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Jet substructure and boosted jet measurements at CMS CMS的射流子结构和增压射流测量
D. Cerci
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引用次数: 0
Light hadron spectroscopy at BESIII BESIII的光强子光谱
Runqiu Ma
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引用次数: 1
Providing the computing and data to the physicists: Overview of the ATLAS distributed computing system 为物理学家提供计算和数据:ATLAS分布式计算系统概述
M. Svatos
The ATLAS experiment at CERN uses more than 150 sites in the WLCG to process and analyze data recorded by the LHC. The grid workflow system PanDA routinely utilizes more than 400 thousand CPU cores of those sites. The data management system Rucio manages about half an exabyte of detector and simulation data distributed among these sites. With the ever-improving performance of the LHC, more data is expected to come and the ATLAS computing needs to evolve and adapt to that. Disk space will become more scarce which should be alleviated by more active usage of tapes and caches and new smaller data formats. Grid jobs can run not just on the WLCG sites but also on opportunistic resources, i.e. clouds and HPCs. A new grafana-based monitoring system facilitates operation of the ATLAS computing. This presentation will review and explain the improvements put in place for the upcoming Run 3 and will provide an outlook to the many improvements needed for the HL-LHC.
欧洲核子研究中心的ATLAS实验使用WLCG中的150多个站点来处理和分析大型强子对撞机记录的数据。网格工作流系统PanDA通常使用这些站点的40多万个CPU内核。数据管理系统Rucio管理分布在这些站点之间的大约半eb的探测器和模拟数据。随着大型强子对撞机性能的不断提高,预计会有更多的数据出现,ATLAS计算需要不断发展和适应。磁盘空间将变得更加稀缺,这应该通过更积极地使用磁带和缓存以及新的更小的数据格式来缓解。网格作业不仅可以在WLCG站点上运行,还可以在机会资源上运行,例如云和高性能计算。一种新的基于grafana的监测系统便于ATLAS计算的操作。本演讲将回顾和解释即将到来的Run 3的改进,并将展望HL-LHC所需的许多改进。
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引用次数: 1
Early results from Full Event Interpretation at Belle II Belle II全事件解释的早期结果
William Sutcliffe
loose selection on the tag-side multivariate classifier, the calibration factors are 0.65± 0.02 and 0.83 ± 0.03 for tag-side + and 0 mesons, respectively. The calibrated hadronic tag-side decay modes are used to measure the branching fractions B( 0 → ∗+l− āl) = (4.45 ± 0.41(stat) ± 0.27(sys) ± 0.45(cs)) × 10−2 and B( 0 → c+l− āl) = (1.62 ± 0.42(stat) ± 0.07(sys)) × 10−4 in 34.6 fb−1 of Belle II data.
标签侧多元分类器选择松散,标签侧+介子和0介子的校正因子分别为0.65±0.02和0.83±0.03。标定的强子标签侧衰变模式用于测量Belle II数据34.6 fb−1中的分支分数B(0→∗+l−āl) =(4.45±0.41(stat)±0.27(sys)±0.45(cs)) × 10−2和B(0→c+l−āl) =(1.62±0.42(stat)±0.07(sys)) × 10−4。
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引用次数: 0
The ILD Software Tools and Detector Performance ILD软件工具和检测器性能
R. Eté
The ILD detector is designed for high precision physics at the ILC. It is optimized for particle flow event reconstruction with extremely precise tracking capabilities and highly granular calorimeters. Over the last decade, the ILD concept group has developed a suite of sophisticated software packages for simulation and reconstruction in the context of the iLCSoft ecosystem in collaboration with other future collider projects. We will present an overview of the ILD software from the detailed and realistic modeling of the detector with DD4hep, over the event reconstruction algorithms with its pattern recognition and particle flow algorithms to the high level reconstruction for flavor tagging and particle identification. Most of the these tools have been developed in a detector-agnostic way and are also applicable to other future collider experiments. Finally we will present an overview of the resulting detector performance as shown in ILD’s Interim Design Report (IDR) [1]. Talk presented at 40th International Conference on High