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Search for squarks and gluinos with the ATLAS detector in final states with jets and missing transverse momentum using 4.7 fb−1 of s=7 TeV proton-proton collision data

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Physical Review D 2013年第1期87卷 012008-012008页

作者： G. Aad T. Abajyan B. Abbott J. Abdallah S. Abdel Khalek A. A. Abdelalim O. Abdinov R. Aben B. Abi M. Abolins O. S. AbouZeid H. Abramowicz H. Abreu E. Acerbi B. S. Acharya L. Adamczyk D. L. Adams T. N. Addy J. Adelman S. Adomeit P. Adragna T. Adye S. Aefsky J. A. Aguilar-Saavedra M. Agustoni M. Aharrouche S. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli T. Akdogan T. P. A. Åkesson G. Akimoto A. V. Akimov M. S. Alam M. A. Alam J. Albert S. Albrand M. Aleksa I. N. Aleksandrov F. Alessandria C. Alexa G. Alexander G. Alexandre T. Alexopoulos M. Alhroob M. Aliev G. Alimonti J. Alison B. M. M. Allbrooke P. P. Allport S. E. Allwood-Spiers J. Almond A. Aloisio R. Alon A. Alonso F. Alonso B. Alvarez Gonzalez M. G. Alviggi K. Amako C. Amelung V. V. Ammosov A. Amorim N. Amram C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders G. Anders K. J. Anderson A. Andreazza V. Andrei X. S. Anduaga P. Anger A. Angerami F. Anghinolfi A. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli M. Aoki S. Aoun L. Aperio Bella R. Apolle G. Arabidze I. Aracena Y. Arai A. T. H. Arce S. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armbruster O. Arnaez V. Arnal C. Arnault A. Artamonov G. Artoni D. Arutinov S. Asai R. Asfandiyarov S. Ask B. Åsman L. Asquith K. Assamagan A. Astbury M. Atkinson B. Aubert E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen G. Azuelos Y. Azuma M. A. Baak G. Baccaglioni C. Bacci A. M. Bach H. Bachacou K. Bachas M. Backes M. Backhaus E. Badescu P. Bagnaia S. Bahinipati Y. Bai D. C. Bailey T. Bain J. T. Baines O. K. Baker M. D. Baker S. Baker E. Banas P. Banerjee Sw. Banerjee D. Banfi A. Bangert V. Bansal H. S. Bansil L. Barak S. P. Baranov A. Barbaro Galtieri T. Barber E. L. Barberio D. Barberis M. Barbero D. Y. Bardin T. Barillari M. Barisonzi T. Barklow N. Barlow B. M. Barnett R. M. Barnett A. Baroncelli G. Barone A. J. Barr F. Barreiro J. Barreiro Guimarães da Costa P. Barrillon R. Bartoldus A. E. Barton V. Bartsch A. Basye R. L. Bates L. Batkova J. R. Batley A. Battagli Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg Germany Physikalisches Institut University of Bonn Bonn Germany Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institut de Física d’Altes Energies and Departament de Física de la Universitat Autònoma de Barcelona and ICREA Barcelona Spain LAL Université Paris-Sud and CNRS/IN2P3 Orsay France Section de Physique Université de Genève Geneva Switzerland Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam Netherlands Department of Physics Oklahoma State University Stillwater Oklahoma USA Department of Physics and Astronomy Michigan State University East Lansing Michigan USA Department of Physics University of Toronto Toronto Ontario Canada Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel DSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l’Univers) CEA Saclay (Commissariat a l’Energie Atomique) Gif-sur-Yvette France INFN Sezione di Milano Italy Dipartimento di Fisica Università di Milano Milano Italy INFN Gruppo Collegato di Udine Italy ICTP Trieste Italy AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Physics Department Brookhaven National Laboratory Upton New York USA Department of Physics Hampton University Hampton Virginia USA Department of Physics Yale University New Haven Connecticut USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany School of Physics and Astronomy Queen Mary University of London London United Kingdom Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Department of Physics Brandeis University Waltham Massachusetts USA Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Albert Einstein Center for

