检索结果-内蒙古大学图书馆

arXiv 2021年

作者： Narayan, Ramesh Palumbo, Daniel C.M. Johnson, Michael D. Gelles, Zachary Himwich, Elizabeth Chang, Dominic O. Ricarte, Angelo Dexter, Jason Gammie, Charles F. Chael, Andrew A. Akiyama, Kazunori Alberdi, Antxon Alef, Walter Algaba, Juan Carlos Anantua, Richard Asada, Keiichi Azulay, Rebecca Baczko, Anne-Kathrin Ball, David Baloković, Mislav Barrett, John Benson, Bradford A. Bintley, Dan Blackburn, Lindy Blundell, Raymond Boland, Wilfred Bouman, Katherine L. Bower, Geoffrey C. Boyce, Hope Bremer, Michael Brinkerink, Christiaan D. Brissenden, Roger Britzen, Silke Broderick, Avery E. Broguiere, Dominique Bronzwaer, Thomas Byun, Do-Young Carlstrom, John E. Chan, Chi-Kwan Chatterjee, Shami Chatterjee, Koushik Chen, Ming-Tang Chen, Yongjun Chesler, Paul M. Cho, Ilje Christian, Pierre Conway, John E. Cordes, James M. Crawford, Thomas M. Crew, Geoffrey B. Cruz-Osorio, Alejandro Cui, Yuzhu Davelaar, Jordy de Laurentis, Mariafelicia Deane, Roger Dempsey, Jessica Desvignes, Gregory Doeleman, Sheperd S. Eatough, Ralph P. Falcke, Heino Farah, Joseph Fish, Vincent L. Fomalont, Ed Alyson Ford, H. Fraga-Encinas, Raquel Friberg, Per Fromm, Christian M. Fuentes, Antonio Galison, Peter García, Roberto Gentaz, Olivier Georgiev, Boris Goddi, Ciriaco Gold, Roman Gómez, José L. Gómez-Ruiz, Arturo I. Gu, Minfeng Gurwell, Mark Hada, Kazuhiro Haggard, Daryl Hecht, Michael H. Hesper, Ronald Ho, Luis C. Ho, Paul Honma, Mareki Huang, Chih-Wei L. Huang, Lei Hughes, David H. Ikeda, Shiro Inoue, Makoto Issaoun, Sara James, David J. Jannuzi, Buell T. Janssen, Michael Jeter, Britton Jiang, Wu Jimenez-Rosales, Alejandra Jorstad, Svetlana Jung, Taehyun Karami, Mansour Karuppusamy, Ramesh Kawashima, Tomohisa Keating, Garrett K. Kettenis, Mark Kim, Dong-Jin Kim, Jae-Young Kim, Jongsoo Kim, Junhan Kino, Motoki Koay, Jun Yi Kofuji, Yutaro Koch, Patrick M. Koyama, Shoko Kramer, Michael Kramer, Carsten Krichbaum, Thomas P. Kuo, Cheng-Yu Lauer, Tod R. Lee, Sang-Sung Levis, Aviad Li, Yan-Rong Li, Zhiyuan Lindqvist, Michael Lico, Rocco Lindahl, Greg Liu, Jun Center for Astrophysics Harvard & Smithsonian 60 Garden Street CambridgeMA02138 United States Black Hole Initiative at Harvard University 20 Garden Street CambridgeMA02138 United States Center for the Fundamental Laws of Nature Harvard University CambridgeMA02138 United States JILA Department of Astrophysical and Planetary Sciences University of Colorado BoulderCO80309 United States Department of Physics University of Illinois at Urbana-Champaign 1110 West Green Street UrbanaIL61801 United States Department of Astronomy University of Illinois at Urbana-Champaign 1002 West Green Street UrbanaIL61801 United States Princeton Center for Theoretical Science Jadwin Hall Princeton University PrincetonNJ08544 United States NASA Hubble Fellowship Program Einstein United States Massachusetts Institute of Technology Haystack Observatory 99 Millstone Road WestfordMA01886 United States National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomía s/n GranadaE-18008 Spain Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 BonnD-53121 Germany Department of Physics Faculty of Science University of Malaya Kuala Lumpur50603 Malaysia Center for Astrophysics - Harvard & Smithsonian 60 Garden Street CambridgeMA02138 United States Center for Computational Astrophysics Flatiron Institute 162 Fifth Avenue New YorkNY10010 United States Institute of Astronomy and Astrophysics Academia Sinica 11F of Astronomy-Mathematics Building AS/NTU No. 1 Sec. 4 Roosevelt Rd Taipei10617 Taiwan Departament d'Astronomia i Astrofísica Universitat de València C. Dr. Moliner 50 Burjassot ValènciaE-46100 Spain Observatori Astronòmic Universitat de València C. Catedrático José Beltrán 2 Paterna ValènciaE-46980 Spain Steward Observatory Department of Astronomy University of Arizona 933 N. Cherry Ave. TucsonAZ85721 United States Fermi National Accelerator Laboratory

