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Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)最新文献

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Searches for heavy particles with leptons at ATLAS 在ATLAS上搜索带有轻子的重粒子
Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-02-22 DOI: 10.22323/1.390.0279
F. Scutti
{"title":"Searches for heavy particles with leptons at ATLAS","authors":"F. Scutti","doi":"10.22323/1.390.0279","DOIUrl":"https://doi.org/10.22323/1.390.0279","url":null,"abstract":"","PeriodicalId":20428,"journal":{"name":"Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78833435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Observation of light-by-light scattering and search for axion-like particles with the CMS experiment 用CMS实验观察逐光散射和寻找轴子样粒子
Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-02-22 DOI: 10.22323/1.390.0296
R. Böttger
{"title":"Observation of light-by-light scattering and search for axion-like particles with the CMS experiment","authors":"R. Böttger","doi":"10.22323/1.390.0296","DOIUrl":"https://doi.org/10.22323/1.390.0296","url":null,"abstract":"Evidence for the light-by-light scattering process, γγ → γγ, in ultraperipheral PbPb collisions at a centre-of-mass energy per nucleon pair of 5.02 TeV was reported by the CMS Collaboration at the LHC based on a data sample corresponding to an integrated luminosity of 390 μb. Light-by-light scattering processes were selected from the events in which only two photons are exclusively produced, each with transverse energy ET γ > 2 GeV, pseudorapidity | η | < 2.4, diphoton invariant mass m > 5 GeV, diphoton transverse momentum pT γγ < 1 GeV, and diphoton acoplanarity below A < 0.01. 14 events were observed after all selection criteria, compared to expectations of 9.0 ± 0.9 (theo) events for the signal and 4.0 ± 1.2 (stat) for the background processes. The excess observed in data relative to the background-only expectation corresponds to a significance of 3.7 standard deviations and has properties consistent with those expected for the light-by-light scattering signal. The measured fiducial light-by-light scattering cross section, σfid(γγ → γγ) = 120 ± 46 (stat) ± 28 (syst) ± 12 (theo) nb, is consistent with the Standard Model prediction. The m distribution was used to set constraints on the production of pseudoscalar axion-like particles via the γγ → a → γγ process in the mass range ma = 5–90 GeV.","PeriodicalId":20428,"journal":{"name":"Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78111668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Probing Baryogenesis using Neutron-Anti-Neutron Oscillation 利用中子-反中子振荡探测重子发生
Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-02-22 DOI: 10.22323/1.390.0243
Kåre Fridell, J. Harz, C. Hati
{"title":"Probing Baryogenesis using Neutron-Anti-Neutron Oscillation","authors":"Kåre Fridell, J. Harz, C. Hati","doi":"10.22323/1.390.0243","DOIUrl":"https://doi.org/10.22323/1.390.0243","url":null,"abstract":"Neutron-anti-neutron (=− =̄) oscillation is a baryon number violating process that requires physics beyond the Standard model. Future experiments at ESS and DUNE aim to either discover (= − =̄) oscillation or to put more stringent constraints on the oscillation time. We study the impact of such a discovery on different baryogenesis scenarios using an effective field theory framework for (= − =̄) oscillation. We also study the implications of observing the mediators at the LHC and the possibility of falsifying some of the baryogenesis scenarios in the context of some simplified UV complete scenarios.","PeriodicalId":20428,"journal":{"name":"Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82879153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Mu3e Experiment Searching for the Lepton Flavour Violating Decay μ+ → e+e+e− 寻找违反衰变μ+→e+e+e−的轻子味的Mu3e实验
Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-02-22 DOI: 10.22323/1.390.0898
Afaf Wasili
{"title":"The Mu3e Experiment Searching for the Lepton Flavour Violating Decay μ+ → e+e+e−","authors":"Afaf Wasili","doi":"10.22323/1.390.0898","DOIUrl":"https://doi.org/10.22323/1.390.0898","url":null,"abstract":"The Mu3e experiment is a novel experiment to search for the lepton flavour violating (LFV) decay μ+ → e+e−e+, with an ultimate sensitivity to a branching ratio of one in 2×10^15 in phase I and one in 10^16 muon decays for phase II. This is an improvement in sensitivity by four orders of magnitude compared to previous searches by the SINDRUM experiment. Since this decay is suppressed to unobservable levels in the Standard Model of particle physics, any measurement of this decay would be a clear sign of new physics. The experiment is currently under construction and will take place at the Paul Scherrer Institute in Switzerland. In order to achieve this number of muon decays, the Paul Scherrer Institute (PSI) is utilizing the worlds most intense proton beam, which is used to produce very intense 10^8 μ/s at πE5 beamline (phase I) and a new high-intensity muon beam line HiMB is providing 10^9 μ/s (phase II). To achieve the proposed sensitivity, the Mu3e experiment requires excellent vertex, timing and momentum resolutions. These are needed to reduce the main background processes, such as Internal conversion and accidental coincidences caused by two or more Michel decays. This paper will present an overview of the Mu3e experiment with the performance of the phase I Mu3e detector, and how this sensitivity is achieved by high voltage monolithic active pixel sensors for high spatial resolution and scintillating fibres and tiles providing precise timing information at high particle rates.","PeriodicalId":20428,"journal":{"name":"Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88899317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
