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search for long-lived, massive particles in events with a displaced vertex and a muon with large impact parameter in pp collisions at s=13 TeV with the ATLAs detector

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Physical Review D 2020年第3期102卷 032006-032006页

作者： G. Aad b. Abbott D. C. Abbott A. Abed Abud K. Abeling D. K. Abhayasinghe s. H. Abidi O. s. AbouZeid N. L. Abraham H. Abramowicz H. Ab.e. Y. Abulaiti b. s. Acharya b. Achkar s. Adachi L. Adam C. Adam bourdarios L. Adamczyk L. Adamek J. Adelman M. Adersberger A. Adiguzel s. Adorni T. Adye A. A. Affolder Y. Afik C. Agapopoulou M. N. Agaras A. Aggarwal C. Agheorghiesei J. A. Aguilar-saavedra F. Ahmadov W. s. Ahmed X. Ai G. Aielli s. Akatsuka T. P. A. Åkesson e. Akilli A. V. Akimov K. Al Khoury G. L. Alberghi J. Albert M. J. Alconada Verzini s. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa D. Alexandre T. Alexopoulos A. Alfonsi F. Alfonsi M. Alhroob b. Ali G. Alimonti J. Alison s. P. Alkire C. Allaire b. M. M. Allbrooke b. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. A. Alshehri M. Alvarez estevez D. Álvarez Piqueras M. G. Alviggi Y. Amaral Coutinho A. Amb.e. L. Ambroz C. Amelung D. Amidei s. P. Amor Dos santos s. Amoroso C. s. Amrouche F. An C. Anastopoulos N. Andari T. Andeen C. F. Anders J. K. Anders A. Andreazza V. Andrei C. R. Anelli s. Angelidakis A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony M. Antonelli D. J. A. Antrim F. Anulli M. Aoki J. A. Aparisi Pozo L. Aperio bella G. Arabidze J. P. Araque V. Araujo Ferraz R. Araujo Pereira C. Arcangeletti A. T. H. Arce F. A. Arduh J-F. Arguin s. Argyropoulos J.-H. Arling A. J. Armbruster A. Armstrong O. Arnaez H. Arnold Z. P. Arrubarrena Tame A. Artamonov G. Artoni s. Artz s. Asai N. Asbah e. M. Asimakopoulou L. Asquith J. Assahsah K. Assamagan R. Astalos R. J. Atkin M. Atkinson N. b. Atlay H. Atmani K. Augsten G. Avolio R. Avramidou M. K. Ayoub A. M. Azoulay G. Azuelos H. bachacou K. bachas M. backes F. backman P. bagnaia M. bahmani H. bahrasemani A. J. bailey V. R. bailey J. T. baines M. bajic C. bakalis O. K. baker P. J. bakker D. bakshi Gupta s. balaji e. M. baldin P. balek F. balli W. K. balunas J. balz e. banas A. bandyopadhyay sw. banerjee A. A. e. bannoura L. barak W. M. barbe e. L. barberio D. barberis M. barbero G. CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman OK United States of America Department of Physics University of Massachusetts Amherst MA United States of America INFN Sezione di Pavia Italy Dipartimento di Fisica Università di Pavia Pavia Italy II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen Germany Department of Physics Royal Holloway University of London Egham United Kingdom Department of Physics University of Toronto Toronto ON Canada Niels Bohr Institute University of Copenhagen Copenhagen Denmark Department of Physics and Astronomy University of Sussex Brighton United Kingdom Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel High Energy Physics Division Argonne National Laboratory Argonne IL United States of America INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics University of Tokyo Tokyo Japan Institut für Physik Universität Mainz Mainz Germany LAPP Université Grenoble Alpes Université Savoie Mont Blanc CNRS/IN2P3 Annecy France AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb IL United States of America Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Department of Physics Bogazici University Istanbul Turkey Département de Physique Nucléaire et Corpusculaire Université de Genève Genève Switzerland Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz CA United States of America IJCLab Université Paris-Saclay CNRS/IN2P3 91405 Orsay Franc

A search for long-lived particles decaying into hadrons and at least one muon is presented. The analysis selects events that pass a muon or missing-transverse-momentum trigger and contain a displaced muon track and a displaced vertex. The analyzed dataset of proton-proton collisions at s=13 TeV was collected with the ATLAs detector and corresponds to 136 fb−1. The search employs dedicated reconstruction techniques that significantly increase the sensitivity to long-lived particle decays that occur in the ATLAs inner detector. background estimates for standard Model processes and instrumental effects are extracted from data. The ob.e.ved event yields are compatib.e.with those expected from background processes. The results are presented as limits at 95% confidence level on model-independent cross sections for processes beyond the standard Model, and interpreted as exclusion limits in scenarios with pair production of long-lived top squarks that decay via a small R-parity-violating coupling into a quark and a muon. Top squarks with masses up to 1.7 TeV are excluded for a lifetime of 0.1 ns, and masses below 1.3 TeV are excluded for lifetimes between 0.01 ns and 30 ns.

