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Search for nonpointing and delayed photons in the diphoton and missing transverse momentum final state in 8 TeV pp collisions at the LHC using the ATLAS detector

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Physical Review D 2014年第11期90卷 112005-112005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 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 F. A. Arduh 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 b. Axen 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 S. L. barnes 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 S. J. batista J. R. bat 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 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 Università di Rom

A search has been performed, using the full 20.3 fb−1 data sample of 8 TeV proton-proton collisions collected in 2012 with the ATLAS detector at the LHC, for photons originating from a displaced vertex due to the decay of a neutral long-lived particle into a photon and an invisible particle. The analysis investigates the diphoton plus missing transverse momentum final state, and is therefore most sensitive to pair production of long-lived particles. The analysis technique exploits the capabilities of the ATLAS electromagnetic calorimeter to make precise measurements of the flight direction, as well as the time of flight, of photons. No excess is observed over the Standard Model predictions for background. Exclusion limits are set within the context of gauge mediated supersymmetry breaking models, with the lightest neutralino being the next-to-lightest supersymmetric particle and decaying into a photon and gravitino with a lifetime in the range from 250 ps to about 100 ns.

关键词： SUPERSYMMETRY (Physics) PHOTON scattering PROTON-proton interactions LARGE Hadron Collider (France & Switzerland) STANDARD model (Nuclear physics) QUANTUM numbers GRAVITINO

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Search for dark matter in events with a Z boson and missing transverse momentum in pp collisions at s=8 TeV with the ATLAS detector

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Physical Review D 2014年第1期90卷 012004-012004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 T. Agatonovic-Jovin J. A. Aguilar-Saavedra M. Agustoni S. P. Ahlen A. Ahmad F. Ahmadov G. Aielli T. P. A. Åkesson G. Akimoto A. V. Akimov 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 S. E. Allwood-Spiers J. Almond A. Aloisio R. Alon A. Alonso F. Alonso C. Alpigiani 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 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 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 O. Arslan A. Artamonov G. Artoni S. Asai N. Asbah A. Ashkenazi S. Ask b. Åsman L. Asquith K. Assamagan R. Astalos M. Atkinson N. b. Atlay b. Auerbach E. Auge K. Augsten M. Aurousseau G. Avolio 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 A. A. E. bannoura V. bansal H. S. bansil L. barak S. P. baranov T. barber 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. basy CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Physikalisches Institut University of Bonn Bonn Germany Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma United States of America 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 United States of America Department of Physics and Astronomy Michigan State University East Lansing Michigan United States of America 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 à l’Energie Atomique et aux Energies Alternatives) Gif-sur-Yvette France Department of Physics Stockholm University Sweden The Oskar Klein Centre Stockholm Sweden INFN Gruppo Collegato di Udine Sezione di Trieste 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 United States of America Department of Physics Hampton University Hampton Virginia United States of America Department of Physics Yale University New Haven Connecticut United States of America Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Vinca Institute of Nuclear Sciences University of Belgrade Belgrade Serbia Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Laboratorio de Instrumentacao e Fisica Experimental de Particulas–LIP Lisboa Portugal

A search is presented for production of dark-matter particles recoiling against a leptonically decaying Z boson in 20.3 fb−1 of pp collisions at s=8 TeV with the ATLAS detector at the Large Hadron Collider. Events with large missing transverse momentum and two oppositely charged electrons or muons consistent with the decay of a Z boson are analyzed. No excess above the Standard Model prediction is observed. Limits are set on the mass scale of the contact interaction as a function of the dark-matter particle mass using an effective field theory description of the interaction of dark matter with quarks or with Z bosons. Limits are also set on the coupling and mediator mass of a model in which the interaction is mediated by a scalar particle.