Synchrotron radiation from hot gas near a black hole results in a polarized image. The image polarization is determined by effects including the orientation of the magnetic field in the emitting region, relativistic motion of the gas, strong gravitational lensing by the black hole, and parallel transport in the curved spacetime. We explore these effects using a simple model of an axisymmetric, equatorial accretion disk around a Schwarzschild black hole. By using an approximate expression for the null geodesics derived by Beloborodov (2002) and conservation of the Walker-Penrose constant, we provide analytic estimates for the image polarization. We test this model using currently favored general relativistic magnetohydrodynamic simulations of M87*, using ring parameters given by the simulations. For a subset of these with modest Faraday effects, we show that the ring model broadly reproduces the polarimetric image morphology. Our model also predicts the polarization evolution for compact flaring regions, such as those observed from Sgr A* with GRAVITY. With suitably chosen parameters, our simple model can reproduce the EVPA pattern and relative polarized intensity in Event Horizon Telescope images of M87*. Under the physically motivated assumption that the magnetic field trails the fluid velocity, this comparison is consistent with the clockwise rotation inferred from total intensity images. Copyright © 2021, The Authors. All rights reserved.

关键词： Black holes

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A new tool for cme arrival time prediction using machine learning algorithms: Cat-puma

arXiv

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arXiv 2018年

作者： Liu, Jiajia Ye, Yudong Shen, Chenglong Wang, Yuming Erdélyi, Robert School of Mathematics and Statistics University of Sheffield SheffieldS3 7RH United Kingdom State Key Laboratory of Space Weather National Space Science Center Sigma Weather Group Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China Department of Geophysics and Planetary Sciences Cas Key Laboratory of Geospace Environment University of Science and Technology of China Hefei Anhui230026 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui230026 China Department of Astronomy Eötvös Loránd University BudapestH-1117 Hungary

Coronal Mass Ejections (CMEs) are arguably the most violent eruptions in the Solar System. CMEs can cause severe disturbances in the interplanetary space and even affect human activities in many respects, causing damages to infrastructure and losses of revenue. Fast and accurate prediction of CME arrival time is then vital to minimize the disruption CMEs may cause when interacting with geospace. In this paper, we propose a new approach for partial-/full-halo CME Arrival Time Prediction Using Machine learning Algorithms (CAT-PUMA). Via detailed analysis of the CME features and solar wind parameters, we build a prediction engine taking advantage of 182 previously observed geo-effective partial-/full-halo CMEs and using algorithms of the Support Vector Machine (SVM). We demonstrate that CAT-PUMA is accurate and fast. In particular, predictions after applying CAT-PUMA to a test set, that is unknown to the engine, show a mean absolute prediction error ∼5.9 hours of the CME arrival time, with 54% of the predictions having absolute errors less than 5.9 hours. Comparison with other models reveals that CATPUMA has a more accurate prediction for 77% of the events investigated;and can be carried out very fast, i.e. within minutes after providing the necessary input parameters of a CME. A practical guide containing the CAT-PUMA engine and the source code of two examples are available in the Appendix, allowing the community to perform their own applications for prediction using CAT-PUMA. Copyright © 2018, The Authors. All rights reserved.

关键词： Engines

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Measurement of the CKM matrix element |Vcb| from B0→D*−ℓ+νℓ at Belle

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Physical Review D 2019年第5期100卷 052007-052007页

