The Jiangmen Underground Neutrino Observatory (JUNO), currently under construction in the south of China, will be the largest Liquid Scintillator (LS) detector in the world. JUNO is a multipurpose neutrino experiment designed to determine neutrino mass ordering, precisely measure oscillation parameters, and study solar neutrinos, supernova neutrinos, geo-neutrinos and atmospheric neutrinos [1]. The central detector of JUNO contains 20,000 tons of LS and about18,000 20-inch as well as 25,000 3-inch Photomultiplier Tubes (PMTs). The energy resolution is expected to be 3%/ √ E(MeV). To meet the requirements of the experiment, two algorithms for the vertex reconstruction have been developed. One is the maximum likelihood method which utilizes the time and charge information of PMTs with good understanding of the complicated optical processes in the LS. The other is the deep learning method with the Convolutional Neural Networks, which is fast and avoids the details of optical processes. In this proceeding, we will present the current status of the two algorithms and their performance will also be discussed based on simulation data.
{"title":"Vertex Reconstruction in JUNO","authors":"Zi-Yuan Li","doi":"10.22323/1.390.0987","DOIUrl":"https://doi.org/10.22323/1.390.0987","url":null,"abstract":"The Jiangmen Underground Neutrino Observatory (JUNO), currently under construction in the south of China, will be the largest Liquid Scintillator (LS) detector in the world. JUNO is a multipurpose neutrino experiment designed to determine neutrino mass ordering, precisely measure oscillation parameters, and study solar neutrinos, supernova neutrinos, geo-neutrinos and atmospheric neutrinos [1]. The central detector of JUNO contains 20,000 tons of LS and about18,000 20-inch as well as 25,000 3-inch Photomultiplier Tubes (PMTs). The energy resolution is expected to be 3%/ √ E(MeV). To meet the requirements of the experiment, two algorithms for the vertex reconstruction have been developed. One is the maximum likelihood method which utilizes the time and charge information of PMTs with good understanding of the complicated optical processes in the LS. The other is the deep learning method with the Convolutional Neural Networks, which is fast and avoids the details of optical processes. In this proceeding, we will present the current status of the two algorithms and their performance will also be discussed based on simulation data.","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":"73283281","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}
{"title":"Lepton Universality tests using semileptonic b-hadron decays","authors":"B. G. Plana","doi":"10.22323/1.390.0375","DOIUrl":"https://doi.org/10.22323/1.390.0375","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":"2021-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90513130","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}
To answer many questions still open in the field of Ultra-High-Energy Cosmic Rays, the Pierre Auger Collaboration started a significant upgrade of the Observatory, called AugerPrime. The main goal of the upgrade is to improve the mass composition sensitivity of the surface detector array on a shower-to-shower basis, in order to explore the cosmic ray composition at energies above 1019eV. At energies unexplored by terrestrial accelerators, it will be possible to study the properties of multi-particle production and to search for new or unexpected changes of hadronic interactions. Moreover, in the region of the suppression of the cosmic ray flux, charged particle astronomy will benefit from the knowledge of the fraction of light primaries for composition-selected anisotropy searches. After a discussion of the motivations for upgrading the Pierre Auger Observatory, a description of the detector upgrade is provided, together with an evaluation of the expected performance and the improved physics sensitivity. Finally the first data collected are presented.
{"title":"The AugerPrime Upgrade of the Pierre Auger Observatory.","authors":"G. Cataldi","doi":"10.22323/1.390.0727","DOIUrl":"https://doi.org/10.22323/1.390.0727","url":null,"abstract":"To answer many questions still open in the field of Ultra-High-Energy Cosmic Rays, the Pierre Auger Collaboration started a significant upgrade of the Observatory, called AugerPrime. The main goal of the upgrade is to improve the mass composition sensitivity of the surface detector array on a shower-to-shower basis, in order to explore the cosmic ray composition at energies above 1019eV. At energies unexplored by terrestrial accelerators, it will be possible to study the properties of multi-particle production and to search for new or unexpected changes of hadronic interactions. Moreover, in the region of the suppression of the cosmic ray flux, charged particle astronomy will benefit from the knowledge of the fraction of light primaries for composition-selected anisotropy searches. After a discussion of the motivations for upgrading the Pierre Auger Observatory, a description of the detector upgrade is provided, together with an evaluation of the expected performance and the improved physics sensitivity. Finally the first data collected are presented.","PeriodicalId":20428,"journal":{"name":"Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79970573","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}
Charged Lepton Flavor Violation (LFV) is a very clean probe of New Physics since it is forbidden in the Standard Model (SM). The observation of neutrino oscillation implies nonzero LFV rates, which however are highly suppressed by the smallness of neutrino masses. This makes LFV an appealing target of experimental searches, as its observation would unambiguously point to New Physics. In this proceedings, we will discuss the constraints on LFV effective operators that can be derived from LHC data on dilepton production. We will show that semileptonic operators can be constrained by existing searches of pp → `i`j (with i , j) at high-pT . We will explore the complementarity of these constraints with the ones obtained from low-energy observables, by showing, in particular, that LHC data provides the best constraints for several quark-flavor conserving effective coefficients, as well as for the ones that are relevant for charm physics.
