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Bottom quark energy loss and hadronization with B+ and nuclear modification factors using pp and PbPb collisions at = 5.02 TeV

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Journal of High Energy Physics 2025年第2期2025卷 1-40页

作者： Hayrapetyan, A. Tumasyan, A. Adam, W. Andrejkovic, J. W. Bergauer, T. Chatterjee, S. Damanakis, K. Dragicevic, M. Hussain, P. S. Jeitler, M. Krammer, N. Li, A. Liko, D. Mikulec, I. Schieck, J. Schöfbeck, R. Schwarz, D. Sonawane, M. Templ, S. Waltenberger, W. Wulz, C.-E. Darwish, M. R. Janssen, T. Van Mechelen, P. Breugelmans, N. D’Hondt, J. Dansana, S. De Moor, A. Delcourt, M. Heyen, F. Lowette, S. Makarenko, I. Müller, D. Tavernier, S. Tytgat, M. Van Onsem, G. P. Van Putte, S. Vannerom, D. Bilin, B. Clerbaux, B. Das, A. K. De Lentdecker, G. Evard, H. Favart, L. Gianneios, P. Jaramillo, J. Khalilzadeh, A. Khan, F. A. Lee, K. Mahdavikhorrami, M. Malara, A. Paredes, S. Shahzad, M. A. Thomas, L. Vanden Bemden, M. Vander Velde, C. Vanlaer, P. De Coen, M. Dobur, D. Gokbulut, G. Hong, Y. Knolle, J. Lambrecht, L. Marckx, D. Mota Amarilo, K. Samalan, A. Skovpen, K. Van Den Bossche, N. van der Linden, J. Wezenbeek, L. Benecke, A. Bethani, A. Bruno, G. Caputo, C. De Favereau De Jeneret, J. Delaere, C. Donertas, I. S. Giammanco, A. Guzel, A. O. Jain, Sa. Lemaitre, V. Lidrych, J. Mastrapasqua, P. Tran, T. T. Wertz, S. Alves, G. A. Alves Gallo Pereira, M. Coelho, E. Correia Silva, G. Hensel, C. Menezes De Oliveira, T. Moraes, A. Rebello Teles, P. Soeiro, M. Vilela Pereira, A. Aldá Júnior, W. L. Barroso Ferreira Filho, M. Brandao Malbouisson, H. Carvalho, W. Chinellato, J. Da Costa, E. M. Da Silveira, G. G. De Jesus Damiao, D. Fonseca De Souza, S. Gomes De Souza, R. Macedo, M. Martins, J. Mora Herrera, C. Mundim, L. Nogima, H. Pinheiro, J. P. Santoro, A. Sznajder, A. Thiel, M. Bernardes, C. A. Calligaris, L. Fernandez Perez Tomei, T. R. Gregores, E. M. Maietto Silverio, I. Mercadante, P. G. Novaes, S. F. Orzari, B. Padula, Sandra S. Aleksandrov, A. Antchev, G. Hadjiiska, R. Iaydjiev, P. Misheva, M. Shopova, M. Sultanov, G. Dimitrov, A. Litov, L. Pavlov, B. Petkov, P. Petrov, A. Shumka, E. Keshri, S. Thakur, S. Cheng, T. Javaid, T. Yuan, L. Hu, Z. Liang, Z. Liu, J. Yi, K. Chen, G. M. Chen, H. S. Chen, M. Iemmi, F. Jiang, C. H. Yerevan Physics Institute Yerevan Armenia Yerevan State University Yerevan Armenia Institut für Hochenergiephysik Vienna Austria TU Wien Vienna Austria Universiteit Antwerpen Antwerpen Belgium Institute of Basic and Applied Sciences Faculty of Engineering Arab Academy for Science Technology and Maritime Transport Alexandria Egypt Vrije Universiteit Brussel Brussel Belgium Ghent University Ghent Belgium Université Libre de Bruxelles Bruxelles 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 de Campinas Campinas Brazil Federal University of Rio Grande do Sul Porto Alegre Brazil UFMS Nova Andradina Brazil Universidade Estadual Paulista 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 Instituto De Alta Investigación Universidad de Tarapacá Arica Chile Beihang University Beijing China Department of Physics Tsinghua University Beijing China Nanjing Normal University Nanjing China The University of Iowa Iowa City USA Institute of High Energy Physics Beijing China University of Chinese Academy of Sciences Beijing China China Center of Advanced Science and Technology Beijing China China Spallation Neutron Source Guangdong China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Guangdong Provincial Key Laboratory of Nuclear Science and Guangdong-Hong Kong Joint Laboratory of Quantum Matter South China Normal University Guangzhou China Sun Yat-Sen University Guangzhou China University of Science and Technology of China Hefei China Henan Normal University Xinxiang China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) - Fudan University Shanghai China Zhejiang University Hangzhou Ch

