of observables in the electroweak precision program, were measured at LEP and SLC using the jet charge. The one-point charge correlator offers a complementary route, measuring the hadronic charge flow directly as a function of polar angle relative to the incoming electron-beam axis, without reference to jets or a reconstructed quark direction, following the formalism developed in a companion paper. We report its first measurement, using $61~\mathrm{pb}^{-1}$ of archival DELPHI Open Data recorded at $\sqrt{s} = 91.2$~GeV in 1994 and 1995. Detector effects are corrected in two stages. The first is derived from fully simulated samples, and the second bounds the residual charge-misreconstruction difference between data and simulation using a measurement in $e^+e^-\toτ^+τ^-$ events. The measured charge correlator exhibits the characteristic parity-odd $\sin(2θ)$ modulation and agrees with the \textsc{PYTHIA}~8.3 prediction. The measurement demonstrates that the parity-odd charge flow of hadronic $Z$ decays is directly accessible in data, differentially in polar angle, and the paper discusses strategies for controlling the associated detector effects, paving the way for a new program of charge-flux measurements, both in archival $e^+e^-$ data and at future colliders.
发表机构
- Vanderbilt University（范德堡大学）
- Argonne National Laboratory（阿贡国家实验室）
- Yale University（耶鲁大学）
- Massachusetts Institute of Technology（麻省理工学院）
机构由 AI 辅助整理，请以论文原文为准。