Energy physics ICHEP2020 July 28 August 6, 2020 Prague, Czech Republic (virtual meeting) 1) Speaker, email: remi.ete@desy.de The ILD Software Tools and Detector Performance Remi Etea,⇤, on behalf of the ILD concept group a Deutsches Elektronen-Synchrotron, Notkestraße 85, 22607 Hamburg, Germany E-mail: remi.ete@desy.de The ILD detector is designed for high precision physics at the ILC. It is optimized for particle flow event reconstruction with extremely precise tracking capabilities and highly granular calorimeters. Over the last decade, the ILD concept group has developed a suite of sophisticated software packages for simulation and reconstruction in the context of the iLCSoft ecosystem in collaboration with other future collider projects. We will present an overview of the ILD software from the detailed and realistic modeling of the detector with DD4hep, over the event reconstruction algorithms with its pattern recognition and particle flow algorithms to the high level reconstruction for flavor tagging and particle identification. Most of the these tools have been developed in a detector-agnostic way and are also applicable to other future collider experiments. Finally we will present an overview of the resulting detector performance as shown in ILD’s Interim Design Report (IDR) [1]. 40th International Conference on High Energy physics ICHEP2020 July 28 August 6, 2020 Prague, Czech Republic (virtual meeting)
ILD探测器是为ILC的高精度物理设计的。它是优化颗粒流事件重建与极其精确的跟踪能力和高颗粒量热计。在过去的十年中,ILD概念组与其他未来的对撞机项目合作,开发了一套复杂的软件包,用于在iLCSoft生态系统的背景下进行模拟和重建。我们将概述ILD软件,从使用DD4hep对检测器进行详细和逼真的建模,到事件重建算法及其模式识别和粒子流算法,再到用于风味标记和粒子识别的高级重建。这些工具中的大多数都是以与探测器无关的方式开发的,并且也适用于其他未来的对撞机实验。最后,我们将介绍ILD中期设计报告(IDR)[1]中所示的探测器性能概述。在第40届国际高能物理会议ICHEP2020上的演讲2020年7月28日8月6日,捷克布拉格(虚拟会议)1)演讲者,电子邮件:remi.ete@desy.de ILD软件工具和探测器性能Remi Etea, ,代表ILD概念组a Deutsches Elektronen-Synchrotron, Notkestraße 85, 22607汉堡,德国电子邮件:remi.ete@desy.de ILD探测器是为ILC的高精度物理设计的。它是优化颗粒流事件重建与极其精确的跟踪能力和高颗粒量热计。在过去的十年中,ILD概念组与其他未来的对撞机项目合作,开发了一套复杂的软件包,用于在iLCSoft生态系统的背景下进行模拟和重建。我们将概述ILD软件,从使用DD4hep对检测器进行详细和逼真的建模,到事件重建算法及其模式识别和粒子流算法,再到用于风味标记和粒子识别的高级重建。这些工具中的大多数都是以与探测器无关的方式开发的,并且也适用于其他未来的对撞机实验。最后,我们将介绍ILD中期设计报告(IDR)[1]中所示的探测器性能概述。第40届国际高能物理会议ICHEP2020 2020年7月28日8月6日,捷克布拉格(虚拟会议)
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引用次数: 0
Dedicated data analyses for improving PDFs: Study of proton parton distribution functions at high x and charm production in charged DIS at HERA 改进pdf文件的专用数据分析:高x下质子部分分布函数和HERA带电DIS的粲子产生的研究
R. Aggarwal
Proton parton distribution functions (PDFs) are poorly constrained by existing data for Bjorken x larger than 0.6, and the PDFs extracted from global fits differ considerably from each other. A technique for comparing predictions based on different PDF sets to observed event numbers is presented. It is applied to compare predictions from the most commonly used PDFs to published ZEUS data at high Bjorken x. A wide variation is found in the ability of the PDFs to predict the observed results. A scheme for including the ZEUS high-x data in future PDF extractions is discussed. Charm production in charged current deep inelastic scattering has been measured for the first time in e±p collisions, using data collected with the ZEUS detector at HERA, corresponding to an integrated luminosity of 358 pb−1 separately for e+p and e−p scattering at a centre-of-mass energy of √ (s) =318GeV within a kinematic phase-space region of 200 GeV2< Q2 <60000 GeV2 and y <0.9, where Q2 is the squared four-momentum transfer and y is the inelasticity. The measured cross sections of electroweak charm production are consistent with expectations from the Standard Model within the large statistical uncertainties.
