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arXiv 2018年

作者： Wang, Ke Elahi, Mirza M. Habib, K.M. Masum Taniguchi, Takashi Watanabe, Kenji Ghosh, Avik W. Lee, Gil-Ho Kim, Philip Department of Physics Harvard University CambridgeMA02138 United States School of Physics and Astronomy University of Minnesota MinneapolisMN55455 United States Department of Electrical and Computer Engineering University of Virginia CharlottesvilleVA22904 United States National Institute for Materials Science Namiki 1-1 Tsukuba Ibaraki305-0044 Japan Department of Physics University of Virginia CharlottesvilleVA22904 United States Department of Physics Pohang University of Science and Technology Pohang37673 Korea Republic of

The linear energy-momentum dispersion, coupled with pseudo-spinors (1), makes graphene an ideal solid-state material platform to realize an electronic device based on Dirac-Fermionic relativistic quantum mechanics. Employing local gate control, several examples of electronic devices based on Dirac fermion dynamics have been demonstrated, including Klein tunneling (2), negative refraction (3-5) and specular Andreev reflection (6, 7). In this work, we present a quantum switch based on analogous Dirac-fermion-optics (DFO), in which the angle dependence of Klein tunneling is explicitly utilized to build tunable collimators and reflectors for the quantum wave function of Dirac fermions. We employ a novel dual-source design with a single flat reflector, which minimizes diffusive edge scattering and suppresses the background incoherent transmission. Our gate-tunable collimator-reflector device design enables measurement of the net DFO contribution in the switching device operation. We measure a full set of transmission coefficients of DFO wavefunction between multiple leads of the device, separating the classical contribution from that of any disorder in the channel. Since the DFO quantum switch demonstrated in this work requires no explicit energy gap, the switching operation is expected to be robust against thermal fluctuations and inhomogeneity length scales comparable to the Fermi Copyright © 2018, The Authors. All rights reserved.

关键词： Reflection

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Where Does AlphaGo Go: From Church-Turing Thesis to AlphaGo Thesis and Beyond

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IEEE/CAA Journal of Automatica Sinica 2016年第2期3卷 113-120页

作者： Fei-Yue Wang Jun Jason Zhang Xinhu Zheng Xiao Wang Yong Yuan Xiaoxiao Dai Jie Zhang Liuqing Yang IEEE the State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences (SKL-MCCS CASIA) Research Center of Computational Experiments and Parallel Systems The National University of Defense Technology the Department of Electrical and Computer Engineering Ritchie School of Engineering and Computer Science University of Denver the Department of Computer Science and Engineering University of Minnesota the Qingdao Academy of Intelligent Industries (QAII) Qingdao Shandong China and SKL-MCCS CASIA the Department of Electrical and Computer Engineering Colorado State University

An investigation on the impact and significance of the AlphaGo vs. Lee Sedol Go match is conducted, and concludes with a conjecture of the AlphaGo Thesis and its extension in accordance with the Church-Turing Thesis in the history of computing. It is postulated that the architecture and method utilized by the AlphaGo program provide an engineering solution for tackling issues in complexity and intelligence. Specifically, the AlphaGo Thesis implies that any effective procedure for hard decision problems such as NP-hard can be implemented with AlphaGo-like approach. Deep rule-based networks are proposed in attempt to establish an understandable structure for deep neural networks in deep learning. The success of AlphaGo and corresponding thesis ensure the technical soundness of the parallel intelligence approach for intelligent control and management of complex systems and knowledge automation. © 2014 Chinese Association of Automation.

关键词： Religious buildings

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GRANDMA Observations of ZTF/Fink Transients during Summer 2021