作者： E. Waheed P. Urquijo D. Ferlewicz I. Adachi K. Adamczyk H. Aihara S. Al Said D. M. Asner H. Atmacan T. Aushev R. Ayad V. Babu I. Badhrees V. Bansal P. Behera C. Beleño F. Bernlochner B. Bhuyan T. Bilka J. Biswal A. Bobrov G. Bonvicini A. Bozek M. Bračko T. E. Browder M. Campajola D. Červenkov P. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin H. E. Cho K. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe S. Di Carlo Z. Doležal T. V. Dong D. Dossett S. Eidelman D. Epifanov J. E. Fast B. G. Fulsom R. Garg V. Gaur A. Garmash A. Giri P. Goldenzweig B. Golob O. Grzymkowska J. Haba T. Hara K. Hayasaka H. Hayashii M. T. Hedges W.-S. Hou C.-L. Hsu T. Iijima K. Inami G. Inguglia A. Ishikawa M. Iwasaki Y. Iwasaki W. W. Jacobs H. B. Jeon S. Jia Y. Jin D. Joffe K. K. Joo J. Kahn A. B. Kaliyar G. Karyan T. Kawasaki C. H. Kim D. Y. Kim K. T. Kim S. H. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger P. Krokovny T. Kuhr R. Kulasiri A. Kuzmin Y.-J. Kwon J. S. Lange J. Y. Lee S. C. Lee C. H. Li L. K. Li Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev P.-C. Lu T. Luo J. MacNaughton M. Masuda D. Matvienko M. Merola F. Metzner K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty T. Mori R. Mussa I. Nakamura M. Nakao K. J. Nath Z. Natkaniec M. Nayak M. Niiyama N. K. Nisar S. Nishida K. Nishimura S. Ogawa H. Ono P. Pakhlov G. Pakhlova B. Pal S. Pardi H. Park S.-H. Park S. Paul R. Pestotnik L. E. Piilonen V. Popov E. Prencipe M. Prim A. Rostomyan G. Russo Y. Sakai M. Salehi S. Sandilya T. Sanuki V. Savinov O. Schneider G. Schnell J. Schueler C. Schwanda Y. Seino K. Senyo O. Seon M. E. Sevior V. Shebalin C. P. Shen J.-G. Shiu B. Shwartz F. Simon A. Sokolov E. Solovieva S. Stanič M. Starič Z. S. Stottler J. F. Strube T. Sumiyoshi M. Takizawa K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno Y. Usov G. Varner K. E. Varvell A. Vinokurova A. Vossen C. H. Wang M.-Z. Wang P. Wang E. Won S. B. Yang H. Ye Y. Yusa Z. P. Zhang V. Zhilich V. Zhukova School of Physics University of Melbourne Victoria 3010 High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 Department of Physics University of Tokyo Tokyo 113-0033 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Department of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Brookhaven National Laboratory Upton New York 11973 University of South Carolina Columbia South Carolina 29208 Moscow Institute of Physics and Technology Moscow Region 141700 Tata Institute of Fundamental Research Mumbai 400005 King Abdulaziz City for Science and Technology Riyadh 11442 Pacific Northwest National Laboratory Richland Washington 99352 Indian Institute of Technology Madras Chennai 600036 II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen University of Bonn 53115 Bonn Indian Institute of Technology Guwahati Assam 781039 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 Wayne State University Detroit Michigan 48202 University of Maribor 2000 Maribor University of Hawaii Honolulu Hawaii 96822 INFN—Sezione di Napoli 80126 Napoli Università di Napoli Federico II 80055 Napoli Department of Physics National Taiwan University Taipei 10617 Max-Planck-Institut für Physik 80805 München National Central University Chung-li 32054 Hanyang University Seoul 133-791 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Korea Institute of Science and Technology Information Daejeon 305-806 Gyeongsang National University Chinju 660-701 Sungkyunkwan University Suwon 440-746 Indian Institute of Technology Hyderabad Telangana 502285 Deutsches Elektronen–Synchrotron 22607 Hamburg LAL Univ. Paris-Sud

We present a new measurement of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| from B0→D*−ℓ+νℓ decays, reconstructed with the full Belle data set of 711 fb−1 integrated luminosity. Two form factor parametrizations, originally conceived by the Caprini-Lellouch-Neubert (CLN) and the Boyd, Grinstein and Lebed (BGL) groups, are used to extract the product F(1)ηEW|Vcb| and the decay form factors, where F(1) is the normalization factor and ηEW is a small electroweak correction. In the CLN parametrization we find F(1)ηEW|Vcb|=(35.06±0.15±0.56)×10−3, ρ2=1.106±0.031±0.007, R1(1)=1.229±0.028±0.009, R2(1)=0.852±0.021±0.006. For the BGL parametrization we obtain F(1)ηEW|Vcb|=(34.93±0.23±0.59)×10−3, which is consistent with the world average when correcting for F(1)ηEW. The branching fraction of B0→D*−ℓ+νℓ is measured to be B(B0→D*−ℓ+νℓ)=(4.90±0.02±0.16)%. We also present a new test of lepton flavor universality violation in semileptonic B decays, B(B0→D*−e+ν)B(B0→D*−μ+ν)=1.01±0.01±0.03. The errors quoted correspond to the statistical and systematic uncertainties, respectively. This is the most precise measurement of F(1)ηEW|Vcb| and form factors to date and the first experimental study of the BGL form factor parametrization in an experimental measurement.