当Bjorken x大于0.6时,质子部分分布函数(PDFs)不受现有数据的约束,并且从全局拟合中提取的PDFs差异很大。提出了一种将基于不同PDF集的预测与观测到的事件数进行比较的技术。它用于比较最常用的pdf与高Bjorken x发布的ZEUS数据的预测。在pdf预测观测结果的能力方面存在很大差异。讨论了在未来的PDF提取中包含ZEUS高x数据的方案。利用HERA的ZEUS探测器收集的数据,首次在e±p碰撞中测量了带电电流深度非弹性散射的粲子产生,在200 GeV2< Q2 <60000 GeV2和y <0.9的运动相空间区域内,质心能量为√(s) =318GeV时,e+p和e- p散射的积分光度分别为358 pb−1,其中Q2为四动量传递的平方,y为非弹性。在较大的统计不确定性下,电弱粲子产生的测量横截面与标准模型的预期一致。
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引用次数: 0
Event plane determination with the new ALICE FIT detector 用新的ALICE FIT检测器确定事件平面
H. Rytkonen
Duringthe on-goingsecond longshutdownof LHC,the forwarddetectorsof theALICEexperiment are implementing an extensive upgrade. In particular, a new Fast Interaction Trigger (FIT) has been designed and built. It consists of three sub-detector systems delivering a broad range of online functionalities, and an essential input for event characterization and physics analysis. For instance, FIT will deliver the precise collision time for the TOF-based particle identification, provide the centrality and the event plane information, and measure the cross section of diffractive processes. This note will discuss usage of FIT in the event plane determination during Run 3. A simulated event plane resolution at √ s NN = 2 . 76 TeV is also presented.
在正在进行的LHC第二次长时间关闭期间,alice实验的前向探测器正在进行广泛的升级。特别地,设计并制造了一种新的快速交互触发器(FIT)。它由三个子探测器系统组成,提供广泛的在线功能,并为事件表征和物理分析提供必要的输入。例如,FIT将为基于tof的粒子识别提供精确的碰撞时间,提供中心性和事件平面信息,并测量衍射过程的横截面。本文将讨论在Run 3期间确定事件平面时FIT的用法。在√s NN = 2时模拟事件平面分辨率。还提出了76tev。
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引用次数: 0
Searches for flavour violation and flavour changing neutral currents in top quark final states 在顶夸克最终态中寻找味道违背和改变味道的中性电流
N. M. Köhler
The remarkably large integrated luminosity collected by the ATLAS detector at the highest protonproton collision energy provided by the Large Hadron Collider (LHC) allows to probe the presence of new physics thatmight breakwell established symmetries or enhance extremely rare processes in the StandardModel (SM) of particle physics. Two such significant examples are lepton universality and Flavour Changing Neutral Currents (FCNC). Recent measurements involving B-meson decays sparked renewed interest in testing lepton universality between tau and light leptons because of observed deviations at the four-standard-deviation level. By selecting events with two opposite sign leptons (muon pairs and electron-muon pairs) and at least two b-tagged jets, a highly pure sample of top-quark pair decays is assembled and used to extract a large unbiased sample of W bosons decaying to leptons down to low transverse momenta. A fit to the two dimensional distribution of the transverse momentum and the transverse impact parameter of the lepton is then used to differentiate between leptons originating directly from the W boson and those resulting from the W-boson-to-tau-lepton decay chain. This results in a precise measurement of the ratio between the probability for the W boson decay to tau to the probability for its decay to muon. On the other hand, SM FCNC involving the top-quark decay to another up-type quark and a neutral boson are so small that any measurable branching ratio for such a decay is an indication of new physics. Two searches for FCNC couplings are presented. First, the search for the FCNC coupling between the top quark and the Higgs boson uses events with one electron or muon, missing energy and three or four jets to search for both the production of a single top-quark in association with a Higgs boson or the production of a top-quark pair with one top quark decaying to a Higgs boson and an up or a charm quark. The results are interpreted also in terms of effective field theory couplings describing the tqH vertex. Finally, 81 fb−1 of integrated luminosity are used to search for FCNC via the coupling of a top quark, a photon and an up or charm quark in events with one photon, one lepton (electron or muon), one b-tagged jet and missing transverse momentum.
