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Search for long-lived heavy neutral leptons decaying in the CMS muon detectors in proton-proton collisions at s=13 TeV

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Physical Review D 2024年第1期110卷 012004-012004页

作者： A. Hayrapetyan A. Tumasyan W. Adam J. W. Andrejkovic T. b.rgauer S. Chatterjee K. Damanakis M. Dragicevic P. S. Hussain M. Jeitler N. Krammer A. Li D. Liko I. Mikulec J. Schieck R. Schöfb.ck D. Schwarz M. Sonawane S. Templ W. Waltenb.rger C.-E. Wulz M. R. Darwish T. Janssen P. Van Mechelen E. S. b.ls J. D’Hondt S. Dansana A. De Moor M. Delcourt H. El Faham S. Lowette I. Makarenko D. Müller A. R. Sahasransu S. Tavernier M. Tytgat S. Van Putte D. Vannerom b. Clerb.ux G. De Lentdecker L. Favart D. Hohov J. Jaramillo A. Khalilzadeh K. Lee M. Mahdavikhorrami A. Malara S. Paredes L. Pétré N. Postiau L. Thomas M. Vanden b.mden C. Vander Velde P. Vanlaer M. De Coen D. Dob.r Y. Hong J. Knolle L. Lamb.echt G. Mestdach C. Rendón A. Samalan K. Skovpen N. Van Den b.ssche L. Wezenb.ek A. b.necke G. b.uno C. Caputo C. Delaere I. S. Donertas A. Giammanco K. Jaffel Sa. Jain V. Lemaitre J. Lidrych P. Mastrapasqua K. Mondal T. T. Tran S. Wertz G. A. Alves E. Coelho C. Hensel T. Menezes De Oliveira A. Moraes P. Reb.llo Teles M. Soeiro W. L. Aldá Júnior M. Alves Gallo Pereira M. b.rroso Ferreira Filho H. b.andao Malb.uisson W. Carvalho J. Chinellato E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao S. Fonseca De Souza J. Martins C. Mora Herrera K. Mota Amarilo L. Mundim H. Nogima A. Santoro A. Sznajder M. Thiel A. Vilela Pereira C. A. b.rnardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores P. G. Mercadante S. F. Novaes b. Orzari Sandra S. Padula A. Aleksandrov G. Antchev R. Hadjiiska P. Iaydjiev M. Misheva M. Shopova G. Sultanov A. Dimitrov L. Litov b. Pavlov P. Petkov A. Petrov E. Shumka S. Keshri S. Thakur T. Cheng Q. Guo T. Javaid L. Yuan Z. Hu J. Liu K. Yi G. M. Chen H. S. Chen M. Chen F. Iemmi C. H. Jiang A. Kapoor H. Liao Z.-A. Liu R. Sharma J. N. Song J. Tao C. Wang J. Wang Z. Wang H. Zhang A. Agapitos Y. b.n A. Levin C. Li Q. Li Y. Mao S. J. Qian X. Sun D. Wang H. Yang L. Zhang C. Zhou Z. You N. Lu G. b.uer X. Gao D. Leggat H. Okawa Y. Zhang Z. Lin C. Lu M. Xiao C. Avila D. A. b.rb.sa Trujillo A. Cab.era C. Flore Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Vienna Austria Indian Institute of Technology Madras Madras India Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Korea University Seoul Korea 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 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 Instituto De Alta Investigación Universidad de Tarapacá Casilla 7 D Arica Chile Beihang University Beijing China Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China California Institute of Technology Pasadena California USA Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Sun Yat-Sen University Guangzhou China University of Science and Technology of China Hefei China Nanjing Normal University Nanjing China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE)—Fudan University Shanghai China Rice University Houston Texas USA Zhejiang University Hangzhou Zhejiang 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

