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Erratum to: Insight into particle production mechanisms via angular correlations of identified particles in pp collisions at s=7 TeV

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The European Physical Journal C 2019年第12期79卷 1-9页

作者： Adam, J. Adamová, d. Aggarwal, M. M. rinella, G. Aglieri Agnello, M. Agrawal, N. Ahammed, Z. Ahmad, S. Ahn, S. U. Aiola, S. Akindinov, A. Alam, S. N. Albuquerque, d. S. d. Aleksandrov, d. Alessandro, B. Alexandre, d. Molina, r. Alfaro Alici, A. Alkin, A. Alme, J. Alt, T. Altinpinar, S. Altsybeev, I. Prado, C. Alves Garcia An, M. Andrei, C. Andrews, H. A. Andronic, A. Anguelov, V. Anson, C. Antičić, T. Antinori, F. Antonioli, P. Anwar, r. Aphecetche, L. Appelshäuser, H. Arcelli, S. Arnaldi, r. Arnold, O. W. Arsene, I. C. Arslandok, M. Audurier, B. Augustinus, A. Averbeck, r. Azmi, M. d. Badalà, A. Baek, Y. W. Bagnasco, S. Bailhache, r. Bala, r. Baldisseri, A. Baral, r. C. Barbano, A. M. Barbera, r. Barile, F. Barioglio, L. Barnaföldi, G. G. Barnby, L. S. Barret, V. Bartalini, P. Barth, K. Bartke, J. Bartsch, E. Basile, M. Bastid, N. Basu, S. Bathen, B. Batigne, G. Camejo, A. Batista Batyunya, B. Batzing, P. C. Bearden, I. G. Beck, H. Bedda, C. Behera, N. K. Belikov, I. Bellini, F. Martinez, H. Bello Bellwied, r. Beltran, L. G. E. Belyaev, V. Bencedi, G. Beole, S. Bercuci, A. Berdnikov, Y. Berenyi, d. Bertens, r. A. Berzano, d. Betev, L. Bhasin, A. Bhat, I. r. Bhati, A. K. Bhattacharjee, B. Bhom, J. Bianchi, L. Bianchi, N. Bianchin, C. Bielčík, J. Bielčíková, J. Bilandzic, A. Biro, G. Biswas, r. Biswas, S. Blair, J. T. Blau, d. Blume, C. Bock, F. Bogdanov, A. Boldizsár, L. Bombara, M. Bonora, M. Book, J. Borel, H. Borissov, A. Borri, M. Botta, E. Bourjau, C. Braun-Munzinger, P. Bregant, M. Broker, T. A. Browning, T. A. Broz, M. Brucken, E. J. Bruna, E. Bruno, G. E. Budnikov, d. Buesching, H. Bufalino, S. Buhler, P. Buitron, S. A. I. Buncic, P. Busch, O. Buthelezi, Z. Butt, J. B. Buxton, J. T. Cabala, J. Caffarri, d. Caines, H. Caliva, A. Villar, E. Calvo Camerini, P. Capon, A. A. Carena, F. Carena, W. Carnesecchi, F. Castellanos, J. Castillo Castro, A. J. Casula, E. A. r. Sanchez, C. Ceballos Cerello, P. Cerkala, J. Chang, B. Chapeland, S. Chartier, M. Charvet, J. L. Chattopadhyay, S. Chauvin, A. Cherney, M. Cheshk Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in Prague Prague Czech Republic Nuclear Physics Institute Academy of Sciences of the Czech Republic Řež u Prahy Czech Republic Physics Department Panjab University Chandigarh India European Organization for Nuclear Research (CERN) Geneva Switzerland Dipartimento DISAT del Politecnico and Sezione INFN Turin Italy Sezione INFN Turin Italy Indian Institute of Technology Bombay (IIT) Mumbai India Variable Energy Cyclotron Centre Kolkata India Department of Physics Aligarh Muslim University Aligarh India Korea Institute of Science and Technology Information Daejeon South Korea Yale University New Haven United States Institute for Theoretical and Experimental Physics Moscow Russia Universidade Estadual de Campinas (UNICAMP) Campinas Brazil National Research Centre Kurchatov Institute Moscow Russia School of Physics and Astronomy University of Birmingham Birmingham United Kingdom Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico Centro Fermi-Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi’ Rome Italy Sezione INFN Bologna Italy Bogolyubov Institute for Theoretical Physics Kiev Ukraine Department of Physics and Technology University of Bergen Bergen Norway Faculty of Engineering Bergen University College Bergen Norway Frankfurt Institute for Advanced Studies Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany V. Fock Institute for Physics St. Petersburg State University St. Petersburg Russia Universidade de São Paulo (USP) São Paulo Brazil Central China Normal University Wuhan China National Institute for Physics and Nuclear Engineering Bucharest Romania Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Physics Department Creighton University Omaha United States Rudj

This document corrects two errors in Eur. Phys. J. C77 (2017) no. 8, 56: the incorrect referencing of Fig. 1 labels in three paragraphs in the results section and a missing acknowledgements section.

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Comparison of Fragmentation Functions for Jets dominated by Light Quarks and Gluons from pp and Pb+Pb Collisions in ATLAS

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Physical review Letters 2019年第4期123卷 042001-042001页

