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Search for long-lived stopped R-hadrons decaying out of time with pp collisions using the ATLAS detector

Physical Review D 2013年第11期88卷 112003-112003页

作者： G. Aad T. Ab.jyan b. Ab.ott J. Ab.allah S. Ab.el Khalek O. Ab.inov R. Ab.n b. Ab. M. Ab.lins O. S. Ab.uZeid H. Ab.amowicz H. Ab.eu Y. Ab.laiti 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 F. Ahmadov M. Ahsan G. Aielli T. P. A. Åkesson G. Akimoto A. V. Akimov M. A. Alam J. Alb.rt S. Alb.and 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. Allb.ooke 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 b.lla R. Apolle G. Arab.dze I. Aracena Y. Arai A. T. H. Arce S. Arfaoui J-F. Arguin S. Argyropoulos E. Arik M. Arik A. J. Armb.uster O. Arnaez V. Arnal O. Arslan A. Artamonov G. Artoni S. Asai N. Asb.h S. Ask b. Åsman L. Asquith K. Assamagan R. Astalos A. Astb.ry M. Atkinson N. b. Atlay b. Auerb.ch E. Auge K. Augsten M. Aurousseau G. Avolio D. Axen G. Azuelos Y. Azuma M. A. b.ak C. b.cci A. M. b.ch H. b.chacou K. b.chas M. b.ckes M. b.ckhaus J. b.ckus Mayes E. b.descu P. b.giacchi P. b.gnaia Y. b.i D. C. b.iley T. b.in J. T. b.ines O. K. b.ker S. b.ker P. b.lek F. b.lli E. b.nas Sw. b.nerjee D. b.nfi A. b.ngert V. b.nsal H. S. b.nsil L. b.rak S. P. b.ranov T. b.rb.r E. L. b.rb.rio D. b.rb.ris M. b.rb.ro D. Y. b.rdin T. b.rillari M. b.risonzi T. b.rklow N. b.rlow b. M. b.rnett R. M. b.rnett A. b.roncelli G. b.rone A. J. b.rr F. b.rreiro J. b.rreiro Guimarães da Costa R. b.rtoldus A. E. b.rton V. b.rtsch A. b.s 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

An updated search is performed for gluino, top squark, or b.ttom squark R-hadrons that have come to rest within the ATLAS calorimeter, and decay at some later time to hadronic jets and a neutralino, using 5.0 and 22.9 fb.1 of pp collisions at 7 and 8 TeV, respectively. Candidate decay events are triggered in selected empty b.nch crossings of the LHC in order to remove pp collision b.ckgrounds. Selections b.sed on jet shape and muon system activity are applied to discriminate signal events from cosmic ray and b.am-halo muon b.ckgrounds. In the ab.ence of an excess of events, improved limits are set on gluino, stop, and sb.ttom masses for different decays, lifetimes, and neutralino masses. With a neutralino of mass 100 GeV, the analysis excludes gluinos with mass b.low 832 GeV (with an expected lower limit of 731 GeV), for a gluino lifetime b.tween 10 μs and 1000 s in the generic R-hadron model with equal b.anching ratios for decays to qq¯χ˜0 and gχ˜0. Under the same assumptions for the neutralino mass and squark lifetime, top squarks and b.ttom squarks in the Regge R-hadron model are excluded with masses b.low 379 and 344 GeV, respectively.

关键词： NUCLEAR counters HADRONS -- Decay COLLISIONS (Nuclear physics) CALORIMETRY MUONS

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Search for microscopic b.ack holes in a like-sign dimuon final state using large track multiplicity with the ATLAS detector

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Physical Review D 2013年第7期88卷 072001-072001页

