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Odderon Exchange from Elastic Scattering Differences between pp and pp¯ Data at 1.96 TeV and from pp Forward Scattering Measurements

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Physical Review Letters 2021年第6期127卷 062003-062003页

作者： V. M. Abazov B. Abbott B. S. Acharya M. Adams T. Adams J. P. Agnew G. D. Alexeev G. Alkhazov A. Alton G. A. Alves G. Antchev A. Askew P. Aspell A. C. S. Assis Jesus I. Atanassov S. Atkins K. Augsten V. Aushev Y. Aushev V. Avati C. Avila F. Badaud J. Baechler L. Bagby C. Baldenegro Barrera B. Baldin D. V. Bandurin S. Banerjee E. Barberis P. Baringer J. Barreto J. F. Bartlett U. Bassler V. Bazterra A. Bean M. Begalli L. Bellantoni V. Berardi S. B. Beri G. Bernardi R. Bernhard M. Berretti I. Bertram M. Besançon R. Beuselinck P. C. Bhat S. Bhatia V. Bhatnagar G. Blazey S. Blessing K. Bloom A. Boehnlein D. Boline E. E. Boos V. Borchsh G. Borissov M. Borysova E. Bossini U. Bottigli M. Bozzo A. Brandt O. Brandt M. Brochmann R. Brock A. Bross D. Brown X. B. Bu M. Buehler V. Buescher V. Bunichev S. Burdin H. Burkhardt C. P. Buszello F. S. Cafagna E. Camacho-Pérez W. Carvalho B. C. K. Casey H. Castilla-Valdez M. G. Catanesi S. Caughron S. Chakrabarti K. M. Chan A. Chandra E. Chapon G. Chen S. W. Cho S. Choi B. Choudhary S. Cihangir D. Claes J. Clutter M. Cooke W. E. Cooper M. Corcoran F. Couderc M.-C. Cousinou M. Csanád T. Csörgő J. Cuth D. Cutts H. da Motta A. Das G. Davies M. Deile S. J. de Jong E. De La Cruz-Burelo F. De Leonardis F. Déliot R. Demina D. Denisov S. P. Denisov C. De Oliveira Martins S. Desai C. Deterre K. DeVaughan H. T. Diehl M. Diesburg P. F. Ding A. Dominguez M. Doubek A. Drutskoy D. Druzhkin A. Dubey L. V. Dudko A. Duperrin S. Dutt M. Eads D. Edmunds K. Eggert J. Ellison V. D. Elvira Y. Enari V. Eremin H. Evans A. Evdokimov V. N. Evdokimov A. Fauré L. Feng T. Ferbel F. Ferro F. Fiedler A. Fiergolski F. Filthaut W. Fisher H. E. Fisk L. Forthomme M. Fortner H. Fox J. Franc S. Fuess P. H. Garbincius F. Garcia A. Garcia-Bellido J. A. García-González V. Gavrilov W. Geng V. Georgiev C. E. Gerber Y. Gershtein S. Giani G. Ginther O. Gogota G. Golovanov P. D. Grannis S. Greder H. Greenlee G. Grenier Ph. Gris J.-F. Grivaz A. Grohsjean S. Grünendahl M. W. Grünewald L. Grzanka T. Guillemin G. Gutierrez P. Gutierr Joint Institute for Nuclear Research Dubna 141980 Russia University of Oklahoma Norman Oklahoma 73019 USA Tata Institute of Fundamental Research Mumbai-400 005 India University of Illinois at Chicago Chicago Illinois 60607 USA Florida State University Tallahassee Florida 32306 USA The University of Manchester Manchester M13 9PL United Kingdom Petersburg Nuclear Physics Institute St. Petersburg 188300 Russia University of Michigan Ann Arbor Michigan 48109 USA LAFEX Centro Brasileiro de Pesquisas Físicas Rio de Janeiro RJ 22290 Brazil INRNE-BAS Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences 1784 Sofia Bulgaria CERN 1211 Geneva 23 Switzerland Universidade do Estado do Rio de Janeiro Rio de Janeiro RJ 20550 Brazil Louisiana Tech University Ruston Louisiana 71272 USA Czech Technical University in Prague 116 36 Prague 6 Czech Republic Taras Shevchenko National University of Kyiv Kiev 01601 Ukraine AGH University of Science and Technology 30-059 Krakow Poland Universidad de los Andes Bogotá 111711 Colombia LPC Université Blaise Pascal CNRS/IN2P3 Clermont F-63178 Aubière Cedex France Fermi National Accelerator Laboratory Batavia Illinois 60510 USA University of Kansas Lawrence Kansas 66045 USA University of Virginia Charlottesville Virginia 22904 USA Northeastern University Boston Massachusetts 02115 USA IRFU CEA Université Paris-Saclay F-91191 Gif-Sur-Yvette France INFN Sezione di Bari 70126 Bari Italy Dipartimento Interateneo di Fisica di Bari 70126 Bari Italy Panjab University Chandigarh 160014 India LPNHE Universités Paris VI and VII CNRS/IN2P3 F-75005 Paris France Physikalisches Institut Universität Freiburg 79085 Freiburg Germany Helsinki Institute of Physics 00014 University of Helsinki Helsinki Finland Lancaster University Lancaster LA1 4YB United Kingdom Imperial College London London SW7 2AZ United Kingdom University of Mississippi University Mississippi 38677 USA Northern Illinois University