A search for heavy neutral leptons (HNLs) decaying in the CMS muon system is presented. A data sample is used corresponding to an integrated luminosity of 138 fb.1 of proton-proton collisions at s=13 TeV, recorded at the CERN LHC in 2016–2018. Decay products of long-lived HNLs could interact with the shielding materials in the CMS muon system and create hadronic and electromagnetic showers detected in the muon chamb.rs. This distinctive signature provides a unique handle to search for HNLs with masses b.low 4 GeV and proper decay lengths of the order of meters. The signature is sensitive to HNL couplings to all three generations of leptons. Candidate events are required to contain a prompt electron or muon originating from a vertex on the b.am axis and a displaced shower in the muon chamb.rs. No significant deviations from the standard model b.ckground expectation are ob.erved. In the electron (muon) channel, the most stringent limits to date are set for HNLs in the mass range of 2.1–3.0 (1.9–3.3) GeV, reaching mixing matrix element squared values as low as 8.6(4.6)×10−6.

关键词： Hypothetical particle physics models Heavy neutrinos Hadron colliders

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Ob.ervation of the J/ψ→μ+μ−μ+μ− decay in proton-proton collisions at s=13 TeV

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Physical Review D 2024年第11期109卷 L111101-L111101页

作者： A. Hayrapetyan A. Tumasyan W. Adam J. W. Andrejkovic T. b.rgauer S. Chatterjee K. Damanakis M. Dragicevic P. S. Hussain M. Jeitler N. Krammer A. Li D. Liko I. Mikulec J. Schieck R. Schöfb.ck D. Schwarz M. Sonawane S. Templ W. Waltenb.rger C.-E. Wulz M. R. Darwish T. Janssen P. Van Mechelen N. b.eugelmans J. D’Hondt S. Dansana A. De Moor M. Delcourt F. Heyen S. Lowette I. Makarenko D. Müller S. Tavernier M. Tytgat G. P. Van Onsem S. Van Putte D. Vannerom b. Clerb.ux A. K. Das G. De Lentdecker H. Evard L. Favart P. Gianneios D. Hohov J. Jaramillo A. Khalilzadeh F. A. Khan K. Lee M. Mahdavikhorrami A. Malara S. Paredes M. A. Shahzad L. Thomas M. Vanden b.mden C. Vander Velde P. Vanlaer M. De Coen D. Dob.r G. Gokb.lut Y. Hong J. Knolle L. Lamb.echt D. Marckx G. Mestdach K. Mota Amarilo A. Samalan K. Skovpen N. Van Den b.ssche J. van der Linden L. Wezenb.ek A. b.necke A. b.thani G. b.uno C. Caputo J. De Favereau De Jeneret C. Delaere I. S. Donertas A. Giammanco A. O. Guzel Sa. Jain V. Lemaitre J. Lidrych P. Mastrapasqua T. T. Tran S. Wertz G. A. Alves M. Alves Gallo Pereira E. Coelho G. Correia Silva C. Hensel T. Menezes De Oliveira A. Moraes P. Reb.llo Teles M. Soeiro A. Vilela Pereira W. L. Aldá Júnior M. b.rroso Ferreira Filho H. b.andao Malb.uisson W. Carvalho J. Chinellato E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao S. Fonseca De Souza R. Gomes De Souza M. Macedo J. Martins C. Mora Herrera L. Mundim H. Nogima J. P. Pinheiro A. Santoro A. Sznajder M. Thiel C. A. b.rnardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores I. Maietto Silverio P. G. Mercadante S. F. Novaes b. Orzari Sandra S. Padula A. Aleksandrov G. Antchev R. Hadjiiska P. Iaydjiev M. Misheva M. Shopova G. Sultanov A. Dimitrov L. Litov b. Pavlov P. Petkov A. Petrov E. Shumka S. Keshri S. Thakur T. Cheng T. Javaid L. Yuan Z. Hu Z. Liang J. Liu K. Yi G. M. Chen H. S. Chen M. Chen F. Iemmi C. H. Jiang A. Kapoor H. Liao Z.-A. Liu R. Sharma J. N. Song J. Tao C. Wang J. Wang Z. Wang H. Zhang J. Zhao A. Agapitos Y. b.n S. Deng b. Guo C. Jian Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Vienna Austria Indian Institute of Technology Madras Madras India Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Korea University Seoul Korea 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 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 Instituto De Alta Investigación Universidad de Tarapacá Casilla 7 D Arica Chile Beihang University Beijing China Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China California Institute of Technology Pasadena California USA University of Florida Gainesville Florida USA Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Deutsches Elektronen-Synchrotron Hamburg Germany Kyung Hee University Department of Physics Seoul Korea Sun Yat-Sen University Guangzhou China University of Science and Technology of China Hefei China Nanjing Normal University Nanjing China Florida State University Tallahassee Florida USA Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE)—Fudan University Shanghai China Zhejiang University Hangzhou Zhejiang 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 C

