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

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.ekman 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.eaking, 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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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.ekman 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 pair production of vectorlike quarks in the fully hadronic final state

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Physical Review D 2019年第7期100卷 072001-072001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.ekman 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

The results of two searches for pair production of vectorlike T or b quarks in fully hadronic final states are presented, using data from the CMS experiment at a center-of-mass energy of 13 TeV. The data were collected at the LHC during 2016 and correspond to an integrated luminosity of 35.9 fb−1. A cut-based analysis specifically targets the bW decay mode of the T quark and allows for the reconstruction of the T quark candidates. In a second analysis, a multiclassification algorithm, the “boosted event shape tagger,” is deployed to label candidate jets as originating from top quarks, and W, Z, and H. Candidate events are categorized according to the multiplicities of identified jets, and the scalar sum of all ob.erved jet momenta is used to discriminate signal events from the quantum chromodynamics multijet background. both analyses probe all possib.e branching fraction combinations of the T and b quarks and set limits at 95% confidence level on their masses, ranging from 740 to 1370 GeV. These results represent a significant improvement relative to existing searches in the fully hadronic final state.

关键词： Hypothetical particle physics models Quarks Hadron colliders

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Search for low mass vector resonances decaying into quark-antiquark pairs in proton-proton collisions at s=13 TeV

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Physical Review D 2019年第11期100卷 112007-112007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.ekman 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 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 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 M. Ahmad G. M. Chen H. S. Chen M. Chen C. H. Jiang D. Leggat H. Li Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista São Paulo Brazil Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China 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 The University of Kansas Lawrence Kansas USA 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 Paris-Saclay

A search for low mass narrow vector resonances decaying into quark-antiquark pairs is presented. The analysis is based on data collected in 2017 with the CMS detector at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 41.1 fb−1. The results of this analysis are combined with those of an earlier analysis based on data collected at the same collision energy in 2016, corresponding to 35.9 fb−1. Signal candidates will be recoiling against initial state radiation and are identified as energetic, large-radius jets with two pronged substructure. The invariant jet mass spectrum is probed for a potential narrow peaking signal over a smoothly falling background. No evidence for such resonances is ob.erved within the mass range of 50–450 GeV. Upper limits at the 95% confidence level are set on the coupling of narrow resonances to quarks, as a function of the resonance mass. For masses between 50 and 300 GeV these are the most sensitive limits to date. This analysis extends the earlier search to a mass range of 300–450 GeV, which is probed for the first time with jet substructure techniques.

关键词： Hypothetical particle physics models 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

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.ekman 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

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.erved results are consistent with the expectations from the standard model hypothesis. The existence of a vectorlike lepton doub.et, 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.et, coupling to the third-generation standard model leptons.

关键词： Hypothetical fermions Hadron colliders

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First measurements of beam backgrounds at superKeKb

arXiv

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arXiv 2018年

作者： Lewis, P.M. Jaegle, I. Nakayama, H. Aloisio, A. Ameli, F. barrett, M. beaulieu, A. bosisio, L. branchini, P. browder, T.e. budano, A. Cautero, G. Cecchi, C. Chen, Y.-T. Chu, K.-N. Cinabro, D. Cristaudo, P. de Jong, S. de Sangro, R. Finocchiaro, G. Flanagan, J. Funakoshi, Y. Gabriel, M. Giordano, R. Giuressi, D. Hedges, M.T. Honkanen, N. Ikeda, H. Ishibashi, T. Kaji, H. Kanazawa, K. Kiesling, C. Koirala, S. Križan, P. la Licata, C. Lanceri, L. Liau, J.-J. Lin, F.-H. Lin, J.-C. Liptak, Z. Longo, S. Manoni, e. Marinas, C. Miyabayashi, K. Mulyani, e. Morita, A. Nakao, M. Nayak, M. Ohnishi, Y. Passeri, A. Poffenberger, P. Ritzert, M. Roney, J.M. Rossi, A. Röder, T. Seddon, R.M. Seong, I.S. Shiu, J.-G. Simon, F. Soloviev, Y. Suetsugu, Y. Szalay, M. Terui, S. Tortone, G. Vahsen, S.e. van der Kolk, N. Vitale, L. Wang, M.-Z. Windel, H. Yokoyama, S. University of Bonn Institute of Physics Nußallee 12 Bonn53115 Germany Deutsches Elektronen-Synchrotron Notkestraße 85 Hamburg22607 Germany Elettra - Sincrotrone Trieste S.C.p.A. AREA Science Park BasovizzaTrieste34149 Italy University of Florida Department of Physics P.O. Box 118440 GainesvilleFL32611 United States 1-1 Oho Tsukuba Ibaraki305-0801 Japan University of Hawaii Department of Physics and Astronomy 2505 Correa Road HonoluluHI96822 United States Heidelberg University Institute of Computer Engineering B6 26 Mannheim68159 Germany Institute of Particle and Nuclear Studies Oho 1-1 Tsukuba Ibaraki305-0801 Japan Accelerator Laboratory Oho 1-1 Tsukuba Ibaraki305-0801 Japan INFN - Sez. di Perugia Via A. Pascoli Perugia06123 Italy INFN - Sez. ROMA P.le Aldo Moro 2 Roma00185 Italy INFN - Sez. ROMA 3 V. della Vasca Navale 84 Roma00146 Italy J. Stefan Institute Faculty of Mathematics and Physics University of Ljubljana Ljubljana1000 Slovenia Laboratori Nazionali di Frascati dell’INFN Via E. Fermi 40 FrascatiI-00044 Italy Max-Planck-Institut für Physik Föhringer Ring 6 München80805 Germany McGill University Department of Physics 3600 rue University MontréalQCH3A 2T8 Canada Univ. of Naples Federico II & INFN Sezione di Napoli Strada Comunale Cintia Napoli80126 Italy Nara Women’s University Nara630-8506 Japan National Taiwan University Department of Physics No.1 Sec.4 Roosevelt Road Taipei10617 Taiwan University of Trieste Department of Physics and INFN Via Valerio 2 Trieste34127 Italy University of Victoria Department of Physics and Astronomy 3800 Finnerty Rd. VictoriaBCV8P 5C2 Canada Wayne State University Department of Physics and Astronomy 666 W. Hancock DetroitMI48202 United States

