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arXiv 2018年

作者： Park, Pyeongjae Oh, Joosung Uhlířová, Klára Jackson, Jerome Deák, András Szunyogh, László Lee, Ki Hoon Cho, Hwanbeom Kim, Ha-Leem Walker, Helen C. Adroja, Devashibhai Sechovský, Vladimír Park, Je-Geun Center for Correlated Electron Systems Institute for Basic Science Seoul08826 Korea Republic of Department of Physics and Astronomy Seoul National University Kwanak-Gu Seoul08826 Korea Republic of Charles University in Prague Faculty of Mathematics and Physics Ke Karlovu 5 Prague 2121 16 Czech Republic Scientific Computing Department STFC Daresbury Laboratory WarringtonWA4 4AD United Kingdom Department of Theoretical Physics Budapest University of Technology and Economics Budafokiút 8 BudapestH-1111 Hungary MTA-BME Condensed Matter Research Group Budafokiút 8 BudapestH-1111 Hungary ISIS Facility Rutherford Appleton Laboratory DidcotOX11 0QX United Kingdom ISIS Facility Rutherford Appleton Laboratory Chilton Didcot OxonOX11 0QX United Kingdom Highly Correlated Matter Research Group Physics Department University of Johannesburg P.O. Box 524 Auckland Park2006 South Africa

Mn3Sn has recently attracted considerable attention as a magnetic Weyl semimetal exhibiting concomitant transport anomalies at room temperature. The topology of the electronic bands, their relation to the magnetic ground state and their nonzero Berry curvature lie at the heart of the problem. The examination of the full magnetic Hamiltonian reveals otherwise hidden aspects of these unusual physical properties. Here, we report the full spin wave spectra of Mn3Sn measured over a wide momentum - energy range by the inelastic neutron scattering technique. Using a linear spin wave theory, we determine a suitable magnetic Hamiltonian which not only explains the experimental results but also stabilizes the low-temperature helical phase, consistent with our DFT calculations. The effect of this helical ordering on topological band structures is further examined using a tight-binding method, which confirms the elimination of Weyl points in the helical phase. Our work provides a rare example of the intimate coupling between the electronic and spin degrees of freedom for a magnetic Weyl semimetal system. Copyright © 2018, The Authors. All rights reserved.

关键词： Tin alloys

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Mechanisms of self-organized criticality in social processes of knowledge creation

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Physical Review E 2017年第3期96卷 032307-032307页

作者： Bosiljka Tadić Marija Mitrović Dankulov Roderick Melnik Department of Theoretical Physics Jožef Stefan Institute Jamova 39 1000 Ljubljana Slovenia Scientific Computing Laboratory Center for the Study of Complex Systems Institute of Physics Belgrade University of Belgrade Pregrevica 118 11080 Belgrade Serbia MS2Discovery Interdisciplinary Research Institute M2NeT Laboratory and Department of Mathematics Wilfrid Laurier University Waterloo Ontario Canada N2L 3C5

In online social dynamics, a robust scale invariance appears as a key feature of collaborative efforts that lead to new social value. The underlying empirical data thus offers a unique opportunity to study the origin of self-organized criticality (SOC) in social systems. In contrast to physical systems in the laboratory, various human attributes of the actors play an essential role in the process along with the contents (cognitive, emotional) of the communicated artifacts. As a prototypical example, we consider the social endeavor of knowledge creation via Questions and Answers (Q&A). Using a large empirical data set from one of such Q&A sites and theoretical modeling, we reveal fundamental characteristics of SOC by investigating the temporal correlations at all scales and the role of cognitive contents to the avalanches of the knowledge-creation process. Our analysis shows that the universal social dynamics with power-law inhomogeneities of the actions and delay times provides the primary mechanism for self-tuning towards the critical state; it leads to the long-range correlations and the event clustering in response to the external driving by the arrival of new users. In addition, the involved cognitive contents (systematically annotated in the data and observed in the model) exert important constraints that identify unique classes of the knowledge-creation avalanches. Specifically, besides determining a fine structure of the developing knowledge networks, they affect the values of scaling exponents and the geometry of large avalanches and shape the multifractal spectrum. Furthermore, we find that the level of the activity of the communities that share the knowledge correlates with the fluctuations of the innovation rate, implying that the increase of innovation may serve as the active principle of self-organization. To identify relevant parameters and unravel the role of the network evolution underlying the process in the social system under consideration, we com

