AI 中文总结
ATLAS探测器利用13和13.6 TeV质子-质子碰撞数据，测量希格斯玻色子衰变到低质量双轻子与光子的过程，单能区结果结合后信号显著性达3.4倍标准偏差，为相关物理研究提供了实验依据。
AI 中文摘要
本文利用ATLAS探测器在大型强子对撞机2022-2024年期间记录的质心系能量√s=13.6 TeV的质子-质子碰撞数据，对应积分亮度为164 fb⁻¹，对希格斯玻色子衰变至光子及一对不变质量m_ℓℓ<30 GeV的电子或μ子的过程进行了测量。信号强度参数定义为观测到的信号产额与标准模型预期值的比值，其最佳拟合值被测量为μ=0.64⁺⁰·⁴⁴₋₀·₃₉，而标准模型预期值为μ=1.00⁺⁰·⁴⁷₋₀·₄₁。在仅含本底的假设下，对应的观测（预期）信号显著性为1.7（2.5）个标准偏差。将该结果与2015-2018年期间利用质心系能量√s=13 TeV的质子-质子碰撞数据（对应积分亮度139 fb⁻¹）开展的类似搜索结果进行组合，组合后得到的观测（预期）信号强度为μ=1.03⁺⁰·³⁵₋₀·₃₂（μ=1.00⁺⁰·³⁴₋₀·₃₂），对应的观测（预期）显著性为3.4（3.3）个标准偏差。
英文摘要
A measurement is presented for the Higgs boson decaying into a photon and a pair of electrons or muons with an invariant mass $m_{\ell\ell} <$ 30 GeV, using $pp$ collision data at $\sqrt{s} =$ 13.6 TeV recorded by the ATLAS detector at the Large Hadron Collider during the years 2022-2024, corresponding to an integrated luminosity of 164 fb$^{-1}$. The best-fit value of the signal strength parameter, defined as the ratio of the observed signal yield to the one expected in the Standard Model, is measured to be $μ= 0.64^{+0.44}_{-0.39}$ compared with the expected value of $μ= 1.00^{+0.47}_{-0.41}$. The corresponding observed (expected) signal significance is 1.7 (2.5) standard deviations under the background-only hypothesis. The result is combined with a similar search performed using 139 fb$^{-1}$ of $pp$ collision data at $\sqrt{s} =$ 13 TeV collected during the years 2015-2018. This combination gives an observed (expected) signal strength of $μ= 1.03^{+0.35}_{-0.32}\,(μ= 1.00^{+0.34}_{-0.32})$, corresponding to an observed (expected) significance of 3.4 (3.3) standard deviations.
Comments45 pages in total, author list starting page 28, 7 figures, 3 tables, submitted to JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGP-2024-16/