A search for squarks and gluinos in final states containing jets, missing transverse momentum and no high-pT electrons or muons is presented. The data represent the complete sample recorded in 2011 by the ATLAS experiment in 7 TeV proton-proton collisions at the Large Hadron Collider, with a total integrated luminosity of 4.7 fb−1. No excess above the Standard Model background expectation is observed. Gluino masses below 860 GeV and squark masses below 1320 GeV are excluded at the 95% confidence level in simplified models containing only squarks of the first two generations, a gluino octet and a massless neutralino, for squark or gluino masses below 2 TeV, respectively. Squarks and gluinos with equal masses below 1410 GeV are excluded. In minimal supergravity/constrained minimal supersymmetric Standard Model models with tan β=10, A0=0 and μ>0, squarks and gluinos of equal mass are excluded for masses below 1360 GeV. Constraints are also placed on the parameter space of supersymmetric models with compressed spectra. These limits considerably extend the region of supersymmetric parameter space excluded by previous measurements with the ATLAS detector.

关键词： PROTON-proton interactions QUARKS ATOMIC mass ANGULAR momentum (Nuclear physics) JETS (Nuclear physics) STANDARD model (Nuclear physics) LUMINOSITY distance SUPERGRAVITY SUPERSYMMETRY (Physics) NUCLEAR counters

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Measurement of the Λb0 lifetime and mass in the ATLAS experiment

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Physical Review D 2013年第3期87卷 032002-032002页

作者： G. Aad T. Abajyan B. Abbott J. Abdallah S. Abdel Khalek A. A. Abdelalim O. Abdinov R. Aben B. Abi M. Abolins O. S. AbouZeid H. Abramowicz H. Abreu E. Acerbi B. S. Acharya L. Adamczyk D. L. Adams T. N. Addy J. Adelman S. Adomeit P. Adragna T. Adye S. Aefsky J. A. Aguilar-Saavedra M. Agustoni M. Aharrouche S. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli T. Akdogan T. P. A. Åkesson G. Akimoto A. V. Akimov M. S. Alam M. A. Alam J. Albert S. Albrand M. Aleksa I. N. Aleksandrov F. Alessandria C. Alexa G. Alexander G. Alexandre T. Alexopoulos M. Alhroob M. Aliev G. Alimonti J. Alison B. M. M. Allbrooke P. P. Allport S. E. Allwood-Spiers J. Almond A. Aloisio R. Alon A. Alonso F. Alonso B. Alvarez Gonzalez M. G. Alviggi K. Amako C. Amelung V. V. Ammosov A. Amorim N. Amram C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders G. Anders K. J. Anderson A. Andreazza V. Andrei X. S. Anduaga P. Anger A. Angerami F. Anghinolfi A. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli M. Aoki S. Aoun L. Aperio Bella R. Apolle G. Arabidze I. Aracena Y. Arai A. T. H. Arce S. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armbruster O. Arnaez V. Arnal C. Arnault A. Artamonov G. Artoni D. Arutinov S. Asai R. Asfandiyarov S. Ask B. Åsman L. Asquith K. Assamagan A. Astbury B. Aubert E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen G. Azuelos Y. Azuma M. A. Baak G. Baccaglioni C. Bacci A. M. Bach H. Bachacou K. Bachas M. Backes M. Backhaus E. Badescu P. Bagnaia S. Bahinipati Y. Bai D. C. Bailey T. Bain J. T. Baines O. K. Baker M. D. Baker S. Baker E. Banas P. Banerjee Sw. Banerjee D. Banfi A. Bangert V. Bansal H. S. Bansil L. Barak S. P. Baranov A. Barbaro Galtieri T. Barber E. L. Barberio D. Barberis M. Barbero D. Y. Bardin T. Barillari M. Barisonzi T. Barklow N. Barlow B. M. Barnett R. M. Barnett A. Baroncelli G. Barone A. J. Barr F. Barreiro J. Barreiro Guimarães da Costa P. Barrillon R. Bartoldus A. E. Barton V. Bartsch R. L. Bates L. Batkova J. R. Batley A. Battaglia M. Battistin F. Bau Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg Germany Physikalisches Institut University of Bonn Bonn Germany Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institut de Física d’Altes Energies and Departament de Física de la Universitat Autònoma de Barcelona and ICREA Barcelona Spain LAL Université Paris-Sud and CNRS/IN2P3 Orsay France Section de Physique Université de Genève Geneva Switzerland Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam Netherlands Department of Physics Oklahoma State University Stillwater Oklahoma USA Department of Physics and Astronomy Michigan State University East Lansing Michigan USA Department of Physics University of Toronto Toronto Ontario Canada Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel DSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l’Univers) CEA Saclay (Commissariat a l’Energie Atomique) Gif-sur-Yvette France INFN Sezione di Milano Italy Dipartimento di Fisica Università di Milano Milano Italy INFN Gruppo Collegato di Udine Italy ICTP Trieste Italy AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Physics Department Brookhaven National Laboratory Upton New York USA Department of Physics Hampton University Hampton Virginia USA Department of Physics Yale University New Haven Connecticut USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany School of Physics and Astronomy Queen Mary University of London London United Kingdom Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Department of Physics Brandeis University Waltham Massachusetts USA Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Albert Einstein Center for

