检索结果-内蒙古大学图书馆

Measurement of fs/fu Variation with Proton-Proton Collision Energy and B-Meson Kinematics

Physical Review Letters 2020年第12期124卷 122002-122002页

作者： R. Aaij C. Abellán Beteta B. Adeva M. Adinolfi C. A. Aidala Z. Ajaltouni S. Akar P. Albicocco J. Albrecht F. Alessio M. Alexander A. Alfonso Albero G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato Y. Amhis L. An L. Anderlini G. Andreassi M. Andreotti J. E. Andrews F. Archilli J. Arnau Romeu A. Artamonov M. Artuso K. Arzymatov E. Aslanides M. Atzeni B. Audurier S. Bachmann J. J. Back S. Baker V. Balagura W. Baldini A. Baranov R. J. Barlow S. Barsuk W. Barter M. Bartolini F. Baryshnikov V. Batozskaya B. Batsukh A. Battig V. Battista A. Bay F. Bedeschi I. Bediaga A. Beiter L. J. Bel V. Belavin S. Belin N. Beliy V. Bellee K. Belous I. Belyaev G. Bencivenni E. Ben-Haim S. Benson S. Beranek A. Berezhnoy R. Bernet D. Berninghoff H. C. Bernstein E. Bertholet A. Bertolin C. Betancourt F. Betti M. O. Bettler Ia. Bezshyiko S. Bhasin J. Bhom M. S. Bieker S. Bifani P. Billoir A. Birnkraut A. Bizzeti M. Bjørn M. P. Blago T. Blake F. Blanc S. Blusk D. Bobulska V. Bocci O. Boente Garcia T. Boettcher A. Boldyrev A. Bondar N. Bondar S. Borghi M. Borisyak M. Borsato M. Boubdir T. J. V. Bowcock C. Bozzi S. Braun A. Brea Rodriguez M. Brodski J. Brodzicka A. Brossa Gonzalo D. Brundu E. Buchanan A. Buonaura C. Burr A. Bursche J. S. Butter J. Buytaert W. Byczynski S. Cadeddu H. Cai R. Calabrese S. Cali R. Calladine M. Calvi M. Calvo Gomez A. Camboni P. Campana D. H. Campora Perez L. Capriotti A. Carbone G. Carboni R. Cardinale A. Cardini P. Carniti K. Carvalho Akiba A. Casais Vidal G. Casse M. Cattaneo G. Cavallero R. Cenci M. G. Chapman M. Charles Ph. Charpentier G. Chatzikonstantinidis M. Chefdeville V. Chekalina C. Chen S. Chen S.-G. Chitic V. Chobanova M. Chrzaszcz A. Chubykin P. Ciambrone X. Cid Vidal G. Ciezarek F. Cindolo P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier J. L. Cobbledick V. Coco J. A. B. Coelho J. Cogan E. Cogneras L. Cojocariu P. Collins T. Colombo A. Comerma-Montells A. Contu N. Cooke G. Coombs S. Coquereau G. Corti C. M. Costa Sobral B. Couturier G. A. Cowan D. C. Craik A. Crocombe M. Cruz Torres R. Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Physik-Institut Universität Zürich Zürich Switzerland Instituto Galego de Física de Altas Enerxías (IGFAE) Universidade de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom University of Michigan Ann Arbor Michigan USA (associated with Syracuse University Syracuse New York USA) Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France University of Cincinnati Cincinnati Ohio USA INFN Laboratori Nazionali di Frascati Frascati Italy Fakultät Physik Technische Universität Dortmund Dortmund Germany European Organization for Nuclear Research (CERN) Geneva Switzerland School of Physics and Astronomy University of Glasgow Glasgow United Kingdom ICCUB Universitat de Barcelona Barcelona Spain Petersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI) Gatchina Russia Imperial College London London United Kingdom Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France INFN Sezione di Firenze Firenze Italy Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland INFN Sezione di Ferrara Ferrara Italy University of Maryland College Park Maryland USA Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France Institute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI) Protvino Russia Protvino Russia Syracuse University Syracuse New York USA Yandex School of Data Analysis Moscow Russia INFN Sezione di Cagliari Monserrato Italy Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Department of Physics University of Warwick Coventry United Kingdom Department of Physics and Astronomy University of Manchester Manchester United Kingdom INFN Sezione di Genova Genova Italy National Center for Nuclear Research (NCBJ) Warsaw Poland INFN Sezi