作者： M. Aaboud G. Aad B. Abbott O. Abdinov B. Abeloos d. K. Abhayasinghe S. H. Abidi O. S. AbouZeid N. L. Abraham H. Abramowicz H. Abreu Y. Abulaiti B. S. Acharya S. Adachi L. Adamczyk J. Adelman M. Adersberger A. Adiguzel T. Adye A. A. Affolder Y. Afik C. Agheorghiesei J. A. Aguilar-Saavedra F. Ahmadov G. Aielli S. Akatsuka T. P. A. Åkesson E. Akilli A. V. Akimov G. L. Alberghi J. Albert P. Albicocco M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa T. Alexopoulos M. Alhroob B. Ali G. Alimonti J. Alison S. P. Alkire C. Allaire B. M. M. Allbrooke B. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. A. Alshehri M. I. Alstaty B. Alvarez Gonzalez d. Álvarez Piqueras M. G. Alviggi B. T. Amadio Y. Amaral Coutinho L. Ambroz C. Amelung d. Amidei S. P. Amor dos Santos S. Amoroso C. S. Amrouche C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders J. K. Anders K. J. Anderson A. Andreazza V. Andrei C. r. Anelli S. Angelidakis I. Angelozzi A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony M. Antonelli d. J. A. Antrim F. Anulli M. Aoki J. A. Aparisi Pozo L. Aperio Bella G. Arabidze J. P. Araque V. Araujo Ferraz r. Araujo Pereira A. T. H. Arce r. E. Ardell F. A. Arduh J-F. Arguin S. Argyropoulos A. J. Armbruster L. J. Armitage A. Armstrong O. Arnaez H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Artz S. Asai N. Asbah A. Ashkenazi E. M. Asimakopoulou L. Asquith K. Assamagan r. Astalos r. J. Atkin M. Atkinson N. B. Atlay K. Augsten G. Avolio r. Avramidou M. K. Ayoub G. Azuelos A. E. Baas M. J. Baca H. Bachacou K. Bachas M. Backes P. Bagnaia M. Bahmani H. Bahrasemani A. J. Bailey J. T. Baines M. Bajic C. Bakalis O. K. Baker P. J. Bakker d. Bakshi Gupta E. M. Baldin P. Balek F. Balli W. K. Balunas J. Balz E. Banas A. Bandyopadhyay S. Banerjee A. A. E. Bannoura L. Barak W. M. Barbe E. L. Barberio d. Barberis M. Barbero T. Barillari M-S. Barisits J. Barkeloo T. Barklow N. Barlow r. Barnea S. L. Barnes B. M. Barnett r. M. Barnett Z. Barnovska-Blenessy A. Baroncelli Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan LAL Université Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Department of Physics Royal Holloway University of London Egham United Kingdom Department of Physics University of Toronto Toronto Ontario Canada Niels Bohr Institute University of Copenhagen Copenhagen Denmark Department of Physics and Astronomy University of Sussex Brighton United Kingdom 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 High Energy Physics Division Argonne National Laboratory Argonne Illinois USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics University of Tokyo Tokyo Japan AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Department of Physics Bogazici University Istanbul Turkey Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania Universidad de Granada Granada (Spain) Spain Laboratório de Instrumentação e Física Experimental de Partículas—LIP Portugal Joint Institute for Nuclear Research Dubna Russia INFN Sezione di Roma Tor Vergata Italy Dipartimento di Fisica Università di Roma Tor Vergata Roma Italy Faculty of Science Kyo

Charged-particle fragmentation functions for jets azimuthally balanced by a high-transverse-momentum, prompt, isolated photon are measured in 25 pb−1 of pp and 0.49 nb−1 of Pb+Pb collision data at 5.02 TeV per nucleon pair recorded with the ATLAS detector at the Large Hadron Collider. The measurements are compared to predictions of Monte Carlo generators and to measurements of inclusively selected jets. In pp collisions, a different jet fragmentation function in photon-tagged events from that in inclusive jet events arises from the difference in fragmentation between light quarks and gluons. The ratios of the fragmentation functions in Pb+Pb events to that in pp events are used to explore the parton color-charge dependence of jet quenching in the hot medium. In relatively peripheral collisions, fragmentation functions exhibit a similar modification pattern for photon-tagged and inclusive jets. However, photon-tagged jets are observed to have larger modifications than inclusive jets in central Pb+Pb events.

关键词： Quantum chromodynamics Quark & gluon jets Quark-gluon plasma relativistic heavy-ion collisions Strong interaction

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Observation of Electroweak Production of a Same-Sign W Boson Pair in Association with Two Jets in pp Collisions at s=13 TeV with the ATLAS detector

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Physical review Letters 2019年第16期123卷 161801-161801页

作者： M. Aaboud G. Aad B. Abbott O. Abdinov B. Abeloos d. K. Abhayasinghe S. H. Abidi O. S. AbouZeid N. L. Abraham H. Abramowicz H. Abreu Y. Abulaiti B. S. Acharya S. Adachi L. Adam C. Adam Bourdarios L. Adamczyk J. Adelman M. Adersberger A. Adiguzel T. Adye A. A. Affolder Y. Afik C. Agheorghiesei J. A. Aguilar-Saavedra F. Ahmadov G. Aielli S. Akatsuka T. P. A. Åkesson E. Akilli A. V. Akimov G. L. Alberghi J. Albert P. Albicocco M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa T. Alexopoulos M. Alhroob B. Ali G. Alimonti J. Alison S. P. Alkire C. Allaire B. M. M. Allbrooke B. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. A. Alshehri M. I. Alstaty B. Alvarez Gonzalez d. Álvarez Piqueras M. G. Alviggi B. T. Amadio Y. Amaral Coutinho A. Ambler L. Ambroz C. Amelung d. Amidei S. P. Amor dos Santos S. Amoroso C. S. Amrouche C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders J. K. Anders K. J. Anderson A. Andreazza V. Andrei C. r. Anelli S. Angelidakis I. Angelozzi A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony M. Antonelli d. J. A. Antrim F. Anulli M. Aoki J. A. Aparisi Pozo L. Aperio Bella G. Arabidze J. P. Araque V. Araujo Ferraz r. Araujo Pereira A. T. H. Arce r. E. Ardell F. A. Arduh J-F. Arguin S. Argyropoulos A. J. Armbruster L. J. Armitage A. Armstrong O. Arnaez H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Artz S. Asai N. Asbah E. M. Asimakopoulou L. Asquith K. Assamagan r. Astalos r. J. Atkin M. Atkinson N. B. Atlay K. Augsten G. Avolio r. Avramidou M. K. Ayoub A. M. Azoulay G. Azuelos A. E. Baas M. J. Baca H. Bachacou K. Bachas M. Backes P. Bagnaia M. Bahmani H. Bahrasemani A. J. Bailey J. T. Baines M. Bajic C. Bakalis O. K. Baker P. J. Bakker d. Bakshi Gupta S. Balaji E. M. Baldin P. Balek F. Balli W. K. Balunas J. Balz E. Banas A. Bandyopadhyay Sw. Banerjee A. A. E. Bannoura L. Barak W. M. Barbe E. L. Barberio d. Barberis M. Barbero T. Barillari M-S. Barisits J. Barkeloo T. Barklow r. Barnea S. L. Barnes B. M. Barnett r. M. Barn Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan LAL Université Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Department of Physics Royal Holloway University of London Egham United Kingdom Department of Physics University of Toronto Toronto Ontario Canada Niels Bohr Institute University of Copenhagen Copenhagen Denmark Department of Physics and Astronomy University of Sussex Brighton United Kingdom 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 High Energy Physics Division Argonne National Laboratory Argonne Illinois USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics University of Tokyo Tokyo Japan Institut für Physik Universität Mainz Mainz Germany AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Department of Physics Bogazici University Istanbul Turkey Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania Universidad de Granada Granada (Spain) Spain Laboratório de Instrumentação e Física Experimental de Partículas-LIP Portugal Joint Institute for Nuclear Research Dubna Russia INFN Sezione di Roma Tor Vergata Italy Dipartimento di Fisica Università d

This Letter presents the observation and measurement of electroweak production of a same-sign W boson pair in association with two jets using 36.1 fb−1 of proton-proton collision data recorded at a center-of-mass energy of s=13 TeV by the ATLAS detector at the Large Hadron Collider. The analysis is performed in the detector fiducial phase-space region, defined by the presence of two same-sign leptons, electron or muon, and at least two jets with a large invariant mass and rapidity difference. A total of 122 candidate events are observed for a background expectation of 69±7 events, corresponding to an observed signal significance of 6.5 standard deviations. The measured fiducial signal cross section is σfid=2.89−0.48+0.51(stat)−0.28+0.29(syst) fb.

