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Observation of top-quark pair production in association with a photon and measurement of the tt¯γ production cross section in pp collisions at s=7 TeV using the ATLAS detector

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Physical Review D 2015年第7期91卷 072007-072007页

作者： G. Aad B. Abbott J. Abdallah S. Abdel Khalek O. Abdinov R. Aben B. Abi M. Abolins O. S. AbouZeid H. Abramowicz H. Abreu R. Abreu Y. Abulaiti B. S. Acharya L. Adamczyk D. L. Adams J. Adelman S. Adomeit T. Adye T. Agatonovic-Jovin J. A. Aguilar-Saavedra M. Agustoni S. P. Ahlen F. Ahmadov G. Aielli H. Akerstedt T. P. A. Åkesson G. Akimoto A. V. Akimov G. L. Alberghi J. Albert S. Albrand M. J. Alconada Verzini M. Aleksa I. N. Aleksandrov C. Alexa G. Alexander G. Alexandre T. Alexopoulos M. Alhroob G. Alimonti L. Alio J. Alison B. M. M. Allbrooke L. J. Allison P. P. Allport J. Almond A. Aloisio A. Alonso F. Alonso C. Alpigiani A. Altheimer B. Alvarez Gonzalez M. G. Alviggi K. Amako Y. Amaral Coutinho C. Amelung D. Amidei S. P. Amor Dos Santos A. Amorim S. Amoroso N. Amram G. Amundsen C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders G. Anders K. J. Anderson A. Andreazza V. Andrei X. S. Anduaga S. Angelidakis I. Angelozzi P. Anger A. Angerami F. Anghinolfi A. V. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli M. Aoki L. Aperio Bella R. Apolle G. Arabidze I. Aracena Y. Arai J. P. Araque A. T. H. Arce J-F. Arguin S. Argyropoulos M. Arik A. J. Armbruster O. Arnaez V. Arnal H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Asai N. Asbah A. Ashkenazi B. Åsman L. Asquith K. Assamagan R. Astalos M. Atkinson N. B. Atlay B. Auerbach K. Augsten M. Aurousseau G. Avolio G. Azuelos Y. Azuma M. A. Baak A. E. Baas C. Bacci H. Bachacou K. Bachas M. Backes M. Backhaus J. Backus Mayes E. Badescu P. Bagiacchi P. Bagnaia Y. Bai T. Bain J. T. Baines O. K. Baker P. Balek F. Balli E. Banas Sw. Banerjee A. A. E. Bannoura V. Bansal H. S. Bansil L. Barak S. P. Baranov E. L. Barberio D. Barberis M. Barbero T. Barillari M. Barisonzi T. Barklow N. Barlow B. M. Barnett R. M. Barnett Z. Barnovska A. Baroncelli G. Barone A. J. Barr F. Barreiro J. Barreiro Guimarães da Costa R. Bartoldus A. E. Barton P. Bartos V. Bartsch A. Bassalat A. Basye R. L. Bates J. R. Batley M. Battaglia M. Battistin F. Baue CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Academia Sinica Taipei Taiwan LAL Université Paris-Sud and CNRS/IN2P3 Orsay France 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 ON Canada Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion: Israel Institute of Technology Haifa Israel CERN Geneva Switzerland Department of Physics Stockholm University Sweden The Oskar Klein Centre Stockholm Sweden INFN Gruppo Collegato di Udine Sezione di Trieste 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 Yale University New Haven Connecticut USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Institute of Physics University of Belgrade Belgrade Serbia Laboratorio de Instrumentacao e Fisica Experimental de Particulas - LIP Lisboa Portugal Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics University of Bern Bern Switzerland Department of Physics Boston University Boston Massachusetts USA Joint Institute for Nuclear Research JINR Dubna Dubna Russia INFN Sezione di Roma Tor Vergata Italy Dipartimento di Fisica Universit