The production cross sections of $$ {\textrm{B}}_{\textrm{s}}^0 $$ and B+ mesons are reported in proton-proton (pp) collisions recorded by the CMS experiment at the CERN LHC with a center-of-mass energy of 5.02 TeV. The data sample corresponds to an integrated luminosity of 302 pb−1. The cross sections are based on measurements of the $$ {\textrm{B}}_{\textrm{s}}^0 $$ → J/ψ(μ+μ−)ϕ(1020)(K+K−) and B+ → J/ψ(μ+μ−)K+ decay channels. Results are presented in the transverse momentum (pT) range 7–50 GeV/c and the rapidity interval |y| < 2.4 for the B mesons. The measured pT-differential cross sections of B+ and $$ {\textrm{B}}_{\textrm{s}}^0 $$ in pp collisions are well described by fixed-order plus next-to-leading logarithm perturbative quantum chromodynamics calculations. Using previous PbPb collision measurements at the same nucleon-nucleon center-of-mass energy, the nuclear modification factors, RAA, of the B mesons are determined. For pT > 10 GeV/c, both mesons are found to be suppressed in PbPb collisions (with RAA values significantly below unity), with less suppression observed for the $$ {\textrm{B}}_{\textrm{s}}^0 $$ mesons. In this pT range, the RAA values for the B+ mesons are consistent with those for inclusive charged hadrons and D0 mesons. Below 10 GeV/c, both B+ and $$ {\textrm{B}}_{\textrm{s}}^0 $$ are found to be less suppressed than either inclusive charged hadrons or D0 mesons, with the $$ {\textrm{B}}_{\textrm{s}}^0 $$ RAA value consistent with unity. The RAA values found for the B+ and $$ {\textrm{B}}_{\textrm{s}}^0 $$ are compared to theoretical calculations, providing constraints on the mechanism of bottom quark energy loss and hadronization in the quark-gluon plasma, the hot and dense matter created in ultrarelativistic heavy ion collisions.

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Constraints on Lightly Ionizing Particles from CDMSlite

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Physical Review Letters 2021年第8期127卷 081802-081802页