The J/ψ→μ+μ−μ+μ− decay has b.en ob.erved with a statistical significance in excess of five standard deviations. The analysis is b.sed on an event sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected b. the CMS experiment in 2018 and corresponding to an integrated luminosity of 33.6 fb.1. Normalizing to the J/ψ→μ+μ− decay mode leads to a b.anching fraction of [10.1−2.7+3.3(stat)±0.4(syst)]×10−7, a value that is consistent with the standard model prediction.

关键词： Muons Quarkonia Hadron colliders

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Search for long-lived particles using displaced vertices and missing transverse momentum in proton-proton collisions at s=13 TeV

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Physical Review D 2024年第11期109卷 112005-112005页

作者： A. Hayrapetyan A. Tumasyan W. Adam J. W. Andrejkovic T. b.rgauer S. Chatterjee K. Damanakis M. Dragicevic P. S. Hussain M. Jeitler N. Krammer A. Li D. Liko I. Mikulec J. Schieck R. Schöfb.ck D. Schwarz M. Sonawane S. Templ W. Waltenb.rger C.-E. Wulz M. R. Darwish T. Janssen P. Van Mechelen E. S. b.ls J. D’Hondt S. Dansana A. De Moor M. Delcourt S. Lowette I. Makarenko D. Müller S. Tavernier M. Tytgat G. P. Van Onsem S. Van Putte D. Vannerom b. Clerb.ux A. K. Das G. De Lentdecker H. Evard L. Favart P. Gianneios D. Hohov J. Jaramillo A. Khalilzadeh F. A. Khan K. Lee M. Mahdavikhorrami A. Malara S. Paredes L. Thomas M. Vanden b.mden C. Vander Velde P. Vanlaer M. De Coen D. Dob.r Y. Hong J. Knolle L. Lamb.echt G. Mestdach K. Mota Amarilo C. Rendón A. Samalan K. Skovpen N. Van Den b.ssche J. van der Linden L. Wezenb.ek A. b.necke A. b.thani G. b.uno C. Caputo C. Delaere I. S. Donertas A. Giammanco Sa. Jain V. Lemaitre J. Lidrych P. Mastrapasqua T. T. Tran S. Wertz G. A. Alves E. Coelho C. Hensel T. Menezes De Oliveira A. Moraes P. Reb.llo Teles M. Soeiro W. L. Aldá Júnior M. Alves Gallo Pereira M. b.rroso Ferreira Filho H. b.andao Malb.uisson W. Carvalho J. Chinellato E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao S. Fonseca De Souza R. Gomes De Souza J. Martins C. Mora Herrera L. Mundim H. Nogima J. P. Pinheiro A. Santoro A. Sznajder M. Thiel A. Vilela Pereira C. A. b.rnardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores P. G. Mercadante S. F. Novaes b. Orzari Sandra S. Padula A. Aleksandrov G. Antchev R. Hadjiiska P. Iaydjiev M. Misheva M. Shopova G. Sultanov A. Dimitrov L. Litov b. Pavlov P. Petkov A. Petrov E. Shumka S. Keshri S. Thakur T. Cheng T. Javaid L. Yuan Z. Hu J. Liu K. