结果提出了从搜索新的物理在最终状态包含一个光子和失踪的横向能量。这些数据对应于CMS实验在$\sqrt{s}$ = 7 TeV的pp碰撞中收集的5.0 fb $^{-1}$的积分光度。观察到的事件收益率与标准模型预期一致。使用暗物质粒子（$χ$）的产生模型，我们设定90个$% confidence level (C.L.) upper limits of 13.6-15.4 fb on $ × $ production in the $ γ $+ $ \met $ state. These provide the most sensitive upper limits for spin-dependent $ × $-nucleon scattering for \c{hi} masses between 1 and 100 GeV. For spin dependent contributions, the present limits are extended to M($ × $) $ <3.5 GeV.对于具有3-6个大额外维度的ADD模型，我们的数据排除了95%C. L时1.64和1.73 TeV之间的额外维度普朗克尺度。
英文摘要：
Results are presented from a search for new physics in the final state containing a photon and missing transverse energy. The data corresponds to an integrated luminosity of 5.0 fb$^{-1}$ collected in pp collisions at $\sqrt{s}$= 7 TeV by the CMS experiment. The observed event yield agrees with standard model expectations. Using models for the production of dark matter particles($χ$), we set 90$% confidence level (C.L.) upper limits of 13.6-15.4 fb on $χ$ production in the $γ$+ $\met$ state. These provide the most sensitive upper limits for spin-dependent $χ$-nucleon scattering for \c{hi} masses between 1 and 100 GeV. For spin dependent contributions, the present limits are extended to M($χ$) $<$ 3.5 GeV. For ADD models with 3-6 large extra dimensions, our data exclude extra-dimensional Planck scales between 1.64 and 1.73 TeV at 95% C.L.
The performance of reconstruction and calibration of jets and missing transverse momentum in the CMS Collaboration, together with the latest tools for pileup mitigation, is presented. The results shown are relative to the data collected from 2016 to 2018 (Run 2) in proton-proton collisions at a centre-of-mass energy of 13 TeV. An outlook to the new techniques foreseen for Run 3 is discussed.
A search for new physics in central exclusive production using the missing mass technique with the CMS detector and the CMS-TOTEM precision proton spectrometer
A search for direct top squark pair production is presented. The search is based on proton-proton collision data at a center-of-mass energy of 13 TeV recorded by the CMS experiment at the LHC during 2016, 2017, and 2018, corresponding to an integrated luminosity of 137 fb$^{-1}$. The search is carried out using events with a single isolated electron or muon, multiple jets, and large transverse momentum imbalance. The observed data are consistent with the expectations from standard model processes. Exclusions are set in the context of simplified top squark pair production models. Depending on t…
Search for supersymmetry in the multijet and missing transverse momentum final state: an analysis performed on 2.3 fb$^{-1}$ of 13 TeV pp collision data collected with the CMS detector
The performance of missing transverse momentum (${\vec p}_{\mathrm{T}}^\mathrm{miss}$) reconstruction algorithms for the CMS experiment is presented, using proton-proton collisions at a center-of-mass energy of 13 TeV, collected at the CERN LHC in 2016. The data sample corresponds to an integrated luminosity of 35.9 fb$^{-1}$. The results include measurements of the scale and resolution of ${\vec p}_{\mathrm{T}}^\mathrm{miss}$, and detailed studies of events identified with anomalous ${\vec p}_{\mathrm{T}}^\mathrm{miss}$. The performance is presented of a ${\vec p}_{\mathrm{T}}^\mathrm{miss}$ …
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 classic searches for supersymmetry have not given any strong indication for new physics. Therefore CMS is designing dedicated searches to target the more difficult and specific supersymmetry scenarios. This contribution present three such recent searches based on 13 TeV proton-proton collisions recorded with the CMS detector in 2016, 2017 and 2018: a search for heavy gluinos cascading via heavy next-to-lightest neutralino in final states with boosted Z bosons and missing transverse momentum; a search for compressed supersymmetry in final states with soft taus; and a search for compressed, …
A search for long-lived particles decaying to displaced, nonprompt jets and missing transverse momentum is presented. The data sample corresponds to an integrated luminosity of 137 fb$^{-1}$ of proton-proton collisions at a center-of-mass energy of 13 TeV collected by the CMS experiment at the CERN LHC in 2016-2018. Candidate signal events containing nonprompt jets are identified using the timing capabilities of the CMS electromagnetic calorimeter. The results of the search are consistent with the background prediction and are interpreted using a gauge-mediated supersymmetry breaking reference…