作者： I. Alkhatib D. W. P. Amaral T. Aralis T. Aramaki I. J. Arnquist I. Ataee Langroudy E. Azadbakht S. Banik D. Barker C. Bathurst D. A. Bauer L. V. S. Bezerra R. Bhattacharyya M. A. Bowles P. L. Brink R. Bunker B. Cabrera R. Calkins R. A. Cameron C. Cartaro D. G. Cerdeño Y.-Y. Chang M. Chaudhuri R. Chen N. Chott J. Cooley H. Coombes J. Corbett P. Cushman F. De Brienne M. L. di Vacri M. D. Diamond E. Fascione E. Figueroa-Feliciano C. W. Fink K. Fouts M. Fritts G. Gerbier R. Germond M. Ghaith S. R. Golwala H. R. Harris B. A. Hines M. I. Hollister Z. Hong E. W. Hoppe L. Hsu M. E. Huber V. Iyer D. Jardin A. Jastram V. K. S. Kashyap M. H. Kelsey A. Kubik N. A. Kurinsky R. E. Lawrence A. Li B. Loer E. Lopez Asamar P. Lukens D. B. MacFarlane R. Mahapatra V. Mandic N. Mast A. J. Mayer H. Meyer zu Theenhausen É. M. Michaud E. Michielin N. Mirabolfathi B. Mohanty J. D. Morales Mendoza S. Nagorny J. Nelson H. Neog V. Novati J. L. Orrell S. M. Oser W. A. Page R. Partridge R. Podviianiuk F. Ponce S. Poudel A. Pradeep M. Pyle W. Rau E. Reid R. Ren T. Reynolds A. Roberts A. E. Robinson T. Saab B. Sadoulet J. Sander A. Sattari R. W. Schnee S. Scorza B. Serfass D. J. Sincavage C. Stanford J. Street D. Toback R. Underwood S. Verma A. N. Villano B. von Krosigk S. L. Watkins J. S. Wilson M. J. Wilson J. Winchell D. H. Wright S. Yellin B. A. Young T. C. Yu E. Zhang H. G. Zhang X. Zhao L. Zheng Department of Physics University of Toronto Toronto Ontario M5S 1A7 Canada Department of Physics Durham University Durham DH1 3LE United Kingdom Division of Physics Mathematics & Astronomy California Institute of Technology Pasadena California 91125 USA SLAC National Accelerator Laboratory/Kavli Institute for Particle Astrophysics and Cosmology Menlo Park California 94025 USA Pacific Northwest National Laboratory Richland Washington D.C. 99352 USA Department of Physics and Astronomy and the Mitchell Institute for Fundamental Physics and Astronomy Texas A&M University College Station Texas 77843 USA School of Physical Sciences National Institute of Science Education and Research HBNI Jatni—752050 India School of Physics & Astronomy University of Minnesota Minneapolis Minnesota 55455 USA Department of Physics University of Florida Gainesville Florida 32611 USA Fermi National Accelerator Laboratory Batavia Illinois 60510 USA Department of Physics & Astronomy University of British Columbia Vancouver British Columbia V6T 1Z1 Canada TRIUMF Vancouver British Columbia V6T 2A3 Canada Department of Physics South Dakota School of Mines and Technology Rapid City South Dakota 57701 USA Department of Physics Stanford University Stanford California 94305 USA Department of Physics Southern Methodist University Dallas Texas 75275 USA Instituto de Física Teórica UAM/CSIC Universidad Autónoma de Madrid 28049 Madrid Spain Department of Physics & Astronomy Northwestern University Evanston Illinois 60208-3112 USA Department of Physics Queen’s University Kingston Ontario K7L 3N6 Canada Département de Physique Université de Montréal Montréal Quebec H3C 3J7 Canada Department of Physics University of California Berkeley California 94720 USA Department of Electrical and Computer Engineering Texas A&M University College Station Texas 77843 USA Department of Physics University of Colorado Denver Denver Colorado 80217 USA Department of Electrical Engineering

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−2 s−1 sr−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 nonrelativistic LIPs with βγ as small as 0.1 for the first time.

关键词： Charge Extensions of fermion sector Particle dark matter Quantum electrodynamics Dark matter detectors

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Local inversion-free estimation of spatial Gaussian processes∗,†

arXiv

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arXiv 2018年

作者： Keshavarz, Hossein Nguyen, XuanLong Scott, Clayton Institute for Mathematics and its Applications University of Minnesota Minneapolis Department of Statistics University of Michigan Ann Arbor United States Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor United States

Maximizing the likelihood has been widely used for estimating the unknown covariance parameters of spatial Gaussian processes. However, evaluating and optimizing the likelihood function can be computationally intractable, particularly for large number of (possibly) irregularly spaced observations, due to the need to handle the inverse of ill-conditioned and large covariance matrices. Extending the "inversion-free" method of Anitescu, Chen and Stein [1], we investigate a broad class of covariance parameter estimation based on inversion-free surrogate losses and block diagonal approximation schemes of the covariance structure. This class of estimators yields a spectrum for negotiating the trade-off between statistical accuracy and computational cost. We present fixed-domain asymptotic properties of our proposed method, establishing √n-consistency and asymptotic normality results for isotropic Matern Gaussian processes observed on a multi-dimensional and irregular lattice. Simulation studies are also presented for assessing the scalability and statistical efficiency of the proposed algorithm for large data *** Codes Primary 62M30, 62M40, secondary 60G15 Copyright © 2018, The Authors. All rights reserved.