arXiv

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arXiv 2022年

作者： Aivazyan, V. Almualla, M. Antier, Sarah Baransky, A. Barynova, K. Basa, S. Bayard, F. Beradze, S. Berezin, D. Blazek, M. Boutigny, D. Boust, D. Broens, E. Burkhonov, O. Cailleau, A. Christensen, N. Cejudo, D. Coleiro, A. Coughlin, M.W. Datashvili, D. Dietrich, T. Dolon, F. Ducoin, J.-G. Duverne, P.-A. Marchal-Duval, G. Galdies, C. Granier, L. Godunova, V. Gokuldass, P. Eggenstein, H.B. Freeberg, M. Hello, P. Inasaridze, R. Ishida, E.E.O. Jaquiery, P. Kann, D.A. Kapanadze, G. Karpov, S. Kiendrebeogo, R.W. Klotz, A. Kneip, R. Kochiashvili, N. Kou, W. Kugel, F. Lachaud, C. Leonini, S. Leroy, A. Leroy, N. Le Van Su, A. Marchais, D. Mašek, M. Midavaine, T. Möller, A. Morris, D. Natsvlishvili, R. Navarete, F. Noysena, K. Nissanke, S. Noonan, K. Orange, N.B. Peloton, J. Popowicz, A. Pradier, T. Prouza, M. Raaijmakers, G. Rajabov, Y. Richmond, M. Romanyuk, Ya. Rousselot, L. Sadibekova, T. Serrau, M. Sokoliuk, O. Song, X. Simon, A. Stachie, C. Taylor, A. Tillayev, Y. Turpin, D. Vardosanidze, M. Vlieghe, J. Tosta e Melo, I. Wang, X.F. Zhu, J. E. Kharadze Georgian National Astrophysical Observatory Mt.Kanobili Abastumani Adigeni0301 Georgia Ilia State University Kakutsa Cholokashvili ave 3/5 Tbilisi0162 Georgia Samtskhe-Javakheti State University Rustaveli Str. 113 Akhaltsikhe0080 Georgia American University of Sharjah Physics Department PO Box 26666 Sharjah United Arab Emirates Artemis Observatoire de la Côte d'Azur Université Côte d'Azur Boulevard de l'Observatoire Nice06304 France GRAPPA Anton Pannekoek Institute for Astronomy Institute of High-Energy Physics University of Amsterdam Science Park 904 Amsterdam1098 XH Netherlands Université de Paris CNRS Astroparticule et Cosmologie ParisF-75013 France Astronomical Observatory Taras Shevshenko National University of Kyiv Observatorna str. 3 Kyiv04053 Ukraine University of Iceland Sæmundargata 2 Reykjavík102 Iceland Aix Marseille Univ CNRS CNES LAM IPhU Marseille France Société Astronomique de Lyon 9 Avenue Charles André Saint Genis Laval France ICAMER Observatory of NAS of Ukraine 27 Acad. Zabolotnoho Str. Kyiv03143 Ukraine Glorieta de la Astronomía s/n Granada18008 Spain Université Grenoble-Alpes Université Savoie Mont Blanc CNRS IN2P3 Laboratoire d'Annecy-le-Vieux de Physique des Particules France Observatoire de Dauban Banon04 France Groupe Astronomique de Querqueville 61 rue Roger Glinel Cherbourg en Cotentin 50460 France Vereniging Voor Sterrenkunde Balen-Neetlaan 18A MolB-2400 Belgium Zeeweg 96 BruggeB-8200 Belgium Ulugh Beg Astronomical Institute Uzbekistan Academy of Sciences Astronomy str. 33 Tashkent100052 Uzbekistan MP-G2A Midi Pyrénées Groud Astrophysic Addict Cuq81570 France El Center for Backyard Astrophysics Spain School of Physics and Astronomy University of Minnesota MinneapolisMN55455 United States Institute for Physics and Astronomy University of Potsdam PotsdamD-14476 Germany Am Mühlenberg 1 D-14476 Germany OHP Observatoire de Haute-Provence CNRS Aix Marseille University In

We present our follow-up observations with GRANDMA of transient sources revealed by the Zwicky Transient Facility (ZTF). Over a period of six months, from 1 April to 30 September 2021, all ZTF triggers were examined in real time by a dedicated science module implemented in the Fink broker, which will be used for the data processing of the Vera C. Rubin Observatory. In this article, we present three selection methods to identify promising kilonova candidates. Out of more than 35 million candidates, a hundred sources have passed our selection criteria. Six were then followed-up by GRANDMA (by both professional and amateur astronomers). The majority were finally classified either as asteroids or as supernovae events. We then demonstrate the added value of a substantial follow-up campaign of optical transients. We mobilized 37 telescopes, bringing together a large sample of images, taken under various conditions and quality. To complement the orphan kilonova candidates (those without associated gamma-ray bursts, which were all), we included three additional supernovae alerts to conduct further observations of during summer 2021. We demonstrate the importance of the amateur astronomer community that contributed from one to 23 images within the first two days after the Fink alert for scientific analyzes of new sources discovered in a magnitude range r' = 17 − 19 mag. We based our rapid kilonova classification on the decay rate of the optical source that should exceed 0.3 mag/day. GRANDMA's follow-up determined the fading rate within 1.5 ± 1.2 days post-discovery, without waiting for further observations from ZTF. No confirmed kilonovae were discovered during our observing campaign. This work will be continued in the coming months in the view of preparing for kilonova searches in the next gravitational-wave observing run O4 and the commissioning of the Vera C. Rubin Observatory. © 2022, CC BY-SA.

关键词： Gravity waves

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Strong-field gravity tests with the double pulsar