The mass production and batch test result of the 15K 20-inch MCP-PMT in NNVT for JUNO JUNO 15K 20英寸MCP-PMT在NNVT的量产和批量测试结果
Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-02-22 DOI: 10.22323/1.390.0771
S. Qian, Wu Qi, Cao Yiqi, Chen Pengyu, Huang Guorui, Jin Muchun, Jin Zhen, Li Dong, L. Haitao, L. Kun, Liu Shulin, Li Zhen, Ma Lishuang, Peng Shuo, Ren Ling, Si Shuguang, Su Detan, Su Jianning, Wang Xingchao
{"title":"The mass production and batch test result of the 15K 20-inch MCP-PMT in NNVT for JUNO","authors":"S. Qian, Wu Qi, Cao Yiqi, Chen Pengyu, Huang Guorui, Jin Muchun, Jin Zhen, Li Dong, L. Haitao, L. Kun, Liu Shulin, Li Zhen, Ma Lishuang, Peng Shuo, Ren Ling, Si Shuguang, Su Detan, Su Jianning, Wang Xingchao","doi":"10.22323/1.390.0771","DOIUrl":"https://doi.org/10.22323/1.390.0771","url":null,"abstract":"The Jiangmen Underground Neutrino Observatory (JUNO) in China aiming to determine the neutrino mass hierarchy is under construction and the 15,000 MCP-PMTs produced in NNVT, which will be installed as the central liquid scintillator detector of JUNO, have been completed and delivered by August of 2020. During the mass production process, breakthrough of the photocathode technology greatly improved the quantum efficiency (QE) of the MCP-PMT from 30% to 35% and so the detection efficiency (DE) has been improved. The performance of other parameters keeps steady during the mass production process of 15,000 MCP-PMTs. The average QE at 400 nm for the 15,000 pieces of MCP-PMTs is 32%. With a layer of high-SEY material deposited on the MCP, the collection efficiency can reach nearly 100% and the average DE at 400 nm for the 15k pieces of MCP-PMTs is 31.5%.","PeriodicalId":20428,"journal":{"name":"Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77685271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Implementation of large imaging calorimeters 实施大型成像量热计
Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-02-22 DOI: 10.22323/1.390.0823
V. Boudry
{"title":"Implementation of large imaging calorimeters","authors":"V. Boudry","doi":"10.22323/1.390.0823","DOIUrl":"https://doi.org/10.22323/1.390.0823","url":null,"abstract":"The next generation of collider detectors will make full use of Particle Flow algorithms, requiring high precision tracking and imaging calorimeters. Featuring a granularity by 2 to 3 orders of magnitude higher than existing devices, imaging calorimetry has been developed during the past 15 years by the CALICE collaboration and is now reaching maturity. The stateof-the-art status and the remaining challenges are reviewed here for all investigated sensor types: silicon diode and scintillator for electromagnetic calorimeters, gaseous with semi-digital readout, and scintillator with SiPM readout for hadronic ones. An overview of recent commissioning and beam test results of large-scale technological prototypes and raw performances such as energy resolution, linearity, and studies exploiting the distinct features of granular calorimeters regarding pattern recognition is presented. Beyond these prototypes, the design of experiments addressing the requirements and potential of imaging calorimetry is discussed.","PeriodicalId":20428,"journal":{"name":"Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81256974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Search for excited leptons in CMS 在CMS中寻找激发轻子
Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-02-22 DOI: 10.22323/1.390.0304
K. Hoepfner
{"title":"Search for excited leptons in CMS","authors":"K. Hoepfner","doi":"10.22323/1.390.0304","DOIUrl":"https://doi.org/10.22323/1.390.0304","url":null,"abstract":"Compositeness models are a popular explanation for the observed three generations of standard model (SM) particles. One consequence of compositeness would be the observation of excited leptons, such as excited electrons, e*, or excited muons, *. At the LHC such particles could be produced in pp collisions under the assumption that leptons are composite objects. Produced excited leptons are expected to transition to their corresponding SM lepton partner via gauge or via contact interaction. CMS has performed a recent search for e* and * in the contact interaction decay channel leading to a two-lepton plus two-jets final state using the 2016 and 2017 sqrt(s) = 13 TeV dataset. While no signal was observed, the exclusion results provide the best limits to date. The poster also compares to other complementary search channels and discusses the greater context of excited leptons searches.","PeriodicalId":20428,"journal":{"name":"Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84518342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development and Test of a Micro-Pattern Resistive Plate Detector. 微模式电阻板探测器的研制与测试。
Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-02-22 DOI: 10.22323/1.390.0850
P. Iengo
{"title":"Development and Test of a Micro-Pattern Resistive Plate Detector.","authors":"P. Iengo","doi":"10.22323/1.390.0850","DOIUrl":"https://doi.org/10.22323/1.390.0850","url":null,"abstract":"We present the design and preliminary tests of a resistive strip device built with techniques developed for micro-pattern gaseous detectors. It consists of two equal electrode plates made of FR4 substrate with 250 Cu readout strips. A 50 μm insulating foil, carrying resistive lines, is glued on top of the substrate. Both the Cu and the resistive strips have a pitch of 400 μm and width of 300 μm. The plates are spaced by a 2 mm gap and rotated by 90◦ providing 2D tracking capability. With such a device the surface resistivity can be tuned to values below the ones of existing RPC (either glass or phenolic-melamine). The thin separation layer between the electrodes and the readout strips provides a better capacitive coupling of the signal, allowing to operate the detector at lower gain. Moreover, the strip-shaped resistive pattern reduces the induced charge size in the direction perpendicular to the strips. All these features go in the direction of improving the rate capability. The basic concept of this new device will be presented together with results of preliminary tests ongoing at CERN.","PeriodicalId":20428,"journal":{"name":"Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89284550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Characterization of the muography background using the Muon Telescope (MuTe) 利用μ子望远镜(MuTe)表征微成像背景
Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-02-21 DOI: 10.22323/1.390.0984
J. Pena-Rodr'iguez, L. N'unez, Hernán Asorey
{"title":"Characterization of the muography background using the Muon Telescope (MuTe)","authors":"J. Pena-Rodr'iguez, L. N'unez, Hernán Asorey","doi":"10.22323/1.390.0984","DOIUrl":"https://doi.org/10.22323/1.390.0984","url":null,"abstract":"In this work, we estimate the background components in muography using the MuTe: a hybrid muon telescope composed of two subdetectors –a scintillator hodoscope and a Water Cherenkov Detector (WCD). The hodoscope records the trajectories of particles crossing the telescope, while the WCD measures their energy loss. The MuTe hodoscope reconstructs 3841 different directions with an angular resolution of 32 mrad for an inter-panel distance of 2.5 m. The spatial resolution can reach ∼ 25.6m assuming an 800m distance to the target. The WCD measures the deposited energy from 50 MeV to 1.5 GeV with a resolution of 0.72MeV. MuTe discriminates muography background sources such as: upward coming muons, scattered muons, the soft component of Extensive Air Showers (EAS), and particles arriving simultaneously. They are filtered by using measurements of deposited energy (WCD) and Time-of-Flight. The WCD differentiates single muons, electrons/positrons, and multiparticle events. On the other hand, the ToF measurements allow us to estimate the muon momentum establishing an energy threshold to decrease the","PeriodicalId":20428,"journal":{"name":"Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85534103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Quantum Track Reconstruction Algorithms for non-HEP applications 非hep应用的量子航迹重建算法
Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-02-21 DOI: 10.3929/ETHZ-B-000484722
Kristiane Novotny, Cenk Tüysüz, C. Rieger, D. Dobos, K. Potamianos, B. Demirkoz, F. Carminati, S. Vallecorsa, J. Vlimant, Fabio Fracas
{"title":"Quantum Track Reconstruction Algorithms for non-HEP applications","authors":"Kristiane Novotny, Cenk Tüysüz, C. Rieger, D. Dobos, K. Potamianos, B. Demirkoz, F. Carminati, S. Vallecorsa, J. Vlimant, Fabio Fracas","doi":"10.3929/ETHZ-B-000484722","DOIUrl":"https://doi.org/10.3929/ETHZ-B-000484722","url":null,"abstract":"The expected increase in simultaneous collisions creates a challenge for accurate particle track reconstruction in High Luminosity LHC experiments. Similar challenges can be seen in non-HEP trajectory reconstruction use-cases, where tracking and track evaluation algorithms are used. High occupancy, track density, complexity and fast growth therefore exponentially increase the demand of algorithms in terms of time, memory and computing resources. While traditionally Kalman filter (or even simpler algorithms) are used, they are expected to scale worse than quadratic and thus strongly increasing the total processing time. Graph Neural Networks (GNN) are currently explored for HEP, but also non HEP trajectory reconstruction applications. Quantum Computers with their feature of evaluating a very large number of states simultaneously are therefore good candidates for such complex searches in large parameter and graph spaces. In this paper we present our work on implementing a quantum-based graph tracking machine learning algorithm to evaluate Traffic collision avoidance system (TCAS) probabilities of commercial flights.","PeriodicalId":20428,"journal":{"name":"Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73175675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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