由于在标准模型(SM)中是被禁止的，带电轻子味违和(LFV)是对新物理学的一个非常干净的探测。中微子振荡的观测意味着非零LFV速率，然而，这种速率被中微子质量的小而高度抑制。这使得LFV成为一个有吸引力的实验搜索目标，因为它的观测结果将明确地指向新物理学。在这篇论文中，我们将讨论从LHC双轻子产生数据中推导出的LFV有效算子的约束条件。我们将证明，在高pt下，半光子算子可以被pp→' i ' j (with i, j)的现有搜索约束。我们将探索这些约束与从低能观测得到的约束的互补性，特别是通过展示LHC数据为几个夸克味守恒有效系数以及与粲物理相关的有效系数提供了最佳约束。
{"title":"Lepton Flavor Violation and Dilepton Tails at the LHC","authors":"O. Sumensari","doi":"10.22323/1.390.0428","DOIUrl":"https://doi.org/10.22323/1.390.0428","url":null,"abstract":"Charged Lepton Flavor Violation (LFV) is a very clean probe of New Physics since it is forbidden in the Standard Model (SM). The observation of neutrino oscillation implies nonzero LFV rates, which however are highly suppressed by the smallness of neutrino masses. This makes LFV an appealing target of experimental searches, as its observation would unambiguously point to New Physics. In this proceedings, we will discuss the constraints on LFV effective operators that can be derived from LHC data on dilepton production. We will show that semileptonic operators can be constrained by existing searches of pp → `i`j (with i , j) at high-pT . We will explore the complementarity of these constraints with the ones obtained from low-energy observables, by showing, in particular, that LHC data provides the best constraints for several quark-flavor conserving effective coefficients, as well as for the ones that are relevant for charm physics.","PeriodicalId":20428,"journal":{"name":"Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90960255","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}
The ATLAS experiment at the LHC can record about 1 kHz of physics collisions, out of an LHC design bunch crossing rate of 40MHz. To achieve a high selection efficiency for rare physics events (such as beyond the StandardModel physics) while reducing the large background rate, a two-level trigger system is used. The event selection is based on physics signatures, such as the presence of energetic leptons, photons, jets or missing energy. In addition, the trigger system exploits algorithms using topological information and multivariate methods to carry out the filtering for the many physics analyses pursued by the ATLAS collaboration. In Run 2, around 1500 individual selections, the trigger chains, are included in the trigger menu specifying the selection algorithms to be used for data taking. Trigger menus must reflect the physics goals for a given data-taking period, taking the instantaneous luminosity of the LHC and limitations from the ATLAS detector readout and offline processing farm into account. An overview of the 2015–2018 trigger system and its performance is presented.
{"title":"Triggering in the ATLAS Experiment","authors":"J. Berlingen","doi":"10.22323/1.390.0756","DOIUrl":"https://doi.org/10.22323/1.390.0756","url":null,"abstract":"The ATLAS experiment at the LHC can record about 1 kHz of physics collisions, out of an LHC design bunch crossing rate of 40MHz. To achieve a high selection efficiency for rare physics events (such as beyond the StandardModel physics) while reducing the large background rate, a two-level trigger system is used. The event selection is based on physics signatures, such as the presence of energetic leptons, photons, jets or missing energy. In addition, the trigger system exploits algorithms using topological information and multivariate methods to carry out the filtering for the many physics analyses pursued by the ATLAS collaboration. In Run 2, around 1500 individual selections, the trigger chains, are included in the trigger menu specifying the selection algorithms to be used for data taking. Trigger menus must reflect the physics goals for a given data-taking period, taking the instantaneous luminosity of the LHC and limitations from the ATLAS detector readout and offline processing farm into account. An overview of the 2015–2018 trigger system and its performance is presented.","PeriodicalId":20428,"journal":{"name":"Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87161052","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}
The Mu2e experiment aims to find charged lepton flavor violation(CLFV) by measuring the monochromatic electrons from μ−N → e−N conversion with an unprecedented single event sensitivity of 3 × 10−17. When completed, the experiment will improve the current limit by four orders of magnitude and make a previously unexplored phase space available for the search for beyond the standard model physics. Physics motivation for the experiment is discussed and design choices for the detectors and various sub systems are explained in this document. The construction of the Mu2e experiment is well underway and commissioning will begin in late 2022 with first data taking in late 2025 and 4-5 years of data taking thereafter to reach our goal.