The ratio of the Bs0 and B+ fragmentation fractions fs and fu is studied with Bs0→J/ψϕ and B+→J/ψK+ decays using data collected by the LHCb experiment in proton-proton collisions at 7, 8, and 13 TeV center-of-mass energies. The analysis is performed in bins of B-meson momentum, longitudinal momentum, transverse momentum, pseudorapidity, and rapidity. The fragmentation-fraction ratio fs/fu is observed to depend on the B-meson transverse momentum with a significance of 6.0σ. This dependency is driven by the 13 TeV sample (8.7σ), while the results for the other collision energies are not significant when considered separately. Furthermore, the results show a 4.8σ evidence for an increase of fs/fu as a function of collision energy.

关键词： Branching fraction Fragmentation into hadrons Hadron-hadron interactions Particle decays Particle production Strong interaction

来源：评论

学校读者我要写书评

暂无评论

Chiral properties of graphene h-BN hybrid systems

arXiv

引用

arXiv 2018年

作者： Molenda, A. Zasada, I. Maślanka, P. Department of Solid State Physics Faculty of Physics and Applied Informatics University of Lódź Pomorska 149/153 Lódź90-236 Poland Department of Computer Science Faculty of Physics and Applied Informatics University of Lódź Pomorska 149/153 Lódź490-236 Poland

The application of the chiral decomposition procedure to hybrid graphene h-BN systems revealed rules for the partition of the system into effective sub- systems being bilayers plus monolayer in case the number of layers is odd. Three types of subsystems have been detected namely purely graphene bi- layers and monolayers, mixed bilayers and pure h-BN monolayers depending on the hybrid composition. The effective parameters characterizing these chi- ral subsystems consist of the interlayer couplings and on-site potentials which shows the mechanism of compensation of the asymmetry introduced into the system by h-BN layers. For illustration, we provide a pedagogical overview about chiral tunneling in graphene subsystems (MLG, BLG) present in hybrid with one h-BN layer. We have established the parameter ranges for which the characteristic features in the spectrum are observed, such as Fabry-Pérot resonances in the case of MLG and magic angles in the case of effective BLG. We also consider different hybrid stacking in order to indicate effective systems with the desired properties required in the electronic and spintronic applica- tions. Copyright © 2018, The Authors. All rights reserved.

关键词： Boron nitride

来源：评论

学校读者我要写书评

暂无评论

The crossing tverberg theorem

arXiv

引用

arXiv 2018年

作者： Fulek, Radoslav Gärtner, Bernd Kupavskii, Andrey Valtr, Pavel Wagner, Uli IST Austria Klosterneuburg Austria Department of Computer Science ETH Zürich Switzerland University of Oxford United Kingdom Moscow Institute of Physics and Technology Russia Department of Applied Mathematics Faculty of Mathematics and Physics Charles University Prague Czech Republic

The Tverberg theorem is one of the cornerstones of discrete geometry. It states that, given a set X of at least (d + 1)(r − 1) + 1 points in Rd, one can find a partition X = X1 ∪... ∪ Xr of X, such that the convex hulls of the Xi, i = 1,..., r, all share a common point. In this paper, we prove a strengthening of this theorem that guarantees a partition which, in addition to the above, has the property that the boundaries of full-dimensional convex hulls have pairwise nonempty intersections. Possible generalizations and algorithmic aspects are also discussed. As a concrete application, we show that any n points in the plane in general position span bn/3c vertex-disjoint triangles that are pairwise crossing, meaning that their boundaries have pairwise nonempty intersections;this number is clearly best possible. A previous result of Alvarez-Rebollar et al. guarantees bn/6c pairwise crossing triangles. Our result generalizes to a result about simplices in Rd, d ≥ *** Codes 05A18, 68R05 Copyright © 2018, The Authors. All rights reserved.

关键词： Computational geometry

来源：评论

学校读者我要写书评

暂无评论

C/2014 UN271(Bernardinelli-Bernstein): The nearly spherical cow of comets

arXiv

引用

arXiv 2021年

作者： Bernardinelli, Pedro H. Bernstein, Gary M. Montet, Benjamin T. Weryk, Robert Wainscoat, Richard Aguena, M. Allam, S. Andrade-Oliveira, F. Annis, J. Avila, S. Bertin, E. Brooks, D. Burke, D.L. Rosell, A. Carnero Kind, M. Carrasco Carretero, J. Cawthon, R. Conselice, C. Costanzi, M. Da Costa, L.N. Pereira, M.E.S. De Vicente, J. Diehl, H.T. Everett, S. Ferrero, I. Flaugher, B. Frieman, J. García-Bellido, J. Gaztanaga, E. Gerdes, D.W. Gruen, D. Gruendl, R.A. Gschwend, J. Gutierrez, G. Hinton, S.R. Hollowood, D.L. Honscheid, K. James, D.J. Kuehn, K. Kuropatkin, N. Lahav, O. Maia, M.A.G. Marshall, J.L. Menanteau, F. Miquel, R. Morgan, R. Ogando, R.L.C. Paz-Chinchón, F. Pieres, A. Plazas Malagón, A.A. Rodriguez-Monroy, M. Romer, A.K. Roodman, A. Sanchez, E. Schubnell, M. Serrano, S. Sevilla-Noarbe, I. Smith, M. Soares-Santos, M. Suchyta, E. Swanson, M.E.C. Tarle, G. To, C. Troxel, M.A. Varga, T.N. Walker, A.R. Zhang, Y. Department of Physics and Astronomy University of Pennsylvania PhiladelphiaPA19104 United States School of Physics University of New South Wales SydneyNSW2052 Australia UNSW Data Science Hub University of New South Wales SydneyNSW2052 Australia Dept. of Physics & Astronomy University of Western Ontario 1151 Richmond Street LondonONN6A 3K7 Canada Institute for Astronomy University of Hawaii 2680 Woodlawn Drive HonoluluHI96822 United States Laboratório Interinstitucional de e-Astronomia - LIneA Rua Gal. José Cristino 77 RJ Rio de Janeiro20921-400 Brazil Fermi National Accelerator Laboratory P. O. Box 500 BataviaIL60510 United States Instituto de Física Teórica Universidade Estadual Paulista São Paulo Brazil Instituto de Fisica Teorica CSIC Universidad Autonoma de Madrid Madrid28049 Spain CNRS UMR 7095 Institut d'Astrophysique de Paris ParisF-75014 France Sorbonne Universités UPMC Univ Paris 06 UMR 7095 Institut d'Astrophysique de Paris ParisF-75014 France Department of Physics & Astronomy University College London Gower Street LondonWC1E 6BT United Kingdom Kavli Institute for Particle Astrophysics & Cosmology Stanford University P. O. Box 2450 StanfordCA94305 United States SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Center for Astrophysical Surveys National Center for Supercomputing Applications 1205 West Clark St. UrbanaIL61801 United States Department of Astronomy University of Illinois at Urbana-Champaign 1002 W. Green Street UrbanaIL61801 United States The Barcelona Institute of Science and Technology Campus UAB Bellaterra Barcelona08193 Spain Physics Department University of Wisconsin-Madison 2320 Chamberlin Hall 1150 University Avenue MadisonWI53706-1390 United States Jodrell Bank Center for Astrophysics School of Physics and Astronomy University of Manchester Oxford Road ManchesterM13 9PL United Kingdom University of Nottingham School of Physics and Astronomy NottinghamNG7 2RD U