We describe an analysis comparing the pp¯ elastic cross section as measured by the D0 Collaboration at a center-of-mass energy of 1.96 TeV to that in pp collisions as measured by the TOTEM Collaboration at 2.76, 7, 8, and 13 TeV using a model-independent approach. The TOTEM cross sections, extrapolated to a center-of-mass energy of s=1.96 TeV, are compared with the D0 measurement in the region of the diffractive minimum and the second maximum of the pp cross section. The two data sets disagree at the 3.4σ level and thus provide evidence for the t-channel exchange of a colorless, C-odd gluonic compound, also known as the odderon. We combine these results with a TOTEM analysis of the same C-odd exchange based on the total cross section and the ratio of the real to imaginary parts of the forward elastic strong interaction scattering amplitude in pp scattering for which the significance is between 3.4σ and 4.6σ. The combined significance is larger than 5σ and is interpreted as the first observation of the exchange of a colorless, C-odd gluonic compound.

关键词： Diffractive production Hadron-hadron interactions Quantum chromodynamics Strong interaction

W+W− boson pair production in proton-proton collisions at s=13 TeV

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Physical Review D 2020年第9期102卷 092001-092001页

作者： A. M. Sirunyan A. Tumasyan W. Adam F. Ambrogi T. Bergauer M. Dragicevic J. Erö A. Escalante Del Valle R. Frühwirth M. Jeitler N. Krammer L. Lechner D. Liko T. Madlener I. Mikulec F. M. Pitters N. Rad J. Schieck R. Schöfbeck M. Spanring S. Templ W. Waltenberger C.-E. Wulz M. Zarucki V. Chekhovsky A. Litomin V. Makarenko 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 A. Morton 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 I. Makarenko L. Moureaux L. Pétré A. Popov N. Postiau E. Starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom L. Wezenbeek T. Cornelis D. Dobur M. Gruchala I. Khvastunov M. Niedziela C. Roskas K. Skovpen M. Tytgat W. Verbeke B. Vermassen M. Vit G. Bruno F. Bury C. Caputo P. David C. Delaere M. Delcourt I. S. Donertas A. Giammanco V. Lemaitre K. Mondal J. Prisciandaro A. Taliercio M. Teklishyn P. Vischia S. Wuyckens J. Zobec G. A. Alves G. Correia Silva C. Hensel A. Moraes W. L. Aldá Júnior E. Belchior Batista Das Chagas H. Brandao Malbouisson W. Carvalho J. Chinellato E. Coelho E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao S. Fonseca De Souza J. Martins D. Matos Figueiredo M. Medina Jaime M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima P. Rebello Teles L. J. Sanchez Rosas A. Santoro S. M. Silva Do Amaral 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 I. Atanasov 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 Q. Guo H. Wang L. Yuan M. 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 University of Illinois at Chicago (UIC) Chicago Illinois USA Department of Physics Tsinghua University Beijing China University of Virginia Charlottesville Virginia USA Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China The University of Kansas Lawrence Kansas USA 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 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 Center for High Energy Physic