arXiv

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arXiv 2021年

作者： Kramer, Michael Stairs, I.H. Manchester, R.N. Wex, N. Deller, A.T. Coles, W.A. Ali, M. Burgay, M. Camilo, F. Cognard, I. Damour, T. Desvignes, G. Ferdman, R.D. Freire, P.C.C. Grondin, S. Guillemot, L. Hobbs, G.B. Janssen, G. Karuppusamy, R. Lorimer, D.R. Lyne, A.G. McKee, J.W. McLaughlin, M. Münch, L.E. Perera, B.B.P. Pol, N. Possenti, A. Sarkissian, J. Stappers, B.W. Theureau, G. Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 BonnD-53121 Germany Jodrell Bank Centre for Astrophysics The University of Manchester M13 9PL United Kingdom Department of Physics and Astronomy University of British Columbia 6224 Agricultural Road VancouverBCV6T 1Z1 Canada Australia Telescope National Facility CSIRO Space and Astronomy P.O. Box 76 EppingNSW1710 Australia Centre for Astrophysics and Supercomputing Swinburne University of Technology P.O. Box 218 HawthornVIC3122 Australia Australia Electrical and Computer Engineering University of California La Jolla San DiegoCA92093 United States Perimeter Institute for Theoretical Physics 31 Caroline Street North WaterlooONN2L 2Y5 Canada INAF - Osservatorio Astronomico di Cagliari Via della Scienza 5 CA Selargius09047 Italy South African Radio Astronomy Observatory 2 Fir Street Black River Park Observatory 7925 South Africa Laboratoire de Physique et Chimie de l'Environnement et de l'Espace LPC2E CNRS-Université d'Orléans OrléansF-45071 France Station de Radioastronomie de Nançay Observatoire de Paris CNRS/INSU Nançay F-18330 France Institut des Hautes Études Scientifiques Bures-sur-Yvette 91440 France LESIA Observatoire de Paris Université PSL CNRS Sorbonne Université Université de Paris 5 Place Jules Janssen Meudon92195 France Faculty of Science University of East Anglia NorwichNR4 7TJ United Kingdom David A. Dunlap Department of Astronomy & Astrophysics University of Toronto 50 St. George Street TorontoONM5S 3H4 Canada ASTRON Netherlands Institute for Radio Astronomy Oude Hoogeveensedijk 4 Dwingeloo7991 PD Netherlands Department of Astrophysics IMAPP Radboud University P.O. Box 9010 Nijmegen6500 GL Netherlands Department of Physics and Astronomy West Virginia University P.O. Box 6315 MorgantownWV26506 United States Canadian Institute for Theoretical Astrophysics University of Toronto 60 St. George Street TorontoONM5S 3H8 Canada Arecibo Observatory Univ

Continued timing observations of the Double Pulsar, PSR J0737-3039A/B, which consists of two active radio pulsars (A and B) that orbit each other with a period of 2.45 hr in a mildly eccentric (e = 0.088) binary system, have led to large improvements in the measurement of relativistic effects in this system. With a 16-yr data span, the results enable precision tests of theories of gravity for strongly self-gravitating bodies and also reveal new relativistic effects that have been expected but are now observed for the first time. These include effects of light propagation in strong gravitational fields which are currently not testable by any other method. In particular, we observe the effects of retardation and aberrational light-bending that allow determination of the spin direction of the pulsar. In total, we have detected seven post-Keplerian parameters in this system, more than for any other known binary pulsar. For some of these effects, the measurement precision is now so high that for the first time we have to take higher-order contributions into account. These include the contribution of the A pulsar's effective mass loss (due to spin-down) to the observed orbital period decay, a relativistic deformation of the orbit, and the effects of the equation of state of super-dense matter on the observed post-Keplerian parameters via relativistic spin-orbit coupling. We discuss the implications of our findings, including those for the moment of inertia of neutron stars, and present the currently most precise test of general relativity's quadrupolar description of gravitational waves, validating the prediction of general relativity at a level of 1.3 × 10-4 with 95% confidence. We demonstrate the utility of the Double Pulsar for tests of alternative theories of gravity by focusing on two specific examples and also discuss some implications of the observations for studies of the interstellar medium and models for the formation of the Double Pulsar system. Finally, we pro

关键词： Pulsars

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Search for a Narrow Resonance Lighter than 200 GeV Decaying to a Pair of Muons in Proton-Proton Collisions at s=13 TeV

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Physical Review Letters 2020年第13期124卷 131802-131802页

