Proceedings of XXIX International Symposium on Lepton Photon Interactions at High Energies

European Particle Physics Strategy Update 欧洲粒子物理战略更新

Proceedings of XXIX International Symposium on Lepton Photon Interactions at High Energies — PoS(LeptonPhoton2019) Pub Date : 2019-11-15 DOI: 10.22323/1.367.0044

Brigitte Vachon

引用次数: 1

Decay of a bound muon to a bound electron 被束缚的介子向被束缚的电子的衰变

Proceedings of XXIX International Symposium on Lepton Photon Interactions at High Energies — PoS(LeptonPhoton2019) Pub Date : 2019-11-14 DOI: 10.22323/1.367.0148

M. Aslam, A. Czarnecki, A. Morozova, Guangpeng Zhang

引用次数: 0

Searches for ultra long-lived particles with MATHUSLA 用MATHUSLA搜索超长寿命粒子

Proceedings of XXIX International Symposium on Lepton Photon Interactions at High Energies — PoS(LeptonPhoton2019) Pub Date : 2019-11-14 DOI: 10.22323/1.367.0115

M. Diamond

{"title":"Searches for ultra long-lived particles with MATHUSLA","authors":"M. Diamond","doi":"10.22323/1.367.0115","DOIUrl":"https://doi.org/10.22323/1.367.0115","url":null,"abstract":"With the current experiments at particle accelerators, no search strategy will be able to observe the decay of neutral long-lived particles with masses above ∼ GeV and lifetimes at the limit set by Big Bang Nucleosynthesis (BBN), c τ ∼ 10 7 –10 8 m. The MATHUSLA detector concept (MAssive Timing Hodoscope for Ultra-Stable neutraL pArticles) will be presented. It can be implemented on the surface above the ATLAS or CMS detectors in time for the high-luminosity LHC operations, to search for neutral long-lived particles with lifetimes up to the BBN limit. The large area of the detector allows MATHUSLA to make important contributions also to cosmic ray physics. We will also report on the analysis of data collected by the test stand installed on the surface above the ATLAS detector, the ongoing background studies, and plans for the MATHUSLA detector. The observation of neutral long-lived particles at the LHC would reveal physics beyond the Standard Model and could account for the many open issues in our understanding of our universe. Long-lived particle signatures are well motivated and can appear in many theoretical constructs that address the Hierarchy Problem, Dark Matter, Neutrino Masses and the Baryon Asymmetry of the Universe.","PeriodicalId":163721,"journal":{"name":"Proceedings of XXIX International Symposium on Lepton Photon Interactions at High Energies — PoS(LeptonPhoton2019)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122122075","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

Scintillation light production, propagation and detection in the 4-ton dual-phase LAr-TPC demonstrator (data analysis and simulations) 4吨双相LAr-TPC演示器中闪烁光的产生、传播和检测(数据分析和模拟)

Proceedings of XXIX International Symposium on Lepton Photon Interactions at High Energies — PoS(LeptonPhoton2019) Pub Date : 2019-11-14 DOI: 10.22323/1.367.0156

C. Lastoria

{"title":"Scintillation light production, propagation and detection in the 4-ton dual-phase LAr-TPC demonstrator (data analysis and simulations)","authors":"C. Lastoria","doi":"10.22323/1.367.0156","DOIUrl":"https://doi.org/10.22323/1.367.0156","url":null,"abstract":"The Deep Underground Neutrino Experiment (DUNE) Far Detector (FD) will be formed by four 10-kton Liquid Argon (LAr) Time Projection Chambers (TPC) using both single and dual-phase technology. The dual-phase technology foreseen the charge amplification in the gas phase before the signal collection and is following a staged approach to demonstrate its feasibility at the DUNE FD scale. In 2017, a 4-ton demonstrator of 3x1x1 m$^3$ volume was exposed to cosmic muons and demonstrated expected performance in terms of charge extraction and light collection. A bigger prototype (ProtoDUNE-DP), with an active volume of 6x6x6 m$^3$, is currently under commissioning at CERN. The photon detection system in these detectors is crucial to provide the trigger signal giving an absolute time reference for the charge acquisition system of rare non-beam events, and to provide complementary calorimetry. An overview of the analysis of the light collected in the 4-ton demonstrator has been presented. These prototypes confirmed the performance of the light detection system to provide trigger based on the scintillation light signal, to characterize the LAr response to the crossing muons and to monitor the LAr purity. The analyzed data are compared with MC simulations to improve the values of less understood LAr optical parameters such as the Rayleigh scattering length.","PeriodicalId":163721,"journal":{"name":"Proceedings of XXIX International Symposium on Lepton Photon Interactions at High Energies — PoS(LeptonPhoton2019)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121596873","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 Phase-II upgrade of the ATLAS Muon Spectrometer ATLAS μ子光谱仪的二期升级

Proceedings of XXIX International Symposium on Lepton Photon Interactions at High Energies — PoS(LeptonPhoton2019) Pub Date : 2019-11-13 DOI: 10.22323/1.367.0070

Junjie Zhu

引用次数: 0

Measurements of the Higgs boson decays to two bottom quarks 测量希格斯玻色子衰变为两个底夸克

Proceedings of XXIX International Symposium on Lepton Photon Interactions at High Energies — PoS(LeptonPhoton2019) Pub Date : 2019-11-13 DOI: 10.22323/1.367.0085