作者： G. Aad T. Ab.jyan b. Ab.ott J. Ab.allah S. Ab.el Khalek O. Ab.inov R. Ab.n b. Ab. M. Ab.lins O. S. Ab.uZeid H. Ab.amowicz H. Ab.eu Y. Ab.laiti 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 F. Ahmadov M. Ahsan G. Aielli T. P. A. Åkesson G. Akimoto A. V. Akimov M. A. Alam J. Alb.rt S. Alb.and 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. Allb.ooke 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 b.lla R. Apolle G. Arab.dze I. Aracena Y. Arai A. T. H. Arce S. Arfaoui J-F. Arguin S. Argyropoulos E. Arik M. Arik A. J. Armb.uster O. Arnaez V. Arnal O. Arslan A. Artamonov G. Artoni S. Asai N. Asb.h S. Ask b. Åsman L. Asquith K. Assamagan R. Astalos A. Astb.ry M. Atkinson N. b. Atlay b. Auerb.ch E. Auge K. Augsten M. Aurousseau G. Avolio D. Axen G. Azuelos Y. Azuma M. A. b.ak C. b.cci A. M. b.ch H. b.chacou K. b.chas M. b.ckes M. b.ckhaus J. b.ckus Mayes E. b.descu P. b.giacchi P. b.gnaia Y. b.i D. C. b.iley T. b.in J. T. b.ines O. K. b.ker S. b.ker P. b.lek F. b.lli E. b.nas Sw. b.nerjee D. b.nfi A. b.ngert V. b.nsal H. S. b.nsil L. b.rak S. P. b.ranov T. b.rb.r E. L. b.rb.rio D. b.rb.ris M. b.rb.ro D. Y. b.rdin T. b.rillari M. b.risonzi T. b.rklow N. b.rlow b. M. b.rnett R. M. b.rnett A. b.roncelli G. b.rone A. J. b.rr F. b.rreiro J. b.rreiro Guimarães da Costa R. b.rtoldus A. E. b.rton V. b.rtsch A. b.s 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 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 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 Labora

A search is presented for microscopic b.ack holes in a like-sign dimuon final state in proton–proton collisions at s=8 TeV. The data were collected with the ATLAS detector at the Large Hadron Collider in 2012 and correspond to an integrated luminosity of 20.3 fb.1. Using a high track multiplicity requirement, 0.6±0.2 b.ckground events from Standard Model processes are predicted and none ob.erved. This result is interpreted in the context of low-scale gravity models and 95% C.L. lower limits on microscopic b.ack hole masses are set for different model assumptions.

关键词： b.ACK holes (Astronomy) MICROSCOPY MUONS PARTICLES (Nuclear physics) -- Multiplicity PROTON-proton interactions LUMINOSITY GRAVITY LARGE Hadron Collider (France & Switzerland)

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Search for charginos nearly mass degenerate with the lightest neutralino b.sed on a disappearing-track signature in pp collisions at (s)=8 TeV with the ATLAS detector

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Physical Review D 2013年第11期88卷 112006-112006页

作者： G. Aad T. Ab.jyan b. Ab.ott J. Ab.allah S. Ab.el Khalek O. Ab.inov R. Ab.n b. Ab. M. Ab.lins O. S. Ab.uZeid H. Ab.amowicz H. Ab.eu Y. Ab.laiti 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 F. Ahmadov M. Ahsan G. Aielli T. P. A. Åkesson G. Akimoto A. V. Akimov M. A. Alam J. Alb.rt S. Alb.and 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. Allb.ooke 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 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 b.lla R. Apolle G. Arab.dze I. Aracena Y. Arai A. T. H. Arce S. Arfaoui J-F. Arguin S. Argyropoulos E. Arik M. Arik A. J. Armb.uster O. Arnaez V. Arnal O. Arslan A. Artamonov G. Artoni S. Asai N. Asb.h S. Ask b. Åsman L. Asquith K. Assamagan R. Astalos A. Astb.ry M. Atkinson N. b. Atlay b. Auerb.ch E. Auge K. Augsten M. Aurousseau G. Avolio G. Azuelos Y. Azuma M. A. b.ak C. b.cci A. M. b.ch H. b.chacou K. b.chas M. b.ckes M. b.ckhaus J. b.ckus Mayes E. b.descu P. b.giacchi P. b.gnaia Y. b.i D. C. b.iley T. b.in J. T. b.ines O. K. b.ker S. b.ker P. b.lek F. b.lli E. b.nas Sw. b.nerjee D. b.nfi A. b.ngert V. b.nsal H. S. b.nsil L. b.rak S. P. b.ranov T. b.rb.r E. L. b.rb.rio D. b.rb.ris M. b.rb.ro D. Y. b.rdin T. b.rillari M. b.risonzi T. b.rklow N. b.rlow b. M. b.rnett R. M. b.rnett A. b.roncelli G. b.rone A. J. b.rr F. b.rreiro J. b.rreiro Guimarães da Costa R. b.rtoldus A. E. b.rton V. b.rtsch A. 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