A measurement of the W+W− boson pair production cross section in proton-proton collisions at s=13 TeV is presented. The data used in this study are collected with the CMS detector at the CERN LHC and correspond to an integrated luminosity of 35.9 fb−1. The W+W− candidate events are selected by requiring two oppositely charged leptons (electrons or muons). Two methods for reducing background contributions are employed. In the first one, a sequence of requirements on kinematic quantities is applied allowing a measurement of the total production cross section, 117.6±6.8 pb, which agrees well with the theoretical prediction. Fiducial cross sections are also reported for events with zero or one jet, and the change in the zero-jet fiducial cross section with the jet transverse momentum threshold is measured. Normalized differential cross sections are reported within the fiducial region. A second method for suppressing background contributions employs two random forest classifiers. The analysis based on this method includes a measurement of the total production cross section and also a measurement of the normalized jet multiplicity distribution in W+W− events. Finally, a dilepton invariant mass distribution is used to probe for physics beyond the standard model in the context of an effective field theory, and constraints on the presence of dimension-6 operators are derived.

关键词： W & Z bosons Hadron colliders

First branching fraction measurement of the suppressed decay Ξc0 → π−Λ+c

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arXiv 2020年

作者： Aaij, R. Abellán Beteta, C. Ackernley, T. Adeva, B. Adinolfi, M. Afsharnia, H. Aidala, C.A. Aiola, S. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Aliouche, Z. Alkhazov, G. Alvarez Cartelle, P. Amato, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreianov, A. Andreotti, M. Archilli, F. Artuso, M. Arzymatov, K. Aslanides, E. Atzeni, M. Audurier, B. Bachmann, S. Bachmayer, M. Back, J.J. Baker, S. Baladron Rodriguez, P. Balagura, V. Baldini, W. Baptista Leite, J. Barlow, R.J. Barsuk, S. Barter, W. Bartolini, M. Baryshnikov, F. Basels, J.M. Bassi, G. Batozskaya, V. Batsukh, B. Battig, A. Bay, A. Becker, M. Bedeschi, F. Bediaga, I. Beiter, A. Belavin, V. Belin, S. Bellee, V. Belyaev, I. Bencivenni, G. Ben-Haim, E. Berezhnoy, A. Bernet, R. Berninghoff, D. Bernstein, H.C. Bertella, C. Bertholet, E. Bertolin, A. Betancourt, C. Betti, F. Bettler, M.O. Bezshyiko, Ia Bhasin, S. Bhom, J. Bian, L. Bieker, M.S. Bifani, S. Billoir, P. Birch, M. Bishop, F.C.R. Bizzeti, A. Bjørn, M. Blago, M.P. Blake, T. Blanc, F. Blusk, S. Bobulska, D. Bocci, V. Boelhauve, J.A. Boente Garcia, O. Boettcher, T. Boldyrev, A. Bondar, A. Bondar, N. Borghi, S. Borisyak, M. Borsato, M. Borsuk, J.T. Bouchiba, S.A. Bowcock, T.J.V. Boyer, A. Bozzi, C. Bradley, M.J. Braun, S. Brea Rodriguez, A. Brodski, M. Brodzicka, J. Brossa Gonzalo, A. Brundu, D. Buonaura, A. Burr, C. Bursche, A. Butkevich, A. Butter, J.S. Buytaert, J. Byczynski, W. Cadeddu, S. Cai, H. Calabrese, R. Calero Diaz, L. Cali, S. Calladine, R. Calvi, M. Calvo Gomez, M. Camargo Magalhaes, P. Camboni, A. Campana, P. Campora Perez, D.H. Campoverde Quezada, A.F. Capelli, S. Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carli, I. Carniti, P. Carvalho Akiba, K. Casais Vidal, A. Casse, G. Cattaneo, M. Cavallero, G. Celani, S. Cenci, R. Cerasoli, J. Chadwick, A.J. Chapman, M.G. Charles, M. Charpentier, Ph Chatzikonstantinidis, G. Chefdeville, M. Chen, C. Chen, S. Chernov, A. Rio de Janeiro Brazil Rio de Janeiro Brazil Center for High Energy Physics Tsinghua University Beijing China School of Physics State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China University of Chinese Academy of Sciences Beijing China Beijing China Institute of Particle Physics Central China Normal University WuhanHubei China Univ. Grenoble Alpes Univ. Savoie Mont Blanc CNRS IN2P3-LAPP Annecy France Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France Université Paris-Saclay CNRS/IN2P3 IJCLab Orsay France LPNHE Sorbonne Université Paris Diderot Sorbonne Paris Cité CNRS/IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland INFN Sezione di Bari Bari Italy INFN Sezione di Bologna Bologna Italy INFN Sezione di Ferrara Ferrara Italy INFN Sezione di Firenze Firenze Italy INFN Laboratori Nazionali di Frascati Frascati Italy INFN Sezione di Genova Genova Italy INFN Sezione di Milano-Bicocca Milano Italy INFN Sezione di Milano Milano Italy INFN Sezione di Cagliari Monserrato Italy Universita degli Studi di Padova Universita e INFN Padova Padova Italy INFN Sezione di Pisa Pisa Italy INFN Sezione di Roma Tor Vergata Roma Italy INFN Sezione di Roma La Sapienza Roma Italy Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Nikhef National Institute for Subatomic Physics VU University Amsterdam Amsterdam Netherlands Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland AGH - University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Warsaw Poland Horia Hulubei National Institute of P

