arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.14537hep-ex
收藏

在ATLAS上通过光子聚变机制产生的轻子对的前向质子散射的观测和测量

Observation and measurement of forward proton scattering in association with lepton pairs produced via the photon fusion mechanism at ATLAS

ATLAS Collaboration

备注：
31 pages in total, author list starting page 15, 3 figures, 1 table, submitted to Phys. Rev. Lett. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2018-16/
发表信息：
Phys. Rev. Lett. 125, 261801 (2020)
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

本文报道了光子聚变产生的轻子对（$e^+e^-+p$或$μ^+μ^-+p$）与质子前向散射的观测结果。散射质子由ATLAS正向质子谱仪探测，而轻子则由中央ATLAS探测器重建。分析了2017年在$\sqrt{s} = 13$ TeV质心能量下记录的质子-质子碰撞数据，对应于14.6 fb $^{-1}$的积分光度。在$ee+p$（$μμ+p$）最终状态中选择总共57（123）个候选者，允许在每个通道中以超过五个标准偏差的显著性拒绝仅背景假设。在基准探测器验收中引入质子标记技术用于截面测量，对应于$σ_{ee+p}$ = 11.0 $\pm$ 2.6（stat.）$\pm$ 1.2（系统）$\pm$ 0.3（流明）fb和$σ_{μμ+p}$ = 7.2 $\pm$ 1.6（统计学）$\pm$ 0.9（系统）$\pm$ 0.2（流明）fb的双电子和双μ子通道，分别。

英文摘要：

The observation of forward proton scattering in association with lepton pairs ($e^+e^-+p$ or $μ^+μ^-+p$) produced via photon fusion is presented. The scattered proton is detected by the ATLAS Forward Proton spectrometer while the leptons are reconstructed by the central ATLAS detector. Proton-proton collision data recorded in 2017 at a center-of-mass energy of $\sqrt{s} = 13$ TeV are analyzed, corresponding to an integrated luminosity of 14.6 fb$^{-1}$. A total of 57 (123) candidates in the $ee+p$ ($μμ+p$) final state are selected, allowing the background-only hypothesis to be rejected with a significance exceeding five standard deviations in each channel. Proton-tagging techniques are introduced for cross-section measurements in the fiducial detector acceptance, corresponding to $σ_{ee+p}$ = 11.0 $\pm$ 2.6 (stat.) $\pm$ 1.2 (syst.) $\pm$ 0.3 (lumi.) fb and $σ_{μμ+p}$ = 7.2 $\pm$ 1.6 (stat.) $\pm$ 0.9 (syst.) $\pm$ 0.2 (lumi.) fb in the dielectron and dimuon channel, respectively.

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。

↑