利用ATLAS探测器在质心系能量√s=13 TeV的质子-质子碰撞中采集的140 fb⁻¹数据，对光子-喷注末态中的高质量共振态进行搜索
Search for high-mass resonances in photon-jet final states using 140 fb$^{-1}$ of $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
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中文总结 AI 辅助
利用ATLAS探测器采集的140 fb⁻¹ 13 TeV质子-质子碰撞数据，搜索光子-喷注末态的高质量共振态，未发现标准模型外显著偏差，对多种新物理场景给出严格限制。
中文摘要 AI 辅助
本研究利用大型强子对撞机（LHC）上ATLAS探测器采集的质心系能量为13 TeV的质子-质子碰撞数据，对包含高横动量光子与喷注的事例中的新高质量现象开展搜索。分析基于总计积分亮度140 fb⁻¹，对数据中测量得到的γ-喷注不变质量谱进行检验，以寻找超出标准模型背景的局域超出量。研究未观测到与标准模型预测存在显著偏差，因此可对特定新物理场景的产生截面设定严格限制。为研究夸克复合性，针对不同耦合（f）和味的激发夸克模型展开研究：轻夸克激发态q_L^*（u^*/d^*）以及重夸克激发态（b^*、c^*）。当f=1时，质量上限分别为6.0 TeV（q_L^*）、3.5 TeV（c^*）和2.6 TeV（b^*）的激发夸克被排除。这些结果首次在LHC的γ-喷注末态中对c^*的产生给出直接约束。此外，在95%置信水平下，本分析还排除了Randall-Sundrum模型（Arkani-Hamed-Dimopoulos-Dvali模型）中量子黑洞质量阈值最高达5.3（7.5）TeV的情况，进一步约束了这些理论框架。同时，利用通用高斯形状共振产生也获得了对可见截面的约束。
英文摘要
A search for new high-mass phenomena in events with a high-transverse-momentum photon and a jet is performed using data collected by the ATLAS experiment from proton-proton collisions at the LHC, with a centre-of-mass energy of 13 TeV. The analysis is based on a total integrated luminosity of 140 fb$^{-1}$. The $γ$$-$jet invariant mass spectrum measured in data is examined for localised excesses above the Standard Model background. No significant deviation from the Standard Model prediction is observed, allowing stringent limits to be set on the production cross sections of specific new physics scenarios. To investigate quark compositeness, excited quark models are studied for different couplings ($f$) and flavours: light $q_{\mathrm{L}}^{*}$ $(u^{*}/d^{*})$ and heavy ($b^{*}$, $c^{*}$). For $f=1$, masses up to 6.0 TeV ($q_{\mathrm{L}}^{*}$), 3.5 TeV ($c^{*}$), and 2.6 TeV ($b^{*}$) are excluded. These results provide the first direct constraints on $c^{*}$ production in the $γ$$-$ jet final state at the LHC. Additionally, the analysis excludes quantum black hole mass thresholds up to 5.3 (7.5) TeV in the Randall-Sundrum (Arkani-Hamed-Dimopoulos-Dvali) models at a 95% confidence level, further constraining these theoretical frameworks. Constraints on the visible cross-section are also obtained using generic Gaussian-shaped resonance production.