在大型强子对撞机(LHC)提供的最高质子-质子碰撞能量下,ATLAS探测器收集到的非常大的综合光度允许探测新物理的存在,这些新物理可能会打破已经建立的对称性,或者增强粒子物理标准模型(SM)中极其罕见的过程。两个这样重要的例子是轻子普适性和风味变化中性电流(FCNC)。由于在四标准差水平上观察到的偏差,最近涉及b介子衰变的测量引发了对测试tau和轻子之间轻子普适性的新兴趣。通过选择具有两个相反符号的轻子(介子对和电子-介子对)和至少两个b标记喷流的事件,组装了一个高度纯的顶夸克对衰变样本,并用于提取一个大的无偏W玻色子衰变到轻子的低横向动量样本。然后利用横向动量的二维分布和轻子的横向冲击参数的拟合来区分直接由W玻色子产生的轻子和由W玻色子到τ轻子衰变链产生的轻子。这使得W玻色子衰变为tau的概率与衰变为μ子的概率之间的比值得到了精确的测量。另一方面,涉及顶夸克衰变到另一个上型夸克和中性玻色子的SM FCNC是如此之小,以至于这种衰变的任何可测量的分支比都是新物理学的标志。给出了FCNC耦合的两种搜索方法。首先,寻找顶夸克和希格斯玻色子之间的FCNC耦合,使用带有一个电子或μ子、缺失能量和三个或四个喷流的事件来寻找与希格斯玻色子相关的单个顶夸克的产生,或由一个顶夸克衰变成希格斯玻色子和一个up或粲夸克的顶夸克对的产生。这些结果也用描述tqH顶点的有效场论耦合来解释。最后,利用81 fb−1的积分光度,通过一个顶夸克、一个光子和一个up夸克或粲夸克的耦合,在一个光子、一个轻子(电子或介子)、一个b标记射流和缺失横向动量的事件中寻找FCNC。
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引用次数: 0
Top quark pair and single top differential cross sections in CMS CMS中的顶夸克对和单顶微分截面
G. Bakas
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引用次数: 0
Design and Performance of the Belle II High Level Trigger 百丽II高电平触发器的设计与性能
M. Prim, N. Braun, Y. Guan, O. Hartbrich, R. Itoh, T. Konno, K. Lautenbach, C. Li, Z. Liu, M. Nakao, S. Park, S. Reiter, B. Spruck, S. Suzuki, S. Yamada, Jing-zhou Zhao, Qi-Dong Zhou
M. T. Prim,0,∗ N. Braun, Y. Guan, O. Hartbrich, R. Itoh, T. Konno, 5 K. Lautenbach, C. Li, Z-A. Liu, M. Nakao, SH. Park, 9 S. Reiter, B. Sprück, S. Y. Suzuki, S. Yamada, J. Zhao and Q. Zhou Universität Bonn Physikalisches Institut, Bonn, Germany Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany University of Cincinnati, Cincinnati, U.S.A University of Hawaii, Honolulu, U.S.A High Energy Accelerator Research Organization (KEK), Tsukuba, Japan 5 Kitasato University, Sagamihara, Japan Univeristy of Giessen, Giessen, Germany LiaoNing Normal University (LNNU), Dalian, China Insutitute of High Energy Physics (IHEP), Beijing, China Yonsei University, Seoul, Korea University of Mainz, Mainz, Germany E-mail: markus.prim@belle2.org
M. T. Prim,0, * N. Braun . Guan Y. Hartbrich, R. Itoh, T. Konno, 5 K。劳滕巴赫,C.李,z . a .。Liu, M. Nakao, SH. Park, 9 S. Reiter, B. spr ck, S. Y. Suzuki, S. Yamada, J. Zhao和Q. Zhou Universität波恩物理研究所,德国波恩卡尔斯鲁厄理工学院(KIT),卡尔斯鲁厄,德国辛辛那提大学,辛辛那提,美国夏威夷大学,檀香山,美国高能加速器研究组织(KEK),日本筑波5北中大学,相模原,日本吉森大学,吉森,德国辽宁师范大学(LNNU),大连,中国高能物理研究所,北京,中国延世大学,首尔,德国美因茨韩国大学E-mail: markus.prim@belle2.org
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引用次数: 0
期刊
Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)
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