关键词： Collective behavior in networks Self-organized criticality Social dynamics

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The International Pulsar Timing Array: Second data release

arXiv

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arXiv 2019年

作者： Perera, B.B.P. DeCesar, M.E. Demorest, P.B. Kerr, M. Lentati, L. Nice, D.J. Oslowski, S. Ransom, S.M. Keith, M.J. Arzoumanian, Z. Bailes, M. Baker, P.T. Bassa, C.G. Bhat, N.D.R. Brazier, A. Burgay, M. Burke-Spolaor, S. Caballero, R.N. Champion, D.J. Chatterjee, S. Chen, S. Cognard, I. Cordes, J.M. Crowter, K. Dai, S. Desvignes, G. Dolch, T. Ferdman, R.D. Ferrara, E.C. Fonseca, E. Goldstein, J.M. Graikou, E. Guillemot, L. Hazboun, J.S. Hobbs, G. Hu, H. Islo, K. Janssen, G.H. Karuppusamy, R. Kramer, M. Lam, M.T. Lee, K.J. Liu, K. Luo, J. Lyne, A.G. Manchester, R.N. McKee, J.W. McLaughlin, M.A. Mingarelli, C.M.F. Parthasarathy, A.P. Pennucci, T.T. Perrodin, D. Possenti, A. Reardon, D.J. Russell, C.J. Sanidas, S.A. Sesana, A. Shaifullah, G. Shannon, R.M. Siemens, X. Simon, J. Spiewak, R. Stairs, I.H. Stappers, B.W. Swiggum, J.K. Taylor, S.R. Theureau, G. Tiburzi, C. Vallisneri, M. Vecchio, A. Wang, J.B. Zhang, S.B. Zhang, L. Zhu, W.W. Zhu, X.J. Jodrell Bank Centre for Astrophysics School of Physics and Astronomy University of Manchester ManchesterM13 9PL United Kingdom Arecibo Observatory HC3 Box 53995 AreciboPR 00612 United States Department of Physics Lafayette College EastonPA18042 United States National Radio Astronomy Observatory P.O. Box O SocorroNM87801 United States Space Science Division Naval Research Laboratory WashingtonDC20375-5352 United States Astrophysics Group Cavendish Laboratory JJ Thomson Avenue CambridgeCB3 0HE United Kingdom Centre for Astrophysics and Supercomputing Swinburne University of Technology Post Box 218 HawthornVIC3122 Australia National Radio Astronomy Observatory 520 Edgemont Road CharlottesvilleVA22903 United States Code 662 X-ray Astrophysics Laboratory NASA Goddard Space Flight Center GreenbeltMD20770 United States Department of Physics and Astronomy West Virginia University P.O. Box 6315 MorgantownWV26506 United States Center for Gravitational Waves and Cosmology West Virginia University Chestnut Ridge Research Building MorgantownWV26505 United States ASTRON Netherlands Institute for Radio Astronomy Oude Hoogeveensedijk 4 Dwingeloo7991 PD Netherlands International Centre for Radio Astronomy Research Curtin University BentleyWA6102 Australia Department of Astronomy Cornell Center for Astrophysics and Planetary Science Cornell University IthacaNY14853 United States Cornell Center for Advanced Computing Cornell University IthacaNY14853 United States INAF-Osservatorio Astronomico di Cagliari via della Scienza 5 SelargiusI-09047 Italy Canadian Institute for Advanced Research CIFAR Azrieli Global Scholar MaRS Centre West Tower 661 University Ave. Suite 505 TorontoONM5G 1M1 Canada Kavli Institute for Astronomy and Astrophysics Peking University Beijing100871 China Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 BonnD-53121 Germany Station de radioastronomie de Nançay Observatoire de Paris PSL Research University C

In this paper, we describe the International Pulsar Timing Array second data release, which includes recent pulsar timing data obtained by three regional consortia: the European Pulsar Timing Array, the North American Nanohertz Observatory for Gravitational Waves, and the Parkes Pulsar Timing Array. We analyse and where possible combine high-precision timing data for 65 millisecond pulsars which are regularly observed by these groups. A basic noise analysis, including the processes which are both correlated and uncorrelated in time, provides noise models and timing ephemerides for the pulsars. We find that the timing precisions of pulsars are generally improved compared to the previous data release, mainly due to the addition of new data in the combination. The main purpose of this work is to create the most up-to-date IPTA data release. These data are publicly available for searches for low-frequency gravitational waves and other pulsar science. Copyright © 2019, The Authors. All rights reserved.