A measurement of the Λb0 lifetime and mass in the decay channel Λb0→J/ψ(μ+μ−)Λ0(pπ−) is presented. The analysis uses a signal sample of about 2200 Λb0 and Λ¯b0 decays that are reconstructed in 4.9 fb−1 of ATLAS pp collision data collected in 2011 at the LHC center-of-mass energy of 7 TeV. A simultaneous mass and decay time maximum likelihood fit is used to extract the Λb0 lifetime and mass. They are measured to be τΛb=1.449±0.036(stat)±0.017(syst) ps and mΛb=5619.7±0.7(stat)±1.1(syst) MeV.

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Correcting routing information through GPS data processing

Correcting routing information through GPS data processing

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International IEEE Conference on Intelligent Transportation Systems

作者： Freitas, Tiago R. M. Coelho, António Rossetti, Rosaldo J. F. Department of Informatics Engineering Faculty of Engineering University of Porto 4200-465 Porto Portugal INESC Porto 4200-465 Porto Portugal Artificial Intelligence and Computer Science Lab. LIACC NIAD and R Rua Dr. Roberto Frias s/n 4200-465 Porto Portugal

ISBN: (纸本)9781424476572

Devices that offer positioning and route guidance depend on updated digital maps for correct functioning. Updating digital maps is a highly expensive and complex process so it became necessary to develop new ways to detect changes to the road network. Using GPS points gathered by users during their journeys, it is possible to compare the real road network with the digital map. This paper describes a methodology to detect incongruences of different road geometry, alteration of junction position, prohibited manoeuvres and traffic direction as well as a sample of the results obtained. ©2010 IEEE.

关键词： Global positioning system

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Measurement of charged-particle event shape variables in inclusive (s)=7 TeV proton-proton interactions with the ATLAS detector

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Physical Review D 2013年第3期88卷 032004-032004页

The measurement of charged-particle event shape variables is presented in inclusive inelastic pp collisions at a center-of-mass energy of 7 TeV using the ATLAS detector at the LHC. The observables studied are the transverse thrust, thrust minor, and transverse sphericity, each defined using the final-state charged particles’ momentum components perpendicular to the beam direction. Events with at least six charged particles are selected by a minimum-bias trigger. In addition to the differential distributions, the evolution of each event shape variable as a function of the leading charged-particle transverse momentum, charged-particle multiplicity, and summed transverse momentum is presented. Predictions from several Monte Carlo models show significant deviations from data.