关键词： supersymmetric models

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Dark energy survey year 1 results: Cosmological constraints from cluster abundances and weak lensing

arXiv

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arXiv 2020年

作者： Abbott, T.M.C. Aguena, M. Alarcon, A. Allam, s. Allen, s. Annis, J. Avila, s. bacon, D. bechtol, K. bermeo, A. bernstein, G.M. bertin, e. bhargava, s. bocquet, s. brooks, D. brout, D. buckley-Geer, e. burke, D.L. Carnero Rosell, A. Carrasco Kind, M. Carretero, J. Castander, F.J. Cawthon, R. Chang, C. Chen, X. Choi, A. Costanzi, M. Crocce, M. da Costa, L.N. Davis, T.M. de Vicente, J. DeRose, J. Desai, s. Diehl, H.T. Dietrich, J.P. Dodelson, s. Doel, P. Drlica-Wagner, A. eckert, K. eifler, T.F. elvin-Poole, J. estrada, J. everett, s. evrard, A.e. Farahi, A. Ferrero, I. Flaugher, b. Fosalba, P. Frieman, J. García-bellido, J. Gatti, M. Gaztanaga, e. Gerdes, D.W. Giannantonio, T. Giles, P. Grandis, s. Gruen, D. Gruendl, R.A. Gschwend, J. Gutierrez, G. Hartley, W.G. Hinton, s.R. Hollowood, D.L. Honscheid, K. Hoyle, b. Huterer, D. James, D.J. Jarvis, M. Jeltema, T. Johnson, M.W.G. Johnson, M.D. Kent, s. Krause, e. Kron, R. Kuehn, K. Kuropatkin, N. Lahav, O. Li, T.s. Lidman, C. Lima, M. Lin, H. MacCrann, N. Maia, M.A.G. Mantz, A. Marshall, J.L. Martini, P. Mayers, J. Melchior, P. Mena-Fernández, J. Menanteau, F. Miquel, R. Mohr, J.J. Nichol, R.C. Nord, b. Ogando, R.L.C. Palmese, A. Paz-Chinchón, F. Plazas, A.A. Prat, J. Rau, M.M. Romer, A.K. Roodman, A. Rooney, P. Rozo, e. Rykoff, e.s. sako, M. samuroff, s. sánchez, C. sanchez, e. saro, A. scarpine, V. schub.e.l, M. scolnic, D. serrano, s. sevilla-Noarbe, I. sheldon, e. Allyn. smith, J. smith, M. suchyta, e. swanson, M.e.C. Tarle, G. Thomas, D. To, C. Troxel, M.A. Tucker, D.L. Varga, T.N. von der Linden, A. Walker, A.R. Wechsler, R.H. Weller, J. Wilkinson, R.D. Wu, H. Yanny, b. Zhang, Y. Zhang, Z. Zuntz, J. Collaboration, D.e.s. Cerro Tololo Inter-American Observatory National Optical Astronomy Observatory Casilla 603 La Serena Chile Departamento de Física Matemática Instituto de Física Universidade de São Paulo CP 66318 São Paulo SP05314-970 Brazil Laboratório Interinstitucional de e-Astronomia - LIneA Rua Gal. José Cristino 77 Rio de Janeiro RJ20921-400 Brazil Barcelona08034 Spain Campus UAB Carrer de Can Magrans s/n Barcelona08193 Spain Fermi National Accelerator Laboratory P. O. Box 500 BataviaIL60510 United States Department of Physics Stanford University 382 Via Pueblo Mall StanfordCA94305 United States Instituto de Fisica Teorica UAM/CSIC Universidad Autonoma de Madrid Madrid28049 Spain Institute of Cosmology and Gravitation University of Portsmouth PortsmouthPO1 3FX United Kingdom LSST 933 North Cherry Avenue TucsonAZ85721 United States Physics Department 2320 Chamberlin Hall University of Wisconsin-Madison 1150 University Avenue MadisonWI53706-1390 United States Department of Physics and Astronomy Pevensey Building University of Sussex BrightonBN1 9QH United Kingdom Department of Physics and Astronomy University of Pennsylvania PhiladelphiaPA19104 United States 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 Argonne National Laboratory 9700 South Cass Avenue LemontIL60439 United States Faculty of Physics Ludwig-Maximilians-Universität Scheinerstr. 1 Munich81679 Germany 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 Madrid Spain Department of Astronomy University of Illinois at Urbana-Champaign 1002 W. Green Street UrbanaIL61801 United States National Center

We perform a joint analysis of the counts and weak lensing signal of redMaPPer clusters selected from the Dark energy survey (Des) Year 1 dataset. Our analysis uses the same shear and source photometric redshifts estimates as were used in the Des combined probes analysis. Our analysis results in surprisingly low values for s8 = σ8(Ωm/0.3)0.5 = 0.65 ± 0.04, driven by a low matter density parameter, Ωm = 0.179+0−0..031038, with σ8 − Ωm posteriors in 2.4σ tension with the Des Y1 3x2pt results, and in 5.6σ with the Planck CMb analysis. These results include the impact of post-unblinding changes to the analysis, which did not improve the level of consistency with other data sets compared to the results obtained at the unblinding. The fact that multiple cosmological probes (supernovae, baryon acoustic oscillations, cosmic shear, galaxy clustering and CMb anisotropies), and other galaxy cluster analyses all favor significantly higher matter densities suggests the presence of systematic errors in the data or an incomplete modeling of the relevant physics. Cross checks with X-ray and microwave data, as well as independent constraints on the ob.e.vab.e.mass relation from sZ selected clusters, suggest that the discrepancy resides in our modeling of the weak lensing signal rather than the cluster abundance. Repeating our analysis using a higher richness threshold (λ ≥ 30) significantly reduces the tension with other probes, and points to one or more richness-dependent effects not captured by our model. Copyright © 2020, The Authors. All rights reserved.