关键词： Electroweak interaction W & Z bosons Particle production Precision measurements

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Search for the Production of a Long-Lived Neutral Particle decaying within the ATLAS Hadronic Calorimeter in Association with a Z Boson from pp Collisions at s=13 TeV

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Physical review Letters 2019年第15期122卷 151801-151801页

作者： M. Aaboud G. Aad B. Abbott O. Abdinov B. Abeloos d. K. Abhayasinghe S. H. Abidi O. S. AbouZeid N. L. Abraham H. Abramowicz H. Abreu Y. Abulaiti B. S. Acharya S. Adachi L. Adam L. Adamczyk J. Adelman M. Adersberger A. Adiguzel T. Adye A. A. Affolder Y. Afik C. Agheorghiesei J. A. Aguilar-Saavedra F. Ahmadov G. Aielli S. Akatsuka T. P. A. Åkesson E. Akilli A. V. Akimov G. L. Alberghi J. Albert P. Albicocco M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa d. Alexandre T. Alexopoulos M. Alhroob B. Ali G. Alimonti J. Alison S. P. Alkire C. Allaire B. M. M. Allbrooke B. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. A. Alshehri M. I. Alstaty B. Alvarez Gonzalez d. Álvarez Piqueras M. G. Alviggi B. T. Amadio Y. Amaral Coutinho A. Ambler L. Ambroz C. Amelung d. Amidei S. P. Amor dos Santos S. Amoroso C. S. Amrouche F. An C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders J. K. Anders K. J. Anderson A. Andreazza V. Andrei C. r. Anelli S. Angelidakis I. Angelozzi A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony M. Antonelli d. J. A. Antrim F. Anulli M. Aoki J. A. Aparisi Pozo L. Aperio Bella G. Arabidze J. P. Araque V. Araujo Ferraz r. Araujo Pereira A. T. H. Arce r. E. Ardell F. A. Arduh J-F. Arguin S. Argyropoulos J.-H. Arling A. J. Armbruster L. J. Armitage A. Armstrong O. Arnaez H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Artz S. Asai N. Asbah E. M. Asimakopoulou L. Asquith K. Assamagan r. Astalos r. J. Atkin M. Atkinson N. B. Atlay K. Augsten G. Avolio r. Avramidou M. K. Ayoub A. M. Azoulay G. Azuelos A. E. Baas M. J. Baca H. Bachacou K. Bachas M. Backes P. Bagnaia M. Bahmani H. Bahrasemani A. J. Bailey V. r. Bailey J. T. Baines M. Bajic C. Bakalis O. K. Baker P. J. Bakker d. Bakshi Gupta S. Balaji E. M. Baldin P. Balek F. Balli W. K. Balunas J. Balz E. Banas A. Bandyopadhyay S. Banerjee A. A. E. Bannoura L. Barak W. M. Barbe E. L. Barberio d. Barberis M. Barbero T. Barillari M-S. Barisits J. Barkeloo T. Barklow r. Barnea S. L. Barnes Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan LAL Université Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Department of Physics Royal Holloway University of London Egham United Kingdom Department of Physics University of Toronto Toronto Ontario Canada Niels Bohr Institute University of Copenhagen Copenhagen Denmark Department of Physics and Astronomy University of Sussex Brighton United Kingdom 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 High Energy Physics Division Argonne National Laboratory Argonne Illinois USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics University of Tokyo Tokyo Japan Institut für Physik Universität Mainz Mainz Germany AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Department of Physics Bogazici University Istanbul Turkey Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania Departamento de Física Teorica y del Cosmos Universidad de Granada Granada (Spain) Spain Laboratório de Instrumentação e Física Experimental de Partículas—LIP Portugal Joint Institute for Nuclear Research Dubna Russia INFN Sezione di Roma Tor Vergat

This Letter presents a search for the production of a long-lived neutral particle (Zd) decaying within the ATLAS hadronic calorimeter, in association with a standard model (SM) Z boson produced via an intermediate scalar boson, where Z→ℓ+ℓ− (ℓ=e, μ). The data used were collected by the ATLAS detector during 2015 and 2016 pp collisions with a center-of-mass energy of s=13 TeV at the Large Hadron Collider and correspond to an integrated luminosity of 36.1±0.8 fb−1. No significant excess of events is observed above the expected background. Limits on the production cross section of the scalar boson times its decay branching fraction into the long-lived neutral particle are derived as a function of the mass of the intermediate scalar boson, the mass of the long-lived neutral particle, and its cτ from a few centimeters to one hundred meters. In the case that the intermediate scalar boson is the SM Higgs boson, its decay branching fraction to a long-lived neutral particle with a cτ approximately between 0.1 and 7 m is excluded with a 95% confidence level up to 10% for mZd between 5 and 15 GeV.