The Ξc0 baryon is unstable and usually decays into charmless final states by the c → sud transition. It can, however, also disintegrate into a π− meson and a Λ+c baryon via s quark decay or via cs → dc weak scattering. The interplay between the latter two processes governs the size of the branching fraction B(Ξc0 → π−Λ+c ), first measured here to be (0.55 ± 0.02 ± 0.18)%, where the first uncertainty is statistical and second systematic. This result is compatible with the larger of the theoretical predictions that connect models of hyperon decays using partially conserved axial currents and SU(3) symmetry with those involving the heavy-quark expansion and heavy-quark symmetry. In addition, the branching fraction of the normalization channel, B(Ξc+ → pK−π+) = (1.135 ± 0.002 ± 0.387)% is measured. Copyright © 2020, The Authors. All rights reserved.

关键词： Hadrons

Emerging 2D Gauge theories in Rydberg configurable arrays

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arXiv 2019年

作者： Celi, Alessio Vermersch, Benoît Viyuela, Oscar Pichler, Hannes Lukin, Mikhail D. Zoller, Peter Center for Quantum Physics Faculty of Mathematics Computer Science and Physics University of Innsbruck InnsbruckA-6020 Austria Institute for Quantum Optics and Quantum Information Austrian Academy of Sciences InnsbruckA-6020 Austria Departament de Física Universitat Autònoma de Barcelona Bellaterra08193 Spain Department of Physics Massachusetts Institute of Technology CambridgeMA02139 United States Department of Physics Harvard University CambridgeMA02318 United States ITAMP Harvard-Smithsonian Center for Astrophysics CambridgeMA02138 United States

Solving strongly coupled gauge theories in two or three spatial dimensions is of fundamental importance in several areas of physics ranging from high-energy physics to condensed matter. On a lattice, gauge invariance and gauge invariant (plaquette) interactions involve (at least) four-body interactions that are challenging to realize. Here we show that Rydberg atoms in configurable arrays realized in current tweezer experiments are the natural platform to realize scalable simulators of the Rokhsar-Kivelson Hamiltonian -a 2D U(1) lattice gauge theory that describes quantum dimer and spin-ice dynamics. Using an electromagnetic duality, we implement the plaquette interactions as Rabi oscillations subject to Rydberg blockade. Remarkably, we show that by controlling the atom arrangement in the array we can engineer anisotropic interactions and generalized blockade conditions for spins built of atom pairs. We describe how to prepare the resonating valence bond and the crystal phases of the Rokhsar-Kivelson Hamiltonian adiabatically, and probe them and their quench dynamics by onsite measurements of their quantum correlations. We discuss the potential applications of our Rydberg simulator to lattice gauge theory and exotic spin models. Copyright © 2019, The Authors. All rights reserved.