A search is performed for top-quark pairs (tt¯) produced together with a photon (γ) with transverse energy greater than 20 GeV using a sample of tt¯ candidate events in final states with jets, missing transverse momentum, and one isolated electron or muon. The data set used corresponds to an integrated luminosity of 4.59 fb−1 of proton-proton collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. In total, 140 and 222 tt¯γ candidate events are observed in the electron and muon channels, to be compared to the expectation of 79±26 and 120±39 non-tt¯γ background events, respectively. The production of tt¯γ events is observed with a significance of 5.3 standard deviations away from the null hypothesis. The tt¯γ production cross section times the branching ratio (BR) of the single-lepton decay channel is measured in a fiducial kinematic region within the ATLAS acceptance. The measured value is σtt¯γfid×BR=63±8(stat)−13+17(syst)±1(lumi) fb per lepton flavor, in good agreement with the leading-order theoretical calculation normalized to the next-to-leading-order theoretical prediction of 48±10 fb.

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Image based automated phenological stage detection of cereal plants

Image based automated phenological stage detection of cereal...

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International Conference on Agro-Geoinformatics

作者： Serdar Bağış B. Berk Üstündağ Faculty of Computer Engineering and Informatics Istanbul Technical University Istanbul Turkey

Most of the agricultural loss and yield evaluation methods require separate plant parameters depending on phenological stages. In this study, an automated image processing based phenological stages detection system for cereal plants is explained. TARIT Project (***) in Turkey aims to predict crop yield and loss rates in crop lands over a vast region in South-Eastern Turkey. The image data is acquired in RGB format at 30 minutes period while the accompanied meteorological data is sampled at 10 minutes period. We construct a state machine for each field, and states represent the phonological stages. Each state has different transition function for the next stage related logical state. 7 major stages for wheat and barley are considered to determine transition dates although it could be increased in general. The sampled image is enhanced and normalized by using light rate and surface wetness related sensor data. Four different processes are then applied and their outcomes are used to determine the state transition conditions. The first is vegetation area green pixel ratio after RGB to HIS color space conversion. The second is change detection with respect to a virtual reference or recognized pattern for growth rate measurement. The fourth is probabilistic supporting stage transition factors based on agro-meteorological parameters. We set state transition functions depending on combination of these parameters with state dependent thresholds. It has shown that phenological stage transition dates of cereal plants can automatically be assigned less than a week tolerance with respect to expert diagnosis, by using the proposed image based state transition model.

关键词： Agriculture Temperature measurement Cameras Vegetation mapping Image color analysis Remote sensing Monitoring

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Multi-sensor multi-target tracking for infrastructure protection

Multi-sensor multi-target tracking for infrastructure protec...

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2012 European Intelligence and Security informatics Conference, EISIC 2012

作者： Moreno, M.V. Pinana-Diaz, C. Toledo-Moreno, R. Zamora, M.A. Skarmeta, A. Dept. of Information and Communications Engineering Computer Science Faculty University of Murcia 30071 Murcia Spain Dept. of Electronics and Computer Technology School of Telecommunication Engineering Technical University of Cartagena 30202 Cartagena Murcia Spain

ISBN: (纸本)9781467323581

This paper presents a solution to the problem of intruder detection applied to control the access to safety-critical infrastructures. The system under consideration exploits the measurements of a radar and some Unattended Ground Sensors (UGS) by means of a multi-sensor multi-target tracking algorithm. Several experiments in real environments validate our proposal showing good results. © 2012 IEEE.

关键词： Clutter (information theory)

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Matlab/GUI Based Basic Design Principles of PID Controller in AVR

Matlab/GUI Based Basic Design Principles of PID Controller i...

