The CMS groups in the USA are actively involved in several grid-elated projects,including the DoE-funded Particle Physics Data Grid(PPDG)and the NSFfunded Grid Physics Network(GriPhyN).We present developments of :the ...The CMS groups in the USA are actively involved in several grid-elated projects,including the DoE-funded Particle Physics Data Grid(PPDG)and the NSFfunded Grid Physics Network(GriPhyN).We present developments of :the Grid data Management Pilot (GDMP) software;a Java Analysis Studio-based prototype remote analysis service for CMS data;tools for automating job submission schemes for large scale distributed simulation and reconstruction runs for CMS;modeling and development of job scheduling schemes using the MONARC toolkit;a robust execution service for distributed processors.The deployment and use of these tools at prototype Tier1 and Tier2 computing centers in the USA is described.展开更多
CMS physicists need to seamlessly access their experimental data and results,independent of location and storage medium,in order to focus on the exploration for the new physics signals arther than the complexities of ...CMS physicists need to seamlessly access their experimental data and results,independent of location and storage medium,in order to focus on the exploration for the new physics signals arther than the complexities of worldwide data management .In order to achieve this goal,CMS has adopted a tiered worldwide computing model which will incorporate emerging Grid technology.CMS has started to use Grid tools for data processing,replication and migration,Important Grid components are expected to be delivered by the Data Grid projects.like projects,CMS has created a set of long-term requirements to the Grid projects.These requirements are presented and discussed.展开更多
One of the key components of any grid architecture is managing compute and storage resources and optimizing their utilization.SAM has implemented features that allow it to exercise a "fair share" and "p...One of the key components of any grid architecture is managing compute and storage resources and optimizing their utilization.SAM has implemented features that allow it to exercise a "fair share" and "prioritized" policy among many groups of users.The goals are as follows:1)implement th experiments policies for resource usage by research group and by data access mode,and 2) optimize the resource usage to maximize the overall throughput defined in terms of real data processing activity,At the lowest level of SAM architecture,called the station,the SAM system integrates the data delivery and cache management with the job control and scheduling of the batch system.At the site-level,for example at Fermilab,requests for data from on-site stations are managed to optimize Mass Storage System resources and network throughput,Management of resources at a various geographic levels are discussed.展开更多
The Terabyte Analysis Machine Project is Developing hardware and software to analyze Terabyte scale datasets.The Distance Machine framework provides facilities to flexibly interface application specific indexing and p...The Terabyte Analysis Machine Project is Developing hardware and software to analyze Terabyte scale datasets.The Distance Machine framework provides facilities to flexibly interface application specific indexing and partitioning algorthms to large scientific databases.展开更多
SAM is a network-distributed data management system developed at Fermilab for use with Run II data,It is being Employed by the D0 Experiment to store,manage,deliver,and track processing of all data.We describe the de...SAM is a network-distributed data management system developed at Fermilab for use with Run II data,It is being Employed by the D0 Experiment to store,manage,deliver,and track processing of all data.We describe the design and features of the system including resource management and data transfer mechanisms,We show the operational experience D0 has accumulated to date including data acquisition processing,and all levels of access and delivery.We present various configurations of the system and describe their use in the collaboration.展开更多
In this paper,we discuss the CDF Run Ⅱ Run Control and online event monitoring system.Run Control is the top level application that controls the data acquisition activities across 150 front end VME crates and related...In this paper,we discuss the CDF Run Ⅱ Run Control and online event monitoring system.Run Control is the top level application that controls the data acquisition activities across 150 front end VME crates and related service processes,Run Control is a real-time multi-threaded application implemented in Java with flexible state machines,using JDBC database connections to configure clients,and including a user friendly and powerful graphical user interface.The CDF online event monitoring system consists of several parts;the eent monitoring programs,the display to browse their results,the server program which communicates with the display via socket connections ,the error receiver which displays error messages and communicates with run Control,and the state manager which monitors the state of the monitor programs.展开更多
In this paper we highlight strategies and choices that make the Dφ Data Handling system markedly different from many other experiments' systems,We emphasize how far the Dφ system has come in innovating and imp...In this paper we highlight strategies and choices that make the Dφ Data Handling system markedly different from many other experiments' systems,We emphasize how far the Dφ system has come in innovating and implementing a Dφ-specific Data Grid system.We discuss experiences during the first months of detector commissioning and give some future plans for the system.展开更多