A search is presented for direct chargino production b.sed on a disappearing-track signature using 20.3 fb.1 of proton-proton collisions at s=8 TeV collected with the ATLAS experiment at the LHC. In anomaly-mediated supersymmetry b.eaking (AMSb. models, the lightest chargino is nearly mass degenerate with the lightest neutralino and its lifetime is long enough to b. detected in the tracking detectors b. identifying decays that result in tracks with no associated hits in the outer region of the tracking system. Some models with supersymmetry also predict charginos with a significant lifetime. This analysis attains sensitivity for charginos with a lifetime b.tween 0.1 and 10 ns, and significantly surpasses the reach of the LEP experiments. No significant excess ab.ve the b.ckground expectation is ob.erved for candidate tracks with large transverse momentum, and constraints on chargino properties are ob.ained. In the AMSb.scenarios, a chargino mass b.low 270 GeV is excluded at 95% confidence level.

关键词： NUCLEAR counters CHARGINOS COLLISIONS (Nuclear physics) SUPERSYMMETRY (Physics) NEUTRALINOS

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Search for nonpointing photons in the diphoton and ETmiss final state in s=7 TeV proton-proton collisions using the ATLAS detector

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Physical Review D 2013年第1期88卷 012001-012001页

作者： G. Aad T. Ab.jyan b. Ab.ott J. Ab.allah S. Ab.el Khalek A. A. Ab.elalim O. Ab.inov R. Ab.n b. Ab. M. Ab.lins O. S. Ab.uZeid H. Ab.amowicz H. Ab.eu Y. Ab.laiti b. S. Acharya L. Adamczyk D. L. Adams T. N. Addy J. Adelman S. Adomeit T. Adye S. Aefsky J. A. Aguilar-Saavedra M. Agustoni S. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli T. P. A. Åkesson G. Akimoto A. V. Akimov M. A. Alam J. Alb.rt S. Alb.and 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 J. Alison b. M. M. Allb.ooke 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. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli M. Aoki L. Aperio b.lla R. Apolle G. Arab.dze I. Aracena Y. Arai A. T. H. Arce S. Arfaoui J.-F. Arguin S. Argyropoulos E. Arik M. Arik A. J. Armb.uster O. Arnaez V. Arnal A. Artamonov G. Artoni D. Arutinov S. Asai N. Asb.h S. Ask b. Åsman L. Asquith K. Assamagan R. Astalos A. Astb.ry M. Atkinson b. Auerb.ch E. Auge K. Augsten M. Aurousseau G. Avolio D. Axen G. Azuelos Y. Azuma M. A. b.ak G. b.ccaglioni C. b.cci A. M. b.ch H. b.chacou K. b.chas M. b.ckes M. b.ckhaus J. b.ckus Mayes E. b.descu P. b.giacchi P. b.gnaia Y. b.i D. C. b.iley T. b.in J. T. b.ines O. K. b.ker S. b.ker P. b.lek F. b.lli E. b.nas P. b.nerjee Sw. b.nerjee D. b.nfi A. b.ngert V. b.nsal H. S. b.nsil L. b.rak S. P. b.ranov T. b.rb.r E. L. b.rb.rio D. b.rb.ris M. b.rb.ro D. Y. b.rdin T. b.rillari M. b.risonzi T. b.rklow N. b.rlow b. M. b.rnett R. M. b.rnett A. b.roncelli G. b.rone A. J. b.rr F. b.rreiro J. b.rreiro Guimarães da Costa R. b.rtoldus A. E. b.rton V. b.rtsch 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 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 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 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 Phys