{"title":"Muon to electron conversion search in the presence of Al nuclei at the Fermilab Mu2e experiment: Motivation, Design and Progress","authors":"M. Yucel","doi":"10.22323/1.390.0439","DOIUrl":"https://doi.org/10.22323/1.390.0439","url":null,"abstract":"The Mu2e experiment aims to find charged lepton flavor violation(CLFV) by measuring the monochromatic electrons from μ−N → e−N conversion with an unprecedented single event sensitivity of 3 × 10−17. When completed, the experiment will improve the current limit by four orders of magnitude and make a previously unexplored phase space available for the search for beyond the standard model physics. Physics motivation for the experiment is discussed and design choices for the detectors and various sub systems are explained in this document. The construction of the Mu2e experiment is well underway and commissioning will begin in late 2022 with first data taking in late 2025 and 4-5 years of data taking thereafter to reach our goal.","PeriodicalId":20428,"journal":{"name":"Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90252748","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}
ATLAS electron and photon triggers covering transverse energies from 4.5 GeV to several TeV are essential to record signals for a wide variety of physics: from Standard Model processes to searches for new phenomena. During Run-3 (2021-2024) main triggers used for those physics studies will be a single-electron trigger with ET threshold around 25 GeV and a diphoton trigger with thresholds at 25 and 35 GeV. Relying on these simple general-purpose triggers is a robust strategy that has already been tested during Run-2 (2015–2018) and avoids using a large number of analysis-specific triggers, albeit at the cost of slightly higher trigger output rates. In preparation for Run-3 data-taking, the Level-1 trigger hardware of the ATLAS calorimeter is being upgraded and the trigger software is being migrated to the multi-threaded AthenaMT framework. Impact from these modifications on the electron and photon triggers as well as their projected performance in Run-3 is presented.
{"title":"Projected ATLAS Electron and Photon Trigger Performance in Run 3","authors":"F. Monticelli","doi":"10.22323/1.390.0757","DOIUrl":"https://doi.org/10.22323/1.390.0757","url":null,"abstract":"ATLAS electron and photon triggers covering transverse energies from 4.5 GeV to several TeV are essential to record signals for a wide variety of physics: from Standard Model processes to searches for new phenomena. During Run-3 (2021-2024) main triggers used for those physics studies will be a single-electron trigger with ET threshold around 25 GeV and a diphoton trigger with thresholds at 25 and 35 GeV. Relying on these simple general-purpose triggers is a robust strategy that has already been tested during Run-2 (2015–2018) and avoids using a large number of analysis-specific triggers, albeit at the cost of slightly higher trigger output rates. In preparation for Run-3 data-taking, the Level-1 trigger hardware of the ATLAS calorimeter is being upgraded and the trigger software is being migrated to the multi-threaded AthenaMT framework. Impact from these modifications on the electron and photon triggers as well as their projected performance in Run-3 is presented.","PeriodicalId":20428,"journal":{"name":"Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87875810","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}
The ATLAS Tile Calorimeter (TileCal), as a substantial part of the hadronic calorimeter system of the ATLAS detector, records energy deposits and jointly with other calorimeters reconstructs hadrons, jets, tau-particles and missing transverse energy. It also assists in muon identification. The TileCal is constructed out of alternating steel absorber layers and active scintillating tiles and covers region |η | < 1.7. Its operation is closely monitored by several systems, which were independently developed to meet distinct collaboration requirements. Any problem or indication of a problem is reported and immediately investigated, which resulted in data quality (DQ) efficiency close to 100% in the last several years. Although the TileCal tools are maintained and still being developed, the underlying technologies on which they were developed, especially web related tools, are becoming gradually outdated. The goal of the Tile-in-One (TiO) web platform is to integrate all the different TileCal DQ tools, independently developed over long period of time by different groups and individuals into one cohesive system without any non-necessary overlap in functionality. It is implemented as a collection of relatively small independent web applications designed for one specific task accessed through the main TiO server, which handles the authentication. Every application is isolated in its own virtual machine and is called plugin. Currently, the platform operates with several plugins in various stages of development and focuses not only on reimplementation of the old tools but also on creation of new ones. The implementation details of the Tile-in-One web platform, as well as a selection of plugins will be presented.