The simulation program developed by the "Models of Networked Analysis at Regional Centers"(MONARC) project is a powerful and flexible tool for simulating the behavior of large scale distributed computing sys...The simulation program developed by the "Models of Networked Analysis at Regional Centers"(MONARC) project is a powerful and flexible tool for simulating the behavior of large scale distributed computing systems,In this study,we further validate this simulation tool in a large-scale distributed farm computing system.We also report the usage of this simulation tool to identify the bottlenecks and limitations of our farm system.展开更多
The Monte Carlo particle numbering scheme presented here is intended to facilitate interfacing between event generators, detector simulators, and analysis packages used in particle physics. The numbering scheme was in...The Monte Carlo particle numbering scheme presented here is intended to facilitate interfacing between event generators, detector simulators, and analysis packages used in particle physics. The numbering scheme was introduced in 1988 [1] and a revised version [2,3] was adopted in 1998 in order to allow systematic inclusion of quark model states which are as yet undiscovered and hypothetical particles such as SUSY particles. The numbering scheme is used in several event generators, e.g. HERWIG, PYTHIA, and SHERPA, and interfaces, e.g. /HEPEVT/and HepMC.展开更多
The discovery of unexpected properties of the Higgs boson would offer an intriguing opportunity to shed light on some of the most profound puzzles in particle physics. Beyond Standard Model（BSM） decays of the Higgs ...The discovery of unexpected properties of the Higgs boson would offer an intriguing opportunity to shed light on some of the most profound puzzles in particle physics. Beyond Standard Model（BSM） decays of the Higgs boson could reveal new physics in a direct manner. Future electron-positron lepton colliders operating as Higgs factories, including CEPC, FCC-ee and ILC, with the advantages of a clean collider environment and large statistics,could greatly enhance sensitivity in searching for these BSM decays. In this work, we perform a general study of Higgs exotic decays at future e^＋e^lepton colliders, focusing on the Higgs decays with hadronic final states and/or missing energy, which are very challenging for the High-Luminosity program of the Large Hadron Collider（HL-LHC）.We show that with simple selection cuts,O（10^-3-10^-5） limits on the Higgs exotic decay branching fractions can be achieved using the leptonic decaying spectator Z boson in the associated production mode e^＋e^-→ZH. We further discuss the interplay between detector performance and Higgs exotic decays, and other possibilities of exotic decays.Our work is a first step in a comprehensive study of Higgs exotic decays at future lepton colliders, which is a key area of Higgs physics that deserves further investigation.展开更多
Very recently, the Belle and BESIII experiments observed a new charmonium-like state X（3823）, which is a good candidate for tile D-wave charmonium （13D2）. Because the X（3823） is just near the DD＊ threshold, the...Very recently, the Belle and BESIII experiments observed a new charmonium-like state X（3823）, which is a good candidate for tile D-wave charmonium （13D2）. Because the X（3823） is just near the DD＊ threshold, the decay X（3823）→J/ψπ＋π- can be a golden channel to test the significance of coupled-channel effects. In this work, this decay is considered including both the hidden-charm dipion and the usual quantum chromodynamics multipole expansion （QCDME） contributions. The partial decay width, the dipion invari^nt mass spectrum distribution dF[X（3823） →J/ψπ＋π- /dmπ＋π-, and the corresponding dF[X（3823） →J/ψπ＋π-/d cosθ distribution are computed. Many param- eters are determined from exi：sting experimental data, so the results depend mainly only on one unknown phase between the QCDME and hidden-charm dipion amplitudes.展开更多
Neutrino cross sections are an essential ingredient in all neutrino experiments. Interest in neutrino scattering has recently increased due to the need for such information in the interpretation of neutrino oscillatio...Neutrino cross sections are an essential ingredient in all neutrino experiments. Interest in neutrino scattering has recently increased due to the need for such information in the interpretation of neutrino oscillation data. Historically, neutrino scattering results on both charged current （CC） and neutral current （NC） channels have been collected over many decades using a variety of targets, analysis techniques, and detector technologies. With the advent of intense neutrino sources constructed for neutrino oscillation investigations, experiments are now remeasuring these cross sections with a renewed appreciation for nuclear effects^T and the importance of improved neutrino flux estimations. This work summarizes accelerator-based neutrino cross section measurements performed in the ~ 0.1 -300 GeV range with an emphasis on inclusive, quasi-elastic, and pion production processes, areas where we have the most experimental input at present （Table 50.1 and Table 50.2）. For a more comprehensive discussion of neutrino cross sections, including neutrino-electron elastic scattering and lower energy neutrino measurements, the reoxter is directed to a recent review of this subject [1]. Here, we survey existing experimental data on neutrino interactions and do not attempt to provide a census of the associated theoretical calculations, which are both important and plentiful.展开更多
The W＇ boson is a massive hypothetical particle of spin 1 and electric charge ±1, which is a color singlet and is predicted in various extensions of the Standard Model （SM）.