A search has b.en performed for photons originating in the decay of a neutral long-lived particle, exploiting the capab.lities of the ATLAS electromagnetic calorimeter to make precise measurements of the flight direction of photons, as well as the calorimeter’s excellent time resolution. The search has b.en made in the diphoton plus missing transverse energy final state, using the full data sample of 4.8 fb.1 of 7 TeV proton-proton collisions collected in 2011 with the ATLAS detector at the LHC. No excess is ob.erved ab.ve the b.ckground expected from Standard Model processes. The results are used to set exclusion limits in the context of gauge mediated supersymmetry b.eaking models, with the lightest neutralino b.ing the next-to-lightest supersymmetric particle and decaying with a lifetime in excess of 0.25 ns into a photon and a gravitino.

关键词： Search nonpointing photons diphoton Atlas Collisions atlas Disintegration Searches terminal states Calorimeters Photon detector

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Employing sensor network to guide firefighters in dangerous area

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International Journal of engineering, Transactions A: b.sics 2010年第2期23卷 191-202页

作者： Koohi, Hamidreza Nadernejad, Ehsan Fathi, Mahmoud Department of Computer Engineering Shomal University Iran Department of Photonic Technical University of Denmark B. 343 2800 Lyngby Denmark Department of Computer Engineering University of Science and Technology Iran

In this paper, we intend to focus on the sensor network applications in firefighting. A distrib.ted algorithm is developed for the sensor network to guide firefighters through a b.rning area. The sensor network models the danger of the area under coverage as ob.tacles, and has the property to adapt itself against possib.e changes. The protocol developed, will integrate the artificial potential field of the sensors with the information of the intended place of moving firefighter so that it guides the firefighter step b. step through the sensor network b. choosing the safest path in dangerous zones. This protocol is simulated b. Visual-Sense and the simulation results are availab.e.

关键词： Sensor networks

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Crosstalk and Power Reduction Using b.s Encoding in RC Coupled VLSI Interconnects

Crosstalk and Power Reduction Using Bus Encoding in RC Coupl...

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International Conference on Emerging Trends in engineering and technology, ICETET

作者： S.K. Verma b.K. Kaushik Department of Computer Science & Engineering G. B. Pant Engineering College India Department of Electronics and Computer Engineering Indian Institute of Technology Roorkee Roorkee India

For System on-chip (SoC) designs in current Deep Sub.icron (DSM) era, interconnects play important role in overall performance of the chip. The factors such as propagation delay, power dissipation and crosstalk through RC modeled interconnects sub.tantially affects the entire working of the chip. Functional crosstalk and crosstalk induced propagation delay have recently emerged as major sources of faults. The crosstalk effect is a consequence of coupling and switching activities that is encountered when there is a transition in previous state of wire as well as when transitions are in adjacent wires. Therefore, minimization or elimination of switching and coupling activities is crucial in enhancing the performance of SoC designs. This paper proposes encoding schemes in order to achieve reduction in transitions b.tween the previous and present states of wire as well as transitions in adjacent wires. The reduction in transition improves the performance in terms of power dissipation, coupling activity and delay in on-chip b.s.

关键词： Couplings Wire Encoding Capacitance Crosstalk Radiation detectors Switches

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Handling imprecision in inputs using fuzzy logic to predict effort in software development

Handling imprecision in inputs using fuzzy logic to predict ...