关键词： Asymptotic analysis

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Deep learning with quantized neural networks for gravitational wave forecasting of eccentric compact binary coalescence

arXiv

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arXiv 2020年

作者： Wei, Wei Huerta, E.A. Yun, Mengshen Loutrel, Nicholas Shaikh, Md Arif Kumar, Prayush Haas, Roland Kindratenko, Volodymyr National Center for Supercomputing Applications University of Illinois at Urbana-Champaign UrbanaIL61801 United States NCSA Center for Artificial Intelligence Innovation University of Illinois at Urbana-Champaign UrbanaIL61801 United States Department of Physics University of Illinois at Urbana-Champaign UrbanaIL61801 United States Data Science and Learning Division Argonne National Laboratory LemontIL60439 United States University of Chicago ChicagoIL60637 United States Department of Astronomy University of Illinois at Urbana-Champaign UrbanaIL61801 United States Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign UrbanaIL61801 United States Department of Physics Princeton University PrincetonNJ08544 United States Princeton Gravity Initiative Princeton University PrincetonNJ08544 United States International Centre for Theoretical Sciences Tata Institute of Fundamental Research Bangalore560089 India Cornell Center for Astrophysics and Planetary Science Cornell University IthacaNY14853 United States Department of Computer Science University of Illinois at Urbana-Champaign UrbanaIL61801 United States

We present the first application of deep learning forecasting for binary neutron stars, neutron star-black hole systems, and binary black hole mergers that span an eccentricity range e ≤ 0.9. We train neural networks that describe these astrophysical populations, and then test their performance by injecting simulated eccentric signals in advanced LIGO noise available at the Gravitational Wave Open Science Center to: 1) quantify how fast neural networks identify these signals before the binary components merge;2) quantify how accurately neural networks estimate the time to merger once gravitational waves are identified;and 3) estimate the time-dependent sky localization of these events from early detection to merger. Our findings show that deep learning can identify eccentric signals from a few seconds (for binary black holes) up to tens of seconds (for binary neutron stars) prior to merger. A quantized version of our neural networks achieves 4x reduction in model size, and up to 2.5x inference speed up. These novel algorithms may be used to facilitate time-sensitive multi-messenger astrophysics observations of compact binaries in dense stellar environments. Copyright © 2020, The Authors. All rights reserved.

关键词： Gravity waves

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Erratum: Towards a muon collider

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The European Physical Journal C 2024年第1期84卷 1-4页