关键词： Pulsars

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Heavy physics contributions to neutrinoless double beta decay from QCD

arXiv

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arXiv 2018年

作者： Nicholson, A. Berkowitz, E. Monge-Camacho, H. Brantley, D. Garron, N. Chang, C.C. Rinaldi, E. Clark, M.A. Joó, B. Kurth, T. Tiburzi, B.C. Vranas, P. Walker-Loud, A. Department of Physics and Astronomy University of North Carolina Chapel HillNC27516-3255 United States Department of Physics University of California BerkeleyCA94720 United States Institut für Kernphysik Institute for Advanced Simulation Forschungszentrum Jülich Jülich54245 Germany Department of Physics College of William & Mary WilliamsburgVA23187 United States Nuclear Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Physics Division Lawrence Livermore National Laboratory LivermoreCA94550 United States Theoretical Physics Division Department of Mathematical Sciences University of Liverpool LiverpoolL69 3BX United Kingdom RIKEN 2-1 Hirosawa Wako Saitama351-0198 Japan RIKEN-BNL Research Center Brookhaven National Laboratory UptonNY11973 United States NVIDIA Corporation 2701 San Tomas Expressway Santa ClaraCA95050 United States Scientific Computing Group Thomas Jefferson National Accelerator Facility Newport NewsVA23606 United States NERSC Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Physics City College of New York New YorkNY10031 United States Graduate School and University Center City University of New York New YorkNY10016 United States

Observation of neutrinoless double beta decay, a lepton number violating process that has been proposed to clarify the nature of neutrino masses, has spawned an enormous world-wide experimental effort. Relating nuclear decay rates to high-energy, beyond the Standard Model (BSM) physics requires detailed knowledge of non-perturbative QCD effects. Using lattice QCD, we compute the necessary matrix elements of short-range operators, which arise due to heavy BSM mediators, that contribute to this decay via the leading order π-→ π+exchange diagrams. Utilizing our result and taking advantage of effective field theory methods will allow for model-independent calculations of the relevant two-nucleon decay, which may then be used as input for nuclear many-body calculations of the relevant experimental decays. Contributions from short-range operators may prove to be equally important to, or even more important than, those from long-range Majorana neutrino exchange. Copyright © 2018, The Authors. All rights reserved.

关键词： Quantum theory

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The mechanisms of self-organised criticality in social processes of knowledge creation

arXiv

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arXiv 2017年

作者： Tadić, Bosiljka Dankulov, Marija Mitrović Melnik, Roderick Department of Theoretical Physics Jozef Stefan Institute Jamova 39 Ljubljana Slovenia Scientific Computing Laboratory Center for the Study of Complex Systems Institute of Physics Belgrade University of Belgrade Pregrevica 118 Belgrade11080 Serbia MS2Discovery Interdisciplinary Research Institute M2NeT Laboratory Department of Mathematics Wilfrid Laurier University WaterlooON Canada

In the online social dynamics, a robust scaling behaviour appears as a key feature of many collaborative efforts that lead to the new social value. The underlying empirical data thus offer a unique opportunity to study the origin of self-organised criticality in social systems. In contrast to physical systems in the laboratory, various human attributes of the actors play an essential role in the process along with the contents (cognitive, emotional) of the communicated artefacts. As a prototypal example, we consider the social endeavour of knowledge creation via Questions & Answers (Q&A). Using a large empirical dataset from one of such Q&A sites and theoretical modelling, we examine the temporal correlations at all scales and the role of cognitive contents to the avalanches of the knowledge creation process. Our analysis shows that the long-range correlations and the event clustering are primarily determined by the universal social dynamics, providing the external driving of the system by the arrival of new users. While the involved cognitive contents (systematically annotated in the data and observed in the model) are crucial for a fine structure of the developing knowledge networks, they only affect the values of the scaling exponents and the geometry of large avalanches and shape the multifractal spectrum. Furthermore, we find that the level of the activity of the communities that share the knowledge correlates with the fluctuations of the innovation rate, implying that the increase of innovation may serve as the active principle of self-organisation. To identify relevant parameters and unravel the role of the network evolution underlying the process in the social system under consideration, we compare the social avalanches to the avalanche sequences occurring in the field-driven physical model of disordered solids, where the factors contributing to the collective dynamics are better understood. Copyright © 2017, The Authors. All rights reserved.

