本文研究了$\sqrt{s}$ =0.9，7和13 TeV pp碰撞中的ATLAS结果.我们表明，在pp碰撞中，对潜在事件（“横向”区域）和最硬的部分子相互作用（“朝向”和“远离”区域）敏感的带电粒子产生的质心能量依赖性可以用包容平均多重数的变化来理解。在不确定性，相应的粒子生产作为一个功能的领先的带电粒子显示没有显着的$\sqrt{s}$ -依赖的三个区域，一旦他们根据多重性的相对变化进行缩放。这里报道的标度性质很好地再现了PYTHIA 8.212 tune Monash 2013，并表明在高$\sqrt{s}$的强子相互作用的基础事件的普遍性。基于模拟，我们观察到，相同的标度特性也存在于作为领先的带电粒子的函数的多部分子相互作用的平均数。此外，多重性分布与潜在的事件表现出KNO标度。
英文摘要：
In this paper we study ATLAS results on underlying event in pp collisions at $\sqrt{s}$=0.9, 7 and 13 TeV. We show that the center-of-mass energy dependences of the charged-particle production sensitive to the underlying event ("transverse" region) and to the hardest partonic interaction ("towards" and "away" regions) in pp collisions can be both understood in terms of the change of the inclusive average multiplicity. Within uncertainties, the corresponding particle production as a function of the leading charged particle shows no significant $\sqrt{s}$-dependence for the three regions once they are scaled according to the relative change in multiplicity. The scaling properties reported here are well reproduced by PYTHIA 8.212 tune Monash 2013 and suggest an universality of the underlying event in hadronic interactions at high $\sqrt{s}$. Based on the simulations, we observed that the same scaling properties are also present in the average number of multi-partonic interactions as a function of the leading charged particle. Moreover, the multiplicity distributions associated to the underlying event exhibit a KNO scaling.
Precise test of lepton flavour universality in $W$-boson decays into muons and electrons in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
Test of lepton flavour universality in $W$-boson decays into electrons and $τ$-leptons using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
Search for charged Higgs bosons through the violation of lepton universality in ttbar events using pp collision data at sqrt(s) = 7 TeV with the ATLAS experiment
在标准模型的几个扩展中，除了标准模型的t衰变为bW之外，顶夸克还可以衰变为底夸克和轻荷希格斯玻色子H+，t衰变为bH+。由于W玻色子平均衰变为三代轻子，而H+主要衰变为τ +nu，因此可以利用顶夸克衰变中轻子普适性的破坏来寻找带电的希格斯玻色子玻色子。本文的分析是基于大型强子对撞机ATLAS实验收集的sqrt（s）= 7 TeV的4.6/fb质子-质子碰撞数据。使用包含轻子（e或mu）和/或强子衰变τ（tau_had）的签名。事件产率之间的e+tau_had和e+mu，以及mu+tau_had和mu+e，最终状态的数据进行测量，并从模拟的预测进行比较。这种基于比率的方法减少了分析中系统不确定性的影响。未观察到与标准模型预测的显著偏差。假设分支分数B（H+ to tau+nu）为100%，对于90-140 GeV范围内的带电希格斯玻色子质量m（H+），分支分数B（t to bH+）的上限可以设置在3.2%-4.4%的范围内。结合利用τ_had+喷流末态在ttbar衰变中寻找带电希格斯玻色子的结果，当m（H+）在90-160 GeV范围内时，B（t到bH+）的上限可以设定在0.8%-3.4%。
Particle production as a function of underlying-event activity and search for jet-like modifications in pp, p-Pb, and Pb-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV with ALICE
Test of lepton flavor universality in B$^{\pm}$ $\to$ K$^{\pm}μ^+μ^-$ and B$^{\pm}$ $\to$ K$^{\pm}$e$^+$e$^-$ decays in proton-proton collisions at $\sqrt{s}$ = 13 TeV
本研究利用 CMS 在 13 TeV 质子-质子碰撞中的高统计 b 强子衰变数据，通过双比率法测量 R(K) 及 B±→K±μ+μ− 分支比，以检验轻子味普适性。
Measurement of distributions sensitive to the underlying event in inclusive $Z$-boson production in pp collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
Measurement of distributions sensitive to the underlying event in inclusive Z-boson production in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
Measurements of underlying-event properties using neutral and charged particles in pp collisions at 900 GeV and 7 TeV with the ATLAS detector at the LHC