作者： Accettura, Carlotta Adams, Dean Agarwal, Rohit Ahdida, Claudia Aimè, Chiara Amapane, Nicola Amorim, David Andreetto, Paolo Anulli, Fabio Appleby, Robert Apresyan, Artur Apyan, Aram Arsenyev, Sergey Asadi, Pouya Mahmoud, Mohammed Attia Azatov, Aleksandr Back, John Balconi, Lorenzo Bandiera, Laura Barlow, Roger Bartosik, Nazar Barzi, Emanuela Batsch, Fabian Bauce, Matteo Berg, J. Scott Bersani, Andrea Bertarelli, Alessandro Bertolin, Alessandro Black, Kevin Boattini, Fulvio Bogacz, Alex Bonesini, Maurizio Bordini, Bernardo Bottaro, Salvatore Bottura, Luca Braghieri, Alessandro Breschi, Marco Bruhwiler, Natalie Buffat, Xavier Buonincontri, Laura Burrows, Philip N. Burt, Graeme Buttazzo, Dario Caiffi, Barbara Calviani, Marco Calzaferri, Simone Calzolari, Daniele Capdevilla, Rodolfo Carli, Christian Casaburo, Fausto Casarsa, Massimo Castelli, Luca Catanesi, Maria Gabriella Cavallucci, Lorenzo Cavoto, Gianluca Celiberto, Francesco Giovanni Celona, Luigi Cerri, Alessandro Cesarini, Gianmario Cesarotti, Cari Chachamis, Grigorios Chance, Antoine Chen, Siyu Chien, Yang-Ting Chiesa, Mauro Colaleo, Anna Collamati, Francesco Collazuol, Gianmaria Costa, Marco Craig, Nathaniel Curatolo, Camilla Curtin, David Da Molin, Giacomo Dam, Magnus Damerau, Heiko Dasu, Sridhara de Blas, Jorge De Curtis, Stefania De Matteis, Ernesto De Rosa, Stefania Delahaye, Jean-Pierre Denisov, Dmitri Denizli, Haluk Densham, Christopher Dermisek, Radovan Di Luzio, Luca Di Meco, Elisa Di Micco, Biagio Dienes, Keith Diociaiuti, Eleonora Dorigo, Tommaso Dudarev, Alexey Edgecock, Robert Errico, Filippo Fabbrichesi, Marco Farinon, Stefania Ferrari, Anna Somoza, Jose Antonio Ferreira Filthaut, Frank Fiorina, Davide Fol, Elena Forslund, Matthew Franceschini, Roberto Ximenes, Rui Franqueira Gabrielli, Emidio Gallinaro, Michele Garosi, Francesco Giambastiani, Luca Gianelle, Alessio Gilardoni, Simone Giove, Dario Augusto Giraldin, Carlo Glioti, Alfredo Greco, Mario Greljo, Admir Groeber, Ramona Grojean, Christophe Grudiev, Alexej Gu, Jiayin Han, Chengcheng Han, T Organisation Européenne pour la Recherche Nucléaire (CERN) Geneva Switzerland STFC Rutherford Appleton Laboratory (RAL) Oxford UK Computer Science Department University of California (UC) Berkeley USA Dipartimento di Fisica Università di Pavia Pavia Italy INFN Sezione di Pavia Pavia Italy INFN Sezione di Torino Turin Italy Dipartimento di Fisica Università di Torino Turin Italy INFN Sezione di Padova Padua Italy INFN Sezione di Roma Rome Italy School of Physics and Astronomy University of Manchester Manchester UK Fermi National Accelerator Laboratory Batavia USA Department of Physics Brandeis University Waltham USA IRFU CEA University Paris-Saclay Gif-sur-Yvette France Center for Theoretical Physics Massachusetts Institute of Technology Cambridge USA Center for High Energy Physics (CHEP-FU) Fayoum University El-Fayoum Egypt SISSA International School for Advanced Studies Trieste Italy INFN Sezione di Trieste Trieste Italy Department of Physics University of Warwick Coventry UK Dipartimento di Fisica Università di Milano Milan Italy INFN Laboratori Acceleratori e Superconduttività Applicata (LASA) Milan Italy INFN Sezione di Ferrara Ferrara Italy School of Computing and Engineering The University of Huddersfield Huddersfield UK Ohio State University Columbus USA Brookhaven National Laboratory Upton USA INFN Sezione di Genova Genoa Italy University of Wisconsin Wisconsin USA Center for Advanced Studies of Accelerators Jefferson Lab Newport News USA INFN Sezione di Milano Bicocca Milan Italy Dipartimento di Fisica Università di Milano Bicocca Milan Italy Scuola Normale Superiore Pisa Italy INFN Sezione di Pisa Pisa Italy Dipartimento di Ingegneria dell’Energia Elettrica e dell’Informazione Università di Bologna Bologna Italy INFN Sezione di Bologna Bologna Italy Department of Physics University of California (UC) Berkeley USA Dipartimento di Fisica e Astronomia Università di Padova Padoa Italy John Adams Institute University of O