C/2014 UN271(Bernardinelli-Bernstein) is a comet incoming from the Oort cloud which is remarkable in having the brightest (and presumably largest) nucleus of any well-measured comet, and having been discovered at heliocentric distance rh≈29 au farther than any Oort-cloud member. We describe the properties that can be inferred from images recorded until the first reports of activity in June 2021. The orbit has i=95°, with perihelion of 10.97 au to be reached in 2031, and previous aphelion at 40,400±260 au. Backwards integration of the orbit under a standard Galactic tidal model and known stellar encounters suggests this is a pristine new comet, with a perihelion of q≈18 au on its previous perihelion passage 3.5 Myr ago. The photometric data show an unresolved nucleus with absolute magnitude Hr=8.0, colors that are typical of comet nuclei or Damocloids, and no secular trend as it traversed the range 34-23 au. For r-band geometric albedo pr, this implies a diameter of 150 (pr/0.04)-0.5km. There is strong evidence of brightness fluctuations at ±0.2 mag level, but no rotation period can be discerned. A coma consistent with a "stationary" 1/ρ surface-brightness distribution grew in scattering cross-section at an exponential rate from Afρ ≈ 1 m to ≈ 150 m as the comet approached from 28 to 20 au. The activity is consistent with a simple model of sublimation of a surface species in radiative equilibrium with the Sun. The inferred enthalpy of sublimation matches those of CO2and NH3. More-volatile species - N2, CH4, and CO - must be far less abundant on the sublimating surfaces. © 2021, CC BY-NC-ND.

关键词： Comets

来源：评论

学校读者我要写书评

暂无评论

Finding quadruply imaged quasars with machine learning. I. Methods

arXiv

引用

arXiv 2021年

作者： Akhazhanov, A. More, A. Amini, A. Hazlett, C. Treu, Tommaso Birrer, S. Shajib, A. Schechter, P. Lemon, C. Nord, B. Aguena, M. Allam, S. Andrade-Oliveira, F. Annis, J. Brooks, D. Buckley-Geer, E. Burke, D.L. Rosell, A. Carnero Kind, M. Carrasco Carretero, J. Choi, A. Conselice, C. Costanzi, M. Da Costa, L.N. Pereira, M.E.S. De Vicente, J. Desai, S. Dietrich, J.P. Doel, P. Everett, S. Ferrero, I. Finley, D.A. Flaugher, B. Frieman, J. García-Bellido, J. Gerdes, D.W. Gruen, D. Gruendl, R.A. Gschwend, J. Gutierrez, G. Hinton, S.R. Hollowood, D.L. Honscheid, K. James, D.J. Kim, A.G. Kuehn, K. Kuropatkin, N. Lahav, O. Lima, M. Lin, H. Maia, M.A.G. March, M. Menanteau, F. Miquel, R. Morgan, R. Palmese, A. Paz-Chinchón, F. Pieres, A. Malagón, A. A. Plazas Sanchez, E. Scarpine, V. Serrano, S. Sevilla-Noarbe, I. Smith, M. Soares-Santos, M. Suchyta, E. Swanson, M.E.C. Tarle, G. To, C. Varga, T.N. Weller, J. Department of Electrical and Computer Engineering University of California Los AngelesCA90095 United States Department of Electrical and Computer Engineering Nazarbayev University Nur-Sultan Kazakhstan Post Bag 4 Ganeshkhind Pune411007 India UTIAS The University of Tokyo Kashiwa Chiba277-8583 Japan Department of Statistics University of California Los AngelesCA90095 United States Department of Political Science University of California Los AngelesCA90095 United States Department of Physics and Astronomy PAB 430 Portola Plaza Box 951547 Los AngelesCA90095-1547 United States Graduate School of Education Stanford University 160 450 Serra Mall StanfordCA94305 United States Department of Astronomy & Astrophysics University of Chicago ChicagoIL60637 United States MIT Kavli Institute for Astrophysics and Space Research 37-664G 77 Massachusetts Avenue CambridgeMA02139 United States Observatoire de Sauverny VersoixCH-1290 Switzerland Fermi National Accelerator Laboratory P. O. Box 500 BataviaIL60510 United States Kavli Institute for Cosmological Physics University of Chicago ChicagoIL60637 United States Laboratório Interinstitucional de e-Astronomia - LIneA Rua Gal. José Cristino 77 RJ Rio de Janeiro20921-400 Brazil Instituto de Física Teórica Universidade Estadual Paulista São Paulo Brazil Department of Physics & Astronomy University College London Gower Street LondonWC1E 6BT United Kingdom Kavli Institute for Particle Astrophysics & Cosmology Stanford University P. O. Box 2450 StanfordCA94305 United States SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Center for Astrophysical Surveys National Center for Supercomputing Applications 1205 West Clark St. UrbanaIL61801 United States Department of Astronomy University of Illinois at Urbana-Champaign 1002 W. Green Street UrbanaIL61801 United States The Barcelona Institute of Science and Technology Campus UAB Barcelona08193 Spain Center for Cos