The high design luminosity of the SuperKeKb.electron-positron collider is expected to result in challenging levels of beam-induced backgrounds in the interaction region. Properly simulating and mitigating these backgrounds is critical to the success of the belle II experiment. We report on measurements performed with a suite of dedicated beam background detectors, collectively known as beAST II, during the so-called Phase 1 commissioning run of SuperKeKb in 2016, which involved operation of both the high energy ring (HeR) of 7 GeV electrons as well as the low energy ring (LeR) of 4 GeV positrons. We describe the beAST II detector systems, the simulation of beam backgrounds, and the measurements performed. The measurements include standard ones of dose rates versus accelerator conditions, and more novel investigations, such as bunch-by-bunch measurements of injection backgrounds and measurements sensitive to the energy spectrum and angular distribution of fast neutrons. We ob.erve beam-gas, Touschek, beam-dust, and injection backgrounds. As there is no final focus of the beams in Phase 1, we do not ob.erve significant synchrotron radiation, as expected. Measured LeR beam-gas backgrounds and Touschek backgrounds in both rings are slightly elevated, on average three times larger than the levels predicted by simulation. HeR beam-gas backgrounds are on on average two orders of magnitude larger than predicted. Systematic uncertainties and channel-to-channel variations are large, so that these excesses constitute only 1-2 sigma level effects. Neutron background rates are higher than predicted and should be studied further. We will measure the remaining beam background processes, due to colliding beams, in the imminent commissioning Phase 2. These backgrounds are expected to be the most critical for belle II, to the point of necessitating replacement of detector components during the Phase 3 (full-luminosity) operation of SuperKeb. Copyright © 2018, The Authors. All rights

关键词： Germanium alloys

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Ob.ervations of solar system ob.ects

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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.ermann, 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.elter, 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.eu 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.en securing ob.ervations of solar system ob.ects (SSOs) since the beginning of its operations. Data Release 2 (DR2) contains the ob.ervations of a selected sample of 14,099 SSOs. These asteroids have b.en already identified and have b.en numbered by the Minor Planet Center repository. Positions are provided for each Gaia ob.ervation 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.ervations. 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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96.14 Wallis's product formula for π: a symbolic approach

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The Mathematical Gazette 2015年第535期96卷 127-129页

作者： Paul Levrie Department of Applied Engineering Karel de Grote University College B-2660 Hoboken Belgium Department of Computer Science KU Leuven B-3001 Heverlee Belgium e-mail:paul.levrie@cs.kuleuven.be

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Author Correction: A global database for metacommunity ecology, integrating species, traits, environment and space

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Scientific data 2020年第1期7卷 79页