关键词： Electroweak radiative corrections Flavor changing neutral currents Form factors Particle interactions W & Z bosons

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Quantifying local predictability of the Lorenz system using the nonlinear local Lyapunov exponent

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Atmospheric and Oceanic science Letters 2017年第5期10卷 372-378页

作者： HUAI Xiao-Wei LI Jian-Ping DING Rui-Qiang FENG Jie LIU De-Qiang State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric PhysicsChinese Academy of Sciences Beijing China College of Earth Science University of Chinese Academy of Sciences Beijing China College of Global Change and Earth System Science (GCESS) Beijing Normal University Beijing China Joint Center for Global Change Studies Beijing Normal University Beijing China College of Atmospheric Sciences Plateau Atmosphere and Environment Key Laboratory of Sichuan Province Chengdu University of Information Technology Chengdu China GIobal Systems Division Earth System Research Laboratory/Oceanic and Atmospheric Research/National Oceanic and Atmospheric Administration Boulder CO USA Fujian Meteorological Observatory Fuzhou China

The nonlinear local Lyapunov exponent（NLLE） can be used as a quantification of the local predictability limit of chaotic systems. In this study, the phase-spatial structure of the local predictability limit over the Lorenz-63 system is investigated. It is found that the inner and outer rims of each regime of the attractor have a high probability of a longer than average local predictability limit, while the center part is the opposite. However, the distribution of the local predictability limit is nonuniformly organized, with adjacent points sometimes showing quite distinct error *** source of local predictability is linked to the local dynamics, which is related to the region in the phase space and the duration on the current regime.

关键词： Nonlinear local Lyapunov exponent local predictability limit chaotic system Lorenz system

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test of lepton flavor universality and search for lepton flavor violation in B → K decays