关键词： CHARGED particle accelerators VARIABLES (Mathematics) PROTON-proton interactions CENTER of mass ATLAS (computer program language) MOMENTUM distributions

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Numerical simulations of surface plasmon gap waveguides for nanometric optical circuits

Numerical simulations of surface plasmon gap waveguides for ...

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International Conference on Communications and Electronics, ICCE

作者： Kazuo Tanaka Trong Minh Tran Masahiro Tanaka Kiyofumi Katayama Department of Computer Engineering Gifu University Gifu City Japan Department of Computer Engineering Gifu University Japan Faculty of Administration and Informatics University of Hamamatsu Hamamatsu City Japan

Numerical simulations for understanding fundamental characteristics of the surface plasmon polariton gap waveguide (SPGW) has been demonstrated. The SPGW excited through an aperture have been demonstrated by the three-dimensional simulations using a volume integral equation method. Complex propagation constants calculated by the Method of Lines (MoL) has been shown. Applications of SPGWs to the nanosize E-plane planar optical circuits are also demonstrated.

关键词： Integrated circuit modeling

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An Efficient Resource Allocation Algorithm for OFDMA Cooperative Relay Networks with Fairness and Qos Guaranteed

An Efficient Resource Allocation Algorithm for OFDMA Coopera...

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International Conference on Network Applications Protocols and Services (NETAPPS)

作者： Asem A. Salah Borhanuddin Mohd. Ali Ahmad Saqer Nidhal Odeh Department of Computer and Communication Systems Engineering Faculty of Engineering Universiti Putra Malaysia Serdang Malaysia ICT Research Institute Faculty of Informatics University of Wollongong Wollongong NSW Australia

This paper proposes a new resource allocation algorithm for uplink OFDMA-based cooperative relay networks assuming multiple source nodes, multiple relay nodes and a single destination. The aim is to maximize the total sum of the sources data rates while guaranteeing fairness among them with different QoS requirements. Assuming perfect channel state information (CSI) at the resource allocation controller. The optimization problem is formulated such that each source is assigned a weight factor based on its QoS requirements, then the ones with high weights are given more priority to select their resources (relay stations and subcarriers) first. Once the required QoS is achieved for all sources, the weight factor for all sources will be unity. The remaining resources are allocated to the sources with maximum instantaneous rate. The results show that the proposed algorithm outperforms the greedy and static algorithms in terms of outage probability and fairness.

关键词： Resource management Relays Quality of service Optimization Greedy algorithms OFDM Vehicular and wireless technologies

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A nuclear norm minimization approach to fractionally spaced blind channel equalization

A nuclear norm minimization approach to fractionally spaced ...

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Katsumi Konishi Toshihiro Furukawa Department of Computer Science Faculty of Informatics Kogakuin University Tokyo Japan Department of Management Science Faculty of Engineering Tokyo University of Science Tokyo Japan

This paper proposes an algorithm for the blind fractionally spaced equalization (FSE). We show that the rank minimization approach leads to reduce degrees of freedom in the blind FSE problem and improves the quality of equalization. By introducing the nuclear norm heuristic, the design problem of blind channel equalization is formulated as the nuclear norm minimization problem. We also show that the affection of noise is reduced by minimizing the nuclear norm. Numerical examples demonstrate the effectiveness of the proposed algorithm.

关键词： Blind equalizers Minimization methods Quadrature amplitude modulation computer science informatics engineering management Noise reduction Time invariant systems Parameter estimation Noise robustness

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Get involved! The IOI workshop 2010, its goals and results 22

Get involved! The IOI workshop 2010, its goals and results

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International Conference Joint with the 22nd International Olympiad in informatics, IOI 2010