作者： A. M. Sirunyan A. Tumasyan W. Adam F. Ambrogi T. Bergauer M. Dragicevic J. Erö A. Escalante Del Valle M. Flechl R. Frühwirth M. Jeitler N. Krammer I. Krätschmer D. Liko T. Madlener I. Mikulec N. Rad J. Schieck R. Schöfbeck M. Spanring D. Spitzbart W. Waltenberger C.-E. Wulz M. Zarucki V. Drugakov V. Mossolov J. Suarez Gonzalez M. R. Darwish E. A. De Wolf D. Di Croce X. Janssen A. Lelek M. Pieters H. Rejeb Sfar H. Van Haevermaet P. Van Mechelen S. Van Putte N. Van Remortel F. Blekman E. S. Bols S. S. Chhibra J. D’Hondt J. De Clercq D. Lontkovskyi S. Lowette I. Marchesini S. Moortgat Q. Python K. Skovpen S. Tavernier W. Van Doninck P. Van Mulders D. Beghin B. Bilin B. Clerbaux G. De Lentdecker H. Delannoy B. Dorney L. Favart A. Grebenyuk A. K. Kalsi A. Popov N. Postiau E. Starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom T. Cornelis D. Dobur I. Khvastunov M. Niedziela C. Roskas M. Tytgat W. Verbeke B. Vermassen M. Vit O. Bondu G. Bruno C. Caputo P. David C. Delaere M. Delcourt A. Giammanco V. Lemaitre J. Prisciandaro A. Saggio M. Vidal Marono P. Vischia J. Zobec F. L. Alves G. A. Alves G. Correia Silva C. Hensel A. Moraes P. Rebello Teles E. Belchior Batista Das Chagas W. Carvalho J. Chinellato E. Coelho E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao C. De Oliveira Martins S. Fonseca De Souza L. M. Huertas Guativa H. Malbouisson J. Martins D. Matos Figueiredo M. Medina Jaime M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima W. L. Prado Da Silva L. J. Sanchez Rosas A. Santoro A. Sznajder M. Thiel E. J. Tonelli Manganote F. Torres Da Silva De Araujo A. Vilela Pereira C. A. Bernardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores D. S. Lemos P. G. Mercadante S. F. Novaes Sandra S. Padula A. Aleksandrov G. Antchev R. Hadjiiska P. Iaydjiev M. Misheva M. Rodozov M. Shopova G. Sultanov M. Bonchev A. Dimitrov T. Ivanov L. Litov B. Pavlov P. Petkov W. Fang X. Gao L. Yuan M. Ahmad Z. Hu Y. Wang G. M. Chen H. S. Chen M. Chen C. H. Jiang D. Leggat H. Liao Z. Liu A. Spiezia J. Tao E. Yazgan H. Zhang Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista São Paulo Brazil Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China National Centre for Physics Quaid-I-Azam University Islamabad Pakistan Department of Physics Tsinghua University Beijing China University of Virginia Charlottesville Virginia USA Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China The University of Kansas Lawrence Kansas USA Zhejiang University Hangzhou China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Un

A search is presented for a narrow resonance decaying to a pair of oppositely charged muons using s=13 TeV proton-proton collision data recorded at the LHC. In the 45–75 and 110–200 GeV resonance mass ranges, the search is based on conventional triggering and event reconstruction techniques. In the 11.5–45 GeV mass range, the search uses data collected with dimuon triggers with low transverse momentum thresholds, recorded at high rate by storing a reduced amount of trigger-level information. The data correspond to integrated luminosities of 137 and 96.6 fb−1 for conventional and high-rate triggering, respectively. No significant resonant peaks are observed in the probed mass ranges. The search sets the most stringent constraints to date on a dark photon in the ∼30–75 and 110–200 GeV mass ranges.

关键词： Hypothetical gauge bosons Muons Hadron colliders

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Constraints on the χc1 versus χc2 Polarizations in Proton-Proton Collisions at s=8 TeV

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Physical Review Letters 2020年第16期124卷 162002-162002页

作者： A. M. Sirunyan A. Tumasyan W. Adam F. Ambrogi T. Bergauer M. Dragicevic J. Erö A. Escalante Del Valle M. Flechl R. Frühwirth M. Jeitler N. Krammer I. Krätschmer D. Liko T. Madlener I. Mikulec N. Rad J. Schieck R. Schöfbeck M. Spanring W. Waltenberger C.-E. Wulz M. Zarucki V. Drugakov V. Mossolov J. Suarez Gonzalez M. R. Darwish E. A. De Wolf D. Di Croce X. Janssen T. Kello A. Lelek M. Pieters H. Rejeb Sfar H. Van Haevermaet P. Van Mechelen S. Van Putte N. Van Remortel F. Blekman E. S. Bols S. S. Chhibra J. D’Hondt J. De Clercq D. Lontkovskyi S. Lowette I. Marchesini S. Moortgat Q. Python S. Tavernier W. Van Doninck P. Van Mulders D. Beghin B. Bilin B. Clerbaux G. De Lentdecker H. Delannoy B. Dorney L. Favart A. Grebenyuk A. K. Kalsi L. Moureaux A. Popov N. Postiau E. Starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom T. Cornelis D. Dobur I. Khvastunov M. Niedziela C. Roskas K. Skovpen M. Tytgat W. Verbeke B. Vermassen M. Vit G. Bruno C. Caputo P. David C. Delaere M. Delcourt A. Giammanco V. Lemaitre J. Prisciandaro A. Saggio P. Vischia J. Zobec G. A. Alves G. Correia Silva C. Hensel A. Moraes E. Belchior Batista Das Chagas W. Carvalho J. Chinellato E. Coelho E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao C. De Oliveira Martins S. Fonseca De Souza H. Malbouisson J. Martins D. Matos Figueiredo M. Medina Jaime M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima W. L. Prado Da Silva P. Rebello Teles L. J. Sanchez Rosas A. Santoro A. Sznajder M. Thiel E. J. Tonelli Manganote F. Torres Da Silva De Araujo A. Vilela Pereira C. A. Bernardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores D. S. Lemos P. G. Mercadante S. F. Novaes Sandra S. Padula A. Aleksandrov G. Antchev R. Hadjiiska P. Iaydjiev M. Misheva M. Rodozov M. Shopova G. Sultanov M. Bonchev A. Dimitrov T. Ivanov L. Litov B. Pavlov P. Petkov A. Petrov W. Fang X. Gao L. Yuan M. Ahmad Z. Hu Y. Wang G. M. Chen H. S. Chen M. Chen C. H. Jiang D. Leggat H. Liao Z. Liu A. Spiezia J. Tao E. Yazgan H. Zhang S. Zhang J. Zhao A. Agapitos Y. Ban G. Ch Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista São Paulo Brazil Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China National Centre for Physics Quaid-I-Azam University Islamabad Pakistan Department of Physics Tsinghua University Beijing China University of Virginia Charlottesville Virginia USA Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China The University of Kansas Lawrence Kansas USA Zhejiang University Hangzhou China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Un