The Z＇ boson is a massive, electrically-neutral and colorsinglet hypothetical particle of spin 1. This particle is predicted in many extensions of the Standard Model （SM） and has been the object of extensive phenom...The Z＇ boson is a massive, electrically-neutral and colorsinglet hypothetical particle of spin 1. This particle is predicted in many extensions of the Standard Model （SM） and has been the object of extensive phenomenological studies [1].展开更多
The last few years have been witness to a proliferation of new results concerning heavy exotic hadrons.Experimentally, many new signals have been discovered that could be pointing towards the existence of tetraquarks,...The last few years have been witness to a proliferation of new results concerning heavy exotic hadrons.Experimentally, many new signals have been discovered that could be pointing towards the existence of tetraquarks,pentaquarks, and other exotic configurations of quarks and gluons. Theoretically, advances in lattice field theory techniques place us at the cusp of understanding complex coupled-channel phenomena, modelling grows more sophisticated, and effective field theories are being applied to an ever greater range of situations. It is thus an opportune time to evaluate the status of the field. In the following, a series of high priority experimental and theoretical issues concerning heavy exotic hadrons is presented.展开更多
文摘The CMS groups in the USA are actively involved in several grid-elated projects,including the DoE-funded Particle Physics Data Grid(PPDG)and the NSFfunded Grid Physics Network(GriPhyN).We present developments of :the Grid data Management Pilot (GDMP) software;a Java Analysis Studio-based prototype remote analysis service for CMS data;tools for automating job submission schemes for large scale distributed simulation and reconstruction runs for CMS;modeling and development of job scheduling schemes using the MONARC toolkit;a robust execution service for distributed processors.The deployment and use of these tools at prototype Tier1 and Tier2 computing centers in the USA is described.
文摘CMS physicists need to seamlessly access their experimental data and results,independent of location and storage medium,in order to focus on the exploration for the new physics signals arther than the complexities of worldwide data management .In order to achieve this goal,CMS has adopted a tiered worldwide computing model which will incorporate emerging Grid technology.CMS has started to use Grid tools for data processing,replication and migration,Important Grid components are expected to be delivered by the Data Grid projects.like projects,CMS has created a set of long-term requirements to the Grid projects.These requirements are presented and discussed.
文摘One of the key components of any grid architecture is managing compute and storage resources and optimizing their utilization.SAM has implemented features that allow it to exercise a "fair share" and "prioritized" policy among many groups of users.The goals are as follows:1)implement th experiments policies for resource usage by research group and by data access mode,and 2) optimize the resource usage to maximize the overall throughput defined in terms of real data processing activity,At the lowest level of SAM architecture,called the station,the SAM system integrates the data delivery and cache management with the job control and scheduling of the batch system.At the site-level,for example at Fermilab,requests for data from on-site stations are managed to optimize Mass Storage System resources and network throughput,Management of resources at a various geographic levels are discussed.
文摘The Terabyte Analysis Machine Project is Developing hardware and software to analyze Terabyte scale datasets.The Distance Machine framework provides facilities to flexibly interface application specific indexing and partitioning algorthms to large scientific databases.