arXiv

引用

arXiv 2019年

作者： Choudhury, S. Sandilya, Saurabh Trabelsi, K. Giri, A. Aihara, H. Al Said, S. Asner, D.M. Atmacan, H. Aulchenko, V. Aushev, T. Ayad, R. Babu, V. Bahinipati, S. Behera, P. Beleño, C. Belous, K. Bennett, J. Bernlochner, F. Bessner, M. Bhardwaj, V. Bilka, T. Biswal, J. Bonvicini, G. Bozek, A. Bračko, M. Browder, T.E. Campajola, M. Červenkov, D. Chang, M.-C. Chang, P. Chekelian, V. Chen, A. Cheon, B.G. Chilikin, K. Cho, K. Choi, S.-K. Choi, Y. Cinabro, D. Cunliffe, S. Dash, N. de Nardo, G. Dhamija, R. Di Capua, F. Dingfelder, J. Doležal, Z. Dong, T.V. Dossett, D. Dubey, S. Eidelman, S. Epifanov, D. Ferber, T. Ferlewicz, D. Fulsom, B.G. Garg, R. Gaur, V. Gabyshev, N. Garmash, A. Goldenzweig, P. Golob, B. Greenwald, D. Hadjivasiliou, C. Hartbrich, O. Hayashii, H. Hedges, M.T. Hernandez Villanueva, M. Higuchi, T. Hou, W.-S. Hsu, C.-L. Iijima, T. Inami, K. Ishikawa, A. Itoh, R. Iwasaki, M. Iwasaki, Y. Jacobs, W.W. Jang, E.-J. Jeon, H.B. Jia, S. Jin, Y. Joo, C.W. Joo, K.K. Kahn, J. Kaliyar, A.B. Kang, K.H. Karyan, G. Kichimi, H. Kiesling, C. Kim, B.H. Kim, D.Y. Kim, K.-H. Kim, K.T. Kim, S.H. Kim, Y.-K. Kinoshita, K. Kodyš, P. Korpar, S. Kotchetkov, D. Križan, P. Kroeger, R. Krokovny, P. Kuhr, T. Kulasiri, R. Kumar, R. Kumara, K. Kuzmin, A. Kwon, Y.-J. Lalwani, K. Lee, S.C. Lewis, P. Li, C.H. Li, L.K. Li, Y.B. Li Gioi, L. Libby, J. Lieret, K. Liptak, Z. Liventsev, D. Luo, T. Masuda, M. Matsuda, T. Matvienko, D. Merola, M. Miyabayashi, K. Mizuk, R. Mohanty, G.B. Mohanty, S. Moon, T.J. Mori, T. Nakamura, I. Nakamura, K.R. Nakao, M. Natkaniec, Z. Natochii, A. Nayak, L. Nayak, M. Niiyama, M. Nisar, N.K. Nishida, S. Ogawa, K. Ono, H. Onuki, Y. Oskin, P. Pakhlov, P. Pakhlova, G. Pardi, S. Park, H. Park, S.-H. Patra, S. Paul, S. Pedlar, T.K. Pestotnik, R. Piilonen, L.E. Podobnik, T. Popov, V. Prencipe, E. Prim, M.T. Rabusov, A. Rostomyan, A. Rout, N. Rozanska, M. Hiroshima University Japan University of the Basque Country UPV EHU Bilbao48080 Spain University of Bonn Bonn53115 Germany Brookhaven National Laboratory UptonNY11973 United States Budker Institute of Nuclear Physics SB RAS Novosibirsk630090 Russia Faculty of Mathematics and Physics Charles University Prague121 16 Czech Republic Chonnam National University Gwangju61186 Korea Republic of University of Cincinnati CincinnatiOH45221 United States Deutsches Elektronen-Synchrotron Hamburg22607 Germany University of Florida GainesvilleFL32611 United States Department of Physics Fu Jen Catholic University Taipei24205 Taiwan Institute of Modern Physics Fudan University Shanghai200443 China II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen37073 Germany Hayama240-0193 Japan Gyeongsang National University Jinju52828 Korea Republic of Department of Physics Institute of Natural Sciences Hanyang University Seoul04763 Korea Republic of University of Hawaii HonoluluHI96822 United States Tsukuba305-0801 Japan Tsukuba305-0801 Japan Moscow101000 Russia Forschungszentrum Jülich Jülich52425 Germany IKERBASQUE Basque Foundation for Science Bilbao48013 Spain Indian Institute of Science Education and Research Mohali SAS Nagar140306 India Indian Institute of Technology Bhubaneswar Satya Nagar751007 India Indian Institute of Technology Hyderabad Telangana502285 India Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47408 United States Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Institute for High Energy Physics Protvino142281 Russia Institute of High Energy Physics Vienna1050 Austria INFN - Sezione di Napoli Napoli80126 Italy INFN - Sezione di Torino Torino10125 Italy Advanced Science Research Center Japan Atomic Energy Agency Naka319-1195 Japan J. Stefan Institute Ljubljana1000 Slovenia Institut für Experimentelle

We present measurements of the branching fractions for the decays B → Kµ+µ− and B → Ke+e−, and their ratio (RK), using a data sample of 711 fb−1 that contains 772 × 106 BB¯ events. The data were collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. The ratio RK is measured in five bins of dilepton invariant-mass-squared (q2): q2 ∈ (0.1, 4.0), (4.00, 8.12), (1.0, 6.0), (10.2, 12.8) and (> 14.18) GeV2/c4, along with the whole q2 region. The RK value for q2 ∈ (1.0, 6.0) GeV2/c4 is 1.03+0−0.2824 ± 0.01. The first and second uncertainties listed are statistical and systematic, respectively. All results for RK are consistent with Standard Model predictions. We also measure CP -averaged isospin asymmetries in the same q2 bins. The results are consistent with a null asymmetry, with the largest difference of 2.6 standard deviations occurring for the q2 ∈ (1.0, 6.0) GeV2/c4 bin in the mode with muon final states. The measured differential branching fractions, dB/dq2, are consistent with theoretical predictions for charged B decays, while the corresponding values are below the expectations for neutral B decays. We have also searched for lepton-flavor-violating B → Kµ±e decays and set 90% confidence-level upper limits on the branching fraction in the range of 10−8 for B+ → K+µ±e, and B0 → K0µ±e modes. Copyright © 2019, The Authors. All rights reserved.