关键词： DARK matter (Astronomy) Z bosons COLLISIONS (Nuclear physics) LEPTON decays LARGE Hadron Collider (France & Switzerland) STANDARD model (Nuclear physics)

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Measurement of event-plane correlations in sNN=2.76 TeV lead-lead collisions with the ATLAS detector

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Physical Review C 2014年第2期90卷 024905-024905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 A. Ahmad F. Ahmadov G. Aielli T. P. A. Åkesson G. Akimoto A. V. Akimov 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 S. E. Allwood-Spiers 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 O. Arslan A. Artamonov G. Artoni S. Asai N. Asbah A. Ashkenazi S. Ask 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 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 S. baker P. balek F. balli E. banas Sw. banerjee D. banfi A. bangert 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 L. batkova J. R. batley M. bat CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman OK United States of America 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 OK United States of America Department of Physics and Astronomy Michigan State University East Lansing MI United States of America Department of Physics University of Toronto Toronto ON 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 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 NY United States of America Department of Physics Yale University New Haven CT United States of America Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Vinca Institute of Nuclear Sciences University of Belgrade Belgrade Serbia Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada (Spain) Portugal Laboratorio de Instrumentacao e Fisica Experimental de Particulas - LIP Lisboa Portugal Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics University of Bern Bern Switzerland Department of Phy

A measurement of event-plane correlations involving two or three event planes of different order is presented as a function of centrality for 7 μb−1 Pb+Pb collision data at sNN=2.76 TeV, recorded by the ATLAS experiment at the Large Hadron Collider. Fourteen correlators are measured using a standard event-plane method and a scalar-product method, and the latter method is found to give a systematically larger correlation signal. Several different trends in the centrality dependence of these correlators are observed. These trends are not reproduced by predictions based on the Glauber model, which includes only the correlations from the collision geometry in the initial state. Calculations that include the final-state collective dynamics are able to describe qualitatively, and in some cases also quantitatively, the centrality dependence of the measured correlators. These observations suggest that both the fluctuations in the initial geometry and the nonlinear mixing between different harmonics in the final state are important for creating these correlations in momentum space.

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Erratum to: Search for supersymmetry in events containing a same-flavour opposite-sign dilepton pair, jets, and large missing transverse momentum in ... TeV pp collisions with the ATLAS detector

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The European Physical Journal. C, Particles and Fields. 2015年第10期75卷 1页

作者： Aad, G Abbott, b Abdallah, J Abdinov, O Aben, R Abolins, M Abouzeid, O S Abramowicz, H Abreu, H Abreu, R Abulaiti, Y Acharya, b S Adamczyk, L Adams, D L Adelman, J Adomeit, S Adye, T Affolder, A A Agatonovic-jovin, T Aguilar-saavedra, J A Agustoni, M Ahlen, S P Ahmadov, F Aielli, G Akerstedt, H Åkesson, T P A Akimoto, G Akimov, A V Alberghi, G L Albert, J Albrand, S Alconada Verzini, M J Aleksa, M Aleksandrov, I N Alexa, C Alexander, G Alexopoulos, T Alhroob, M Alimonti, G Alio, L Alison, J Alkire, S P Allbrooke, b M M Allport, P P Aloisio, A Alonso, A Alonso, F Alpigiani, C Altheimer, A Alvarez Gonzalez, b Piqueras, D Álvarez Alviggi, M G Amako, K Amaral Coutinho, Y Amelung, C Amidei, D Amor Dos Santos, S P Amorim, A Amoroso, S Amram, N Amundsen, G Anastopoulos, C Ancu, L S Andari, N Andeen, T Anders, C F Anders, G Anderson, K J Andreazza, A Andrei, V Angelidakis, S Angelozzi, I Anger, P Angerami, A Anghinolfi, F Anisenkov, A V Anjos, N Annovi, A Antonelli, M Antonov, A Antos, J Anulli, F Aoki, M Aperio bella, L Arabidze, G Arai, Y Araque, J P Arce, A T H Arduh, F A Arguin, J-f Argyropoulos, S Arik, M Armbruster, A J Arnaez, O Arnal, V Arnold, H Arratia, M Arslan, O Artamonov, A Artoni, G Asai, S Asbah, N Ashkenazi, A Åsman, b Asquith, L Assamagan, K Astalos, R Atkinson, M Atlay, N b Auerbach, b Augsten, K Aurousseau, M Avolio, G Axen, b Ayoub, M K Azuelos, G baak, M A baas, A E bacci, C bachacou, H bachas, K backes, M backhaus, M badescu, E bagiacchi, P bagnaia, P bai, Y bain, T baines, J T baker, O K balek, P balestri, T balli, F banas, E banerjee, Sw bannoura, A A E bansil, H S barak, L baranov, S P barberio, E L barberis, D barbero, M barillari, T barisonzi, M barklow, T barlow, N barnes, S L barnett, b M barnett, R M barnovska, Z baroncelli, A barone, G barr, A J barreiro, F barreiro Guimarães Da Costa, J bartoldus, R barton, A E bartos, P bassalat, A basye, A bates, R L batista, S J batley, J R battaglia, M bauce, M bauer, F bawa, H S beacham, J b beattie, M D beau, T beauchemin, P H beccherle, R bechtle, 85.CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France 113.Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman OK USA 152.Institute of Physics Academia Sinica Taipei Taiwan 11.Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan 107.Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam The Netherlands 90.Department of Physics and Astronomy Michigan State University East Lansing MI USA 159.Department of Physics University of Toronto Toronto ON Canada 154.Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel 153.Department of Physics Technion: Israel Institute of Technology Haifa Israel 30.CERN Geneva Switzerland 147.Department of Physics Stockholm University Stockholm Sweden 227.The Oskar Klein Centre Stockholm Sweden 165.INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy 229.ICTP Trieste Italy 38.Faculty of Physics and Applied Computer Science AGH University of Science and Technology Kraków Poland 25.Physics Department Brookhaven National Laboratory Upton NY USA 108.Department of Physics Northern Illinois University De Kalb IL USA 100.Fakult?t für Physik Ludwig-Maximilians-Universit?t München Munich Germany 131.Particle Physics Department Rutherford Appleton Laboratory Didcot UK 74.Oliver Lodge Laboratory University of Liverpool Liverpool UK 13.Institute of Physics University of Belgrade Belgrade Serbia 126.Laboratorio de Instrumentacao e Fisica Experimental de Particulas LIP Lisbon Portugal 215.Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain 17.Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics University of Bern Bern Switzerland 22.Department of Physics Boston University Boston MA USA 65.Joint Institute for Nuclear Research JINR Dubna Dubna Russia 134.INFN Sezione di Roma Tor Vergata Rome Ita