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Topological nonlinear anomalous nernst effect in strained transition metal dichalcogenides

arXiv

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arXiv 2019年

作者： Yu, Xiao-Qin Zhu, Zhen-Gang You, Jhih-Shih Low, Tony Su, Gang School of Physics and Electronics Hunan University Changsha410082 China School of Electronic Electrical and Communication Engineering University of Chinese Academy of Sciences Beijing100049 China Theoretical Condensed Matter Physics and Computational Materials Physics Laboratory College of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China Institute for Theoretical Solid State Physics IFW Dresden Helmholtzstr. 20 Dresden01069 Germany Department of Electrical and Computer Engineering University of Minnesota MinneapolisMN55455 United States Kavli Institute of Theoretical Sciences University of Chinese Academy of Sciences Beijing100049 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China

We theoretically analyze the non-linear anomalous Nernst effect as the second-order response of temperature gradient by using the semiclassical framework of electron dynamics. We find that a non-linear current can be generated transverse to the applied temperature gradient in time-reversal-symmetry materials with broken inversion symmetry. This effect has a quantum origin arising from the Berry curvature of states near the Fermi surface. We discuss the non-linear Nernst effect in transition metal dichalcogenides (TMDCs) under the application of uniaxial strain. In particular, we predict that under fixed chemical potential in TMDCs, the non-linear Nernst current exhibits a transition from T−2 temperature dependence in low temperature regime to a linear T-dependence in high temperature. Copyright © 2019, The Authors. All rights reserved.

关键词： Transition metals

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Nonresonant central exclusive production of charged-hadron pairs in proton-proton collisions at s=13 TeV

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Physical Review D 2024年第11期109卷 112013-112013页

作者： A. Hayrapetyan A. Tumasyan W. Adam J. W. Andrejkovic T. Bergauer S. Chatterjee K. Damanakis M. Dragicevic P. S. Hussain M. Jeitler N. Krammer A. Li D. Liko I. Mikulec J. Schieck R. Schöfbeck D. Schwarz M. Sonawane S. Templ W. Waltenberger C.-E. Wulz M. R. Darwish T. Janssen P. Van Mechelen E. S. Bols J. D’Hondt S. Dansana A. De Moor M. Delcourt H. El Faham S. Lowette I. Makarenko D. Müller A. R. Sahasransu S. Tavernier M. Tytgat G. P. Van Onsem S. Van Putte D. Vannerom B. Clerbaux A. K. Das G. De Lentdecker L. Favart P. Gianneios D. Hohov J. Jaramillo A. Khalilzadeh K. Lee M. Mahdavikhorrami A. Malara S. Paredes L. Pétré N. Postiau L. Thomas M. Vanden Bemden C. Vander Velde P. Vanlaer M. De Coen D. Dobur Y. Hong J. Knolle L. Lambrecht G. Mestdach K. Mota Amarilo C. Rendón A. Samalan K. Skovpen N. Van Den Bossche J. van der Linden L. Wezenbeek A. Benecke A. Bethani G. Bruno C. Caputo C. Delaere I. S. Donertas A. Giammanco K. Jaffel Sa. Jain V. Lemaitre J. Lidrych P. Mastrapasqua K. Mondal T. T. Tran S. Wertz G. A. Alves E. Coelho C. Hensel T. Menezes De Oliveira A. Moraes P. Rebello Teles M. Soeiro 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 S. Fonseca De Souza R. Gomes De Souza J. Martins C. Mora Herrera L. Mundim H. Nogima J. P. Pinheiro A. Santoro A. Sznajder M. Thiel A. Vilela Pereira C. A. Bernardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores P. G. Mercadante S. F. Novaes B. Orzari Sandra S. Padula A. Aleksandrov R. Hadjiiska P. Iaydjiev M. Misheva M. Shopova G. Sultanov A. Dimitrov L. Litov B. Pavlov P. Petkov A. Petrov E. Shumka S. Keshri S. Thakur T. Cheng Q. Guo T. Javaid L. Yuan Z. Hu J. Liu K. Yi G. M. Chen H. S. Chen M. Chen F. Iemmi C. H. Jiang A. Kapoor H. Liao Z.-A. Liu R. Sharma J. N. Song J. Tao C. Wang J. Wang Z. Wang H. Zhang A. Agapitos Y. Ban A. Levin C. Li Q. Li Y. Mao S. J. Qian X. Sun D. Wang H. Yang L. Zhang C. Zhou Z. You N. Lu G. Bauer X. Gao D. Leggat Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Vienna Austria Indian Institute of Technology Madras Madras India 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 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 Instituto De Alta Investigación Universidad de Tarapacá Casilla 7 D Arica Chile Beihang University Beijing China Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China California Institute of Technology Pasadena California USA 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 University of Science and Technology of China Hefei China Nanjing Normal University Nanjing China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE)—Fudan University Shanghai China Zhejiang University Hangzhou 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