关键词： Germanium alloys

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test of lepton-flavor universality in B → K∗l+l− decays at Belle

arXiv

引用

arXiv 2019年

作者： Wehle, Simon Adachi, I. Adamczyk, K. Aihara, H. Asner, D.M. Atmacan, H. Aulchenko, V. Aushev, T. Ayad, R. Babu, V. Behera, P. Berger, M. Bhardwaj, V. Biswal, J. Bozek, A. Bračko, M. Browder, T.E. Campajola, M. Cao, L. Chang, M.-C. Chen, A. Cheon, B.G. Chilikin, K. Cho, K. Choi, Y. Choudhury, S. Cinabro, D. Cunliffe, S. Dash, N. de Nardo, G. Di Capua, F. Dubey, S. Eidelman, S. Epifanov, D. Ferber, T. Fulsom, B.G. Garg, R. Gaur, V. Gabyshev, N. Garmash, A. Giri, A. Goldenzweig, P. Greenwald, D. Guan, Y. Haba, J. Hartbrich, O. Hayasaka, K. Hayashii, H. Hedges, M.T. Higuchi, T. Hou, W.-S. Hsu, C.-L. Iijima, T. Inami, K. Inguglia, G. Ishikawa, A. Itoh, R. Iwasaki, M. Iwasaki, Y. Jacobs, W.W. Jia, S. Jin, Y. Joffe, D. Kahn, J. Kaliyar, A.B. Karyan, G. Kichimi, H. Kim, D.Y. Kim, K.T. Kim, S.H. Kim, Y.-K. Kinoshita, K. Komarov, I. Korpar, S. Kotchetkov, D. Kroeger, R. Krokovny, P. Kuhr, T. Kulasiri, R. Kumar, R. Kumara, K. Kuzmin, A. Kwon, Y.-J. Lange, J.S. Lee, J.Y. Lee, S.C. Li, Y.B. Libby, J. Liptak, Z. Liventsev, D. Luo, T. MacNaughton, J. Masuda, M. Matsuda, T. McNeil, J.T. Merola, M. Metzner, F. Miyata, H. Mizuk, R. Mohanty, G.B. Moon, T.J. Mussa, R. Nakao, M. Natochii, A. Nayak, M. Niebuhr, C. Niiyama, M. Nisar, N.K. Nishida, S. Ogawa, K. Ogawa, S. Ono, H. Onuki, Y. Pakhlov, P. Pakhlova, G. Park, H. Park, S.-H. Pedlar, T.K. Pestotnik, R. Piilonen, L.E. Podobnik, T. Popov, V. Prencipe, E. Prim, M.T. Resmi, P.K. Ritter, M. Rostomyan, A. Rout, N. Russo, G. Sahoo, D. Sakai, Y. Sandilya, S. Sangal, A. Santelj, L. Savinov, V. Schneider, O. Schnell, G. Schueler, J. Schwanda, C. Schwartz, A.J. Seino, Y. Senyo, K. Sevior, M.E. Shapkin, M. Shiu, J.-G. Shwartz, B. Solovieva, E. Starič, M. Strube, J.F. Sumiyoshi, T. Sutcliffe, W. Takizawa, M. Tamponi, U. Tanida, K. Tao, Y. Tenchini, F. Trabelsi, K. Uchida, M. Uglov, T. Unno, Y. Uno, S. Ushiroda, Y. University of the Basque Country UPV EHU Bilbao48080 Spain University of Bonn Bonn53115 Germany Brookhaven National Laboratory Upton New York11973 United States Budker Institute of Nuclear Physics SB RAS Novosibirsk630090 Russia University of Cincinnati CincinnatiOH45221 United States Deutsches Elektronen-Synchrotron Hamburg22607 Germany University of Florida GainesvilleFL32611 United States Department of Physics Fu Jen Catholic University Taipei24205 Taiwan Institute of Modern Physics Fudan University Shanghai200443 China Justus-Liebig-Universität Gießen Gießen35392 Germany Hayama240-0193 Japan Department of Physics Institute of Natural Sciences Hanyang University Seoul04763 Korea Republic of University of Hawaii HonoluluHI96822 United States Tsukuba305-0801 Japan Tsukuba305-0801 Japan Moscow101000 Russia Forschungszentrum Jülich Jülich52425 Germany Hiroshima Institute of Technology Hiroshima731-5193 Japan IKERBASQUE Basque Foundation for Science Bilbao48013 Spain Indian Institute of Science Education and Research Mohali SAS Nagar140306 India Indian Institute of Technology Hyderabad Telangana502285 India Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47408 United States Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Institute of High Energy Physics Vienna1050 Austria Institute for High Energy Physics Protvino142281 Russia INFN - Sezione di Napoli Napoli80126 Italy INFN - Sezione di Torino Torino10125 Italy Advanced Science Research Center Japan Atomic Energy Agency Naka319-1195 Japan J. Stefan Institute Ljubljana1000 Slovenia Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie Karlsruhe76131 Germany University of Tokyo Kashiwa277-8583 Japan Kennesaw State University KennesawGA30144 United States Korea Institute of Science and Technology Information Daejeon34141 Korea Republic of Kor