作者： Pohl, Wolfgang Burton, Benjamin A. Dagiene, Valentina Fakcharoenphol, Jittat Forišek, Michal Hiron, Mathias Opmanis, Martiņš Skupas, Bronius Van Der Vegt, Willem Bundeswettbewerb Informatik Ahrstr. 45 Bonn53175 Germany School of Mathematics and Physics University of Queensland BrisbaneQLD4072 Australia Informatics Methodology Department Institute of Mathematics and Informatics Akademijos 4 VilniusLT-08663 Lithuania Department of Computer Engineering Kasetsart University Bangkok Thailand Department of Informatics Faculty of Mathematics Physics and Informatics Comenius University Mlynská Dolina Bratislava842 48 Slovakia France IOI France Institute of Mathematics and Computer Science University of Latvia Riga Latvia Windesheim University for Applied Sciences School of Education PO Box 10090 Zwolle8000 GB Netherlands

In May 2010, the third IOI workshop took place in Schloss Dagstuhl, Germany. It was motivated by the discussions held at and after the panel session of 2009's IOI conference in Plovdiv. There, discussions focussed on communication and collaboration among the IOI community, as well as communication of the IOI competition to outsiders. At the workshop, members of the IOI community met to develop a first version of an IOI Wiki as a tool for communication and collaboration, and devised suggestions on how to visualize IOI-style contests to make them more accessible to the outside world. © 2010 Institute of Mathematics and informatics.

关键词： IOI Programming contests Visualization Wiki-based collaboration

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Preferences of handwriting recognition on mobile information systems in medicine: Improving handwriting algorithm on the basis of real-life usability research

Preferences of handwriting recognition on mobile information...

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作者： Holzinger, Andreas Schlögl, Martin Peischl, Bernhard Debevc, Matjaz Institute of Medical Informatics Statistics and Documentation Research Unit HCI4MED Medical University Graz Graz Austria Institute of Software Technology Graz University of Technology Graz Austria Faculty of Electrical Engineering and Computer Science University of Maribor Maribor Slovenia

ISBN: (纸本)9789898425171

Streamlining data acquisition in mobile health care in order to increase accuracy and efficiency can only benefit the patient. The company FERK-Systems has been providing health care information systems for various German medical services for many years. The design and development of a compatible front-end system for handwriting recognition, particularly for use in ambulances was clearly needed. While handwriting recognition has been a classical topic of computer science for many years, many problems still need to be solved. In this paper, we report on the study and resulting improvements achieved by the adaptation of an existing handwriting algorithm, based on experiences made during medical rescue missions. By improving accuracy and error correction the performance of an available handwriting recognition algorithm was increased. However, the end user studies showed that the virtual keyboard is still the overall preferred method compared to handwriting, especially among participants with a computer usage of more than 30 hours a week. This is possibly due to the wide availability of the QUERTY/QUERTZ keyboard.

关键词： Human computer interaction

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Novel Results in Detection,Analysis and Classification of Information in Visual Data

Novel Results in Detection,Analysis and Classification of In...

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The Ninth International Conference on Information and Management Sciences

作者： Andrzej Sluzek Mariusz Paradowski Yang Duanduan Md Saiful Islam Elahe Farahzadeh Nanyang Technological University School of Computer Engineering Singapore Nicolaus Copernicus University Faculty of PhysicsAstronomy & InformaticsTorun Singapore Wroclaw University of Technology Institute of Applied InformaticsWroclaw Nanyang Technological University School of Computer EngineeringSingapore

The paper overviews a range of novel techniques recently developed for efficient detection and further analysis of data in visual databases.A particular attention is paid to the issue that,until recently,has been considered too complex and ill-defined,*** of unspecified similar fragments in images of unpredictable and unknown *** discuss the following techniques that can be instrumental in solving this problem:(1) detection of image fragments related by affine transformations;(2) detection of image fragments related topological mappings;(3) accurate shape estimate of detected similar image fragments and(4) automatic classification of fragments into classes of objects of similar visual *** paper presents the theoretical background and the implementation results. Additionally,a demo of a real-time system for detection of fragments similar to database images in a video stream will be presented during the conference.

关键词： visual data retrieval fragment matching affine transforms topology co-segmentation automatic classification

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