The polarizations of promptly produced χc1 and χc2 mesons are studied using data collected by the CMS experiment at the LHC, in proton-proton collisions at s=8 TeV. The χc states are reconstructed via their radiative decays χc→J/ψγ, with the photons being measured through conversions to e+e−, which allows the two states to be well resolved. The polarizations are measured in the helicity frame, through the analysis of the χc2 to χc1 yield ratio as a function of the polar or azimuthal angle of the positive muon emitted in the J/ψ→μ+μ− decay, in three bins of J/ψ transverse momentum. While no differences are seen between the two states in terms of azimuthal decay angle distributions, they are observed to have significantly different polar anisotropies. The measurement favors a scenario where at least one of the two states is strongly polarized along the helicity quantization axis, in agreement with nonrelativistic quantum chromodynamics predictions. This is the first measurement of significantly polarized quarkonia produced at high transverse momentum.

关键词： Charm quark Polarization Hadron colliders

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Search for Supersymmetry with a Compressed Mass Spectrum in Events with a Soft τ Lepton, a Highly Energetic Jet, and Large Missing Transverse Momentum in Proton-Proton Collisions at s=13 TeV

引用

Physical Review Letters 2020年第4期124卷 041803-041803页

作者： A. M. Sirunyan A. Tumasyan W. Adam F. Ambrogi T. Bergauer J. Brandstetter M. Dragicevic J. Erö A. Escalante Del Valle M. Flechl R. Frühwirth M. Jeitler N. Krammer I. Krätschmer D. Liko T. Madlener I. Mikulec N. Rad J. Schieck R. Schöfbeck M. Spanring D. Spitzbart W. Waltenberger C.-E. Wulz M. Zarucki V. Drugakov V. Mossolov J. Suarez Gonzalez M. R. Darwish E. A. De Wolf D. Di Croce X. Janssen A. Lelek M. Pieters H. Rejeb Sfar H. Van Haevermaet P. Van Mechelen S. Van Putte N. Van Remortel F. Blekman E. S. Bols S. S. Chhibra J. D’Hondt J. De Clercq D. Lontkovskyi S. Lowette I. Marchesini S. Moortgat Q. Python K. Skovpen S. Tavernier W. Van Doninck P. Van Mulders D. Beghin B. Bilin H. Brun B. Clerbaux G. De Lentdecker H. Delannoy B. Dorney L. Favart A. Grebenyuk A. K. Kalsi A. Popov N. Postiau E. Starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom T. Cornelis D. Dobur I. Khvastunov M. Niedziela C. Roskas M. Tytgat W. Verbeke B. Vermassen M. Vit O. Bondu G. Bruno C. Caputo P. David C. Delaere M. Delcourt A. Giammanco V. Lemaitre J. Prisciandaro A. Saggio M. Vidal Marono P. Vischia J. Zobec F. L. Alves G. A. Alves G. Correia Silva C. Hensel A. Moraes P. Rebello Teles E. Belchior Batista Das Chagas W. Carvalho J. Chinellato E. Coelho E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao C. De Oliveira Martins S. Fonseca De Souza L. M. Huertas Guativa H. Malbouisson J. Martins D. Matos Figueiredo M. Medina Jaime M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima W. L. Prado Da Silva L. J. Sanchez Rosas A. Santoro A. Sznajder M. Thiel E. J. Tonelli Manganote F. Torres Da Silva De Araujo A. Vilela Pereira C. A. Bernardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores D. S. Lemos P. G. Mercadante S. F. Novaes Sandra S. Padula A. Aleksandrov G. Antchev R. Hadjiiska P. Iaydjiev M. Misheva M. Rodozov M. Shopova G. Sultanov M. Bonchev A. Dimitrov T. Ivanov L. Litov B. Pavlov P. Petkov W. Fang X. Gao L. Yuan G. M. Chen H. S. Chen M. Chen C. H. Jiang D. Leggat H. Liao Z. Liu A. Spiezia J. Tao E. Yazgan H. Zhang Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista São Paulo Brazil Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China The University of Kansas Lawrence Kansas USA National Centre for Physics Quaid-I-Azam University Islamabad Pakistan Tsinghua University Beijing China University of Virginia Charlottesville Virginia USA Zhejiang University Hangzhou China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Université Paris-Saclay