Strongly lensed quadruply imaged quasars (quads) are extraordinary objects. They are very rare in the sky - only a few tens are known to date - and yet they provide unique information about a wide range of topics, including the expansion history and the composition of the Universe, the distribution of stars and dark matter in galaxies, the host galaxies of quasars, and the stellar initial mass function. Finding them in astronomical images is a classic "needle in a haystack" problem, as they are outnumbered by other (contaminant) sources by many orders of magnitude. To solve this problem, we develop state-of-the-art deep learning methods and train them on realistic simulated quads based on real images of galaxies taken from the Dark Energy Survey, with realistic source and deflector models, including the chromatic effects of microlensing. The performance of the best methods on a mixture of simulated and real objects is excellent, yielding area under the receiver operating curve in the range 0.86 to 0.89. Recall is close to 100% down to total magnitude i ∼ 21 indicating high completeness, while precision declines from 85% to 70% in the range i ∼ 17 - 21. The methods are extremely fast: training on 2 million samples takes 20 hours on a GPU machine, and 108 multi-band cutouts can be evaluated per GPU-hour. The speed and performance of the method pave the way to apply it to large samples of astronomical sources, bypassing the need for photometric pre-selection that is likely to be a major cause of incompleteness in current samples of known quads. © 2021, CC BY.

关键词： Galaxies

来源：评论

学校读者我要写书评

暂无评论

Search for the rare decays Bs0 → e+e− and B0 → e+e−

arXiv

引用

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. Albicocco, P. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Alkhazov, G. Alvarez Cartelle, P. Alves, A.A. Amato, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreotti, M. Archilli, F. Artamonov, A. Artuso, M. Arzymatov, K. Aslanides, E. Atzeni, M. Audurier, B. Bachmann, S. Back, J.J. Baker, S. Balagura, V. Baldini, W. Baranov, A. 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. Belous, K. Belyaev, I. Bencivenni, G. Ben-Haim, E. Benson, S. 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. Bieker, M.S. Bifani, S. Billoir, P. Bizzeti, A. Bjørn, M. Blago, M.P. Blake, T. Blanc, F. Blusk, S. Bobulska, D. Bocci, V. Boente Garcia, O. Boettcher, T. Boldyrev, A. Bondar, A. Bondar, N. Borghi, S. Borisyak, M. Borsato, M. Borsuk, J.T. Bowcock, T.J.V. Bozzi, C. Bradley, M.J. Braun, S. Brea Rodriguez, A. Brodski, M. Brodzicka, J. Brossa Gonzalo, A. Brundu, D. Buchanan, E. Büchler-Germann, A. 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. 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. Chapman, M.G. Charles, M. Charpentier, Ph. Chatzikonstantinidis, G. Chefdeville, M. Chekalina, V. Chen, C. Chen, S. Chernov, A. Chitic, S.-G. Chobanova, V. Cholak, S. Chrzaszcz, M. Chubykin, 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 Wuhan Hubei 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 INFN Sezione di 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 Physics and Nuclear E

A search for the decays Bs0 → e+e− and B0 → e+e− is performed using data collected with the LHCb experiment in proton-proton collisions at center-of-mass energies of 7, 8 and 13 TeV, corresponding to integrated luminosities of 1, 2 and 2 fb−1, respectively. No signal is observed. Assuming no contribution from B0 → e+e− decays, an upper limit on the branching fraction B(Bs0 → e+e−) −9 is obtained at 90 (95) % confidence level. If no Bs0 → e+e− contribution is assumed, a limit of B(B0 → e+e−) −9 is determined at 90 (95) % confidence level. These upper limits are more than one order of magnitude lower than the previous values. Copyright © 2020, The Authors. All rights reserved.