关键词： Large dataset

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Simulating the weak death of the neutron in a femtoscale universe with near-Exascale computing

arXiv

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arXiv 2018年

作者： Berkowitz, Evan Clark, M.A. Gambhir, Arjun McElvain, Ken Nicholson, Amy Rinaldi, Enrico Vranas, Pavlos Walker-Loud, André Chang, Chia Cheng Joó, Bálint Kurth, Thorsten Orginos, Kostas Institut für Kernphysik Institute for Advanced Simulation Forschungszentrum Jülich Jülich54245 Germany NVIDIA Corporation Santa ClaraCA95051 United States Physical Sciences Directorate Lawrence Livermore National Laboratory LivermoreCA94550 United States Nuclear Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Physics University of California BerkeleyCA94720 United States Department of Physics and Astronomy University of North Carolina Chapel HillNC27516-3255 United States RIKEN-BNL Research Center Brookhaven National Laboratory UptonNY11973 United States Scientific Computing Group Thomas Jefferson National Accelerator Facility Newport NewsVA23606 United States NERSC Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Physics College of William & Mary USA WilliamsburgVA 23187 United States Theory Center Thomas Jefferson National Accelerator Facility Newport NewsVA23606 United States

The fundamental particle theory called Quantum Chromodynamics (QCD) dictates everything about protons and neutrons, from their intrinsic properties to interactions that bind them into atomic nuclei. Quantities that cannot be fully resolved through experiment, such as the neutron lifetime (whose precise value is important for the existence of light-atomic elements that make the sun shine and life possible), may be understood through numerical solutions to QCD. We directly solve QCD using Lattice Gauge Theory and calculate nuclear observables such as neutron lifetime. We have developed an improved algorithm that exponentially decreases the time-to-solution and applied it on the new CORAL supercomputers, Sierra and Summit. We use run-time autotuning to distribute GPU resources, achieving 20% performance at low node count. We also developed optimal application mapping through a job manager, which allows CPU and GPU jobs to be interleaved, yielding 15% of peak performance when deployed across large fractions of CORAL. Copyright © 2018, The Authors. All rights reserved.

关键词： Quantum theory

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A percent-level determination of the nucleon axial coupling from Quantum Chromodynamics

arXiv

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arXiv 2018年

作者： Chang, C.C. Nicholson, A.N. Rinaldi, E. Berkowitz, E. Garron, N. Brantley, D.A. Monge-Camacho, H. Monahan, C. Bouchard, C. Clark, M.A. Joó, B. Kurth, T. Orginos, K. Vranas, P. Walker-Loud, A. Nuclear Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States RIKEN 2-1 Hirosawa Wako Saitama351-0198 Japan Department of Physics University of California BerkeleyCA94720 United States Department of Physics and Astronomy University of North Carolina Chapel HillNC27516-3255 United States RIKEN-BNL Research Center Brookhaven National Laboratory UptonNY11973 United States Physics Division Lawrence Livermore National Laboratory LivermoreCA94550 United States Institut für Kernphysik Institute for Advanced Simulation Forschungszentrum Jülich Jülich54245 Germany Theoretical Physics Division Department of Mathematical Sciences University of Liverpool LiverpoolL69 3BX United Kingdom Department of Physics College of William & Mary WilliamsburgVA 23187 United States Department of Physics and Astronomy Rutgers State University of New Jersey PiscatawayNJ08854 United States Institute for Nuclear Theory University of Washington SeattleWA98195 United States School of Physics and Astronomy University of Glasgow GlasgowG12 8QQ United Kingdom NVIDIA Corporation 2701 San Tomas Expressway Santa ClaraCA95050 United States Scientific Computing Group Thomas Jefferson National Accelerator Facility Newport NewsVA23606 United States NERSC Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Theory Center Thomas Jefferson National Accelerator Facility Newport NewsVA23606 United States