关键词： systematic errors

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Ob.e.vations of solar system ob.e.ts

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Astronomy and Astrophysics 2018年 616卷

作者： spoto, F. Tanga, P. Mignard, F. berthier, J. Carry, b. Cellino, A. Dell'Oro, A. Hestroffer, D. Muinonen, K. Pauwels, T. Petit, J.-M. David, P. De Angeli, F. Delbo, M. Frézouls, b. Galluccio, L. Granvik, M. Guiraud, J. Hernández, J. Ordénovic, C. Portell, J. Poujoulet, e. Thuillot, W. Walmsley, G. brown, A.G.A. Vallenari, A. Prusti, T. De bruijne, J.H.J. babusiaux, C. bailer-Jones, C.A.L. b.e.mann, M. evans, D.W. eyer, L. Jansen, F. Jordi, C. Klioner, s.A. Lammers, U. Lindegren, L. Luri, X. Panem, C. Pourbaix, D. Randich, s. sartoretti, P. siddiqui, H.I. soubiran, C. Van Leeuwen, F. Walton, N.A. Arenou, F. bastian, U. Cropper, M. Drimmel, R. Katz, D. Lattanzi, M.G. bakker, J. Cacciari, C. Castañeda, J. Chaoul, L. Cheek, N. Fabricius, C. Guerra, R. Holl, b. Masana, e. Messineo, R. Mowlavi, N. Nienartowicz, K. Panuzzo, P. Riello, M. seabroke, G.M. Thévenin, F. Gracia-Abril, G. Comoretto, G. Garcia-Reinaldos, M. Teyssier, D. Altmann, M. Andrae, R. Audard, M. bellas-Velidis, I. benson, K. blomme, R. burgess, P. busso, G. Clementini, G. Clotet, M. Creevey, O. Davidson, M. De Ridder, J. Delchamb.e. L. Ducourant, C. Fernández-Hernández, J. Fouesneau, M. Frémat, Y. García-Torres, M. González-Núñez, J. González-Vidal, J.J. Gosset, e. Guy, L.P. Halbwachs, J.-L. Hambly, N.C. Harrison, D.L. Hodgkin, s.T. Hutton, A. Jasniewicz, G. Jean-Antoine-Piccolo, A. Jordan, s. Korn, A.J. Krone-Martins, A. Lanzafame, A.C. Leb.e.ter, T. Löffler, W. Manteiga, M. Marrese, P.M. Martín-Fleitas, J.M. Moitinho, A. Mora, A. Osinde, J. Pancino, e. Recio-blanco, A. Richards, P.J. Rimoldini, L. Robin, A.C. sarro, L.M. siopis, C. smith, M. sozzetti, A. süveges, M. Torra, J. Van Reeven, W. Abbas, U. Ab.e. Aramburu, A. Accart, s. Aerts, C. Altavilla, G. Álvarez, M.A. Alvarez, R. Alves, J. Anderson, R.I. Andrei, A.H. Anglada Varela, e. Antiche, e. Antoja, T. Arcay, b. Astraatmadja, T.L. bach, N. baker, s.G. balaguer-Núñez, L. balm, P. barache, C. barata, C. barbato, D. Université Côte d'Azur Observatoire de la Côte d'Azur CNRS Laboratoire Lagrange Bd de l'Observatoire CS 34229 Nice Cedex 406304 France IMCCE Observatoire de Paris Université PSL CNRS Sorbonne Universités Univ. Lille 77 Av. Denfert-Rochereau Paris75014 France 10025 Italy INAF - Osservatorio Astrofisico di Arcetri Largo Enrico Fermi 5 Firenze50125 Italy University of Helsinki Department of Physics P.O. Box 64 Helsinki00014 Finland Finnish Geospatial Research Institute FGI Geodeetinrinne 2 Masala02430 Finland Royal Observatory of Belgium Ringlaan 3 Brussels1180 Belgium Institut UTINAM UMR6213 CNRS OSU THETA Franche-Comté Bourgogne Université Bourgogne Franche-Comté Besançon25000 France Institute of Astronomy University of Cambridge Madingley Road CambridgeCB3 0HA United Kingdom CNES Centre Spatial de Toulouse 18 avenue Edouard Belin Toulouse Cedex 931401 France Department of Computer Science Electrical and Space Engineering Luleå University of Technology Box 848 KirunaS-981 28 Sweden Camino bajo del Castillo s/n Madrid28692 Spain Martí i Franquès 1 Barcelona08028 Spain AKKA for CNES Centre Spatial de Toulouse 18 avenue Edouard Belin Toulouse Cedex 931401 France Leiden Observatory Leiden University Niels Bohrweg 2 Leiden2333 CA Netherlands INAF - Osservatorio Astronomico di Padova Vicolo Osservatorio 5 Padova35122 Italy Keplerlaan 1 Noordwijk2201AZ Netherlands GEPI Observatoire de Paris Université PSL CNRS 5 Place Jules Janssen Meudon92190 France Univ. Grenoble Alpes CNRS IPAG Grenoble38000 France Max Planck Institute for Astronomy Königstuhl 17 Heidelberg69117 Germany Astronomisches Rechen-Institut Zentrum für Astronomie Universität Heidelberg Mönchhofstr. 12-14 Heidelberg69120 Germany Department of Astronomy University of Geneva Chemin des Maillettes 51 Versoix1290 Switzerland Keplerlaan 1 Noordwijk2201 AZ Netherlands Lohrmann Observatory Technische Universität Dresden Mommsenstraße 13 Dresden010