关键词： Hamiltonians

Measurement of the top quark Yukawa coupling from tt¯ kinematic distributions in the dilepton final state in proton-proton collisions at s=13 TeV

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Physical Review D 2020年第9期102卷 092013-092013页

作者： A. M. Sirunyan A. Tumasyan W. Adam F. Ambrogi T. Bergauer M. Dragicevic J. Erö A. Escalante Del Valle R. Frühwirth M. Jeitler N. Krammer L. Lechner D. Liko T. Madlener I. Mikulec F. M. Pitters N. Rad J. Schieck R. Schöfbeck M. Spanring S. Templ W. Waltenberger C.-E. Wulz M. Zarucki V. Chekhovsky A. Litomin V. Makarenko 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 A. Morton Q. Python S. Tavernier W. Van Doninck P. Van Mulders D. Beghin B. Bilin B. Clerbaux G. De Lentdecker B. Dorney L. Favart A. Grebenyuk A. K. Kalsi I. Makarenko L. Moureaux L. Pétré A. Popov N. Postiau E. Starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom L. Wezenbeek T. Cornelis D. Dobur M. Gruchala I. Khvastunov M. Niedziela C. Roskas K. Skovpen M. Tytgat W. Verbeke B. Vermassen M. Vit G. Bruno F. Bury C. Caputo P. David C. Delaere M. Delcourt I. S. Donertas A. Giammanco V. Lemaitre K. Mondal J. Prisciandaro A. Taliercio M. Teklishyn P. Vischia S. Wuyckens J. Zobec G. A. Alves G. Correia Silva C. Hensel A. Moraes W. L. Aldá Júnior E. Belchior Batista Das Chagas H. Brandao Malbouisson W. Carvalho J. Chinellato E. Coelho E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao S. Fonseca De Souza J. Martins D. Matos Figueiredo M. Medina Jaime M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima P. Rebello Teles L. J. Sanchez Rosas A. Santoro S. M. Silva Do Amaral 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 I. Atanasov 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 Q. Guo H. Wang L. Yuan M. Ahmad Z. Hu 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 Rutgers The State University of New Jersey Piscataway New Jersey USA Department of Physics Tsinghua University Beijing China University of Virginia Charlottesville Virginia USA Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China The University of Kansas Lawrence Kansas USA 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 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 Center for High Ener

A measurement of the Higgs boson Yukawa coupling to the top quark is presented using proton-proton collision data at s=13 TeV, corresponding to an integrated luminosity of 137 fb−1, recorded with the CMS detector. The coupling strength with respect to the standard model value, Yt, is determined from kinematic distributions in tt¯ final states containing ee, μμ, or eμ pairs. Variations of the Yukawa coupling strength lead to modified distributions for tt¯ production. In particular, the distributions of the mass of the tt¯ system and the rapidity difference of the top quark and antiquark are sensitive to the value of Yt. The measurement yields a best fit value of Yt=1.16−0.35+0.24, bounding Yt<1.54 at a 95% confidence level.