关键词： High energy physics

来源：评论

学校读者我要写书评

暂无评论

Search for the lepton flavour violating decay B+→ K+µ−τ+ using Bs∗20 decays

arXiv

引用

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. Albicocco, P. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Alkhazov, G. Alvarez Cartelle, P. Alves, A.A. Amato, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreotti, M. Archilli, F. Artamonov, A. Artuso, M. Arzymatov, K. Aslanides, E. Atzeni, M. Audurier, B. Bachmann, S. Back, J.J. Baker, S. Balagura, V. Baldini, W. Baranov, A. 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. Bel, L.J. Belavin, V. Belin, S. Bellee, V. Belous, K. Belyaev, I. Bencivenni, G. Ben-Haim, E. Benson, S. Beranek, S. 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. Bieker, M.S. Bifani, S. Billoir, P. Bizzeti, A. Bjørn, M. Blago, M.P. Blake, T. Blanc, F. Blusk, S. Bobulska, D. Bocci, V. Boente Garcia, O. Boettcher, T. Boldyrev, A. Bondar, A. Bondar, N. Borghi, S. Borisyak, M. Borsato, M. Borsuk, J.T. Bowcock, T.J.V. Bozzi, C. Bradley, M.J. Braun, S. Brea Rodriguez, A. Brodski, M. Brodzicka, J. Brossa Gonzalo, A. Brundu, D. Buchanan, E. Büchler-Germann, A. 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. 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. Chapman, M.G. Charles, M. Charpentier, Ph. Chatzikonstantinidis, G. Chefdeville, M. Chekalina, V. Chen, C. Chen, S. Chernov, A. Chitic, S.-G. Chobanova, V. Cholak, S. 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 Wuhan Hubei 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 Universit Paris-Saclay CNRS IN2P3 IJCLab Orsay91405 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 INFN Sezione di 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 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 Physics and Nuclear

A search is presented for the lepton flavour violating decay (Equation Presented) using a sample of proton-proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, collected with the LHCb detector and corresponding to a total integrated luminosity of 9 fb−1. The τ leptons are selected inclusively, primarily via decays with a single charged particle. The four-momentum of the τ lepton is determined by using B+ mesons from (Equation Presented) decays. No significant excess is observed, and an upper limit is set on the branching fraction (Equation Presented) at 90% confidence level. The obtained limit is comparable to the world-best limit. Copyright © 2020, The Authors. All rights reserved.

关键词： Charged particles

来源：评论

学校读者我要写书评

暂无评论

Electronic structure of commensurate, nearly commensurate, and incommensurate phases of 1T−TaS2 by angle-resolved photoelectron spectroscopy, scanning tunneling spectroscopy, and density functional theory

引用

Physical Review B 2018年第19期98卷 195425-195425页

作者： I. Lutsyk M. Rogala P. Dabrowski P. Krukowski P. J. Kowalczyk A. Busiakiewicz D. A. Kowalczyk E. Lacinska J. Binder N. Olszowska M. Kopciuszynski K. Szalowski M. Gmitra R. Stepniewski M. Jalochowski J. J. Kolodziej A. Wysmolek Z. Klusek Department of Solid State Physics Faculty of Physics and Applied Informatics University of Lodz Pomorska 149/153 90-236 Lodz Poland Institute of Experimental Physics Faculty of Physics University of Warsaw Pasteura 5 02-093 Warsaw Poland Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Lojasiewicza 11 30-348 Krakow Poland Institute of Physics Maria Curie-Sklodowska University Plac Marii Curie-Sklodowskiej 1 20-031 Lublin Poland Department of Theoretical Physics and Astrophysics Institute of Physics Faculty of Science P. J. Šafárik University Park Angelinum 9 040 01 Košice Slovakia

The electronic structure of 1T−TaS2 showing a metal-insulator transition and a sequence of different charge density wave (CDW) transformations was discussed in the frame of variable temperature angle-resolved photoelectron spectroscopy (ARPES), scanning tunneling spectroscopy (STS), and density functional theory (DFT) calculations. For the commensurate charge density wave phase (CCDW) the Mott gap was estimated to be 0.4 eV and energy gaps ΔCCDW,1,ΔCCDW,2,ΔB3−HHB,ΔB4−B3 were observed. For the nearly commensurate charge density wave phase (NCCDW), the reminiscent of higher and lower Hubbard bands and a very pronounced electronic state associated with the parabolic band at the Γ¯ point in the Brillouin zone were identified. The incommensurate charge density wave phase (ICCDW) showed a high value of local density of states at the Fermi level and a very pronounced edge of the metallic surface state located in the range of 0.15–0.20 eV above the Fermi level. The obtained STS and ARPES results were consistent with our theoretical calculations performed within DFT formalism including spin-orbit coupling.