关键词： Particle decays Particle production Hypothetical gauge bosons Hypothetical scalars W & Z bosons Hadron colliders

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Combination of Searches for Invisible Higgs Boson decays with the ATLAS Experiment

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Physical review Letters 2019年第23期122卷 231801-231801页

作者： M. Aaboud G. Aad B. Abbott d. C. Abbott O. Abdinov A. Abed Abud d. K. Abhayasinghe S. H. Abidi O. S. AbouZeid N. L. Abraham H. Abramowicz H. Abreu Y. Abulaiti B. S. Acharya S. Adachi L. Adam C. Adam Bourdarios L. Adamczyk L. Adamek J. Adelman M. Adersberger A. Adiguzel S. Adorni T. Adye A. A. Affolder Y. Afik C. Agapopoulou M. N. Agaras A. Aggarwal C. Agheorghiesei J. A. Aguilar-Saavedra F. Ahmadov G. Aielli S. Akatsuka T. P. A. Åkesson E. Akilli A. V. Akimov K. Al Khoury G. L. Alberghi J. Albert M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa d. Alexandre T. Alexopoulos A. Alfonsi M. Alhroob B. Ali G. Alimonti J. Alison S. P. Alkire C. Allaire B. M. M. Allbrooke B. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. A. Alshehri M. I. Alstaty M. Alvarez Estevez B. Alvarez Gonzalez d. Álvarez Piqueras M. G. Alviggi Y. Amaral Coutinho A. Ambler L. Ambroz C. Amelung d. Amidei S. P. Amor dos Santos S. Amoroso C. S. Amrouche F. An C. Anastopoulos N. Andari T. Andeen C. F. Anders J. K. Anders A. Andreazza V. Andrei C. r. Anelli S. Angelidakis I. Angelozzi A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony M. Antonelli d. J. A. Antrim F. Anulli M. Aoki J. A. Aparisi Pozo L. Aperio Bella G. Arabidze J. P. Araque V. Araujo Ferraz r. Araujo Pereira A. T. H. Arce F. A. Arduh J-F. Arguin S. Argyropoulos J.-H. Arling A. J. Armbruster L. J. Armitage A. Armstrong O. Arnaez H. Arnold A. Artamonov G. Artoni S. Artz S. Asai N. Asbah E. M. Asimakopoulou L. Asquith K. Assamagan r. Astalos r. J. Atkin M. Atkinson N. B. Atlay H. Atmani K. Augsten G. Avolio r. Avramidou M. K. Ayoub A. M. Azoulay G. Azuelos A. E. Baas M. J. Baca H. Bachacou K. Bachas M. Backes F. Backman P. Bagnaia M. Bahmani H. Bahrasemani A. J. Bailey V. r. Bailey J. T. Baines M. Bajic C. Bakalis O. K. Baker P. J. Bakker d. Bakshi Gupta S. Balaji E. M. Baldin P. Balek F. Balli W. K. Balunas J. Balz E. Banas A. Bandyopadhyay Sw. Banerjee A. A. E. Bannoura L. Barak W. M. Barbe E. L. Barberio d. Barberis M. Barbero Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Department of Physics University of Massachusetts Amherst Massachusetts USA Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan INFN Sezione di Pavia Pavia Italy Dipartimento di Fisica Università di Pavia Pavia Italy Department of Physics Royal Holloway University of London Egham United Kingdom Department of Physics University of Toronto Toronto Ontario Canada Niels Bohr Institute University of Copenhagen Copenhagen Denmark Department of Physics and Astronomy University of Sussex Brighton United Kingdom 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 High Energy Physics Division Argonne National Laboratory Argonne Illinois USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics University of Tokyo Tokyo Japan Institut für Physik Universität Mainz Mainz Germany LAL Université Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Department of Physics Bogazici University Istanbul Turkey Département de Physique Nucléaire et Corpusculaire Université de Genève Genève Switzerland Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA LPC Université Clermont Auvergne CNRS/IN2P3 Clermont-Ferrand

dark matter particles, if sufficiently light, may be produced in decays of the Higgs boson. This Letter presents a statistical combination of searches for H→invisible decays where H is produced according to the standard model via vector boson fusion, Z(ℓℓ)H, and W/Z(had)H, all performed with the ATLAS detector using 36.1 fb−1 of pp collisions at a center-of-mass energy of s=13 TeV at the LHC. In combination with the results at s=7 and 8 TeV, an exclusion limit on the H→invisible branching ratio of 0.26(0.17−0.05+0.07) at 95% confidence level is observed (expected).

关键词： Extensions of Higgs sector Invisible decays Particle dark matter

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Observation of Light-by-Light Scattering in Ultraperipheral Pb+Pb Collisions with the ATLAS detector

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Physical review Letters 2019年第5期123卷 052001-052001页

作者： G. Aad B. Abbott d. C. Abbott O. Abdinov A. Abed Abud K. Abeling d. K. Abhayasinghe S. H. Abidi O. S. AbouZeid N. L. Abraham H. Abramowicz H. Abreu Y. Abulaiti B. S. Acharya B. Achkar S. Adachi L. Adam C. Adam Bourdarios L. Adamczyk L. Adamek J. Adelman M. Adersberger A. Adiguzel S. Adorni T. Adye A. A. Affolder Y. Afik C. Agapopoulou M. N. Agaras A. Aggarwal C. Agheorghiesei J. A. Aguilar-Saavedra F. Ahmadov W. S. Ahmed X. Ai G. Aielli S. Akatsuka T. P. A. Åkesson E. Akilli A. V. Akimov K. Al Khoury G. L. Alberghi J. Albert M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa d. Alexandre T. Alexopoulos A. Alfonsi M. Alhroob B. Ali G. Alimonti J. Alison S. P. Alkire C. Allaire B. M. M. Allbrooke B. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. A. Alshehri M. Alvarez Estevez d. Álvarez Piqueras M. G. Alviggi Y. Amaral Coutinho A. Ambler L. Ambroz C. Amelung d. Amidei S. P. Amor dos Santos S. Amoroso C. S. Amrouche F. An C. Anastopoulos N. Andari T. Andeen C. F. Anders J. K. Anders A. Andreazza V. Andrei C. r. Anelli S. Angelidakis A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony M. Antonelli d. J. A. Antrim F. Anulli M. Aoki J. A. Aparisi Pozo L. Aperio Bella G. Arabidze J. P. Araque V. Araujo Ferraz r. Araujo Pereira C. Arcangeletti A. T. H. Arce F. A. Arduh J-F. Arguin S. Argyropoulos J.-H. Arling A. J. Armbruster L. J. Armitage A. Armstrong O. Arnaez H. Arnold A. Artamonov G. Artoni S. Artz S. Asai N. Asbah E. M. Asimakopoulou L. Asquith K. Assamagan r. Astalos r. J. Atkin M. Atkinson N. B. Atlay H. Atmani K. Augsten G. Avolio r. Avramidou M. K. Ayoub A. M. Azoulay G. Azuelos M. J. Baca H. Bachacou K. Bachas M. Backes F. Backman P. Bagnaia M. Bahmani H. Bahrasemani A. J. Bailey V. r. Bailey J. T. Baines M. Bajic C. Bakalis O. K. Baker P. J. Bakker d. Bakshi Gupta S. Balaji E. M. Baldin P. Balek F. Balli W. K. Balunas J. Balz E. Banas A. Bandyopadhyay Sw. Banerjee A. A. E. Bannoura L. Barak W. M. Barbe E. L. Barberio d. Barberis M. Barbero T. Barillari CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Department of Physics University of Massachusetts Amherst Massachusetts USA Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan INFN Sezione di Pavia Italy Dipartimento di Fisica Università di Pavia Pavia Italy II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen Germany Department of Physics Royal Holloway University of London Egham United Kingdom Department of Physics University of Toronto Toronto Ontario Canada Niels Bohr Institute University of Copenhagen Copenhagen Denmark Department of Physics and Astronomy University of Sussex Brighton United Kingdom 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 High Energy Physics Division Argonne National Laboratory Argonne Illinois USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics University of Tokyo Tokyo Japan Institut für Physik Universität Mainz Mainz Germany LAL Université Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Department of Physics Bogazici University Istanbul Turkey Département de Physique Nucléaire et Corpusculaire Université de Genève Genève Switzerland Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA LPC Université Clermont Auvergne CNRS/IN2P3 Clermont-Ferran