{"title":"Collection of web tools for ATLAS Tile Calorimeter data quality tasks","authors":"J. Smieško, Atlas Tile Calorimeter System","doi":"10.22323/1.390.0816","DOIUrl":"https://doi.org/10.22323/1.390.0816","url":null,"abstract":"The ATLAS Tile Calorimeter (TileCal), as a substantial part of the hadronic calorimeter system of the ATLAS detector, records energy deposits and jointly with other calorimeters reconstructs hadrons, jets, tau-particles and missing transverse energy. It also assists in muon identification. The TileCal is constructed out of alternating steel absorber layers and active scintillating tiles and covers region |η | < 1.7. Its operation is closely monitored by several systems, which were independently developed to meet distinct collaboration requirements. Any problem or indication of a problem is reported and immediately investigated, which resulted in data quality (DQ) efficiency close to 100% in the last several years. Although the TileCal tools are maintained and still being developed, the underlying technologies on which they were developed, especially web related tools, are becoming gradually outdated. The goal of the Tile-in-One (TiO) web platform is to integrate all the different TileCal DQ tools, independently developed over long period of time by different groups and individuals into one cohesive system without any non-necessary overlap in functionality. It is implemented as a collection of relatively small independent web applications designed for one specific task accessed through the main TiO server, which handles the authentication. Every application is isolated in its own virtual machine and is called plugin. Currently, the platform operates with several plugins in various stages of development and focuses not only on reimplementation of the old tools but also on creation of new ones. The implementation details of the Tile-in-One web platform, as well as a selection of plugins will be presented.","PeriodicalId":20428,"journal":{"name":"Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75679171","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}
Among the many possible probes to study the quark–gluon plasma (QGP), a high energy-density medium formed in relativistic heavy-ion collisions, heavy quarks are particularly interesting as they are expected to be produced in the initial stages of the collisions, by hard partonic scatterings, and to experience the full evolution of the medium. In particular, charmonia (bound 22̄ states) production have been measured in nucleus-nucleus collisions with high precision at the LHC leading to the observation of new signatures of deconfinement (QGP) such as the regeneration of 22̄ pairs into charmonium states. In this contribution, the latest ALICE results on the J/k nuclear modification factor ('AA) in Pb–Pb collisions at √ BNN = 5.02 TeV will be presented as a function of centrality, J/k ?T, and rapidity. This will be complemented by a discussion of the recent results on the elliptic and triangular flow coefficients of inclusive J/k which can be inherited from flowing charm quarks. In addition, results on J/k and k(2() measurements in p–Pb collisions at BNN = 5.02 and 8.16 TeV will be presented as a tool to study cold nuclear matter effects which may alter the quarkonium production in heavy-ion collisions. All the shown results will be compared to various theoretical calculations.
{"title":"Measurement of charmonium production in Pb-Pb and p-Pb collisions at the LHC with ALICE","authors":"A. Neagu","doi":"10.22323/1.390.0557","DOIUrl":"https://doi.org/10.22323/1.390.0557","url":null,"abstract":"Among the many possible probes to study the quark–gluon plasma (QGP), a high energy-density medium formed in relativistic heavy-ion collisions, heavy quarks are particularly interesting as they are expected to be produced in the initial stages of the collisions, by hard partonic scatterings, and to experience the full evolution of the medium. In particular, charmonia (bound 22̄ states) production have been measured in nucleus-nucleus collisions with high precision at the LHC leading to the observation of new signatures of deconfinement (QGP) such as the regeneration of 22̄ pairs into charmonium states. In this contribution, the latest ALICE results on the J/k nuclear modification factor ('AA) in Pb–Pb collisions at √ BNN = 5.02 TeV will be presented as a function of centrality, J/k ?T, and rapidity. This will be complemented by a discussion of the recent results on the elliptic and triangular flow coefficients of inclusive J/k which can be inherited from flowing charm quarks. In addition, results on J/k and k(2() measurements in p–Pb collisions at BNN = 5.02 and 8.16 TeV will be presented as a tool to study cold nuclear matter effects which may alter the quarkonium production in heavy-ion collisions. All the shown results will be compared to various theoretical calculations.","PeriodicalId":20428,"journal":{"name":"Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81848233","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}
{"title":"CMS electron and photon performance at Run 2 and prospects for Run 3","authors":"L. Soffi","doi":"10.22323/1.390.0780","DOIUrl":"https://doi.org/10.22323/1.390.0780","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":"2021-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73248963","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}
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