The axial coupling of the nucleon, gA, is the strength of its coupling to the weak axial current of the Standard Model of particle physics, in much the same way as the electric charge is the strength of the coupling to the electromagnetic current. This axial coupling dictates the rate at which neutrons decay to protons, the strength of the attractive long-range force between nucleons and other features of nuclear physics. Precision tests of the Standard Model in nuclear environments require a quantitative understanding of nuclear physics rooted in Quantum Chromodynamics, a pillar of the Standard Model. The prominence of gA makes it a benchmark quantity to determine theoretically – a difficult task because quantum chromodynamics is non-perturbative, precluding known analytical methods. Lattice Quantum Chromodynamics provides a rigorous, non-perturbative definition of quantum chromodynamics that can be implemented numerically. It has been estimated that a precision of two percent would be possible by 2020 if two challenges are overcome1,2: contamination of gA from excited states must be controlled in the calculations and statistical precision must be improved markedly2–10. Here we report a calculation of gAQCD = 1.271 ± 0.013, using an unconventional method inspired by the Feynman–Hellmann theorem11 that overcomes these challenges. Copyright © 2018, The Authors. All rights reserved.

关键词： Quantum theory

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DASHMM accelerated adaptive fast multipole poisson-boltzmann solver on distributed memory architecture

arXiv

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arXiv 2017年

作者： Zhang, B. DeBuhr, J. Niedzielski, D. Mayolo, S. Lu, B. Sterling, T. Center for Research in Extreme Scale Technologies School of Informatics Computing and Engineering Indiana University BloomingtonIN47404 United States Department of Physics Rensselaer Polytechnic Institute TroyNY12180 United States Department of Computer Science Tennessee Technological University CookevilleTN38505 United States State Key Laboratory of Scientific/Engineering Computing Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing100190

We present an updated version of the AFMPB package for fast calculation of molecular solvation-free energy. The main feature of the new version is the successful adoption of the DASHMM library, which enables AFMPB to operate on distributed memory computers. As a result, the new version can easily handle larger molecules or situations with higher accuracy requirements. To demonstrate the updated code, we applied the new version to a dengue virus system with more than one million atoms and a mesh with approximately 20 million triangles, and were able to reduce the time-to-solution from 10 hours reported in the previous release on a shared memory computer to less than 30 seconds on a Cray XC30 cluster using 12, 288 cores. Copyright © 2017, The Authors. All rights reserved.

关键词： Boundary element method

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Parkes Pulsar Timing Array constraints on ultralight scalar-field dark matter

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Physical Review D 2018年第10期98卷 102002-102002页

作者： Nataliya K. Porayko Xingjiang Zhu Yuri Levin Lam Hui George Hobbs Aleksandra Grudskaya Konstantin Postnov Matthew Bailes N. D. Ramesh Bhat William Coles Shi Dai James Dempsey Michael J. Keith Matthew Kerr Michael Kramer Paul D. Lasky Richard N. Manchester Stefan Osłowski Aditya Parthasarathy Vikram Ravi Daniel J. Reardon Pablo A. Rosado Christopher J. Russell Ryan M. Shannon Renée Spiewak Willem van Straten Lawrence Toomey Jingbo Wang Linqing Wen Xiaopeng You Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 D-53121 Bonn Germany School of Physics and Astronomy Monash University Clayton VIC 3800 Australia School of Physics University of Western Australia Crawley WA 6009 Australia OzGrav: Australian Research Council Centre of Excellence for Gravitational Wave Discovery Hawthorn VIC 3122 Australia Center for Theoretical Physics Department of Physics Columbia University New York New York 10027 USA Center for Computational Astrophysics Flatiron Institute New York New York 10010 USA CSIRO Astronomy and Space Science P.O. Box 76 Epping NSW 1710 Australia Sternberg Astronomical Institute Lomonosov Moscow State University Universitetskii pr. 13 Moscow 119234 Russia Kazan Federal University Kremlevskaya 18 Kazan 420008 Russia Centre for Astrophysics and Supercomputing Swinburne University of Technology P.O. Box 218 Hawthorn VIC 3122 Australia International Centre for Radio Astronomy Research Curtin University Bentley WA 6102 Australia Department of Electrical and Computer Engineering University of California at San Diego La Jolla California 92093 USA CSIRO Information Management and Technology PO Box 225 Dickson ACT 2602 Australia Jodrell Bank Center for Astrophysics University of Manchester Manchester M13 9PL UK Space Science Division Naval Research Laboratory Washington DC 20375 USA Cahill Center for Astronomy and Astrophysics MC 249-17 California Institute of Technology Pasadena California 91125 USA CSIRO Scientific Computing Australian Technology Park Locked Bag 9013 Alexandria NSW 1435 Australia Institute for Radio Astronomy & Space Research Auckland University of Technology Private Bag 92006 Auckland 1142 New Zealand Xinjiang Astronomical Observatory Chinese Academy of Sciences 150 Science 1-Street Urumqi Xinjiang 830011 China School of Physical Science and Technology Southwest University Chongqing 400715 China