This Letter describes the observation of the light-by-light scattering process, γγ→γγ, in Pb+Pb collisions at sNN=5.02 TeV. The analysis is conducted using a data sample corresponding to an integrated luminosity of 1.73 nb−1, collected in November 2018 by the ATLAS experiment at the LHC. Light-by-light scattering candidates are selected in events with two photons produced exclusively, each with transverse energy ETγ>3 GeV and pseudorapidity |ηγ|<2.4, diphoton invariant mass above 6 GeV, and small diphoton transverse momentum and acoplanarity. After applying all selection criteria, 59 candidate events are observed for a background expectation of 12±3 events. The observed excess of events over the expected background has a significance of 8.2 standard deviations. The measured fiducial cross section is 78±13(stat)±7(syst)±3(lumi) nb.

关键词： relativistic heavy-ion collisions

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HΛ3 and H‾Λ‾3 lifetime measurement in Pb–Pb collisions at s_NN=5.02 TeV via two-body decay

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Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 2019年 797卷 134905-000页

作者： Acharya, S. Adamová, d. Adhya, S.P. Adler, A. Adolfsson, J. Aggarwal, M.M. Aglieri rinella, G. Agnello, M. Agrawal, N. Ahammed, Z. Ahmad, S. Ahn, S.U. Akindinov, A. Al-Turany, M. Alam, S.N. Albuquerque, d.S.d. Aleksandrov, d. Alessandro, B. Alfanda, H.M. Alfaro Molina, r. Ali, B. Ali, Y. Alici, A. Alkin, A. Alme, J. Alt, T. Altenkamper, L. Altsybeev, I. Anaam, M.N. Andrei, C. Andreou, d. Andrews, H.A. Andronic, A. Angeletti, M. Anguelov, V. Anson, C. Antičić, T. Antinori, F. Antonioli, P. Anwar, r. Apadula, N. Aphecetche, L. Appelshäuser, H. Arcelli, S. Arnaldi, r. Arratia, M. Arsene, I.C. Arslandok, M. Augustinus, A. Averbeck, r. Aziz, S. Azmi, M.d. Badalà, A. Baek, Y.W. Bagnasco, S. Bai, X. Bailhache, r. Bala, r. Baldisseri, A. Ball, M. Balouza, S. Baral, r.C. Barbera, r. Barioglio, L. Barnaföldi, G.G. Barnby, L.S. Barret, V. Bartalini, P. Barth, K. Bartsch, E. Baruffaldi, F. Bastid, N. Basu, S. Batigne, G. Batyunya, B. Batzing, P.C. Bauri, d. Bazo Alba, J.L. Bearden, I.G. Bedda, C. Behera, N.K. Belikov, I. Bellini, F. Bellwied, r. Belyaev, V. Bencedi, G. Beole, S. Bercuci, A. Berdnikov, Y. Berenyi, d. Bertens, r.A. Berzano, d. Besoiu, M.G. Betev, L. Bhasin, A. Bhat, I.r. Bhat, M.A. Bhatt, H. Bhattacharjee, B. Bianchi, A. Bianchi, L. Bianchi, N. Bielčík, J. Bielčíková, J. Bilandzic, A. Biro, G. Biswas, r. Biswas, S. Blair, J.T. Blau, d. Blume, C. Boca, G. Bock, F. Bogdanov, A. Boldizsár, L. Bolozdynya, A. Bombara, M. Bonomi, G. Borel, H. Borissov, A. Borri, M. Bossi, H. Botta, E. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broker, T.A. Broz, M. Brucken, E.J. Bruna, E. Bruno, G.E. Buckland, M.d. Budnikov, d. Buesching, H. Bufalino, S. Bugnon, O. Buhler, P. Buncic, P. Buthelezi, Z. Butt, J.B. Buxton, J.T. Bysiak, S.A. Caffarri, d. Caliva, A. Calvo Villar, E. Camacho, r.S. Camerini, P. Capon, A.A. Carnesecchi, F. Castillo Castellanos, J. Castro, A.J. Casula, E.A.r. Catalano, F. Ceballos Sanchez, C. Chakraborty, P. Chandra, S. Chang, B. Chang, W. Chapeland, S. Chartier, M. Chattopadhyay, S. Chauvin, A. Cheshkov, C. A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation Yerevan Armenia Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Bose Institute Department of Physics Centre for Astroparticle Physics and Space Science (CAPSS) Kolkata India Budker Institute for Nuclear Physics Novosibirsk Russian Federation California Polytechnic State University San Luis Obispo CA United States Central China Normal University Wuhan China Centre de Calcul de l'IN2P3 Villeurbanne Lyon France Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN) Havana Cuba Centro de Investigación y de Estudios Avanzados (CINVESTAV) Mexico City and Mérida Mexico Centro Fermi – Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi” Rome Italy Chicago State University Chicago IL United States China Institute of Atomic Energy Beijing China Chonbuk National University Jeonju South Korea Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia COMSATS University Islamabad Islamabad Pakistan Creighton University Omaha NE United States Department of Physics Aligarh Muslim University Aligarh India Department of Physics Pusan National University Pusan South Korea Department of Physics Sejong University Seoul South Korea Department of Physics University of California Berkeley CA United States Department of Physics University of Oslo Oslo Norway Department of Physics and Technology University of Bergen Bergen Norway Dipartimento di Fisica dell'Università ‘La Sapienza’ Sezione INFN Rome Italy Dipartimento di Fisica dell'Università Sezione INFN Cagliari Italy Dipartimento di Fisica dell'Università Sezione INFN Trieste Italy Dipartimento di Fisica dell'Università Sezione INFN Turin Italy Dipartimento di Fisica e Astronomia dell'Università Sezione INFN Bologna Italy Dipartimento di Fisica e Astronomia dell'Università Sezione INFN Catania Italy Dipartimento

An improved value for the lifetime of the (anti-)hypertriton has been obtained using the data sample of Pb–Pb collisions at sNN=5.02 TeV collected by the ALICE experiment at the LHC. The (anti-)hypertriton has been r...

An improved value for the lifetime of the (anti-)hypertriton has been obtained using the data sample of Pb–Pb collisions at s_NN=5.02 TeV collected by the ALICE experiment at the LHC. The (anti-)hypertriton has been reconstructed via its charged two-body mesonic decay channel and the lifetime has been determined from an exponential fit to the dN/d(ct) spectrum. The measured value, τ=242₋₃₈ ⁺³⁴ (stat.) ± 17 (syst.) ps, is compatible with representative theoretical predictions, thus contributing to the solution of the longstanding hypertriton lifetime puzzle. © 2019 The Author

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All-sky search for long-duration gravitational-wave transients in the second Advanced LIGO observing run

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Physical review d 2019年第10期99卷 104033-104033页

作者： B. P. Abbott r. Abbott T. d. Abbott S. Abraham F. Acernese K. Ackley C. Adams r. X. Adhikari V. B. Adya C. Affeldt M. Agathos K. Agatsuma N. Aggarwal O. d. Aguiar L. Aiello A. Ain P. Ajith G. Allen A. Allocca M. A. Aloy P. A. Altin A. Amato S. Anand A. Ananyeva S. B. Anderson W. G. Anderson S. V. Angelova S. Antier S. Appert K. Arai M. C. Araya J. S. Areeda M. Arène N. Arnaud S. M. Aronson S. Ascenzi G. Ashton S. M. Aston P. Astone F. Aubin P. Aufmuth K. AultONeal C. Austin V. Avendano A. Avila-Alvarez S. Babak P. Bacon F. Badaracco M. K. M. Bader S. Bae J. Baird P. T. Baker F. Baldaccini G. Ballardin S. W. Ballmer A. Bals S. Banagiri J. C. Barayoga C. Barbieri S. E. Barclay B. C. Barish d. Barker K. Barkett S. Barnum F. Barone B. Barr L. Barsotti M. Barsuglia d. Barta J. Bartlett I. Bartos r. Bassiri A. Basti M. Bawaj J. C. Bayley M. Bazzan B. Bécsy M. Bejger I. Belahcene A. S. Bell d. Beniwal M. G. Benjamin B. K. Berger G. Bergmann S. Bernuzzi C. P. L. Berry d. Bersanetti A. Bertolini J. Betzwieser r. Bhandare J. Bidler E. Biggs I. A. Bilenko S. A. Bilgili G. Billingsley r. Birney O. Birnholtz S. Biscans M. Bischi S. Biscoveanu A. Bisht M. Bitossi M. A. Bizouard J. K. Blackburn J. Blackman C. d. Blair d. G. Blair r. M. Blair S. Bloemen F. Bobba N. Bode M. Boer Y. Boetzel G. Bogaert F. Bondu r. Bonnand P. Booker B. A. Boom r. Bork V. Boschi S. Bose V. Bossilkov J. Bosveld Y. Bouffanais A. Bozzi C. Bradaschia P. r. Brady A. Bramley M. Branchesi J. E. Brau M. Breschi T. Briant J. H. Briggs F. Brighenti A. Brillet M. Brinkmann P. Brockill A. F. Brooks J. Brooks d. d. Brown S. Brunett A. Buikema T. Bulik H. J. Bulten A. Buonanno d. Buskulic C. Buy r. L. Byer M. Cabero L. Cadonati G. Cagnoli C. Cahillane J. Calderón Bustillo T. A. Callister E. Calloni J. B. Camp W. A. Campbell K. C. Cannon H. Cao J. Cao G. Carapella F. Carbognani S. Caride M. F. Carney G. Carullo J. Casanueva diaz C. Casentini S. Caudill M. Cavaglià F. Cavalier r. Cavalieri G. Cella P. Cerdá-durán E. Cesarini O. Chaibi K. Chakravarti S. J. Chamberlin LIGO California Institute of Technology Pasadena California 91125 USA Louisiana State University Baton Rouge Louisiana 70803 USA Inter-University Centre for Astronomy and Astrophysics Pune 411007 India Dipartimento di Farmacia Università di Salerno I-84084 Fisciano Salerno Italy INFN Sezione di Napoli Complesso Universitario di Monte Sant’Angelo I-80126 Napoli Italy OzGrav School of Physics & Astronomy Monash University Clayton 3800 Victoria Australia LIGO Livingston Observatory Livingston Louisiana 70754 USA OzGrav Australian National University Canberra Australian Capital Territory 0200 Australia Max Planck Institute for Gravitational Physics (Albert Einstein Institute) D-30167 Hannover Germany Leibniz Universität Hannover D-30167 Hannover Germany Theoretisch-Physikalisches Institut Friedrich-Schiller-Universität Jena D-07743 Jena Germany University of Cambridge Cambridge CB2 1TN United Kingdom University of Birmingham Birmingham B15 2TT United Kingdom LIGO Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Instituto Nacional de Pesquisas Espaciais 12227-010 São José dos Campos São Paulo Brazil Gran Sasso Science Institute (GSSI) I-67100 L’Aquila Italy INFN Laboratori Nazionali del Gran Sasso I-67100 Assergi Italy International Centre for Theoretical Sciences Tata Institute of Fundamental Research Bengaluru 560089 India NCSA University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Università di Pisa I-56127 Pisa Italy INFN Sezione di Pisa I-56127 Pisa Italy Departamento de Astronomía y Astrofísica Universitat de València E-46100 Burjassot València Spain Laboratoire des Matériaux Avancés (LMA) CNRS/IN2P3 F-69622 Villeurbanne France University of Wisconsin-Milwaukee Milwaukee Wisconsin 53201 USA SUPA University of Strathclyde Glasgow G1 1XQ United Kingdom APC AstroParticule et Cosmologie Université Paris Diderot CNRS/IN2P3 CEA/Irfu Observatoire de Paris Sorbonne Paris Cité F-75205 Paris Cedex 13 F

We present the results of a search for long-duration gravitational-wave transients in the data from the Advanced LIGO second observation run; we search for gravitational-wave transients of 2–500 s duration in the 24–2048 Hz frequency band with minimal assumptions about signal properties such as waveform morphologies, polarization, sky location or time of occurrence. Signal families covered by these search algorithms include fallback accretion onto neutron stars, broadband chirps from innermost stable circular orbit waves around rotating black holes, eccentric inspiral-merger-ringdown compact binary coalescence waveforms, and other models. The second observation run totals about 118.3 days of coincident data between November 2016 and August 2017. We find no significant events within the parameter space that we searched, apart from the already-reported binary neutron star merger GW170817. We thus report sensitivity limits on the root-sum-square strain amplitude hrss at 50% efficiency. These sensitivity estimates are an improvement relative to the first observing run and also done with an enlarged set of gravitational-wave transient waveforms. Overall, the best search sensitivity is hrss50%=2.7×10−22 Hz−1/2 for a millisecond magnetar model. For eccentric compact binary coalescence signals, the search sensitivity reaches hrss50%=9.6×10−22 Hz−1/2.

关键词： Gravitational waves

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All-sky search for short gravitational-wave bursts in the second Advanced LIGO and Advanced Virgo run

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Physical review d 2019年第2期100卷 024017-024017页

作者： B. P. Abbott r. Abbott T. d. Abbott S. Abraham F. Acernese K. Ackley C. Adams r. X. Adhikari V. B. Adya C. Affeldt M. Agathos K. Agatsuma N. Aggarwal O. d. Aguiar L. Aiello A. Ain P. Ajith G. Allen A. Allocca M. A. Aloy P. A. Altin A. Amato S. Anand A. Ananyeva S. B. Anderson W. G. Anderson S. V. Angelova S. Antier S. Appert K. Arai M. C. Araya J. S. Areeda M. Arène N. Arnaud S. M. Aronson S. Ascenzi G. Ashton S. M. Aston P. Astone F. Aubin P. Aufmuth K. AultONeal C. Austin V. Avendano A. Avila-Alvarez S. Babak P. Bacon F. Badaracco M. K. M. Bader S. Bae J. Baird P. T. Baker F. Baldaccini G. Ballardin S. W. Ballmer A. Bals S. Banagiri J. C. Barayoga C. Barbieri S. E. Barclay B. C. Barish d. Barker K. Barkett S. Barnum F. Barone B. Barr L. Barsotti M. Barsuglia d. Barta J. Bartlett I. Bartos r. Bassiri A. Basti M. Bawaj J. C. Bayley M. Bazzan B. Bécsy M. Bejger I. Belahcene A. S. Bell d. Beniwal M. G. Benjamin B. K. Berger G. Bergmann S. Bernuzzi C. P. L. Berry d. Bersanetti A. Bertolini J. Betzwieser r. Bhandare J. Bidler E. Biggs I. A. Bilenko S. A. Bilgili G. Billingsley r. Birney O. Birnholtz S. Biscans M. Bischi S. Biscoveanu A. Bisht M. Bitossi M. A. Bizouard J. K. Blackburn J. Blackman C. d. Blair d. G. Blair r. M. Blair S. Bloemen F. Bobba N. Bode M. Boer Y. Boetzel G. Bogaert F. Bondu r. Bonnand P. Booker B. A. Boom r. Bork V. Boschi S. Bose V. Bossilkov J. Bosveld Y. Bouffanais A. Bozzi C. Bradaschia P. r. Brady A. Bramley M. Branchesi J. E. Brau M. Breschi T. Briant J. H. Briggs F. Brighenti A. Brillet M. Brinkmann P. Brockill A. F. Brooks J. Brooks d. d. Brown S. Brunett A. Buikema T. Bulik H. J. Bulten A. Buonanno d. Buskulic C. Buy r. L. Byer M. Cabero L. Cadonati G. Cagnoli C. Cahillane J. Calderón Bustillo T. A. Callister E. Calloni J. B. Camp W. A. Campbell M. Canepa K. C. Cannon H. Cao J. Cao G. Carapella F. Carbognani S. Caride M. F. Carney G. Carullo J. Casanueva diaz C. Casentini S. Caudill M. Cavaglià F. Cavalier r. Cavalieri G. Cella P. Cerdá-durán E. Cesarini O. Chaibi K. Chakravarti S. J. LIGO California Institute of Technology Pasadena California 91125 USA Louisiana State University Baton Rouge Louisiana 70803 USA Inter-University Centre for Astronomy and Astrophysics Pune 411007 India Dipartimento di Farmacia Università di Salerno I-84084 Fisciano Salerno Italy INFN Sezione di Napoli Complesso Universitario di Monte S.Angelo I-80126 Napoli Italy OzGrav School of Physics & Astronomy Monash University Clayton 3800 Victoria Australia LIGO Livingston Observatory Livingston Louisiana 70754 USA OzGrav Australian National University Canberra Australian Capital Territory 0200 Australia Max Planck Institute for Gravitational Physics (Albert Einstein Institute) D-30167 Hannover Germany Leibniz Universität Hannover D-30167 Hannover Germany Theoretisch-Physikalisches Institut Friedrich-Schiller-Universität Jena D-07743 Jena Germany University of Cambridge Cambridge CB2 1TN United Kingdom University of Birmingham Birmingham B15 2TT United Kingdom LIGO Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Instituto Nacional de Pesquisas Espaciais 12227-010 São José dos Campos São Paulo Brazil Gran Sasso Science Institute (GSSI) I-67100 L’Aquila Italy INFN Laboratori Nazionali del Gran Sasso I-67100 Assergi Italy International Centre for Theoretical Sciences Tata Institute of Fundamental Research Bengaluru 560089 India NCSA University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Università di Pisa I-56127 Pisa Italy INFN Sezione di Pisa I-56127 Pisa Italy Departamento de Astronomía y Astrofísica Universitat de València E-46100 Burjassot València Spain Laboratoire des Matériaux Avancés (LMA) CNRS/IN2P3 F-69622 Villeurbanne France University of Wisconsin-Milwaukee Milwaukee Wisconsin 53201 USA SUPA University of Strathclyde Glasgow G1 1XQ United Kingdom APC AstroParticule et Cosmologie Université Paris Diderot CNRS/IN2P3 CEA/Irfu Observatoire de Paris Sorbonne Paris Cité F-75205 Paris Cedex 13 Fran

We present the results of a search for short-duration gravitational-wave transients in the data from the second observing run of Advanced LIGO and Advanced Virgo. We search for gravitational-wave transients with a duration of milliseconds to approximately one second in the 32–4096 Hz frequency band with minimal assumptions about the signal properties, thus targeting a wide variety of sources. We also perform a matched-filter search for gravitational-wave transients from cosmic string cusps for which the waveform is well modeled. The unmodeled search detected gravitational waves from several binary black hole mergers which have been identified by previous analyses. No other significant events have been found by either the unmodeled search or the cosmic string search. We thus present the search sensitivities for a variety of signal waveforms and report upper limits on the source rate density as a function of the characteristic frequency of the signal. These upper limits are a factor of 3 lower than the first observing run, with a 50% detection probability for gravitational-wave emissions with energies of ∼10−9 M⊙c2 at 153 Hz. For the search dedicated to cosmic string cusps we consider several loop distribution models, and present updated constraints from the same search done in the first observing run.