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IEEE International Advance Computing Conference, IACC

作者： Harsh Kumar Verma Vishal Sharma Department of Computer Science and Engineering Dr B. R. Ambedkar National Institute of Technology Jalandhar India

ISBN: (纸本)9781424447909;9781424447916

Accurate, precise and reliab.e estimates of effort at early stages of project development holds great significance for the industry to meet the competitive demands of today's world. The inherent imprecision present in the inputs of the algorithmic models like constructive cost model (COCOMO) yields imprecision in the output, resulting in erroneous effort estimation. The development of software is characterized b. parameters that possess certain level of fuzziness which requires that some degree of uncertainty b. introduced in the models, in order to make the models realistic. Fuzzy logic b.sed cost estimation models enab.e linguistic representation of the input and output of a model to address the vagueness and imprecision in the inputs, to make reliab.e and accurate estimates of effort. In this paper, we present an enhanced fuzzy logic b.sed framework for software development effort prediction. The intermediate COCOMO is extended in the proposed study b. incorporating the concept of fuzziness into the measurements of size, mode of development for projects and the cost drivers contrib.ting to the overall development effort. The said framework tolerates imprecision, incorporates experts knowledge, explains prediction rationale through rules, offers transparency in the prediction system, and could adapt to changing environments with the availab.lity of new data.

关键词： Fuzzy logic Programming Costs Predictive models computer science Reliab.lity engineering Uncertainty Software algorithms Software engineering Costing

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Reversib.e fragile medical image watermarking with zero distortion

Reversible fragile medical image watermarking with zero dist...

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International Conference on computer and Communication technology (ICCCT)

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

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 reversib.e (distortion free), fragile, spatial domain watermarking scheme for medical images. The medical image authenticity and security can b. achieved b. two modes of watermarking operations. In the first mode, the watermark (fingerprint) is emb.dded into host image and later, for copyright 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 rob.st to different types of attacks. The fragility and rob.stness of the scheme is analyzed considering different types of image processing attacks.

关键词： Watermarking Pixel Medical diagnostic imaging Telemedicine Streaming media

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An Efficient Ear Identification System

An Efficient Ear Identification System

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International Conference on Future Information technology (Futuretech)

作者： Dakshina Ranjan Kisku Sandesh Gupta Phalguni Gupta Jamuna Kanta Sing Computer Science & Engineering Department Dr. B. C. Roy Engineering College Durgapur India Computer Science & Engineering Department CSJM University Kanpur India Computer Science & Engineering Department Indian Institute of Technology Kanpur India Computer Science & Engineering Department Jadavpur University India

This paper proposes a rob.st ear identification system which is developed b. fusing SIFT features of color segmented slice regions of an ear. It makes use of Gaussian mixture model (GMM) to b.ild ear model with mixture of Gaussian using vector quantization algorithm and K-L divergence is applied to the GMM framework for recording the color similarity in the specified ranges b. comparing color similarity b.tween a pair of reference ear and prob. ear. SIFT features are extracted from each color slice region as a part of invariant feature extraction. The extracted keypoints are then fused separately b. the two fusion approaches, namely concatenation and the Dempster-Shafer theory. Finally, the fusion approaches generate two independent augmented feature vectors for identification of individuals separately. The proposed technique is tested on IIT Kanpur ear datab.se of 400 individuals and is found to achieve 98.25% accuracy for identification of top 5 b.st matches.

关键词： Ear b.ometrics Lighting Rob.stness Feature extraction Ob.ect recognition Principal component analysis computer vision Spatial datab.ses Pattern recognition

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Text document clustering b.sed on frequent concepts

Text document clustering based on frequent concepts

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International Conference on Parallel Distrib.ted and Grid Computing (PDGC)

作者： Rekha b.ghel Renu Dhir Department of Computer Science & Engineering Dr B. R. Ambedkar National Institute of Technology Jalandhar Punjab India

This paper presents a novel technique of document clustering b.sed on frequent concepts. The proposed FCDC (Frequent Concepts b.sed Document Clustering), a clustering algorithm works with frequent concepts rather than frequent itemsets used in traditional text mining techniques. Many well known clustering algorithms deal with documents as b.g of words while they ignore the important relationship b.tween words like synonym relationship. The proposed algorithm utilizes the semantic relationship b.tween words to create concepts. It exploits the WordNet ontology in turn to create low dimensional feature vector which allows developing a more accurate clustering algorithm.

关键词： Clustering algorithms Accuracy Grid computing Merging Datab.ses Wireless application protocol Ontologies

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