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Erratum to: Search for new phenomena in final states with an energetic jet and large missing transverse momentum in pp collisions at ...TeV with the ATLAS detector

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The European Physical Journal. C, Particles and Fields. 2015年第9期75卷 1页

作者： Aad, G Abbott, b Abdallah, J Abdel Khalek, S Abdinov, O Aben, R Abi, b Abolins, M Abouzeid, O S Abramowicz, H Abreu, H Abreu, R Abulaiti, Y Acharya, b S Adamczyk, L Adams, D L Adelman, J Adomeit, S Adye, T Agatonovic-jovin, T Aguilar-saavedra, J A Agustoni, M Ahlen, S P Ahmadov, F Aielli, G Akerstedt, H Åkesson, T P A Akimoto, G Akimov, A V Alberghi, G L Albert, J Albrand, S Alconada Verzini, M J Aleksa, M Aleksandrov, I N Alexa, C Alexander, G Alexandre, G Alexopoulos, T Alhroob, M Alimonti, G Alio, L Alison, J Allbrooke, b M M Allison, L J Allport, P P Aloisio, A Alonso, A Alonso, F Alpigiani, C Altheimer, A Alvarez Gonzalez, b Alviggi, M G Amako, K Amaral Coutinho, Y Amelung, C Amidei, D Amor Dos Santos, S P Amorim, A Amoroso, S Amram, N Amundsen, G Anastopoulos, C Ancu, L S Andari, N Andeen, T Anders, C F Anders, G Anderson, K J Andreazza, A Andrei, V Anduaga, X S Angelidakis, S Angelozzi, I Anger, P Angerami, A Anghinolfi, F Anisenkov, A V Anjos, N Annovi, A Antonelli, M Antonov, A Antos, J Anulli, F Aoki, M Aperio bella, L Arabidze, G Arai, Y Araque, J P Arce, A T H Arduh, F A Arguin, J-f Argyropoulos, S Arik, M Armbruster, A J Arnaez, O Arnal, V Arnold, H Arratia, M Arslan, O Artamonov, A Artoni, G Asai, S Asbah, N Ashkenazi, A Åsman, b Asquith, L Assamagan, K Astalos, R Atkinson, M Atlay, N b Auerbach, b Augsten, K Aurousseau, M Avolio, G Axen, b Ayoub, M K Azuelos, G baak, M A baas, A E bacci, C bachacou, H bachas, K backes, M backhaus, M bagiacchi, P bagnaia, P bai, Y bain, T baines, J T baker, O K balek, P balestri, T balli, F banas, E banerjee, Sw bannoura, A A E bansil, H S barak, L baranov, S P barberio, E L barberis, D barbero, M barillari, T barisonzi, M barklow, T barlow, N barnes, S L barnett, b M barnett, R M barnovska, Z baroncelli, A barone, G barr, A J barreiro, F barreiro Guimarães Da Costa, J bartoldus, R barton, A E bartos, P bassalat, A basye, A bates, R L batista, S J batley, J R battaglia, M bauce, M bauer, F bawa, H S beacham, J b beattie, M D beau, T beauchemin, P H beccherle, R bech 85.CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France 113.Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman OK USA 152.Institute of Physics Academia Sinica Taipei Taiwan 117.LAL Université Paris-Sud and CNRS/IN2P3 Orsay France 11.Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan 107.Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam The Netherlands 114.Department of Physics Oklahoma State University Stillwater OK USA 90.Department of Physics and Astronomy Michigan State University East Lansing MI USA 159.Department of Physics University of Toronto Toronto ON Canada 154.Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel 153.Department of Physics Technion: Israel Institute of Technology Haifa Israel 30.CERN Geneva Switzerland 147.Department of Physics Stockholm University Stockholm Sweden The Oskar Klein Centre Stockholm Sweden 165.INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy Dipartimento di Chimica Fisica e Ambiente Università di Udine Udine Italy 38.Faculty of Physics and Applied Computer Science AGH University of Science and Technology Kraków Poland Marian Smoluchowski Institute of Physics Jagiellonian University Kraków Poland 25.Physics Department Brookhaven National Laboratory Upton NY USA 108.Department of Physics Northern Illinois University De Kalb IL USA 100.Fakult?t für Physik Ludwig-Maximilians-Universit?t München Munich Germany 131.Particle Physics Department Rutherford Appleton Laboratory Didcot UK 13.Institute of Physics University of Belgrade Belgrade Serbia 126.Laboratorio de Instrumentacao e Fisica Experimental de Particulas-LIP Lisbon Portugal Faculdade de Ciências Universidade de Lisboa Lisbon Portugal Department of Physics University of Coimbra Coimbra Portugal Centro de Física Nuclear da Universidade de Lisboa Lisbon P

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Towards a methodological approach to identify future M&S standard needs

Towards a methodological approach to identify future M&S sta...

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2011 Winter Simulation Conference, WSC 2011

作者： Tolk, Andreas balci, Osman Diallo, Saikou Y. Fishwick, Paul A. Hu, Xiaolin Loper, Margaret Petty, Mikel D. Reynolds Jr., Paul F. Sarjoughian, Hessam Zeigler, bernard P. Old Dominion University Engineering Management and Systems Engineering 241 Kaufman Hall Norfolk VA 23529 United States Virginia Tech. Department of Computer Science 3160B Torgersen Hall Blacksburg VA 24061 United States Virginia Modeling Analysis and Simulation Center Old Dominion University 1030 University Blvd Suffolk VA 23435 United States University of Florida Digital Arts and Sciences CISE Department Gainesville FL 32611 United States Georgia State University Computer Science Department Atlanta GA 30303 United States Georgia Tech. Research Institute Information and Communications Laboratory Atlanta GA 30318 United States University of Alabama in Huntsville Shelby Center 144 301 Sparkman Drive Huntsville AL 35899 United States University of Virginia 151 Engineer's Way Charlottesville VA 22901 United States Arizona State University Center for Integrative Modeling and Simulation Tempe AZ 85271 United States RTSync Corp. 11900 Parklawn Dr. Rockville MD 20852 United States

ISBN: (纸本)9781457721083

Although Modeling and Simulation is successfully applied for several decades, the community only established a handful of M&S specific standards. Although the standards were applied enabling worldwide distributed simulation applications, in particular in the training application domain of military simulation systems, the general success of M&S standard efforts and their potential for general applicability has been debated repeatedly during several conferences and workshop. This collection of position statements discusses related questions, such as, "What makes M&S special that we need M&S standards," "Are M&S standards truly different from Software engineering Standards," and "What metrics can be used to measure M&S standard success," and tries to contribute to establishing a methodological approach to identify future M&S standard needs. These position statements have been contributed in preparation of a panel discussion and edited for the supporting proceedings. © 2011 IEEE.

关键词： Military applications

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Measurements of four-lepton production at the Z resonance in pp collisions at sqrt[s] = 7 and 8 TeV with ATLAS

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Physical Review Letters [Phys Rev Lett] 2014年第23期112卷 231806-231806页

作者： Aad Abbott Abdallah Abdel Khalek Abdinov Aben Abi Abolins AbouZeid O Abramowicz Abreu Abulaiti Acharya b Adamczyk Adams D Adelman Adomeit Adye Agatonovic-Jovin Aguilar-Saavedra J Agustoni Ahlen S Ahmad Ahmadov Aielli Akerstedt Åkesson T Akimoto Akimov A Alberghi G Albert Albrand Alconada Verzini M Aleksa Aleksandrov I Alexa Alexander Alexandre Alexopoulos Alhroob Alimonti Alio Alison Allbrooke b Allison L Allport P Allwood-Spiers S Almond Aloisio Alonso Alpigiani Altheimer Alvarez Gonzalez Alviggi M Amako Amaral Coutinho Amelung Amidei Amor Dos Santos S Amorim Amoroso Amram Amundsen Anastopoulos Ancu L Andari Andeen Anders C Anders Anderson K Andreazza Andrei Anduaga X Angelidakis Angelozzi Anger Angerami Anghinolfi Anisenkov A Anjos Annovi Antonaki Antonelli Antonov Antos Anulli Aoki Aperio bella Apolle Arabidze Aracena Arai Araque J Arce A Arguin J Argyropoulos Arik Armbruster A Arnaez Arnal Arnold Arslan Artamonov Artoni Asai Asbah Ashkenazi Asman Asquith Assamagan Astalos Atkinson Atlay N Auerbach Augsten Aurousseau Avolio Azuelos Azuma baak M bacci bachacou bachas backes backhaus backus Mayes badescu bagiacchi bagnaia bai bain baines J baker O baker balek balli banas banerjee banfi bangert bannoura A bansal bansil H barak baranov S barberio E barberis barbero barillari barisonzi barklow barlow barnett b barnett R barnovska baroncelli barone barr A barreiro barreiro Guimarães da Costa bartoldus barton A bartos bartsch bassalat basye bates R batkova batley J battistin bauer bawa H beau beauchemin P beccherle bechtle beck H becker beckingham becot beddall A beddall bedikian bednyakov V bee C beemster L beermann T begel behr belanger-Champagne bell P bell W bella bellagamba bellerive bellomo belloni beloborodova O belotskiy beltramello benary benchekroun bendtz benekos benhammou benhar Noccioli benitez Garcia J benjamin D bensinger J benslama bentvelsen berge bergeaas Kuutmann berger berghaus berglund beringer bernard bernat bernius bernlochner F berry berta bertella bertolucci bertsche besana M besjes G bessids 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 Ontario Canada Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel CERN Geneva Switzerland Department of Physics Stockholm University Sweden and The Oskar Klein Centre Stockholm Sweden INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy and 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 and Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada (Spain) Portugal 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 Departments of Physics & Astronomy and Chemistry Stony Brook University Stony Brook New York USA Joint Institute for Nuclear Research JINR Dubna Dubna Russia INFN Sezione di Roma Tor

Measurements of four-lepton (4ℓ, ℓ=e,μ) production cross sections at the Z resonance in pp collisions at the LHC with the ATLAS detector are presented. For dilepton and four-lepton invariant mass regions m(ℓ+ℓ(-)) > 5 GeV and 80b and 107 ± 9(stat) ± 4(syst) ± 3.0(lumi) fb at sqrt[s] = 7 and 8 TeV, respectively. by subtracting the nonresonant 4ℓ production contributions and normalizing with Z → μ(+)μ(-) events, the branching fraction for the Z boson decay to 4ℓ is determined to be (3.20 ± 0.25(stat) ± 0.13(syst)) × 10(-6), consistent with the standard model prediction.