We present a measurement of RK∗, the branching fraction ratio B(B → K∗µ+µ−)/ B(B → K∗e+e−), for both charged and neutral B mesons. The ratio for the charged case, RK∗+, is the first measurement ever performed. In addition, we report absolute branching fractions for the individual modes in bins of the squared dilepton invariant mass, q2. The analysis is based on a data sample of 711 fb−1, containing 772×106 BB¯ events, recorded at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. The obtained results are consistent with Standard Model expectations. Copyright © 2019, The Authors. All rights reserved.

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Digital predistortion, all-digital transmitter, baseband equivalent model

arXiv

引用

arXiv 2017年

作者： Lin, De-Ye Song, Haifeng Hui, Xi Dong State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing100083 Institute of Applied Physics and Computational Mathematics Fenghao East Road 2 Beijing100094 CAEP Software Center for High Performance Numerical Simulation Huayuan Road 6 Beijing100088

In this work, a many-body potential of Nb for radiation damage simulation was developed based on embedded-atom-method (EAM), and most of the point defects of Nb can be predicted properly by this potential. By using the constructed potential, the direction-specific threshold displacement energies (TDE) and displacement cascades up to 20 keV of Nb were performed through molecular dynamics simulations. The calculated results of TDE are in good agreement with previous work for V, Mo and experimental measurements. Lowest TDE was found in direction, and local minas of TDE were found in three low-index directions, which has relation:E[100]dE[111]dE[110]d. The evolution of displacement cascades, number of the created point defects, the cascade efficiency the clustering of point defects, and temperature role of these parameters at different PKA energies were systematic investigated. It is found that the cascade efficiency is low and it is can be fitted by a power function as many published work did. The fraction of clustered point defects obtained in this work is low, and only some small clusters were formed at the end of thermal spike. As the temperature increases, the productions of point defects and cascade efficiency were somewhat decreases, however, the fraction of clustered point defects decreases more obvious. Copyright © 2017, The Authors. All rights reserved.

关键词： Molecular dynamics

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Evaluation of the Interplanetary Magnetic Field Strength Using the Cosmic-Ray Shadow of the Sun

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Physical Review Letters 2018年第3期120卷 031101-031101页

作者： M. Amenomori X. J. Bi D. Chen T. L. Chen W. Y. Chen S. W. Cui Danzengluobu L. K. Ding C. F. Feng Zhaoyang Feng Z. Y. Feng Q. B. Gou Y. Q. Guo H. H. He Z. T. He K. Hibino N. Hotta Haibing Hu H. B. Hu J. Huang H. Y. Jia L. Jiang F. Kajino K. Kasahara Y. Katayose C. Kato K. Kawata M. Kozai Labaciren G. M. Le A. F. Li H. J. Li W. J. Li C. Liu J. S. Liu M. Y. Liu H. Lu X. R. Meng T. Miyazaki K. Mizutani K. Munakata T. Nakajima Y. Nakamura H. Nanjo M. Nishizawa T. Niwa M. Ohnishi I. Ohta S. Ozawa X. L. Qian X. B. Qu T. Saito T. Y. Saito M. Sakata T. K. Sako J. Shao M. Shibata A. Shiomi T. Shirai H. Sugimoto M. Takita Y. H. Tan N. Tateyama S. Torii H. Tsuchiya S. Udo H. Wang H. R. Wu L. Xue Y. Yamamoto K. Yamauchi Z. Yang A. F. Yuan T. Yuda L. M. Zhai H. M. Zhang J. L. Zhang X. Y. Zhang Y. Zhang Yi Zhang Ying Zhang Zhaxisangzhu X. X. Zhou Department of Physics Hirosaki University Hirosaki 036-8561 Japan Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China Department of Mathematics and Physics Tibet University Lhasa 850000 China Department of Physics Hebei Normal University Shijiazhuang 050016 China Department of Physics Shandong University Jinan 250100 China Institute of Modern Physics SouthWest Jiaotong University Chengdu 610031 China Faculty of Engineering Kanagawa University Yokohama 221-8686 Japan Faculty of Education Utsunomiya University Utsunomiya 321-8505 Japan Department of Physics Konan University Kobe 658-8501 Japan Research Institute for Science and Engineering Waseda University Tokyo 169-8555 Japan Faculty of Engineering Yokohama National University Yokohama 240-8501 Japan Department of Physics Shinshu University Matsumoto 390-8621 Japan Institute for Cosmic Ray Research University of Tokyo Kashiwa 277-8582 Japan Institute of Space and Astronautical Science Japan Aerospace Exploration Agency (ISAS/JAXA) Sagamihara Kanagawa 252-5210 Japan National Center for Space Weather China Meteorological Administration Beijing 100081 China School of Information Science and Engineering Shandong Agriculture University Taian 271018 China Saitama University Saitama 338-8570 Japan National Institute of Informatics Tokyo 101-8430 Japan Sakushin Gakuin University Utsunomiya 321-3295 Japan College of Science China University of Petroleum Qingdao 266555 China Tokyo Metropolitan College of Industrial Technology Tokyo 116-8523 Japan Max-Planck-Institut für Physik München D-80805 Deutschland Escuela de Ciencias Físicas y Nanotechnología Yachay Tech Imbabura 100115 Ecuador College of Industrial Technology Nihon University Narashino 275-8576 Japan Shonan Institute of Technology Fujisawa 251-8511 Japan Japan Atomic Energy Agency Tokai-mu