文摘SAM is a network-distributed data management system developed at Fermilab for use with Run II data,It is being Employed by the D0 Experiment to store,manage,deliver,and track processing of all data.We describe the design and features of the system including resource management and data transfer mechanisms,We show the operational experience D0 has accumulated to date including data acquisition processing,and all levels of access and delivery.We present various configurations of the system and describe their use in the collaboration.
文摘In this paper,we discuss the CDF Run Ⅱ Run Control and online event monitoring system.Run Control is the top level application that controls the data acquisition activities across 150 front end VME crates and related service processes,Run Control is a real-time multi-threaded application implemented in Java with flexible state machines,using JDBC database connections to configure clients,and including a user friendly and powerful graphical user interface.The CDF online event monitoring system consists of several parts;the eent monitoring programs,the display to browse their results,the server program which communicates with the display via socket connections ,the error receiver which displays error messages and communicates with run Control,and the state manager which monitors the state of the monitor programs.
文摘In this paper we highlight strategies and choices that make the Dφ Data Handling system markedly different from many other experiments' systems,We emphasize how far the Dφ system has come in innovating and implementing a Dφ-specific Data Grid system.We discuss experiences during the first months of detector commissioning and give some future plans for the system.
文摘The simulation program developed by the "Models of Networked Analysis at Regional Centers"(MONARC) project is a powerful and flexible tool for simulating the behavior of large scale distributed computing systems,In this study,we further validate this simulation tool in a large-scale distributed farm computing system.We also report the usage of this simulation tool to identify the bottlenecks and limitations of our farm system.
文摘The Monte Carlo particle numbering scheme presented here is intended to facilitate interfacing between event generators, detector simulators, and analysis packages used in particle physics. The numbering scheme was introduced in 1988 [1] and a revised version [2,3] was adopted in 1998 in order to allow systematic inclusion of quark model states which are as yet undiscovered and hypothetical particles such as SUSY particles. The numbering scheme is used in several event generators, e.g. HERWIG, PYTHIA, and SHERPA, and interfaces, e.g. /HEPEVT/and HepMC.
基金Supported by Fermi Research Alliance,LLC(DE-AC02-07CH11359)the U.S.Department of Energy,DOE(DE-SC0013642)+1 种基金IHEP(Y6515580U1)IHEP Innovation(Y4545171Y2)
文摘The discovery of unexpected properties of the Higgs boson would offer an intriguing opportunity to shed light on some of the most profound puzzles in particle physics. Beyond Standard Model（BSM） decays of the Higgs boson could reveal new physics in a direct manner. Future electron-positron lepton colliders operating as Higgs factories, including CEPC, FCC-ee and ILC, with the advantages of a clean collider environment and large statistics,could greatly enhance sensitivity in searching for these BSM decays. In this work, we perform a general study of Higgs exotic decays at future e^＋e^lepton colliders, focusing on the Higgs decays with hadronic final states and/or missing energy, which are very challenging for the High-Luminosity program of the Large Hadron Collider（HL-LHC）.We show that with simple selection cuts,O（10^-3-10^-5） limits on the Higgs exotic decay branching fractions can be achieved using the leptonic decaying spectator Z boson in the associated production mode e^＋e^-→ZH. We further discuss the interplay between detector performance and Higgs exotic decays, and other possibilities of exotic decays.Our work is a first step in a comprehensive study of Higgs exotic decays at future lepton colliders, which is a key area of Higgs physics that deserves further investigation.
文摘Very recently, the Belle and BESIII experiments observed a new charmonium-like state X（3823）, which is a good candidate for tile D-wave charmonium （13D2）. Because the X（3823） is just near the DD＊ threshold, the decay X（3823）→J/ψπ＋π- can be a golden channel to test the significance of coupled-channel effects. In this work, this decay is considered including both the hidden-charm dipion and the usual quantum chromodynamics multipole expansion （QCDME） contributions. The partial decay width, the dipion invari^nt mass spectrum distribution dF[X（3823） →J/ψπ＋π- /dmπ＋π-, and the corresponding dF[X（3823） →J/ψπ＋π-/d cosθ distribution are computed. Many param- eters are determined from exi：sting experimental data, so the results depend mainly only on one unknown phase between the QCDME and hidden-charm dipion amplitudes.