A search for dark matter and unparticle production at the LHC has been performed using events containing two charged leptons (electrons or muons), consistent with the decay of a Z boson, and large missing transverse momentum. This study is based on data collected with the CMS detector in 2015, corresponding to an integrated luminosity of 2.3 inverse femtobarns of proton-proton collisions at the LHC, at a center-of-mass energy of 13 TeV. No excess over the standard model expectation is observed. Compared to previous searches in this topology, which exclusively relied on effective field theories…
In this work, we present a search for the possible production of Dark Matter particles at the Large Hadron Collider alongside a new hypothetical gauge boson denoted by Z$^{\prime}$, which is governed by a model called Mono-Z$^{\prime}$. The topology of the studied events is dimuons plus large missing transverse momentum. The analyzed data were the CMS open data samples collected by the CMS detector, in addition to the CMS open Monte Carlo samples, for the proton-proton collisions at 8 TeV center of mass energy during 2012, which correspond to an integrated luminosity of 11.6 fb$^{-1}$. Two ben…
Searches for strong production of SUSY particles with two opposite-sign same-flavor leptons at CMS
在末态具有两个相反符号、相同味道的轻子、喷流和缺少横动量的事件中，寻找超越标准模型的物理。在2016年CMS实验记录的$\sqrt{s} = $ 13 TeV pp碰撞的35.9 $\mathrm{fb}^{-1}$数据集中进行搜索。搜索目标是产生有色粒子的模型。模型被认为是，在双轻子不变的质量分布和模型中，Z玻色子出现在超对称粒子的衰变链中观察到的运动学边缘。这样的搜索已经在8 TeV pp碰撞以及13 TeV碰撞中进行。这个版本的搜索增加了额外的事件类别以及改进的背景估计程序，大大提高了搜索的灵敏度。结果被解释的超对称性的简化模型的上下文中。
Search for new physics in the low MET monophoton channel with the CMS Detector
随着最近在大型强子对撞机（LHC）上发现希格斯玻色子，紧凑μ子螺线管（CMS）实验的目标现在集中在探索标准模型之外的新物理。由一个低横能光子和一个低丢失横能（MET）组成的终态，也被称为双光子终态，可以用来约束标准模型的各种扩展，包括超对称性。我使用CMS探测器收集的7.3/fb的8 TeV pp碰撞数据，在这个低MET单光子通道中搜索新物理。该分析将高能量单光子搜索扩展到较低能量区域。在没有偏离标准模型预测的情况下，对希格斯玻色子的奇异衰变的产生截面设定了限制。此外，我们提出了一个通用的信号在Dahoton最终状态的模型独立的限制。
Searches for the pair-production of colored supersymmetric particles are presented. The results cover different scenarios of gluino and squark production, including models of split supersymmetry that predict long-lived gluinos, compressed supersymmetric mass spectra characterized by soft decay products as well as models with R-parity violation with low or no missing transverse momentum in the final state. The results are based on proton-proton collisions recorded at $\sqrt{s}=$ 13 TeV with the CMS detector.
With increasing instantaneous luminosity at the LHC come additional reconstruction challenges. At high luminosity, many collisions occur simultaneously within one proton-proton bunch crossing. The isolation of an interesting collision from the additional "pileup" collisions is needed for effective physics performance. In the CMS Collaboration, several techniques capable of mitigating the impact of these pileup collisions have been developed. Such methods include charged-hadron subtraction, pileup jet identification, isospin-based neutral particle "$δβ$" correction, and, most recently, pileup p…
The results from a search for chargino-neutralino or chargino pair production via electroweak interactions are summarized. The results are based on a sample of $\sqrt{s}=13~\mathrm{TeV}$ proton-proton collisions from the LHC, recorded with the CMS detector~\cite{cms} and corresponding to an integrated luminosity of $137~\mathrm{fb}^{-1}$. The search considers final states with large missing transverse momentum and pairs of hadronically decaying bosons WW, WZ, and WH, which are identified using novel algorithms. No significant excess of events is observed relative to the expectation from the st…
A search for the production of long-lived particles in proton-proton collisions at a center-of-mass energy of 13 TeV at the CERN LHC is presented. The search is based on data collected by the CMS experiment in 2016-2018, corresponding to a total integrated luminosity of 137 fb$^{-1}$. This search is designed to be sensitive to long-lived particles with mean proper decay lengths between 0.1 and 1000 mm, whose decay products produce a final state with at least one displaced vertex and missing transverse momentum. A machine learning algorithm, which improves the background rejection power by more…
Search for new phenomena in final states with large jet multiplicities and missing transverse momentum using sqrt(s)=7 TeV pp collisions with the ATLAS detector
Search for supersymmetry in final states with a single lepton, b-quark jets, and missing transverse energy in proton-proton collisions at sqrt(s) = 7 TeV