We analyze the Sun’s shadow observed with the Tibet-III air shower array and find that the shadow’s center deviates northward (southward) from the optical solar disk center in the “away” (“toward”) interplanetary magnetic field (IMF) sector. By comparing with numerical simulations based on the solar magnetic field model, we find that the average IMF strength in the away (toward) sector is 1.54±0.21stat±0.20syst (1.62±0.15stat±0.22syst) times larger than the model prediction. These demonstrate that the observed Sun’s shadow is a useful tool for the quantitative evaluation of the average solar magnetic field.

关键词： Cosmic ray propagation Sun Interplanetary magnetic field Cosmic rays & astroparticles

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Experimental test of the irreducible four-qubit Greenberger-Horne-Zeilinger paradox

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Physical Review A 2017年第3期95卷 030103(R)-030103(R)页

作者： Zu-En Su Wei-Dong Tang Dian Wu Xin-Dong Cai Tao Yang Li Li Nai-Le Liu Chao-Yang Lu Marek Żukowski Jian-Wei Pan Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of China Hefei Anhui 230026 China CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China Key Laboratory of Quantum Information and Quantum Optoelectronic Devices Shanxi Province and Department of Applied Physics of Xi'an Jiaotong University Xi'an 710049 China Institute for Theoretical Physics and Astrophysics Faculty of Mathematics and Informatics University of Gdansk Wita Stwosza 57 80-308 Gdansk Poland

The paradox of Greenberger-Horne-Zeilinger (GHZ) disproves directly the concept of EPR elements of reality, based on the EPR correlations, in an all-versus-nothing way. A three-qubit experimental demonstration of the GHZ paradox was achieved nearly 20 years ago, followed by demonstrations for more qubits. Still, the GHZ contradictions underlying the tests can be reduced to a three-qubit one. We show an irreducible four-qubit GHZ paradox, and report its experimental demonstration. The bound of a three-setting-per-party Bell-GHZ inequality is violated by 7σ. The fidelity of the GHZ state was around 81%, and an entanglement witness reveals a violation of the separability threshold by 19σ.

关键词： Nonlocality Quantum entanglement Quantum foundations Quantum measurements

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ISAR target micro-Doppler feature extraction and recognition method based on PCA and ICA

ISAR target micro-Doppler feature extraction and recognition...

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IET International Radar Conference 2015

作者： Bai, Jinliang Jiang, Zhiye Liu, Jiaqi Gao, Lu Liu, Hongyan Xu, Feng Qin, Peng Li, Hu Chen, Shuyuan Liu, Shengdong National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China

ISBN: (纸本)9781849199940

Micro-Doppler features can be regarded as a unique signature of ISAR targets and provide critical information for target recognition. This paper proposes an ISAR micro-Doppler feature extraction and recognition method based on combination algorithm of principle component analysis (PCA) and independent component analysis (ICA). In order to decrease computation burden, PCA algorithm is first applied to reduce dimension and second order correlation, and then ICA decomposes micro-Doppler represented in time frequency domain into a set of independent basis components, which consist the micro-Doppler feature subspace. Target recognition is transformed to calculate the projection coefficient in the subspace. The experimental results verify the correctness and effectiveness of the proposed method.

关键词： Independent component analysis

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