The first search for supersymmetry in events with an experimental signature of one soft, hadronically decaying τ lepton, one energetic jet from initial-state radiation, and large transverse momentum imbalance is presented. These event signatures are consistent with direct or indirect production of scalar τ leptons (τ˜) in supersymmetric models that exhibit coannihilation between the τ˜ and the lightest neutralino (χ˜10), and that could generate the observed relic density of dark matter. The data correspond to an integrated luminosity of 77.2 fb−1 of proton-proton collisions at s=13 TeV collected with the CMS detector at the LHC in 2016 and 2017. The results are interpreted in a supersymmetric scenario with a small mass difference (Δm) between the chargino (χ˜1±) or next-to-lightest neutralino (χ˜20), and the χ˜10. The mass of the τ˜ is assumed to be the average of the χ˜1± and χ˜10 masses. The data are consistent with standard model background predictions. Upper limits at 95% confidence level are set on the sum of the χ˜1±, χ˜20, and τ˜ production cross sections for Δm(χ˜1±,χ˜10)=50 GeV, resulting in a lower limit of 290 GeV on the mass of the χ˜1±, which is the most stringent to date and surpasses the bounds from the LEP experiments.

关键词： Supersymmetric models Superpartners Tau leptons Hadron colliders

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Publisher Correction: Observation of triple J/ψ meson production in proton-proton collisions

引用

Nature Physics 2023年 461页

作者： A. Tumasyan W. Adam J. W. Andrejkovic T. Bergauer S. Chatterjee K. Damanakis M. Dragicevic A. Escalante Del Valle R. Frühwirth M. Jeitler N. Krammer L. Lechner D. Liko I. Mikulec P. Paulitsch F. M. Pitters J. Schieck R. Schöfbeck D. Schwarz S. Templ W. Waltenberger C.-E. Wulz V. Chekhovsky A. Litomin V. Makarenko M. R. Darwish E. A. De Wolf T. Janssen T. Kello A. Lelek H. Rejeb Sfar P. Van Mechelen S. Van Putte N. Van Remortel F. Blekman E. S. Bols J. D’Hondt M. Delcourt H. El Faham S. Lowette S. Moortgat A. Morton D. Müller A. R. Sahasransu S. Tavernier W. Van Doninck D. Beghin B. Bilin B. Clerbaux G. De Lentdecker L. Favart A. K. Kalsi K. Lee M. Mahdavikhorrami I. Makarenko L. Moureaux L. Pétré A. Popov N. Postiau E. Starling L. Thomas M. Vanden Bemden C. Vander Velde P. Vanlaer T. Cornelis D. Dobur J. Knolle L. Lambrecht G. Mestdach M. Niedziela C. Rendón C. Roskas A. Samalan K. Skovpen M. Tytgat B. Vermassen L. Wezenbeek A. Benecke A. Bethani G. Bruno F. Bury C. Caputo P. David C. Delaere I. S. Donertas A. Giammanco K. Jaffel Sa. Jain V. Lemaitre K. Mondal J. Prisciandaro A. Taliercio M. Teklishyn T. T. Tran P. Vischia S. Wertz G. A. Alves C. Hensel A. Moraes P. Rebello Teles W. L. Aldá Júnior M. Alves Gallo Pereira M. Barroso Ferreira Filho H. Brandao Malbouisson W. Carvalho J. Chinellato E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao V. Dos Santos Sousa S. Fonseca De Souza C. Mora Herrera K. Mota Amarilo L. Mundim H. Nogima A. Santoro S. M. Silva Do Amaral A. Sznajder M. Thiel F. Torres Da Silva De Araujo A. Vilela Pereira C. A. Bernardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores D. S. Lemos P. G. Mercadante S. F. Novaes Sandra S. Padula A. Aleksandrov G. Antchev R. Hadjiiska P. Iaydjiev M. Misheva M. Rodozov M. Shopova G. Sultanov A. Dimitrov T. Ivanov L. Litov B. Pavlov P. Petkov A. Petrov T. Cheng T. Javaid M. Mittal L. Yuan M. Ahmad G. Bauer C. Dozen Z. Hu J. Martins Y. Wang K. Yi E. Chapon G. M. Chen H. S. Chen M. Chen F. Iemmi A. Kapoor D. Leggat H. Liao Z.-A. Liu V. Milosevic F. M Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Vienna Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Korea University Seoul Korea Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista São Paulo Brazil Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China University of Florida Gainesville Florida USA Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Sun Yat-Sen University Guangzhou China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) - Fudan University Shanghai China University of California Riverside Riverside California USA Rice University Houston Texas USA Zhejiang University Hangzhou China Zhejiang China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo

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Constraints on lightly ionizing particles from CDMSlite

arXiv

引用

arXiv 2020年

作者： Alkhatib, I. Amaral, D.W.P. Aralis, T. Aramaki, T. Arnquist, I.J. Ataee Langroudy, I. Azadbakht, E. Banik, S. Barker, D. Bathurst, C. Bauer, D.A. Bezerra, L.V.S. Bhattacharyya, R. Bowles, M.A. Brink, P.L. Bunker, R. Cabrera, B. Calkins, R. Cameron, R.A. Cartaro, C. Cerdeño, D.G. Chang, Y.-Y. Chaudhuri, M. Chen, R. Chott, N. Cooley, J. Coombes, H. Corbett, J. Cushman, P. de Brienne, F. di Vacri, M.L. Diamond, M.D. Fascione, E. Figueroa-Feliciano, E. Fink, C.W. Fouts, K. Fritts, M. Gerbier, G. Germond, R. Ghaith, M. Golwala, S.R. Harris, H.R. Hines, B.A. Hollister, M.I. Hong, Z. Hoppe, E.W. Hsu, L. Huber, M.E. Iyer, V. Jardin, D. Jastram, A. Kashyap, V.K.S. Kelsey, M.H. Kubik, A. Kurinsky, N.A. Lawrence, R.E. Li, A. Loer, B. Lopez Asamar, E. Lukens, P. MacFarlane, D.B. Mahapatra, R. Mandic, V. Mast, N. Mayer, A.J. Meyer zu Theenhausen, H. Michaud, É.M. Michielin, E. Mirabolfathi, N. Mohanty, B. Morales Mendoza, J.D. Nagorny, S. Nelson, J. Neog, H. Novati, V. Orrell, J.L. Oser, S.M. Page, W.A. Partridge, R. Podviianiuk, R. Ponce, F. Poudel, S. Pradeep, A. Pyle, M. Rau, W. Reid, E. Ren, R. Reynolds, T. Roberts, A. Robinson, A.E. Saab, T. Sadoulet, B. Sander, J. Sattari, A. Schnee, R.W. Scorza, S. Serfass, B. Sincavage, D.J. Stanford, C. Street, J. Toback, D. Underwood, R. Verma, S. Villano, A.N. von Krosigk, B. Watkins, S.L. Wilson, J.S. Wilson, M.J. Winchell, J. Wright, D.H. Yellin, S. Young, B.A. Yu, T.C. Zhang, E. Zhang, H.G. Zhao, X. Zheng, L. Department of Physics University of Toronto TorontoONM5S 1A7 Canada Department of Physics Durham University DurhamDH1 3LE United Kingdom Division of Physics Mathematics & Astronomy California Institute of Technology PasadenaCA91125 United States SLAC National Accelerator Laboratory Kavli Institute for Particle Astrophysics and Cosmology Menlo ParkCA94025 United States Pacific Northwest National Laboratory RichlandWA99352 United States Department of Physics and Astronomy The Mitchell Institute for Fundamental Physics and Astronomy Texas A&M University College StationTX77843 United States School of Physical Sciences National Institute of Science Education and Research HBNI Jatni752050 India School of Physics & Astronomy University of Minnesota MinneapolisMN55455 United States Department of Physics University of Florida GainesvilleFL32611 United States Fermi National Accelerator Laboratory BataviaIL60510 United States Department of Physics & Astronomy University of British Columbia VancouverBCV6T 1Z1 Canada TRIUMF VancouverBCV6T 2A3 Canada Department of Physics South Dakota School of Mines and Technology Rapid CitySD57701 United States Department of Physics Stanford University StanfordCA94305 United States Department of Physics Southern Methodist University DallasTX75275 United States Instituto de Física Teórica UAM/CSIC Universidad Autónoma de Madrid Madrid28049 Spain Department of Physics & Astronomy Northwestern University EvanstonIL60208-3112 United States Department of Physics Queen's University KingstonONK7L 3N6 Canada Département de Physique Université de Montréal MontréalQCH3C 3J7 Canada Department of Physics University of California BerkeleyCA94720 United States Department of Electrical and Computer Engineering Texas A&M University College StationTX77843 United States Department of Physics University of Colorado Denver DenverCO80217 United States Department of Electrical Engineering University of Col

The Cryogenic Dark Matter Search low ionization threshold experiment (CDMSlite) achieved efficient detection of very small recoil energies in its germanium target, resulting in sensitivity to Lightly Ionizing Particles (LIPs) in a previously unexplored region of charge, mass, and velocity parameter space. We report first direct-detection limits calculated using the optimum interval method on the vertical intensity of cosmogenically-produced LIPs with an electric charge smaller than e/(3 × 105), as well as the strongest limits for charge ≤ e/160, with a minimum vertical intensity of 1.36 × 10−7 cm−2s−1sr−1 at charge e/160. These results apply over a wide range of LIP masses (5 MeV/c2 to 100 TeV/c2) and cover a wide range of βγ values (0.1 - 106), thus excluding non-relativistic LIPs with βγ as small as 0.1 for the first time. © 2020, CC BY.