关键词： Higgs bosons Top quark Hadron colliders

Towards lattice quantum chromodynamics on FPGA devices

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arXiv 2018年

作者： Korcyl, Grzegorz Korcyl, Piotr Department of Information Technologies Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University ul. Lojasiewicza 11 Kraków30-348 Poland M. Smoluchowski Institute of Physics Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University ul. Lojasiewicza 11 Kraków30-348 Poland Institut für Theoretische Physik Universität Regensburg Regensburg93040 Germany

In this paper we describe a single-node, double precision FPGA implementation of the Conjugate Gradient algorithm in the context of Lattice Quantum Chromodynamics. As a benchmark of our proposal we invert numerically the Dirac-Wilson operator on a 4-dimensional grid on a Xilinx Zynq Ultrascale+ evaluation board. In our implementation we separate software/hardware parts in such a way that the entire multiplication by the Dirac operator is performed in hardware, and the rest of the algorithm runs on an ARM core. We find out that the FPGA implementation offers a comparable performance with that obtained using current CPU or Intel's many core Xeon Phi accelerators. A possible multiple node FPGA-based system is discussed and we argue that power-efficient HPC systems can be implemented using FPGA devices only. Copyright © 2018, The Authors. All rights reserved.

关键词： Quantum theory

Transverse momentum fluctuations and correlations

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Transverse momentum fluctuations and correlations

作者： Bozek, Piotr Broniowski, Wojciech Chatterjee, Sandeep Faculty of Physics and Applied Computer Science AGH University of Science and Technology Al. Mickiewicza 30 Kraków30-059 Poland H. Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Radzikowskigo 152 Kraków31-342 Poland Institute of Physics Jan Kochanowski University Swietokrzyska 15 Kielce25-406 Poland

We study fluctuations and correlations of the average transverse momentum of particles emitted in heavy-ion collisions. Fluctuations of the average transverse momentum are related to event-by-event fluctuations of the size and entropy of the initial source. Hydrodynamic calculations using a Glauber model with quark degrees of freedom reproduce the data. We study correlations of the average transverse momentum in different rapidity bins. We propose a definition of the observable that can be directly related to correlations of the collective flow variables.

关键词： Heavy ions

The DES Bright Arcs Survey: Candidate Strongly Lensed Galaxy Systems from the Dark Energy Survey 5,000 Sq. Deg. Footprint

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arXiv 2021年

作者： O'Donnell, Jackson H. Wilkinson, R.D. Diehl, H.T. Aros-Bunster, C. Bechtol, K. Birrer, S. Buckley-Geer, E.J. Carnero Rosell, A. Carrasco Kind, M. da Costa, L.N. Gonzalez Lozano, S.J. Gruendl, R.A. Hilton, M. Lin, H. Lindgren, K.A. Martin, J. Pieres, A. Rykoff, E.S. Sevilla-Noarbe, I. Sheldon, E. Sifón, C. Tucker, D.L. Yanny, B. Abbott, T.M.C. Aguena, M. Allam, S. Andrade-Oliveira, F. Annis, J. Bertin, E. Brooks, D. Burke, D.L. Carretero, J. Costanzi, M. de Vicente, J. Desai, S. Dietrich, J.P. Eckert, K. Everett, S. Ferrero, I. Flaugher, B. Fosalba, P. Frieman, J. García-Bellido, J. Gaztanaga, E. Gerdes, D.W. Gruen, D. Gschwend, J. Gill, M.S.S. Gutierrez, G. Hinton, S.R. Hollowood, D.L. Honscheid, K. James, D.J. Jeltema, T. Kuehn, K. Lahav, O. Lima, M. Maia, M.A.G. Marshall, J.L. Melchior, P. Menanteau, F. Miquel, R. Morgan, R. Nord, B. Ogando, R.L.C. Paz-Chinchón, F. Pereira, M.E.S. Plazas Malagón, A.A. Rodriguez-Monroy, M. Romer, A.K. Roodman, A. Sanchez, E. Scarpine, V. Schubnell, M. Serrano, S. Smith, M. Suchyta, E. Swanson, M.E.C. Tarle, G. Thomas, D. To, C. Varga, T.N. Department of Physics University of California at Santa Cruz Santa CruzCA95064 United States Department of Physics and Astronomy Pevensey Building University of Sussex BrightonBN1 9QH United Kingdom Fermi National Accelerator Laboratory P. O. Box 500 BataviaIL60510 United States Instituto de Física Pontificia Universidad Católica de Valparaíso Casilla Valparaíso4059 Chile Physics Department 2320 Chamberlin Hall University of Wisconsin-Madison 1150 University Avenue MadisonWI53706-1390 United States Kavli Institute for Particle Astrophysics & Cosmology Stanford University P. O. Box 2450 StanfordCA94305 United States Department of Physics Stanford University 382 Via Pueblo Mall StanfordCA94305 United States Department of Astronomy and Astrophysics University of Chicago ChicagoIL60637 United States Laboratório Interinstitucional de e-Astronomia - LIneA Rua Gal. José Cristino 77 RJ Rio de Janeiro20921-400 Brazil Observatório Nacional Rua Gal. José Cristino 77 RJ Rio de Janeiro20921-400 Brazil Department of Astronomy University of Illinois at Urbana-Champaign 1002 W. Green Street UrbanaIL61801 United States Center for Astrophysical Surveys National Center for Supercomputing Applications 1205 West Clark St. UrbanaIL61801 United States Astrophysics Research Centre University of KwaZulu-Natal Westville Campus Durban4041 South Africa School of Mathematics Statistics & Computer Science University of KwaZulu-Natal Westville Campus Durban4041 South Africa Brookhaven National Laboratory Bldg 510 UptonNY11973 United States Half Hollow Hills High School East 50 Vanderbilt Pkwy Dix HillsNY11746 United States SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Madrid Spain Cerro Tololo Inter-American Observatory NSF's National Optical-Infrared Astronomy Research Laboratory Casilla 603 La Serena Chile Instituto de Física Teórica Universidade Estadual Paulista São Paulo Brazil CNRS UMR 7095 Institut d'Astrophysiqu

