We report on potential for measurement of inclusive W and Z boson production cross section using initial data from the LHC. We have designed W and Z triggers, selection algorithms, and event reconstruction techniques for both muon and electron decay modes, for low luminosity operation of the LHC integrating up to about 10 pb-1. Initial calibrations and alignment accuracies are assumed. While the accuracy of the cross section extracted will be dominated by the integral luminosity measurement, ratios of W and Z production, and asymmetry distributions will be important early measurements from LHC.
Latest results on inclusive top-quark pair production cross-sections are presented using collision data collected by ATLAS and CMS experiments at the LHC. Inclusive and differential measurements of top-quark pair production cross-sections from ATLAS and CMS are presented in the resolved and boosted kinematic regions. The cross-sections are measured as a function of various kinematic observables of the top quarks, the jets and leptons of the event final state.
Search for Natural SUSY with inclusive search strategies at the LHC using the CMS detector
自然超对称性表明存在光阻夸克，可以在大型强子对撞机上获得，这是一个专门的CMS搜索程序的重点。我提出了两个包容性的CMS搜索，寻找TeV尺度的彩色sparticles在最终状态的喷气机，b标记的喷气机和失踪的横向能量进行高达19.4fb-1的8 TeV LHC质子-质子数据。在这些搜索中没有观察到与标准模型的偏离，并显示了几个简化模型场景和现象学MSSM的影响。
The results of the most recent measurements of the inclusive $\mathrm{t\bar{t}}$ cross section performed by the ATLAS and CMS experiments at the CERN LHC are summarized. These include results obtained in proton-proton collisions at different centre-of-mass energies, and the first observation of $\mathrm{t\bar{t}}$ production in proton-lead collisions. A new result at $\sqrt{s} = 13~\mathrm{TeV}$ by the CMS Collaboration is presented for the first time at this conference. In this analysis, the total cross section is determined both for a fixed top quark mass value in the simulation of $m_{\math…
Several electroweak precision measurements are performed by the ATLAS and CMS collaborations at the LHC. The main ones are carried out using Drell-Yan production of single W and Z boson. They regard the measurement of the production cross sections of W and Z bosons, the mass of the W boson, and $\sin^2θ_W$. The results of the $\sin^2θ_W$ measurements have an accuracy of approximately twice that reached at LEP and SLD. Other measurements reported are about the Drell-Yan differential production cross section.
Measurement of the muon charge asymmetry in inclusive $pp \rightarrow W + X$ production at $\sqrt{s} = 7$ TeV at CMS and an improved determination of light parton distribution functions
Inclusive and normalised differential cross sections measurements are presented for the production of single top quarks in association with a W boson, in proton-proton collisions at a centre-of-mass energy of 13 TeV. Events containing one muon and one electron in the final state are analysed. For the inclusive measurement, a multivariate discriminant, exploiting the kinematic properties of the events, is used to separate the signal from the dominant t$\bar{\mathrm{t}}$ background. For the differential measurements, a fiducial region is defined according to the detector acceptance, and the requ…
Combination of inclusive and differential $\mathrm{t}\overline{\mathrm{t}}$ charge asymmetry measurements using ATLAS and CMS data at $\sqrt{s} =$ 7 and 8 TeV
A search for central exclusive production of top quark pairs ($\mathrm{t}\bar{\mathrm{t}}$) is presented using collision data collected by CMS and the CMS-TOTEM Precision Proton Spectrometer in 2017. A data-driven method to estimate the background from coincidences of inclusive events and pileup protons is described, as well as the development of a Boosted Decision Tree classifier to separate the exclusive $\mathrm{t}\bar{\mathrm{t}}$ signal from the inclusive $\mathrm{t}\bar{\mathrm{t}}$ background. The first-ever upper limits on the cross section of exclusive $\mathrm{t}\bar{\mathrm{t}}$ are…