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International Conference on Power engineering, Energy and Electrical Drives

作者： M. Baha BAYRAM H. Ibrahim BüLBüL Celal CAN Ramazan BAYINDIR Department of Electrical-Electronic Technology. Battalgazi Vocational High School. 06320 Ankara Turkey Department of Computer Education. Faculty of Industrial Arts Education Gazi University 06830 Ankara Turkey Department of Technical Programs Vocational Collage of Haci Bektas Nevsehir University 50800 Nevsehir Turkey Electrical and Electronics Engineering Dept. Faculty of Technology Gazi University 06500 Ankara Turkey

ISBN: (纸本)9781467363914

AVR (Automatic Voltage Regulator) is a part of the synchronous generator and it is responsible for regulating the reactive power and voltage level under normal operating terms at different load levels. The modeled system composed of the amplifier, exciter, sensor and proportional-integral-derivative (PID) controller. In order to model the system state space method is used. Also, their specifications and behaviors are discussed briefly. Simulation of the AVR system is carried out on the interface developed by Matlab GUI and the results are presented. The generator terminal voltage step responses are estimated by studying the controller parameters. In this paper, a system using Ziegler-Nichols (ZN) method as a tuning method for determining the parameters of PID control for an AVR system is proposed. Also the transient stability of AVR system with PID parameters change is proposed.

关键词： Automatic voltage control(AVR) GUI synchronous generator Ziegler-Nichols method PID

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QoS-Aware User Cohabitation Coordinator in Cognitive Radio Networks

QoS-Aware User Cohabitation Coordinator in Cognitive Radio N...

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IEEE Global Communications Conference

作者： Berk Canberk Ian F. Akyildiz Sema Oktug Dept. of Computer Engineering Computer and Informatics Faculty Istanbul Technical University Broadband Wireless Networking Laboratory School of Electrical and Computer Engineering Georgia Institute of Technology

ISBN: (纸本)9781467309202

In Cognitive Radio (CR) Networks, the licensed but vacant spectrum bands are shared by the unlicensed users (CR users) in an opportunistic manner. The CR users should operate and cohabit in the licensed bands without causing any interference to the Primary Users (PUs). This CR user cohabitation which is managed by a spectrum Coordinator, enables several design challenges. Therefore, A User Cohabitation Coordinator, UCC, should be designed considering the heterogeneous Quality of Service (QoS) requirements for the CR users and the short-term fluctuations in the available licensed spectrum bands. Moreover, the spectrum coordination among the CR network operators for CR users should also be considered by the UCC for an effective and fair spectrum sharing. Considering these challenges, the main contribution of this paper is to design a QoS-based spectrum coordinator for CR user cohabitation in order to achieve high throughput and fairness. The proposed UCC uses the first-difference filter clustering and correlation based PU modeling to integrate the fluctuations of the PU activities into the spectrum sharing. The UCC characterizes the QoS requirements of CR users by adopting queuing theoretic models. The proposed scheme enables the cohabitation of the CR operators dynamically. The evaluations demonstrate that the proposed UCC provides high throughput while maintaining the fairness in the CR networks.

关键词： Cohabitation chromium ULTRA CLEAN COAL Cognitive radio Coordinator Spectra Consumers Radio networks

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Building up Lexical Sample Dataset for Turkish Word Sense Disambiguation

Building up Lexical Sample Dataset for Turkish Word Sense Di...

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IEEE International Symposium on Innovations in Intelligent Systems and Applications (INISTA)

作者： Bahar İlgen Eşref Adali A. Cüneyd Tantuğ Computer Engineering Department Istanbul Kültür University Istanbul Turkey Computer and Informatics Faculty Istanbul Technical University Istanbul Turkey

Word Sense Disambiguation (WSD) has become even more important research area in recent years with the widespread usage of Natural Language Processing (NLP) applications. WSD task has two variants: “Lexical Sample” and “All Words” approaches. Lexical Sample approach disambiguates the occurrences of a small sample of target words that were previously selected, while in the latter all the words in a piece of text are disambiguated. In the scope of this work, a Lexical Sample Dataset for Turkish has been prepared. As a first step, highly ambiguous words in Turkish have been selected. Collection of text samples for chosen words has been completed. Five taggers have annotated the word senses. This paper summarizes the step-by-step building-up process of a Lexical Sample Dataset in Turkish and presents the results of some experiments on it.