关键词： Galaxies

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Constraints on low-mass, relic dark matter candidates from a surface-operated SuperCDMS single-charge sensitive detector

arXiv

引用

arXiv 2020年

作者： Amaral, D.W. Aralis, T. Aramaki, T. Arnquist, I.J. Azadbakht, E. Banik, S. Barker, D. Bathurst, C. Bauer, D.A. Bezerra, L.V.S. Bhattacharyya, R. Binder, T. Bowles, M.A. Brink, P.L. Bunker, R. Cabrera, B. Calkins, R. Cameron, R.A. Cartaro, C. Cerdeño, D.G. Chang, Y.-Y. Chen, R. Chott, N. Cooley, J. Coombes, H. Corbett, J. Cushman, P. de Brienne, F. di Vacri, M.L. Diamond, M.D. Fascione, E. Figueroa-Feliciano, E. Fink, C.W. Fouts, K. Fritts, M. Gerbier, G. Germond, R. Ghaith, M. Golwala, S.R. Harris, H.R. Herbert, N. Hines, B.A. Hollister, M.I. Hong, Z. Hoppe, E.W. Hsu, L. Huber, M.E. Iyer, V. Jardin, D. Jastram, A. Kelsey, M.H. Kubik, A. Kurinsky, N.A. Lawrence, R.E. Li, A. Loer, B. Asamar, E. Lopez Lukens, P. MacDonell, D. MacFarlane, D.B. Mahapatra, R. Mandic, V. Mast, N. Mayer, A.J. Michaud, É.M. Michielin, E. Mirabolfathi, N. Mohanty, B. Mendoza, J.D. Morales Nagorny, S. Nelson, J. Neog, H. Novati, V. Orrell, J.L. Oser, S.M. Page, W.A. Pakarha, P. Partridge, R. Podviianiuk, R. Ponce, F. Poudel, S. Pyle, M. Rau, W. Reid, E. Ren, R. Reynolds, T. Roberts, A. Robinson, A.E. Rogers, H.E. Saab, T. Sadoulet, B. Sander, J. Sattari, A. Schnee, R.W. Scorza, S. Serfass, B. Sincavage, D.J. Stanford, C. Stein, M. Street, J. Toback, D. Underwood, R. Verma, S. Villano, A.N. von Krosigk, B. Watkins, S.L. Wills, L. Wilson, J.S. Wilson, Matthew J. Winchell, J. Wright, D.H. Yellin, S. Young, B.A. Yu, T.C. Zhang, E. Zhang, H.G. Zhao, X. Zheng, L. Department of Physics Durham University DurhamDH1 3LE United Kingdom Division of Physics Mathematics & Astronomy California Institute of Technology PasadenaCA91125 United States SLAC National Accelerator Laboratory Kavli Institute for Particle Astrophysics and Cosmology Menlo ParkCA94025 United States Pacific Northwest National Laboratory RichlandWA99352 United States Department of Physics and Astronomy The Mitchell Institute for Fundamental Physics and Astronomy Texas A&M University College StationTX77843 United States School of Physical Sciences National Institute of Science Education and Research HBNI Jatni752050 India School of Physics & Astronomy University of Minnesota MinneapolisMN55455 United States Department of Physics University of Florida GainesvilleFL32611 United States Fermi National Accelerator Laboratory BataviaIL60510 United States Department of Physics & Astronomy University of British Columbia VancouverBCV6T 1Z1 Canada TRIUMF VancouverBCV6T 2A3 Canada Department of Physics University of South Dakota VermillionSD57069 United States Department of Physics South Dakota School of Mines and Technology Rapid CitySD57701 United States Department of Physics Stanford University StanfordCA94305 United States Department of Physics Southern Methodist University DallasTX75275 United States Instituto de Física Teórica UAM/CSIC Universidad Autónoma de Madrid Madrid28049 Spain Department of Physics & Astronomy Northwestern University EvanstonIL60208-3112 United States Department of Physics Queen's University KingstonONK7L 3N6 Canada Département de Physique Université de Montréal MontréalQCH3C 3J7 Canada Department of Physics University of Toronto TorontoONM5S 1A7 Canada Department of Physics University of California BerkeleyCA94720 United States Department of Electrical and Computer Engineering Texas A&M University College StationTX77843 United States Department of Physics University of Colorado Denver

This article presents an analysis and the resulting limits on light dark matter inelastically scattering off of electrons, and on dark photon and axion-like particle absorption, using a second-generation SuperCDMS high-voltage eV-resolution detector. The 0.93 gram Si detector achieved a 3 eV phonon energy resolution;for a detector bias of 100 V, this corresponds to a charge resolution of 3 % of a single electron-hole pair. The energy spectrum is reported from a blind analysis with 1.2 gram-days of exposure acquired in an above-ground laboratory. With charge carrier trapping and impact ionization effects incorporated into the dark matter signal models, the dark matter-electron cross section σ¯e is constrained for dark matter masses from 0.5-104 MeV/c2;in the mass range from 1.2-50 eV/c2 the dark photon kinetic mixing parameter Ε and the axioelectric coupling constant gae are constrained. The minimum 90 % confidence-level upper limits within the above mentioned mass ranges are σ¯e = 8.7 × 10−34 cm2, Ε = 3.3 × 10−14, and gae = 1.0 × 10−9 Copyright © 2020, The Authors. All rights reserved.

关键词： Impact ionization

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