Context. The Gaia spacecraft of the european space Agency (esA) has b.e. securing ob.e.vations of solar system ob.e.ts (ssOs) since the beginning of its operations. Data Release 2 (DR2) contains the ob.e.vations of a selected sample of 14,099 ssOs. These asteroids have b.e. already identified and have b.e. numbered by the Minor Planet Center repository. Positions are provided for each Gaia ob.e.vation at CCD level. As additional information, complementary to astrometry, the apparent brightness of ssOs in the unfiltered G band is also provided for selected ob.e.vations. Aims. We explain the processing of ssO data, and describe the criteria we used to select the sample published in Gaia DR2. We then explore the data set to assess its quality. Methods. To exploit the main data product for the solar system in Gaia DR2, which is the epoch astrometry of asteroids, it is necessary to take into account the unusual properties of the uncertainty, as the position information is nearly one-dimensional. When this aspect is handled appropriately, an orbit fit can be obtained with post-fit residuals that are overall consistent with the a-priori error model that was used to define individual values of the astrometric uncertainty. The role of both random and systematic errors is described. The distribution of residuals allowed us to identify possib.e.contaminants in the data set (such as stars). Photometry in the G band was compared to computed values from reference asteroid shapes and to the flux registered at the corresponding epochs by the red and blue photometers (RP and bP). Results. The overall astrometric performance is close to the expectations, with an optimal range of brightness G ∼ 12 - 17. In this range, the typical transit-level accuracy is well below 1 mas. For fainter asteroids, the growing photon noise deteriorates the performance. Asteroids brighter than G ∼ 12 are affected by a lower performance of the processing of their signals. The dramatic improvement brought b

关键词： Orbits

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search for Physics beyond the standard Model in events with Overlapping Photons and Jets

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Physical Review Letters 2019年第24期123卷 241801-241801页

作者： A. M. sirunyan A. Tumasyan W. Adam F. Ambrogi T. bergauer J. brandstetter M. Dragicevic J. erö A. escalante Del Valle M. Flechl R. Frühwirth M. Jeitler N. Krammer I. Krätschmer D. Liko T. Madlener I. Mikulec N. Rad J. schieck R. schöfbeck M. spanring D. spitzbart W. Waltenberger C.-e. Wulz M. Zarucki V. Drugakov V. Mossolov J. suarez Gonzalez M. R. Darwish e. A. De Wolf D. Di Croce X. Janssen J. Lauwers A. Lelek M. Pieters H. Rejeb sfar H. Van Haevermaet P. Van Mechelen s. Van Putte N. Van Remortel F. b.e.man e. s. bols s. s. Chhibra J. D’Hondt J. De Clercq D. Lontkovskyi s. Lowette I. Marchesini s. Moortgat L. Moreels Q. Python K. skovpen s. Tavernier W. Van Doninck P. Van Mulders I. Van Parijs D. beghin b. bilin H. brun b. Clerbaux G. De Lentdecker H. Delannoy b. Dorney L. Favart A. Grebenyuk A. K. Kalsi J. Luetic A. Popov N. Postiau e. starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom Q. Wang T. Cornelis D. Dobur I. Khvastunov C. Roskas D. Trocino M. Tytgat W. Verbeke b. Vermassen M. Vit N. Zaganidis O. bondu G. bruno C. Caputo P. David C. Delaere M. Delcourt A. Giammanco V. Lemaitre A. Magitteri J. Prisciandaro A. saggio M. Vidal Marono P. Vischia J. Zobec F. L. Alves G. A. Alves G. Correia silva C. Hensel A. Moraes P. Rebello Teles e. belchior batista Das Chagas W. Carvalho J. Chinellato e. Coelho e. M. Da Costa G. G. Da silveira D. De Jesus Damiao C. De Oliveira Martins s. Fonseca De souza L. M. Huertas Guativa H. Malbouisson J. Martins D. Matos Figueiredo M. Medina Jaime M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima W. L. Prado Da silva L. J. sanchez Rosas A. santoro A. sznajder M. Thiel e. J. Tonelli Manganote F. Torres Da silva De Araujo A. Vilela Pereira s. Ahuja 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 R. Hadjiiska P. Iaydjiev A. Marinov M. Misheva M. Rodozov M. shopova G. sultanov M. bonchev A. Dimitrov T. Ivanov L. Litov b. Pavlov P. Petkov W. Fang X. Gao L. Yuan M. Ah 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 The University of Kansas Lawrence Kansas USA 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 National Centre for Physics Quaid-I-Azam University Islamabad Pakistan Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Tsinghua University Beijing China University of Virginia Charlottesville Virginia USA 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 National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Université Paris-Saclay Gif-sur-Yvette France Laboratoire Le