关键词： Gravitational wave detection Gravitational waves Gravitational wave detectors

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Search for gravitational waves from Scorpius X-1 in the second Advanced LIGO observing run with an improved hidden Markov model

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Physical review d 2019年第12期100卷 122002-122002页

作者： B. P. Abbott r. Abbott T. d. Abbott S. Abraham F. Acernese K. Ackley C. Adams r. X. Adhikari V. B. Adya C. Affeldt M. Agathos K. Agatsuma N. Aggarwal O. d. Aguiar L. Aiello A. Ain P. Ajith G. Allen A. Allocca M. A. Aloy P. A. Altin A. Amato A. Ananyeva S. B. Anderson W. G. Anderson S. V. Angelova S. Antier S. Appert K. Arai M. C. Araya J. S. Areeda M. Arène N. Arnaud S. Ascenzi G. Ashton S. M. Aston P. Astone F. Aubin P. Aufmuth K. AultONeal C. Austin V. Avendano A. Avila-Alvarez S. Babak P. Bacon F. Badaracco M. K. M. Bader S. Bae P. T. Baker F. Baldaccini G. Ballardin S. W. Ballmer S. Banagiri J. C. Barayoga S. E. Barclay B. C. Barish d. Barker K. Barkett S. Barnum F. Barone B. Barr L. Barsotti M. Barsuglia d. Barta J. Bartlett I. Bartos r. Bassiri A. Basti M. Bawaj J. C. Bayley M. Bazzan B. Bécsy M. Bejger I. Belahcene A. S. Bell d. Beniwal B. K. Berger G. Bergmann S. Bernuzzi J. J. Bero C. P. L. Berry d. Bersanetti A. Bertolini J. Betzwieser r. Bhandare J. Bidler I. A. Bilenko S. A. Bilgili G. Billingsley J. Birch r. Birney O. Birnholtz S. Biscans S. Biscoveanu A. Bisht M. Bitossi M. A. Bizouard J. K. Blackburn C. d. Blair d. G. Blair r. M. Blair S. Bloemen N. Bode M. Boer Y. Boetzel G. Bogaert F. Bondu E. Bonilla r. Bonnand P. Booker B. A. Boom C. d. Booth r. Bork V. Boschi S. Bose K. Bossie V. Bossilkov J. Bosveld Y. Bouffanais A. Bozzi C. Bradaschia P. r. Brady A. Bramley M. Branchesi J. E. Brau T. Briant J. H. Briggs F. Brighenti A. Brillet M. Brinkmann V. Brisson P. Brockill A. F. Brooks d. d. Brown S. Brunett A. Buikema T. Bulik H. J. Bulten A. Buonanno d. Buskulic C. Buy r. L. Byer M. Cabero L. Cadonati G. Cagnoli C. Cahillane J. Calderón Bustillo T. A. Callister E. Calloni J. B. Camp W. A. Campbell M. Canepa K. C. Cannon H. Cao J. Cao E. Capocasa F. Carbognani S. Caride M. F. Carney G. Carullo J. Casanueva diaz C. Casentini S. Caudill M. Cavaglià F. Cavalier r. Cavalieri G. Cella P. Cerdá-durán G. Cerretani E. Cesarini O. Chaibi K. Chakravarti S. J. Chamberlin M. Chan S. Chao P. Charlton E. A. Chase E LIGO California Institute of Technology Pasadena California 91125 USA Louisiana State University Baton Rouge Louisiana 70803 USA Inter-University Centre for Astronomy and Astrophysics Pune 411007 India Università di Salerno Fisciano I-84084 Salerno Italy INFN Sezione di Napoli Complesso Universitario di Monte S. Angelo I-80126 Napoli Italy OzGrav School of Physics & Astronomy Monash University Clayton 3800 Victoria Australia LIGO Livingston Observatory Livingston Louisiana 70754 USA Max Planck Institute for Gravitational Physics (Albert Einstein Institute) D-30167 Hannover Germany Leibniz Universität Hannover D-30167 Hannover Germany University of Cambridge Cambridge CB2 1TN United Kingdom University of Birmingham Birmingham B15 2TT United Kingdom LIGO Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Instituto Nacional de Pesquisas Espaciais 12227-010 São José dos Campos São Paulo Brazil Gran Sasso Science Institute (GSSI) I-67100 L’Aquila Italy INFN Laboratori Nazionali del Gran Sasso I-67100 Assergi Italy International Centre for Theoretical Sciences Tata Institute of Fundamental Research Bengaluru 560089 India NCSA University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Università di Pisa I-56127 Pisa Italy INFN Sezione di Pisa I-56127 Pisa Italy Departamento de Astronomía y Astrofísica Universitat de València E-46100 Burjassot València Spain OzGrav Australian National University Canberra Australian Capital Territory 0200 Australia Laboratoire des Matériaux Avancés (LMA) CNRS/IN2P3 F-69622 Villeurbanne France University of Wisconsin-Milwaukee Milwaukee Wisconsin 53201 USA SUPA University of Strathclyde Glasgow G1 1XQ United Kingdom LAL Universite Paris-Sud CNRS/IN2P3 Université Paris-Saclay F-91898 Orsay France California State University Fullerton Fullerton California 92831 USA APC AstroParticule et Cosmologie Université Paris Diderot CNRS/IN2P3 CEA/Irfu Observatoire de Paris Sorbonne Par

We present results from a semicoherent search for continuous gravitational waves from the low-mass x-ray binary Scorpius X-1, using a hidden Markov model (HMM) to track spin wandering. This search improves on previous HMM-based searches of LIGO data by using an improved frequency domain matched filter, the J-statistic, and by analyzing data from Advanced LIGO’s second observing run. In the frequency range searched, from 60 to 650 Hz, we find no evidence of gravitational radiation. At 194.6 Hz, the most sensitive search frequency, we report an upper limit on gravitational wave strain (at 95% confidence) of h095%=3.47×10−25 when marginalizing over source inclination angle. This is the most sensitive search for Scorpius X-1, to date, that is specifically designed to be robust in the presence of spin wandering.

关键词： Gravitational waves

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