关键词： Band gap Charge density waves Density of states Fermi surface First-principles calculations Local density of states Spin-orbit coupling Dichalcogenides Transition metal dichalcogenides Angle-resolved photoemission spectroscopy Density functional theory Density functional theory development Low-energy electron diffraction Scanning tunneling microscopy Scanning tunneling spectroscopy

来源：评论

学校读者我要写书评

暂无评论

KM3NeT Core Collapse Supernovae observation program in standalone and multi-messenger modes 37

KM3NeT Core Collapse Supernovae observation program in stand...

引用

37th International Cosmic Ray Conference, ICRC 2021

作者： Coleiro, Alexis Dornic, Damien Kulikovskiy, Vladimir Lincetto, Massimiliano Molla, Marta Colomer Vannoye, Godefroy Ageron, M. Aiello, S. Albert, A. Alshamsi, M. Alves Garre, S. Aly, Z. Ambrosone, A. Ameli, F. Andre, M. Androulakis, G. Anghinolfi, M. Anguita, M. Anton, G. Ardid, M. Ardid, S. Assal, W. Aublin, J. Bagatelas, C. Baret, B. du Pree, S. Basegmez Bendahman, M. Benfenati, F. Berbee, E. van den Berg, A.M. Bertin, V. Beurthey, S. van Beveren, V. Biagi, S. Billault, M. Bissinger, M. Boettcher, M. Bou Cabo, M. Boumaaza, J. Bouta, M. Boutonnet, C. Bouvet, G. Bouwhuis, M. Bozza, C. Brânzaş, H. Bruijn, R. Brunner, J. Bruno, R. Buis, E. Buompane, R. Busto, J. Caiffi, B. Caillat, L. Calvo, D. Campion, S. Capone, A. Carduner, H. Carretero, V. Castaldi, P. Celli, S. Cereseto, R. Chabab, M. Champion, C. Chau, N. Chen, A. Cherubini, S. Chiarella, V. Chiarusi, T. Circella, M. Cocimano, R. Coelho, J.A.B. Coleiro, A. Colomer Molla, M. Colonges, S. Coniglione, R. Cosquer, A. Coyle, P. Cresta, M. Creusot, A. Cruz, A. Cuttone, G. D’Amico, A. Dallier, R. De Martino, B. De Palma, M. Di Palma, I. Díaz, A.F. Diego-Tortosa, D. Distefano, C. Domi, A. Donzaud, C. Dornic, D. Dörr, M. Drouhin, D. Eberl, T. Eddyamoui, A. van Eeden, T. van Eijk, D. El Bojaddaini, I. Eljarrari, H. Elsaesser, D. Enzenhöfer, A. Espinosa, V. Fermani, P. Ferrara, G. Filipović, M.D. Filippini, F. Fransen, J. Fusco, L.A. Gajanana, D. Gal, T. García Méndez, J. Garcia Soto, A. Garçon, E. Garufi, F. Gatius, C. Geißelbrecht, N. Gialanella, L. Giorgio, E. Gozzini, S.R. Gracia, R. Graf, K. Grella, G. Guderian, D. Guidi, C. Guillon, B. Gutiérrez, M. Haefner, J. Hallmann, S. Hamdaoui, H. van Haren, H. Heijboer, A. Hekalo, A. Hennig, L. Henry, S. Hernández-Rey, J.J. Hofestädt, J. Huang, F. Idrissi Ibnsalih, W. Ilioni, A. Illuminati, G. James, C.W. Janezashvili, D. Jansweijer, P. de Jong, M. de Jong, P. Jung, B.J. Kadler, M. Kalaczyński, P. Kalekin, O. Katz, U.F. Kayzel, F. Université de Paris CNRS Astroparticule et Cosmologie ParisF-75013 France Aix Marseille University CNRS IN2P3 CPPM Marseille France IINFN Sezione di Genova Via Dodecaneso 33 Genova16146 Italy Instituto de Física Corpuscular CSIC-Universitat de València c/Catedrático José Beltrán 2 Paterna ValenciaE-46980 Spain Ecole Normale Supérieure de Lyon 15 parvis René Descartes BP 7000 69342 LyonCedex 07 France Aix Marseille Univ CNRS IN2P3 CPPM Marseille France INFN Sezione di Catania Via Santa Sofia 64 Catania95123 Italy Université de Strasbourg CNRS IPHC UMR 7178 StrasbourgF-67000 France INFN CNAF v.le C. Berti-Pichat 6/2 Bologna40127 Italy IFIC - Instituto de Física Corpuscular CSIC - Universitat de València c/Catedrático José Beltrán 2 Paterna Valencia46980 Spain INFN Sezione di Napoli Complesso Universitario di Monte S. Angelo Via Cintia ed. G Napoli80126 Italy Università di Napoli "Federico II" Dip. Scienze Fisiche "E. Pancini" Complesso Universitario di Monte S. Angelo Via Cintia ed. G Napoli80126 Italy INFN Sezione di Roma Piazzale Aldo Moro 2 Roma00185 Italy Universitat Politècnica de Catalunya Laboratori d’Aplicacions Bioacústiques Centre Tecnològic de Vilanova i la Geltrú Avda. Rambla Exposició s/n Vilanova i la Geltrú08800 Spain NCSR Demokritos Institute of Nuclear and Particle Physics Ag. Paraskevi Attikis Athens15310 Greece INFN Sezione di Genova Via Dodecaneso 33 Genova16146 Italy University of Granada Dept. of Computer Architecture and Technology CITIC Granada18071 Spain Friedrich-Alexander-Universität Erlangen-Nürnberg Erlangen Centre for Astroparticle Physics Erwin-Rommel-Straße 1 Erlangen91058 Germany Universitat Politècnica de València Instituto de Investigación para la Gestión Integrada de las Zonas Costeras C/Paranimf 1 Gandia46730 Spain Nikhef National Institute for Subatomic Physics PO Box 41882 Amsterdam1009 DB Netherlands University Mohammed V in Rabat Faculty of Sciences 4 av. Ibn Battout