Results are reported from a search for new particles that decay into a photon and two gluons, in events with jets. Novel jet substructure techniques are developed that allow photons to be identified in an environment densely populated with hadrons. The analyzed proton-proton collision data were collected by the CMs experiment at the LHC, in 2016 at s=13 TeV, and correspond to an integrated luminosity of 35.9 fb−1. The spectra of total transverse hadronic energy of candidate events are examined for deviations from the standard model predictions. No statistically significant excess is ob.e.ved over the expected background. The first cross section limits on new physics processes resulting in such events are set. The results are interpreted as upper limits on the rate of gluino pair production, utilizing a simplified stealth supersymmetry model. The excluded gluino masses extend up to 1.7 TeV, for a neutralino mass of 200 GeV and exceed previous mass constraints set by analyses targeting events with isolated photons.

关键词： Quark & gluon jets Hypothetical particles Photons superpartners Hadron colliders

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search for a Light Charged Higgs boson Decaying to a W boson and a CP-Odd Higgs boson in Final states with eμμ or μμμ in Proton-Proton Collisions at s=13 TeV

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Physical Review Letters 2019年第13期123卷 131802-131802页

作者： A. M. sirunyan A. Tumasyan W. Adam F. Ambrogi T. bergauer J. brandstetter M. Dragicevic J. erö A. escalante Del Valle M. Flechl R. Frühwirth M. Jeitler N. Krammer I. Krätschmer D. Liko T. Madlener I. Mikulec N. Rad J. schieck R. schöfbeck M. spanring D. spitzbart W. Waltenberger J. Wittmann C.-e. Wulz M. Zarucki V. Drugakov V. Mossolov J. suarez Gonzalez M. R. Darwish e. A. De Wolf D. Di Croce X. Janssen J. Lauwers A. Lelek M. Pieters H. Van Haevermaet P. Van Mechelen s. Van Putte N. Van Remortel F. b.e.man e. s. bols s. s. Chhibra J. D’Hondt J. De Clercq G. Flouris D. Lontkovskyi s. Lowette I. Marchesini s. Moortgat L. Moreels Q. Python K. skovpen s. Tavernier W. Van Doninck P. Van Mulders I. Van Parijs D. beghin b. bilin H. brun b. Clerbaux G. De Lentdecker H. Delannoy b. Dorney L. Favart A. Grebenyuk A. K. Kalsi J. Luetic A. Popov N. Postiau e. starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom Q. Wang T. Cornelis D. Dobur I. Khvastunov C. Roskas D. Trocino M. Tytgat W. Verbeke b. Vermassen M. Vit N. Zaganidis O. bondu G. bruno C. Caputo P. David C. Delaere M. Delcourt A. Giammanco G. Krintiras V. Lemaitre A. Magitteri K. Piotrzkowski J. Prisciandaro A. saggio M. Vidal Marono P. Vischia J. Zobec F. L. Alves G. A. Alves G. Correia silva C. Hensel A. Moraes P. Rebello Teles e. belchior batista Das Chagas W. Carvalho J. Chinellato e. Coelho e. M. Da Costa G. G. Da silveira D. De Jesus Damiao C. De Oliveira Martins s. Fonseca De souza L. M. Huertas Guativa H. Malbouisson J. Martins D. Matos Figueiredo M. Medina Jaime M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima W. L. Prado Da silva L. J. sanchez Rosas A. santoro A. sznajder M. Thiel e. J. Tonelli Manganote F. Torres Da silva De Araujo A. Vilela Pereira s. Ahuja C. A. bernardes L. Calligaris D. De souza Lemos T. R. Fernandez Perez Tomei e. M. Gregores P. G. Mercadante s. F. Novaes sandra s. Padula A. Aleksandrov G. Antchev R. Hadjiiska P. Iaydjiev A. Marinov M. Misheva M. Rodozov M. shopova G. sultanov A. Dimitrov L. Litov b. Pavlov P. Petkov W. Fa 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 The University of Kansas Lawrence Kansas USA 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 National Centre for Physics Quaid-I-Azam University Islamabad Pakistan Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China University of Virginia Charlottesville Virginia USA 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 National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Université Paris-Saclay Gif-sur-Yvette France Laboratoire Leprince-Ringuet Ecole polytechnique

A search for a light charged Higgs boson (H+) decaying to a W boson and a CP-odd Higgs boson (A) in final states with eμμ or μμμ is performed using data from pp collisions at s=13 TeV, recorded by the CMs detector at the LHC and corresponding to an integrated luminosity of 35.9 fb−1. In this search, it is assumed that the H+ boson is produced in decays of top quarks, and the A boson decays to two oppositely charged muons. The presence of signals for H+ boson masses between 100 and 160 GeV and A boson masses between 15 and 75 GeV is investigated. No evidence for the production of the H+ boson is found. Upper limits at 95% confidence level are obtained on the combined branching fraction for the decay chain, t→bH+→bW+A→bW+μ+μ−, of 1.9×10−6 to 8.6×10−6, depending on the masses of the H+ and A bosons. These are the first limits for these decay modes of the H+ and A bosons.