文摘Neutrino cross sections are an essential ingredient in all neutrino experiments. Interest in neutrino scattering has recently increased due to the need for such information in the interpretation of neutrino oscillation data. Historically, neutrino scattering results on both charged current （CC） and neutral current （NC） channels have been collected over many decades using a variety of targets, analysis techniques, and detector technologies. With the advent of intense neutrino sources constructed for neutrino oscillation investigations, experiments are now remeasuring these cross sections with a renewed appreciation for nuclear effects^T and the importance of improved neutrino flux estimations. This work summarizes accelerator-based neutrino cross section measurements performed in the ~ 0.1 -300 GeV range with an emphasis on inclusive, quasi-elastic, and pion production processes, areas where we have the most experimental input at present （Table 50.1 and Table 50.2）. For a more comprehensive discussion of neutrino cross sections, including neutrino-electron elastic scattering and lower energy neutrino measurements, the reoxter is directed to a recent review of this subject [1]. Here, we survey existing experimental data on neutrino interactions and do not attempt to provide a census of the associated theoretical calculations, which are both important and plentiful.
文摘The W＇ boson is a massive hypothetical particle of spin 1 and electric charge ±1, which is a color singlet and is predicted in various extensions of the Standard Model （SM）.
文摘The Z＇ boson is a massive, electrically-neutral and colorsinglet hypothetical particle of spin 1. This particle is predicted in many extensions of the Standard Model （SM） and has been the object of extensive phenomenological studies [1].
基金Supported by U.S.Department of Energythe Institute of Modern Physics and Chinese Academy of Sciences under contract Y104160YQ0 and agreement No.2015-BH-02+16 种基金the U.S.Department of Energy,for grant DE-AC05-06OR23177,under which Jefferson Science Associates,LLC,manages and operates Jefferson Laboratory and DE-SC0006765,Early Career awardFermilab,operated by the Fermi Research Alliance under contract number DEAC02-07CH11359 with the U.S.Department of EnergyBMBF,under contract No.06GI7121,and the DAAD under contract No.56889822 and by the Helmholtz International Center for FAIR within the LOEWE program of the State of Hessethe German Research Foundation DFG under contract number Collaborative Research Centre CRC-1044the Conselho Nacional de Desenvolvimento Científico e Tecnolgico-CNPq,Grant No.305894/2009-9Fundao de Amparoà Pesquisa do Estado de So Paulo-FAPESP,Grant No.2013/01907-0U.S.National Science Foundation,under grants PHY-1068286 and PHY-1403891the Brazilian National Council for Scientific and Technological Development under grant CNPq/CAPES-208188/2014-2U.S.Department of Energy under grant DE-FG02-05ER41374U.S.National Science Foundation under grant PHY-1306805U.S.Department of Energy,supported by Jefferson Science Associates,LLC under contract No.DE-AC05-06OR23177the National Natural Science Foundation of China(NSFC)under contract No.11575017the Ministry of Science and Technology of China under Contract No.2015CB856701U.S.Department of Energy,under grant DE-FG02-05ER41374U.S.National Science Foundation under grant PHY-1507572U.S.Department of Energy,under contract DE-AC05-06OR23177 and grant DE-FG0287ER40365the National Natural Science Foundation of China(NSFC)under contract numbers 11235011 and 11475187
文摘The last few years have been witness to a proliferation of new results concerning heavy exotic hadrons.Experimentally, many new signals have been discovered that could be pointing towards the existence of tetraquarks,pentaquarks, and other exotic configurations of quarks and gluons. Theoretically, advances in lattice field theory techniques place us at the cusp of understanding complex coupled-channel phenomena, modelling grows more sophisticated, and effective field theories are being applied to an ever greater range of situations. It is thus an opportune time to evaluate the status of the field. In the following, a series of high priority experimental and theoretical issues concerning heavy exotic hadrons is presented.