作者： Alienor Jeliazkov Darko Mijatovic Stéphane Chantepie Nigel Andrew Raphaël Arlettaz Luc barbaro Nadia barsoum Alena bartonova elena belskaya Núria bonada Anik brind'Amour Rodrigo Carvalho Helena Castro Damian Chmura Philippe Choler Karen Chong-Seng Daniel Cleary Anouk Cormont William Cornwell Ramiro de Campos Nicole de Voogd Sylvain Doledec Joshua Drew Frank Dziock Anthony eallonardo Melanie J edgar Fábio Farneda Domingo Flores Hernandez Cédric Frenette-Dussault Guillaume Fried belinda Gallardo Heloise Gibb Thiago Gonçalves-Souza Janet Higuti Jean-Yves Humbert boris R Krasnov eric Le Saux Zoe Lindo Adria Lopez-baucells elizabeth Lowe bryndis Marteinsdottir Koen Martens Peter Meffert Andres Mellado-Díaz Myles H M Menz Christoph F J Meyer Julia Ramos Miranda David Mouillot Alessandro Ossola Robin Pakeman Sandrine Pavoine burak Pekin Joan Pino Arnaud Pocheville Francesco Pomati Peter Poschlod Honor C Prentice Oliver Purschke Valerie Raevel Triin Reitalu Willem Renema Ignacio Ribera Natalie Robinson bjorn Robroek Ricardo Rocha Sen-Her Shieh Rebecca Spake Monika Staniaszek-Kik Michal Stanko Francisco Leonardo Tejerina-Garro Cajo Ter braak Mark C Urban Roel van Klink Sébastien Villéger Ruut Wegman Martin J Westgate Jonas Wolff Jan Żarnowiec Maxim Zolotarev Jonathan M Chase German Centre for Integrative Biodiversity Research (iDiv) Deutscher Platz 5E 04103 Leipzig Germany. alienor.jeliazkov@***. Department of Computer Science Martin Luther University Halle-Wittenberg 06099 Halle Salle Germany. alienor.jeliazkov@***. German Centre for Integrative Biodiversity Research (iDiv) Deutscher Platz 5E 04103 Leipzig Germany. Department of Evolutionary Biology and Environmental Studies University of Zürich Winterthurerstrasse 190 8057 Zurich Switzerland. Zoology University of New England Armidale NSW 2351 Australia. Division of Conservation Biology Institute of Ecology and Evolution University of Bern 3012 Bern Switzerland. Dynafor INRA-INPT Univ. Toulouse Auzeville France. Centre d'Ecologie et des Sciences de la Conservation (CESCO) Muséum National d'Histoire Naturelle CNRS Sorbonne Université Paris France. Centre for Ecosystems Society and Biosecurity Forest Research Alice Holt Lodge Farnham Surrey GU10 4LH UK. Biology Centre CAS Czech Academy of Sciences Institute of Entomology Branisovska 31 370 05 Ceske Budejovice Czech Republic. University of South Bohemia in Ceske Budejovice Faculty of Science Branisovska 1760 370 05 Ceske Budejovice Czech Republic. Institute of Plant and Animal Ecology Ural Branch Russian Academy of Sciences Eighth March Street 202 Yekaterinburg 620144 Russia. Grup de Recerca "Freshwater Ecology Hydrology and Management" (FEHM) Departament de Biologia Evolutiva Ecologia i Ciències Ambientals Facultat de Biologia Institut de Recerca de la Biodiversitat (IRBio) Universitat de Barcelona (UB) Diagonal 643 08028 Barcelona Catalonia Spain. Unité Écologie et Modèles pour l'Halieutique IFREMER Rue de l'île d'Yeu B.P. 21105 44311 Nantes Cedex 03 France. Departamento de Biologia Universidade Estadual de Goiás Campus Palmeiras de Goiás Palmeiras de Goiás Goiás Brazil. Universidade Estadual de Goiás (UEG) Programa de Pós-Graduação em Recursos Naturais do Cerrado (RENAC) Campus de Ciências Exatas

An amendment to this paper has b.en published and can be accessed via a link at the top of the paper.

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A Survey on the Current Status and Future Challenges towards Ob.ective Skills Assessment in endovascular Surgery

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Journal of Medical Robotics Research 2016年第3期1卷

作者： Mazomenos, evangelos b. Chang, Ping-Lin Rolls, Alexander Hawkes, David J. bicknell, Colin D. Poorten, emmanuel Vander Riga, Celia V. Desjardins, Adrien Stoyanov, Danail Centre for Medical Image Computing Department of Computer Science University College London London WC1E 6BT United Kingdom Division of Surgery Department of Surgery and Cancer Imperial College London London SW7 2AZ United Kingdom Department of Medical Physics and Bioengineering University College London London WC1E 6BT United Kingdom Department of Mechanical Engineering KU Leuven Celestijnenlaan 300B Heverlee 3001 Belgium

Minimally invasive endovascular interventions have evolved rapidly over the past decade, facilitated by b.eakthroughs in medical imaging and sensing, instrumentation and most recently robotics. Catheter-based operations are potentially safer and applicab.e to a wider patient population due to the reduced comorbidity. As a result endovascular surgery has become the preferred treatment option for conditions previously treated with open surgery and as such the number of patients undergoing endovascular interventions is increasing every year. This fact coupled with a proclivity for reduced working hours results in a requirement for efficient training and assessment of new surgeons, that deviates from the "see one, do one, teach one" model introduced by William Halsted, so that trainees obtain operational expertise in a shorter period. Developing more ob.ective assessment tools based on quantitative metrics is now a recognized need in interventional training and this manuscript reports the current literature for endovascular skills assessment and the associated emerging technologies. A systematic search was performed on Pub.ed (MeDLINe), Google Scholar, IeeXplore and known journals using the keywords, "endovascular surgery", "surgical skills", "endovascular skills", "surgical training endovascular" and "catheter skills". Focusing explicitly on endovascular surgical skills, we group related works into three categories based on the metrics used;structured scales and checklists, simulation-based and motion-based metrics. This review highlights the key findings in each category and also provides suggestions for new research opportunities towards fully ob.ective and automated surgical assessment solutions. © 2016 World Scientific Publishing Company.

关键词： endovascular surgical skills medical imaging minimally invasive surgery surgical robotics surgical training

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