关键词： Higgs bosons Hypothetical gauge bosons Top quark Hadron colliders

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search for Low-Mass Quark-Antiquark Resonances Produced in Association with a Photon at s=13 TeV

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Physical Review Letters 2019年第23期123卷 231803-231803页

作者： A. M. sirunyan A. Tumasyan W. Adam F. Ambrogi T. bergauer J. brandstetter M. Dragicevic J. erö A. escalante Del Valle M. Flechl R. Frühwirth M. Jeitler N. Krammer I. Krätschmer D. Liko T. Madlener I. Mikulec N. Rad J. schieck R. schöfbeck M. spanring D. spitzbart W. Waltenberger J. Wittmann C.-e. Wulz M. Zarucki V. Drugakov V. Mossolov J. suarez Gonzalez M. R. Darwish e. A. De Wolf D. Di Croce X. Janssen J. Lauwers A. Lelek M. Pieters H. Van Haevermaet P. Van Mechelen s. Van Putte N. Van Remortel F. b.e.man e. s. bols s. s. Chhibra J. D’Hondt J. De Clercq G. Flouris D. Lontkovskyi s. Lowette I. Marchesini s. Moortgat L. Moreels Q. Python K. skovpen s. Tavernier W. Van Doninck P. Van Mulders I. Van Parijs D. beghin b. bilin H. brun b. Clerbaux G. De Lentdecker H. Delannoy b. Dorney L. Favart A. Grebenyuk A. K. Kalsi J. Luetic A. Popov N. Postiau e. starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom Q. Wang T. Cornelis D. Dobur I. Khvastunov C. Roskas D. Trocino M. Tytgat W. Verbeke b. Vermassen M. Vit N. Zaganidis O. bondu G. bruno C. Caputo P. David C. Delaere M. Delcourt A. Giammanco G. Krintiras V. Lemaitre A. Magitteri K. Piotrzkowski J. Prisciandaro A. saggio M. Vidal Marono P. Vischia J. Zobec F. L. Alves G. A. Alves G. Correia silva C. Hensel A. Moraes P. Rebello Teles e. belchior batista Das Chagas W. Carvalho J. Chinellato e. Coelho e. M. Da Costa G. G. Da silveira D. De Jesus Damiao C. De Oliveira Martins s. Fonseca De souza L. M. Huertas Guativa H. Malbouisson J. Martins D. Matos Figueiredo M. Medina Jaime M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima W. L. Prado Da silva L. J. sanchez Rosas A. santoro A. sznajder M. Thiel e. J. Tonelli Manganote F. Torres Da silva De Araujo A. Vilela Pereira s. Ahuja C. A. bernardes L. Calligaris D. De souza Lemos T. R. Fernandez Perez Tomei e. M. Gregores P. G. Mercadante s. F. Novaes sandra s. Padula A. Aleksandrov G. Antchev R. Hadjiiska P. Iaydjiev A. Marinov M. Misheva M. Rodozov M. shopova G. sultanov A. Dimitrov L. Litov b. Pavlov P. Petkov W. Fa 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 The University of Kansas Lawrence Kansas USA 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 National Centre for Physics Quaid-I-Azam University Islamabad Pakistan Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China University of Virginia Charlottesville Virginia USA 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 National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Université Paris-Saclay Gif-sur-Yvette France Laboratoire Leprince-Ringuet Ecole polytechnique

A search for narrow low-mass resonances decaying to quark-antiquark pairs is presented. The search is based on proton-proton collision events collected at 13 TeV by the CMs detector at the CeRN LHC. The data sample corresponds to an integrated luminosity of 35.9 fb−1, recorded in 2016. The search considers the case where the resonance has high transverse momentum due to initial-state radiation of a hard photon. To study this process, the decay products of the resonance are reconstructed as a single large-radius jet with two-pronged substructure. The signal would be identified as a localized excess in the jet invariant mass spectrum. No evidence for such a resonance is ob.e.ved in the mass range 10 to 125 GeV. Upper limits at the 95% confidence level are set on the coupling strength of resonances decaying to quark pairs. The results obtained with this photon trigger strategy provide the first direct constraints on quark-antiquark resonance masses below 50 GeV obtained at a hadron collider.

关键词： Quark & gluon jets Hypothetical gauge bosons Photons Hadron colliders

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Analysis of performance enhancement on graphic processor based heterogeneous architecture: A CUDA and MATLAb.e.periment

Analysis of performance enhancement on graphic processor bas...