The central exclusive production of charged-hadron pairs in pp collisions at a center-of-mass energy of 13 TeV is examined, based on data collected in a special high-β* run of the LHC. The nonresonant continuum processes are studied with the invariant mass of the centrally produced two-pion system in the resonance-free region, mπ+π−<0.7 or mπ+π−>1.8 GeV. Differential cross sections as functions of the azimuthal angle between the surviving protons, squared exchanged four-momenta, and mπ+π− are measured in a wide region of scattered proton transverse momenta, between 0.2 and 0.8 GeV, and for pion rapidities |y|<2. A rich structure of interactions related to double-pomeron exchange is observed. A parabolic minimum in the distribution of the two-proton azimuthal angle is observed for the first time. It can be interpreted as an effect of additional pomeron exchanges between the protons from the interference between the bare and the rescattered amplitudes. After model tuning, various physical quantities are determined that are related to the pomeron cross section, proton-pomeron and meson-pomeron form factors, pomeron trajectory and intercept, and coefficients of diffractive eigenstates of the proton.

关键词： Particle interactions Hadrons Hadron colliders

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Light‐Emitting Transistors: Multioperation‐Mode Light‐Emitting Field‐Effect Transistors Based on van der Waals Heterostructure (Adv. Mater. 43/2020)

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Advanced Materials 2020年第43期32卷

作者： Junyoung Kwon June‐Chul Shin Huije Ryu Jae Yoon Lee Dongjea Seo Kenji Watanabe Takashi Taniguchi Young Duck Kim James Hone Chul‐Ho Lee Gwan‐Hyoung Lee Department of Materials Science and Engineering Yonsei University Seoul 03722 Korea Department of Materials Science and Engineering Seoul National University Seoul 08826 Korea KU‐KIST Graduate School of Converging Science and Technology Korea University Seoul 02841 Korea Department of Electrical and Computer Engineering University of Minnesota Minneapolis Minnesota 55455 USA Research Center for Functional Materials National Institute for Materials Science 1‐1 Namiki Tsukuba 305‐0044 Japan International Center for Materials Nanoarchitectonics National Institute for Materials Science 1‐1 Namiki Tsukuba 305‐0044 Japan Department of Physics Kyung Hee University Seoul 02447 Korea Department of Mechanical Engineering Columbia University New York NY 10027 USA Research Institute of Advanced Materials (RIAM) Institute of Engineering Research Institute of Applied Physics Seoul National University Seoul 08826 Korea

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Statistically-informed deep learning for gravitational wave parameter estimation

arXiv

引用

arXiv 2019年

作者： Shen, Hongyu Huerta, E.A. O'Shea, Eamonn Kumar, Prayush Zhao, Zhizhen Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign UrbanaIL61801 United States Coordinated Science Laboratory University of Illinois at Urbana-Champaign UrbanaIL61801 United States Data Science and Learning Division Argonne National Laboratory LemontIL60439 United States Department of Computer Science University of Chicago ChicagoIL60637 United States Cornell Center for Astrophysics and Planetary Science Cornell University IthacaNY14853 United States International Centre for Theoretical Sciences Tata Institute of Fundamental Research Bangalore560089 India National Center for Supercomputing Applications University of Illinois at Urbana-Champaign UrbanaIL61801 United States