We report the combined results of eight searches for strong gravitational lens systems in the full 5,000 sq. deg. of Dark Energy Survey (DES) observations. The observations accumulated by the end of the third observing season fully covered the DES footprint in 5 filters (grizY), with an i−band limiting magnitude (at10σ) of 23.44. In four searches, a list of potential candidates was identified using a color and magnitude selection from the object catalogs created from the first three observing seasons. Three other searches were conducted at the locations of previously identified galaxy clusters. Cutout images of potential candidates were then visually scanned using an object viewer. An additional set of candidates came from a data-quality check of a subset of the color-coadd "tiles" created from the full DES six-season data set. A short list of the most promising strong lens candidates was then numerically ranked according to whether or not we judged them to be bona fide strong gravitational lens systems. These searches discovered a diverse set of 247 strong lens candidate systems, of which 81 are identified for the first time. We provide the coordinates, magnitudes, and photometric properties of the lens and source objects, and an estimate of the Einstein radius for 81 new systems and 166 previously reported. This catalog will be of use for selecting interesting systems for detailed follow-up, studies of galaxy cluster and group mass profiles, as well as a training/validation set for automated strong lens searches. © 2021, CC BY.

关键词： Galaxies

Activation of computer science teachers in Slovenia 11th

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Activation of computer science teachers in Slovenia

11th IFIP TC 3 World Conference on computers and Education, WCCE 2017

作者： Brodnik, Andrej Lokar, Matija Mori, Nataša Faculty of Computer and Information Science University of Ljubljana Ljubljana Slovenia Department of Information Science and Technology University of Primorska Koper Slovenia Faculty of Mathematics and Physics University of Ljubljana Ljubljana Slovenia

ISBN: (纸本)9783319743097

The paper describes an approach of improving Slovenian computer science Education in general secondary school by forming an active and sustainable computer science Community of Practice (CS CoP). In project NAPOJ three systems teachers use in teaching programming are combined: CS e-textbook, LMS Moodle and TOMO, automatic assessment system for learning programming. Group of master teachers were selected, who prepared the initial set of in-class resources and material at a half a week workshop. This was followed by the regional workshops for other CS teachers throughout the Slovenia and run by master teachers. Development of CoP was observed and analyzed through various data gathering tools, such as questionnaires, discussions and observations, and preliminary results are highlighted. © 2017, IFIP International Federation for Information Processing.

关键词： Surveys