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National Conference on Parallel Computing Technologies

作者： Vilas H. Naik Chidanand s. Kusur Department of Computer Science and Engineering Basaveshwar Engineering College Bagalkot Karnataka India Department of Computer Science and Engineering B.L.D.E.A's College of Engineering and Technology Bijapur Karnataka India

Today multiprocessors, multicores, clusters and heterogeneous computing are becoming the most popular architectures to achieve high performance computing. The different approaches are made by system designers to enhance the system performance such as increasing clock frequency of CPUs from MHz to GHz and addition of more number of CPU cores i.e from single core processor to dual core, quad core, hexa core, octo core, ten core and more processors. still, multicore processing creates some challenges of its own. The extra core results into increased processor size and also high power consumption. Meanwhile, General Purpose Graphics Processing Units (GPGPUs) are designed and implemented that contain hundreds of cores with more number of Arithmetic and Logic Units and Control Units. These GPGPUs can be used in addition to CPU for heterogeneous computing for the enhancement of system performance for selected applications by data parallelism. The heterogeneous programming environment that includes other processors like GPGPU in addition to CPU can be used to enhance the execution performance of computational intensive programs. so, it is necessary for the programmer to run and analyze the selected computational intensive programs on both homogeneous and heterogeneous programming platform. The homogeneous programming environment makes the use of multi core CPU, where as the heterogeneous programming environment makes the use of different processors such as General Purpose Graphics Processing Unit (GPGPUs), Field Programmab.e.Gate Arrays (FPGAs), Digital signal Processors (DsPs) in addition to CPU. Hence, the programmer needs to write the code that makes the use of both CPU and other processors by using heterogeneous software environment such as parallel MATLAb with GPU enab.e. functions, MATLAb supported CUDA kernels and CUDA C for the execution of parallel code to achieve high performance in heterogeneous programming environment in comparison with homogeneous (sequential)

关键词： Graphics processing units MATLAb Programming environments Parallel processing Multicore processing Central Processing Unit

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

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Physical Review D 2019年第7期100卷 072007-072007页

作者： A. M. sirunyan A. Tumasyan W. Adam F. Ambrogi T. bergauer J. brandstetter M. Dragicevic J. erö A. escalante Del Valle M. Flechl R. Frühwirth M. Jeitler N. Krammer I. Krätschmer D. Liko T. Madlener I. Mikulec N. Rad J. schieck R. schöfbeck M. spanring D. spitzbart W. Waltenberger J. Wittmann C.-e. Wulz M. Zarucki V. Drugakov V. Mossolov J. suarez Gonzalez M. R. Darwish e. A. De Wolf D. Di Croce X. Janssen J. Lauwers A. Lelek M. Pieters H. Rejeb sfar H. Van Haevermaet P. Van Mechelen s. Van Putte N. Van Remortel F. b.e.man e. s. bols s. s. Chhibra J. D’Hondt J. De Clercq D. Lontkovskyi s. Lowette I. Marchesini s. Moortgat L. Moreels Q. Python K. skovpen s. Tavernier W. Van Doninck P. Van Mulders I. Van Parijs D. beghin b. bilin H. brun b. Clerbaux G. De Lentdecker H. Delannoy b. Dorney L. Favart A. Grebenyuk A. K. Kalsi J. Luetic A. Popov N. Postiau e. starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom Q. Wang T. Cornelis D. Dobur I. Khvastunov C. Roskas D. Trocino M. Tytgat W. Verbeke b. Vermassen M. Vit N. Zaganidis O. bondu G. bruno C. Caputo P. David C. Delaere M. Delcourt A. Giammanco V. Lemaitre A. Magitteri J. Prisciandaro A. saggio M. Vidal Marono P. Vischia J. Zobec F. L. Alves G. A. Alves G. Correia silva C. Hensel A. Moraes P. Rebello Teles e. belchior batista Das Chagas W. Carvalho J. Chinellato e. Coelho e. M. Da Costa G. G. Da silveira D. De Jesus Damiao C. De Oliveira Martins s. Fonseca De souza L. M. Huertas Guativa H. Malbouisson J. Martins D. Matos Figueiredo M. Medina Jaime M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima W. L. Prado Da silva L. J. sanchez Rosas A. santoro A. sznajder M. Thiel e. J. Tonelli Manganote F. Torres Da silva De Araujo A. Vilela Pereira s. Ahuja 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 R. Hadjiiska P. Iaydjiev A. Marinov M. Misheva M. Rodozov M. shopova G. sultanov A. Dimitrov L. Litov b. Pavlov P. Petkov W. Fang X. Gao L. Yuan M. Ahmad G. 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 The University of Kansas Lawrence Kansas USA 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 National Centre for Physics Quaid-I-Azam University Islamabad Pakistan Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Tsinghua University Beijing China University of Virginia Charlottesville Virginia USA 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 National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Université Paris-Saclay Gif-sur-Yvette France Laboratoire Le

Results are presented for an extraction of the top quark Yukawa coupling from top quark-antiquark (tt¯) kinematic distributions in the lepton plus jets final state in proton-proton collisions, based on data collected by the CMs experiment at the LHC at s=13 TeV, corresponding to an integrated luminosity of 35.8 fb−1. Corrections from weak boson exchange, including Higgs bosons, between the top quarks can produce large distortions of differential distributions near the energy threshold of tt¯ production. Therefore, precise measurements of these distributions are sensitive to the Yukawa coupling. Top quark events are reconstructed with at least three jets in the final state, and a novel technique is introduced to reconstruct the tt¯ system for events with one missing jet. This technique enhances the experimental sensitivity in the low invariant mass region, Mtt¯. The data yields in Mtt¯, the rapidity difference |yt−yt¯|, and the number of reconstructed jets are compared with distributions representing different Yukawa couplings. These comparisons are used to measure the ratio of the top quark Yukawa coupling to its standard model predicted value to be 1.07−0.43+0.34 with an upper limit of 1.67 at the 95% confidence level.