We introduce deep learning models to estimate the masses of the binary components of black hole mergers, (m1,m2), and three astrophysical properties of the post-merger compact remnant, namely, the final spin, af, and the frequency and damping time of the ringdown oscillations of the fundamental = m = 2 bar mode, (ωR,ωI). Our neural networks combine a modified WaveNet architecture with contrastive learning and normalizing flow. We validate these models against a Gaussian conjugate prior family whose posterior distribution is described by a closed analytical expression. Upon confirming that our models produce statistically consistent results, we used them to estimate the astrophysical parameters (m1,m2,af,ωR,ωI) of five binary black holes: GW150914, GW170104, GW170814, GW190521 and GW190630. We use PyCBC Inference to directly compare traditional Bayesian methodologies for parameter estimation with our deep learning based posterior distributions. Our results show that our neural network models predict posterior distributions that encode physical correlations, and that our data-driven median results and 90% confidence intervals are similar to those produced with gravitational wave Bayesian analyses. This methodology requires a single V100 NVIDIA GPU to produce median values and posterior distributions within two milliseconds for each event. This neural network, and a tutorial for its use, are available at the Data and Learning Hub for *** Codes 68T01, 68T35, 83C35, 83C57 Copyright © 2019, The Authors. All rights reserved.

关键词： Astrophysics

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Giant perpendicular exchange bias in a sub-nanometer inverted (Co/ Pt)n/Co/IrMn structure.

Giant perpendicular exchange bias in a sub-nanometer inverte...

引用

International Conference on Magnetics (INTERMAG)

作者： J. Feng H. Wei H. Liu X. Zhang Y. Ren X. Li J. Wang X. Han Institute of Physics Chinese Academy of Sciences Beijing China Department of Physics and Quantum Theory Project University of Florida Gainesville American Samoa Academy of Engineering Physics Institute of Nuclear Physics and Chemistry Mianyang China The Center for Micromagnetics and Information Technologies (MINT) and Department of Electrical and Computer Engineering University of Minnesota 200 Union St SE Minneapolis Minnesota United States

The phenomenon of exchange coupling has become major research area since its discovery [1] and was extensively studied in various ferrromagnet (FM) - antiferromagnet (AFM) systems in the presence of spintronics [2-4], which usually occurs in a FM/AFM bilayer [1-4]. A large exchange bias field (H ex ) at room temperature is preferred, but perpendicular magnetic anisotropy is found to be more desirable due to a high thermal stability for various spintronic devices. In our work [5], we report a giant perpendicular exchange bias H ex per exhibited in the R-H curves of an inverted (Co/Pt) n /Co/IrMn multi layer and an inverted (Co/Pt) n /Co/Cu/(Co/Pt) 4 /Co/IrMn spin valve structure, in which the Pt layers are only 114 nm in thickness and less than Co layers. H ex per has an unusual linear scaling with the repetition n+1 of the (Co/Pt) n /Co free layer, with its maximum value near the order of 1000 Oe for n+1 = 9. The in-plane exchange bias H ex in is almost constant. The origin of exchange bias in inverted spin valve structure is due to Co/IrMn interfacial magnetic coupling in inverted (Co/Pt) 4 /Co/IrMn reference layer, which is magnified by the exchange coupling between the interface Co layer and the multilayer (Co/Pt) n (n = 4 for the spin valve structures) in the reference stack. As shown Figure 1, giant conventional and pseudo H ex per in the perpendicular inverted (Co/Pt) n /Co spin valves enhances their roles in perpendicular spintronic devices.

关键词： Magnetics Conferences

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