It is widely accepted that dark matter contributes about a quarter of the critical mass-energy density in our Universe. The nature of dark matter is currently unknown, with the mass of possible constituents spanning nearly one hundred orders of magnitude. The ultralight scalar field dark matter, consisting of extremely light bosons with m∼10−22 eV and often called “fuzzy” dark matter, provides intriguing solutions to some challenges at sub-Galactic scales for the standard cold dark matter model. As shown by Khmelnitsky and Rubakov, such a scalar field in the Galaxy would produce an oscillating gravitational potential with nanohertz frequencies, resulting in periodic variations in the times of arrival of radio pulses from pulsars. The Parkes Pulsar Timing Array (PPTA) has been monitoring 20 millisecond pulsars at two- to three-week intervals for more than a decade. In addition to the detection of nanohertz gravitational waves, PPTA offers the opportunity for direct searches for fuzzy dark matter in an astrophysically feasible range of masses. We analyze the latest PPTA data set which includes timing observations for 26 pulsars made between 2004 and 2016. We perform a search in this data set for evidence of ultralight dark matter in the Galaxy using Bayesian and Frequentist methods. No statistically significant detection has been made. We, therefore, place upper limits on the local dark matter density. Our limits, improving on previous searches by a factor of 2 to 5, constrain the dark matter density of ultralight bosons with m≤10−23 eV to be below 6 GeV cm−3 with 95% confidence in the Earth neighborhood. Finally, we discuss the prospect of probing the astrophysically favored mass range m≳10−22 eV with next-generation pulsar timing facilities.

关键词： Dark matter Neutron stars & pulsars Electromagnetic radiation astronomy Gravitational wave detection

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Search for heavy resonances decaying to a Z boson and a photon in pp collisions at s=13 TeV with the ATLAS detector

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physics Letters, Section B: Nuclear, Elementary Particle and High-Energy physics 2017年 764卷 11-30页