关键词： Dictionaries Accuracy Natural language processing Humans Buildings Educational institutions Reliability

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A Heuristic Algorithm for Euclidean Steiner Minimal Tree Inside Simple Polygon

A Heuristic Algorithm for Euclidean Steiner Minimal Tree Ins...

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2012 IEEE International Conference on computer Science and Automation engineering（CSAE 2012）

作者： Elham Pashaei Ali Nourollah Alireza Bagheri Faculty of Computer and Informatics Istanbul Technical University Department of Electrical Computer and IT EngineeringQazvin Islamic Azad University Department of Computer Engineering and Information Technology Amirkabir University

The Steiner problem leads to solutions in several scientific and business *** networks routing and electronic integrated circuits are few examples of *** some points in the Euclidean plane,we can construct a minimum spanning tree connecting these （terminal）*** is possible to add some extra points （Steiner Points）in order to decrease the length of this tree, which would in turn lead to Euclidean Steiner Minimal Tree （ESMT）.This problem is considered as a NP-hard problem,as it may contain some nodes that are not in the set of given *** a simple polygon with vertices and terminals in it,we try to find an Euclidean Steiner minimal tree connecting all these terminals *** this paper,we propose a new solution based on the straight skeleton of a simple polygon for finding Euclidean Steiner tree of any number of terminals,in a given simple polygon.

关键词： Euclidean Steiner Minimal Tree straight skeleton of simple polygon heuristic Algorithm

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A New Steiner Tree Algorithm Based on Sollin's Algorithm in Graphs

A New Steiner Tree Algorithm Based on Sollin's Algorithm in ...

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2012 IEEE International Conference on computer Science and Automation engineering（CSAE 2012）

作者： Elnaz Pashaei Ali Nourollah Mohammad Reza Meybodi Faculty of Computer & Informatics Istanbul Technical UniversityIstanbulturkey Department of Electrical Computer and IT EngineeringQazvin Islamic Azad UniversityQazvinIran Department of Computer & IT Engineering Amirkabir University of TechnologyTehranIran

The minimum Steiner tree problem,a classical combinatorial optimization problem with a long history,is a NP-complete *** to its wide application,study of heuristic algorithm about Steiner tree problem has important practical and theoretical *** this paper,we introduce a new heuristic algorithm based on Sollin's algorithm for solving the Steiner tree problem in *** describe our algorithm and its computational *** is shown that our algorithm has a good performance in achieving a Steiner tree and is comparable with other existing solutions.

关键词： Steiner Tree problem Heuristic Algorithm Sollin's algorithm

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Erratum: Search for new phenomena in final states with large jet multiplicities and missing transverse momentum at = 8 TeV proton-proton collisions using the ATLAS experiment

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Journal of High Energy Physics 2014年第1期2014卷 1-18页