The KM3NeT research infrastructure in the Mediterranean is a multi-purpose cubic-kilometre neutrino observatory consisting of two detectors optimised to study cosmic and atmospheric neutrinos between GeV to PeV energies. Additionally, KM3NeT multi-photomultiplier optical modules allow the detection of interaction products from neutrinos with energies of a few MeV by selecting nanosecond coincidences within the photomultipliers of the same module. The distribution of the number of photomultipliers forming a coincidence (multiplicity) for the duration of the supernova emission is used as a proxy of the average neutrino energy. Using an optimised coincidence selection the KM3NeT detectors will be sensitive to supernovae in our Galaxy and beyond. A high number of detected events from a core collapse supernova explosion is expected in KM3NeT thanks to its large effective volume. The measurement of the neutrino light curve properties, such as the light curve start time and the presence of the standing accretion shock instability oscillations is possible with such statistics. Sub-millisecond time synchronisation between KM3NeT detectors allows joint observation. Such a scheme can be also a viable solution to synchronise the KM3NeT telescopes with other detectors aiming to observe neutrino emission from core collapse supernovae through the SNEWS network. © Copyright owned by the author(s).

关键词： Photomultipliers

来源：评论

学校读者我要写书评

暂无评论

Multiplexed Metasurfaces: Wavevector and Frequency Multiplexing Performed by a Spin-Decoupled Multichannel Metasurface (Adv. Mater. Technol. 1/2020)

引用

Advanced Materials Technologies 2020年第1期5卷

作者： He-Xiu Xu Guangwei Hu Menghua Jiang Shiwei Tang Yanzhao Wang Chaohui Wang Yongjun Huang Xiaohui Ling Haiwen Liu Jiafeng Zhou Department of Electronic Science and Technology Air force Engineering University Xi'an 710051 China Department of Electrical and Computer Engineering National University of Singapore Singapore 117583 Singapore Department of Physics Faculty of Science Ningbo University Ningbo 315211 China School of Information and Communication Engineering University of Electronic Science and Technology Chengdu 611731 China College of Physics and Electronic Engineering Hengyang Normal University Hengyang 421002 China School of Electronic and Information Engineering Xi'an Jiaotong University Xi'an 710049 China Department of Electrical Engineering and Electronics University of Liverpool Liverpool L69 3GJ UK

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：