L. Ambroz

引用次数: 0

Observation of new charmonium (-like) decays 新的类钐(charmonium)衰变的观察

Proceedings of XXIX International Symposium on Lepton Photon Interactions at High Energies — PoS(LeptonPhoton2019) Pub Date : 2019-11-13 DOI: 10.22323/1.367.0160

Tong Liu

引用次数: 0

Outreach Activities in High Energy Physics 高能物理拓展活动

Proceedings of XXIX International Symposium on Lepton Photon Interactions at High Energies — PoS(LeptonPhoton2019) Pub Date : 2019-11-13 DOI: 10.22323/1.367.0036

Ketevi Assagman

引用次数: 0

Neutrino CP Violation with the European Spallation Source neutrino Super Beam project 欧洲散裂源中微子超级束流项目对中微子CP的破坏

Proceedings of XXIX International Symposium on Lepton Photon Interactions at High Energies — PoS(LeptonPhoton2019) Pub Date : 2019-11-13 DOI: 10.22323/1.367.0137

M. Dracos

{"title":"Neutrino CP Violation with the European Spallation Source neutrino Super Beam project","authors":"M. Dracos","doi":"10.22323/1.367.0137","DOIUrl":"https://doi.org/10.22323/1.367.0137","url":null,"abstract":"After measuring in 2012 a relatively large value of the neutrino mixing angle $theta_{13}$, the door is now open to observe for the first time a possible CP violation in the leptonic sector. \u0000The measured value of $theta_{13}$ privileges the 2nd oscillation maximum for the discovery of CP violation instead of the usually used 1st oscillation maximum. \u0000The sensitivity at this 2nd oscillation maximum is about three times higher than for the 1st oscillation maximum inducing a lower sensitivity to systematic errors. \u0000Going to the 2nd oscillation maximum necessitates a very intense neutrino beam with the appropriate energy. \u0000The world's most intense pulsed spallation neutron facility, the European Spallation Source, will have a proton linac with 5 MW power and 2 GeV energy. \u0000This linac, under construction, also has the potential to become the proton driver of the world's most intense neutrino beam with very high probability to discover a neutrino CP violation. \u0000The physics performance of this neutrino Super Beam in conjunction with a megaton underground Water Cherenkov detector installed at a distance of about 500~km from ESS, has been evaluated. \u0000In addition, the choice of such detector will extent the physics program to proton--decay, atmospheric neutrinos and astrophysics searches. \u0000The ESS proton linac upgrades, the accumulator ring needed for proton pulse compression, the target station and the physics potential are described. In addition to neutrinos, this facility will also produce at the same time a copious number of muons which could be used by a muon collider. \u0000The ESS neutron facility will be fully ready by 2025 at which moment the upgrades for the neutrino facility could start.","PeriodicalId":163721,"journal":{"name":"Proceedings of XXIX International Symposium on Lepton Photon Interactions at High Energies — PoS(LeptonPhoton2019)","volume":"199 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134262986","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 ATLAS Hardware Track Trigger design towards first prototypes ATLAS硬件跟踪触发器的第一个原型设计

Proceedings of XXIX International Symposium on Lepton Photon Interactions at High Energies — PoS(LeptonPhoton2019) Pub Date : 2019-11-12 DOI: 10.22323/1.367.0166

A. L. Carvalho

{"title":"The ATLAS Hardware Track Trigger design towards first prototypes","authors":"A. L. Carvalho","doi":"10.22323/1.367.0166","DOIUrl":"https://doi.org/10.22323/1.367.0166","url":null,"abstract":"In the High-Luminosity LHC, planned to start with Run 4 in 2026, the ATLAS experiment will be equipped with the Hardware Track Trigger (HTT), a dedicated hardware system able to reconstruct tracks in the silicon detectors with short latency. This HTT will be composed of about 700 ATCA boards, based on new technologies available on the market, like high-speed links and powerful FPGAs, as well as custom-designed Associative Memory ASIC (AM), which are an evolution of those used extensively in previous experiments and in the ATLAS Fast Tracker (FTK). The HTT is designed to cope with the expected extreme high luminosity in the so called \"L0 only\" scenario, where HTT will operate at the L0 rate (1 MHz). It will provide good quality tracks to the software-based High-Level-Trigger (HLT), operating as coprocessor. It will allow for a reduction of the HLT farm size by a factor of 10, by lightening the load of the software tracking. All ATLAS upgrade projects are also designed for an evolved, so-called \"L0/L1\" architecture, where part of HTT is used in a low-latency mode (L1Track), providing tracks in regions of ATLAS at a rate of up to 4 MHz, with a latency of a few micro-seconds. This second phase poses very stringent requirements on the latency budget and to the dataflow rates. All the requirements and the specifications of this system have been assessed. The design of all the components has been reviewed and validated with preliminary simulation studies. After these validations are completed, the development of the first prototypes will start. In this paper we describe the status of the design review, highlighting the technical challenges and required specifications, towards the preparation of the first slice tests with real prototypes.","PeriodicalId":163721,"journal":{"name":"Proceedings of XXIX International Symposium on Lepton Photon Interactions at High Energies — PoS(LeptonPhoton2019)","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126736506","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

Proceedings of XXIX International Symposium on Lepton Photon Interactions at High Energies — PoS(LeptonPhoton2019)最新文献