作者： G. Aad T. Abajyan B. Abbott J. Abdallah S. Abdel Khalek O. Abdinov R. Aben B. Abi M. Abolins O. S. AbouZeid H. Abramowicz H. Abreu Y. Abulaiti B. S. Acharya L. Adamczyk D. L. Adams T. N. Addy J. Adelman S. Adomeit T. Adye S. Aefsky T. Agatonovic-Jovin J. A. Aguilar-Saavedra M. Agustoni S. P. Ahlen A. Ahmad M. Ahsan G. Aielli T. P. A. Åkesson G. Akimoto A. V. Akimov M. A. Alam J. Albert S. Albrand M. J. Alconada Verzini M. Aleksa I. N. Aleksandrov F. Alessandria C. Alexa G. Alexander G. Alexandre T. Alexopoulos M. Alhroob M. Aliev G. Alimonti L. Alio J. Alison B. M. M. Allbrooke L. J. Allison P. P. Allport S. E. Allwood-Spiers J. Almond A. Aloisio R. Alon A. Alonso F. Alonso A. Altheimer B. Alvarez Gonzalez M. G. Alviggi K. Amako Y. Amaral Coutinho C. Amelung V. V. Ammosov S. P. Amor Dos Santos A. Amorim S. Amoroso 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 S. Angelidakis P. Anger A. Angerami F. Anghinolfi A. V. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli M. Aoki L. Aperio Bella R. Apolle G. Arabidze I. Aracena Y. Arai A. T. H. Arce S. Arfaoui J.-F. Arguin S. Argyropoulos E. Arik M. Arik A. J. Armbruster O. Arnaez V. Arnal O. Arslan A. Artamonov G. Artoni D. Arutinov S. Asai N. Asbah S. Ask B. Åsman L. Asquith K. Assamagan R. Astalos A. Astbury M. Atkinson N. B. Atlay B. Auerbach E. Auge K. Augsten M. Aurousseau G. Avolio D. Axen G. Azuelos Y. Azuma M. A. Baak C. Bacci A. M. Bach H. Bachacou K. Bachas M. Backes M. Backhaus J. Backus Mayes E. Badescu P. Bagiacchi P. Bagnaia Y. Bai D. C. Bailey T. Bain J. T. Baines O. K. Baker S. Baker P. Balek F. Balli E. Banas Sw. Banerjee D. Banfi A. Bangert V. Bansal H. S. Bansil L. Barak S. P. Baranov 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 R. Bartoldus A. E. Barton V. Bartsch A. B 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 United States of America Institut de Física d’Altes Energies and Departament de Física de la Universitat Autònoma de Barcelona Barcelona Spain LAL Université Paris-Sud and CNRS/IN2P3 Orsay France 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 United States of America Department of Physics and Astronomy Michigan State University East Lansing United States of America Department of Physics University of Toronto Toronto 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 à l’Energie Atomique et aux Energies Alternatives) Gif-sur-Yvette France Department of Physics Stockholm University Stockholm Sweden INFN Gruppo Collegato di Udine Udine Italy Department of Physics King’s College London London United Kingdom AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Physics Department Brookhaven National Laboratory Upton United States of America Department of Physics Hampton University Hampton United States of America Department of Physics Yale University New Haven United States of America Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Department of Physics Brandeis University Waltham United States of America Vinca Institute of Nuclear Sciences University of Belgrade Belgrade Serbia Laboratorio de Instrumentacao e Fisica Experimental de Particulas - LIP Lisboa Portug

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Spatio-Temporal Estimation for Interference Management in Femtocell Networks

Spatio-Temporal Estimation for Interference Management in Fe...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： David M. Gutierrez-Estevez Berk Canberk Ian F. Akyildiz Broadband Wireless Network Laboratory School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta Georgia 30332 USA. Dept. of Computer Engineering Computer and Informatics Faculty Istanbul Technical University Ayazaga 34469 Istanbul-Turkey

ISBN: (纸本)9781467325660

Two-tier femtocell-based networks have been proposed as an economic solution to improve coverage and capacity in wireless cellular systems. Although widely studied in the literature, interference management in these networks remains as a technical challenge in need of effective solutions. In particular, the interference estimation is a relevant portion of the problem that enables correct operation of interference management schemes relying on this information. In this paper, a novel downlink cross-tier interference estimation approach is proposed based on spatio-temporal correlation techniques. An ordinary Kriging interpolator using Semivariogram Analysis is applied to the interfering signal followed by an autorregressive model. The signal estimation at the interfered users' location is exploited at the radio resource manager of the femtocell or macrocell base station by formulating a resource allocation problem that is solved by means of a heuristic algorithm. A practical procedure implementing this scheme in the network is also proposed. Numerical results show how performance of crosstier interference management approaches can be optimized by implementing this idea.

关键词： Spatio-Temporal correlation techniques Two-tier

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