The top quark pair production cross section is measured in proton-proton collisions at a center-of-mass energy of 5.02 TeV. The data collected in 2017 by the CMS experiment at the LHC corresponding to an integrated luminosity of 304 pb$^{-1}$ are analyzed. The measurement is performed using events with one electron and one muon of opposite sign, and at least two jets. The measured cross section is found to be $σ_{\mathrm{t}\bar{\mathrm{t}}}~=~60.3~\pm5.0~\mathrm{(stat)}\pm2.8~\mathrm{(syst)}\pm0.9~\mathrm{(lumi)}$ pb. To reduce the statistical uncertainty, a combination with the result in the …
Measurement of the Charge Ratio of Cosmic Muons using CMS Data
我们已经进行了测量的宇宙射线μ介子电荷比，作为μ介子动量的函数，使用CMS实验收集的数据，利用μ介子桶漂移管（DT）室的能力。宇宙μ子电荷比被定义为正电荷μ子与负电荷μ子的数量之比。宇宙射线μ子是高能宇宙射线粒子（主要是质子和原子核）进入大气层上层与空气原子核相互作用的结果。由于这些碰撞有利于正介子的产生，因此电荷组成存在不对称性，预计会产生更多的正介子。在\textit{Magnet Test and Cosmic Challenge}（MTCC）采集数据样本。虽然MTCC本身是CMS探测器建设中的一个重要里程碑，但其主要目标中没有物理研究，它提供了第一次获得物理结果的机会，并在LHC启动之前使用CMS中的真实数据测试完整的分析链，以及对探测器性能的补充检查。
In order to disentangle CNM effects from the ``hot'' QGP effects, quarkonium production is studied in p--Pb collisions in which QGP formation is not expected. ALICE has measured the $Υ$ production in p--Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV at backward ($-$4.46 $<y_{\rm cms}<$ $-$2.96) and forward (2.03 $< y_{\rm cms}<$ 3.53) rapidity down to zero transverse momentum. At forward rapidity, a suppression of $Υ$(1S) production in p--Pb collisions is observed compared to the binary-scaled yield in pp collisions in the same kinematic domain while at backward rapidity no significant suppre…
Recent inclusive and differential cross section measurements of the associated production of top quark pairs with gauge bosons or heavy-flavor jets are reported. A search for physics beyond the standard model in the top quark sector is also presented. All measurements are based on data samples of proton-proton collisions at $\sqrt{s}=13$ TeV collected by the ATLAS and CMS experiments at the CERN LHC. No significant deviation from the standard model predictions is observed.
Measurement of the muon charge asymmetry in inclusive pp to WX production at sqrt(s) = 7 TeV and an improved determination of light parton distribution functions
Inclusive J/$ψ$ production is studied in p-Pb interactions at a centre-of-mass energy per nucleon-nucleon collision $\sqrt{s_{\rm NN}}=8.16$ TeV, using the ALICE detector at the CERN LHC. The J/$ψ$ meson is reconstructed, via its decay to a muon pair, in the centre-of-mass rapidity intervals $2.03<y_{\rm {cms}}<3.53$ and $-4.46<y_{\rm {cms}}<-2.96$, where positive and negative $y_{\rm {cms}}$ refer to the p-going and Pb-going direction, respectively. The transverse momentum coverage is $p_{\rm T}<20$ GeV/$c$. In this paper, $y_{\rm cms}$- and $p_{\rm T}$-differential cross sections for inclusi…
Measurement of the inclusive energy spectrum in the very forward direction in proton-proton collisions at sqrt(s) = 13 TeV
微分截面包容性粒子生产作为一个功能的能量在质子-质子碰撞的质心能量为13 TeV的测量在非常向前区域的CMS检测器。该测量基于在LHC处用CMS装置收集的数据，并且对应于0.35逆微仓的积分亮度。能量是在CASTOR量热计中测量的，它覆盖了赝快度区域-6.6 < eta <-5.2。结果给出作为一个函数的总能量沉积在CASTOR，以及其电磁和强子组件。该谱对pp碰撞中多部分子相互作用的模拟是敏感的，并为对撞机和高能宇宙线物理中使用的强子相互作用模型提供了新的约束。
Latest results from the CMS experiment at the LHC on top quark production in association with a Z boson or a photon, and the production of four top quarks, are summarized. Proton-proton collision data corresponding to an integrated luminosity of up to 138 fb$^{-1}$, collected at 13 TeV center-of-mass energy are used. Among the measured results, most precise inclusive cross sections, most stringent limits on models beyond the standard model and first differential measurements are presented. Overall, good agreement with standard model predictions is observed.