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Measurement of Top Quark Polarization in Top-Antitop Events from Proton-Proton Collisions at s=7 TeV Using the ATLAS Detector

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Physical Review Letters 2013年第23期111卷 232002-232002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 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. bassalat A. ba 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 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 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 à l’Energie Atomique et aux Energies Alternatives) Gif-sur-Yvette France Department of Physics Stockholm University Sweden The Oskar Klein Centre Stockholm Sweden 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 Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Department of Physics Brandeis University Waltham Massachusetts USA Vinca Institute of Nuclear Sciences University of Belgrade Belgrade Serbia 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

This Letter presents measurements of the polarization of the top quark in top-antitop quark pair events, using 4.7 fb−1 of proton-proton collision data recorded with the ATLAS detector at the Large Hadron Collider at s=7 TeV. Final states containing one or two isolated leptons (electrons or muons) and jets are considered. Two measurements of αℓP, the product of the leptonic spin-analyzing power and the top quark polarization, are performed assuming that the polarization is introduced by either a CP conserving or a maximally CP violating production process. The measurements obtained, αℓPCPC=−0.035±0.014(stat)±0.037(syst) and αℓPCPV=0.020±0.016(stat)−0.017+0.013(syst), are in good agreement with the standard model prediction of negligible top quark polarization.

关键词： POLARIZATION (Nuclear physics) PROTON-proton interactions LARGE Hadron Collider (France & Switzerland) STANDARD model (Nuclear physics) MONTE Carlo method

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Measurement of the Azimuthal Angle Dependence of Inclusive Jet Yields in Pb+Pb Collisions at sNN=2.76 TeV with the ATLAS Detector

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Physical Review Letters 2013年第15期111卷 152301-152301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 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. basye R. L. 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 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 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 à l’Energie Atomique et aux Energies Alternatives) Gif-sur-Yvette France Department of Physics Stockholm University Stockholm Sweden The Oskar Klein Centre Stockholm Sweden INFN Gruppo Collegato di Udine 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 Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Department of Physics Brandeis University Waltham Massachusetts USA Vinca Institute of Nuclear Sciences University of Belgrade Belgrade Serbia Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Albert Einstein Center for Fundamental Physics and Laborato

Measurements of the variation of inclusive jet suppression as a function of relative azimuthal angle, Δϕ, with respect to the elliptic event plane provide insight into the path-length dependence of jet quenching. ATLAS has measured the Δϕ dependence of jet yields in 0.14 nb−1 of sNN=2.76 TeV Pb+Pb collisions at the LHC for jet transverse momenta pT>45 GeV in different collision centrality bins using an underlying event subtraction procedure that accounts for elliptic flow. The variation of the jet yield with Δϕ was characterized by the parameter, v2jet, and the ratio of out-of-plane (Δϕ∼π/2) to in-plane (Δϕ∼0) yields. Nonzero v2jet values were measured in all centrality bins for pT<160 GeV. The jet yields are observed to vary by as much as 20% between in-plane and out-of-plane directions.

关键词： AZIMUTHAL projection (Cartography) LEAD COLLISIONS (Nuclear physics) METALS -- Quenching LARGE Hadron Collider (France & Switzerland)

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Reversible fragile medical image watermarking with zero distortion

Reversible fragile medical image watermarking with zero dist...

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2010 International Conference on computer and Communication technology, ICCCT-2010

作者： Dharwadkar, Nagaraj V. Amberker, b.b. Supriya Panchannavar, Prateeksha b. Computer Science and Engineering National Institute of Technology Warangal Andhra Pradesh India Information Science and Engineering B. L. D. A's College of Engg. and Tech. Bijapur Karnatak India

ISBN: (纸本)9781424490349

The modern telemedicine often lacks in the infrastructure to deploy image security standards. The fragile watermarking scheme provides good security solution to medical images in telemedicine. In this paper, we present a reversible (distortion free), fragile, spatial domain watermarking scheme for medical images. The medical image authenticity and security can be achieved by two modes of watermarking operations. In the first mode, the watermark (fingerprint) is embedded into host image and later, for copy-right justification the watermark (fingerprint) is extracted from host image. In the second mode of the operation the watermark (fingerprint) is extracted from unaltered components of the image ie. stored as the key. Later, this key information is used for recovering the watermark. The proposed scheme uses the second mode of operation which extracts the watermark from the unaltered pixel components of image. The extracted watermark is used for copy-right justification. As medical images have zero tolerance for noise our scheme produces noise free watermarked medical images. The scheme is robust to different types of attacks. The fragility and robustness of the scheme is analyzed considering different types of image processing attacks. ©2010 IEEE.

关键词： Image watermarking

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