作者： Aaboud, M. Aad, G. Abbott, B. Abdallah, J. Abdinov, O. Abeloos, B. Aben, R. AbouZeid, O.S. Abraham, N.L. Abramowicz, H. Abreu, H. Abreu, R. Abulaiti, Y. Acharya, B.S. Adachi, S. Adamczyk, L. Adams, D.L. Adelman, J. Adomeit, S. Adye, T. Affolder, A.A. Agatonovic-Jovin, T. Agricola, J. Aguilar-Saavedra, J.A. Ahlen, S.P. Ahmadov, F. Aielli, G. Akerstedt, H. Åkesson, T.P.A. Akimov, A.V. Alberghi, G.L. Albert, J. Albrand, S. Alconada Verzini, M.J. Aleksa, M. Aleksandrov, I.N. Alexa, C. Alexander, G. Alexopoulos, T. Alhroob, M. Ali, B. Aliev, M. Alimonti, G. Alison, J. Alkire, S.P. Allbrooke, B.M.M. Allen, B.W. Allport, P.P. Aloisio, A. Alonso, A. Alonso, F. Alpigiani, C. Alshehri, A.A. Alstaty, M. Alvarez Gonzalez, B. Álvarez Piqueras, D. Alviggi, M.G. Amadio, B.T. Amako, K. Amaral Coutinho, Y. Amelung, C. Amidei, D. Amor Dos Santos, S.P. Amorim, A. Amoroso, S. Amundsen, G. Anastopoulos, C. Ancu, L.S. Andari, N. Andeen, T. Anders, C.F. Anders, G. Anders, J.K. Anderson, K.J. Andreazza, A. Andrei, V. Angelidakis, S. Angelozzi, I. Anger, P. Angerami, A. Anghinolfi, F. Anisenkov, A.V. Anjos, N. Annovi, A. Antel, C. Antonelli, M. Antonov, A. Anulli, F. Aoki, M. Aperio Bella, L. Arabidze, G. Arai, Y. Araque, J.P. Arce, A.T.H. Arduh, F.A. Arguin, J-F. Argyropoulos, S. Arik, M. Armbruster, A.J. Armitage, L.J. Arnaez, O. Arnold, H. Arratia, M. Arslan, O. Artamonov, A. Artoni, G. Artz, S. Asai, S. Asbah, N. Ashkenazi, A. Åsman, B. Asquith, L. Assamagan, K. Astalos, R. Atkinson, M. Atlay, N.B. Augsten, K. Avolio, G. Axen, B. Ayoub, M.K. Azuelos, G. Baak, M.A. Baas, A.E. Baca, M.J. Bachacou, H. Bachas, K. Backes, M. Backhaus, M. Bagiacchi, P. Bagnaia, P. Bai, Y. Baines, J.T. Baker, O.K. Baldin, E.M. Balek, P. Balestri, T. Balli, F. Balunas, W.K. Banas, E. Banerjee, Sw. Bannoura, A.A.E. Barak, L. Barberio, E.L. Barberis, D. Barbero, M. Barillari, T. Barisits, M-S Barklow, T. Barlow, N. Barnes, S.L. Barnett, B.M. Barnett, R.M. Barnovska-Blenessy, Z. Baroncelli, A. Barone, G. Barr, A.J. Barranco Navarro, L. Barreiro, F. Barreiro Gui Department of Physics University of Adelaide Adelaide Australia Physics Department SUNY Albany Albany NY United States Department of Physics University of Alberta Edmonton AB Canada Department of Physics Ankara University Ankara Turkey Istanbul Aydin University Istanbul Turkey Division of Physics TOBB University of Economics and Technology Ankara Turkey LAPP CNRS/IN2P3 Université Savoie Mont Blanc Annecy-le-Vieux France High Energy Physics Division Argonne National Laboratory Argonne IL United States Department of Physics University of Arizona Tucson AZ United States Department of Physics The University of Texas at Arlington Arlington TX United States Physics Department University of Athens Athens Greece Physics Department National Technical University of Athens Zografou Greece Department of Physics The University of Texas at Austin Austin TX United States Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Institut de Física d'Altes Energies (IFAE) The Barcelona Institute of Science and Technology Barcelona Spain Institute of Physics University of Belgrade Belgrade Serbia Department for Physics and Technology University of Bergen Bergen Norway Physics Division Lawrence Berkeley National Laboratory University of California Berkeley CA United States Department of Physics Humboldt University Berlin Germany Albert Einstein Center for Fundamental Physics Laboratory for High Energy Physics University of Bern Bern Switzerland School of Physics and Astronomy University of Birmingham Birmingham United Kingdom Department of Physics Bogazici University Istanbul Turkey Department of Physics Engineering Gaziantep University Gaziantep Turkey Istanbul Bilgi University Faculty of Engineering and Natural Sciences Istanbul Turkey Bahcesehir University Faculty of Engineering and Natural Sciences Istanbul Turkey Centro de Investigaciones Universidad Antonio Narino Bogota Colombia INFN Sezione di Bologna Italy Dipartimento di Fis

This Letter presents a search for new resonances with mass larger than 250 GeV, decaying to a Z boson and a photon. The dataset consists of an integrated luminosity of 3.2 fb−1 of pp collisions collected at s=13 TeV w... 详细信息

This Letter presents a search for new resonances with mass larger than 250 GeV, decaying to a Z boson and a photon. The dataset consists of an integrated luminosity of 3.2 fb⁻¹ of pp collisions collected at s=13 TeV with the ATLAS detector at the Large Hadron Collider. The Z bosons are identified through their decays either to charged, light, lepton pairs (e⁺e⁻, μ⁺μ⁻) or to hadrons. The data are found to be consistent with the expected background in the whole mass range investigated and upper limits are set on the production cross section times decay branching ratio to Zγ of a narrow scalar boson with mass between 250 GeV and 2.75 TeV. © 2016 The Author(s)

关键词： Z bosons CROSS sections (Nuclear physics) PHOTON-photon interactions LARGE Hadron Collider (France & Switzerland) DILEPTON production NUCLEAR counters

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