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Abstract <p>In this paper, we present the study of the <i>Z</i>-boson decay into two leptons and photon with world best accuracy. The systematic uncertainties for measured differential distributions do not exceed 0.6%. In general, the predictions of the latest versions of modern generators PowHeg + PHOTOS, Sherpa 2.2.4 and KKMChh describe the experimental data well, at the same time, small deviations are present near the phase volume boundaries: 20 &lt; <i>M</i><sub><i>ll</i></sub> &lt; 45 GeV, ∆<i>R</i><sub><i>l</i>γ</sub> ≈ 2.5, <i>M</i><sub><i>l</i>γ</sub> ≈ 80 GeV. The significance of the deviation at <i>M</i><sub><i>l</i>γ</sub> ≈ 80 GeV exceeds 3σ.</p>

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Studying the Z Boson Decay into the Lepton Pair and Photon with the Data from the ATLAS Detector at the Large Hadron Collider

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • A. G. Kharlamov,
  • T. A. Kharlamova,
  • A. S. Kupich,
  • V. N. Zhabin

摘要

Abstract

In this paper, we present the study of the Z-boson decay into two leptons and photon with world best accuracy. The systematic uncertainties for measured differential distributions do not exceed 0.6%. In general, the predictions of the latest versions of modern generators PowHeg + PHOTOS, Sherpa 2.2.4 and KKMChh describe the experimental data well, at the same time, small deviations are present near the phase volume boundaries: 20 < Mll < 45 GeV, ∆Rlγ ≈ 2.5, Mlγ ≈ 80 GeV. The significance of the deviation at Mlγ ≈ 80 GeV exceeds 3σ.