关键词： Higgs bosons Top quark Hadron colliders

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search for vectorlike leptons in multilepton final states in proton-proton collisions at s=13 TeV

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Physical Review D 2019年第5期100卷 052003-052003页

A search for vectorlike leptons in multilepton final states is presented. The data sample corresponds to an integrated luminosity of 77.4 fb−1 of proton-proton collisions at a center-of-mass energy of 13 TeV collected by the CMs experiment at the LHC in 2016 and 2017. events are categorized by the multiplicity of electrons, muons, and hadronically decaying τ leptons. The missing transverse momentum and the scalar sum of the lepton transverse momenta are used to distinguish the signal from background. The ob.e.ved results are consistent with the expectations from the standard model hypothesis. The existence of a vectorlike lepton doub.e., coupling to the third-generation standard model leptons in the mass range of 120–790 GeV, is excluded at 95% confidence level. These are the most stringent limits yet on the production of a vectorlike lepton doub.e., coupling to the third-generation standard model leptons.

关键词： Hypothetical fermions Hadron colliders

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search for long-lived particles using delayed photons in proton-proton collisions at s=13 TeV

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Physical Review D 2019年第11期100卷 112003-112003页

作者： A. M. sirunyan A. Tumasyan W. Adam F. Ambrogi T. bergauer J. brandstetter M. Dragicevic J. erö A. escalante Del Valle M. Flechl R. Frühwirth M. Jeitler N. Krammer I. Krätschmer D. Liko T. Madlener I. Mikulec N. Rad J. schieck R. schöfbeck M. spanring D. spitzbart W. Waltenberger C.-e. Wulz M. Zarucki V. Drugakov V. Mossolov J. suarez Gonzalez M. R. Darwish e. A. De Wolf D. Di Croce X. Janssen A. Lelek M. Pieters H. Rejeb sfar H. Van Haevermaet P. Van Mechelen s. Van Putte N. Van Remortel F. b.e.man e. s. bols s. s. Chhibra J. D’Hondt J. De Clercq D. Lontkovskyi s. Lowette I. Marchesini s. Moortgat Q. Python K. skovpen s. Tavernier W. Van Doninck P. Van Mulders D. beghin b. bilin H. brun b. Clerbaux G. De Lentdecker H. Delannoy b. Dorney L. Favart A. Grebenyuk A. K. Kalsi A. Popov N. Postiau e. starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom T. Cornelis D. Dobur I. Khvastunov M. Niedziela C. Roskas D. Trocino M. Tytgat W. Verbeke b. Vermassen M. Vit O. bondu G. bruno C. Caputo P. David C. Delaere M. Delcourt A. Giammanco V. Lemaitre J. Prisciandaro A. saggio M. Vidal Marono P. Vischia J. Zobec F. L. Alves G. A. Alves G. Correia silva C. Hensel A. Moraes P. Rebello Teles e. belchior batista Das Chagas W. Carvalho J. Chinellato e. Coelho e. M. Da Costa G. G. Da silveira D. De Jesus Damiao C. De Oliveira Martins s. Fonseca De souza L. M. Huertas Guativa H. Malbouisson J. Martins D. Matos Figueiredo M. Medina Jaime M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima W. L. Prado Da silva L. J. sanchez Rosas A. santoro 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 R. Hadjiiska P. Iaydjiev M. Misheva M. Rodozov M. shopova G. sultanov M. bonchev A. Dimitrov T. Ivanov L. Litov b. Pavlov P. Petkov W. Fang X. Gao L. Yuan G. M. Chen H. s. Chen M. Chen C. H. Jiang D. Leggat H. Liao Z. Liu A. spiezia J. Tao e. Yazg 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 Santo André 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 Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China The University of Kansas Lawrence Kansas USA National Centre for Physics Quaid-I-Azam University Islamabad Pakistan Tsinghua University Beijing China University of Virginia Charlottesville Virginia USA 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 National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Université P

A search for long-lived particles decaying to photons and weakly interacting particles, using proton-proton collision data at s=13 TeV collected by the CMs experiment in 2016–2017 is presented. The data set corresponds to an integrated luminosity of 77.4 fb−1. Results are interpreted in the context of supersymmetry with gauge-mediated supersymmetry b.e.king, where the neutralino is long-lived and decays to a photon and a gravitino. Limits are presented as a function of the neutralino proper decay length and mass. For neutralino proper decay lengths of 0.1, 1, 10, and 100 m, masses up to 320, 525, 360, and 215 GeV are excluded at 95% confidence level, respectively. We extend the previous best limits in the neutralino proper decay length by up to one order of magnitude, and in the neutralino mass by up to 100 GeV.

关键词： supersymmetric models Hadron colliders

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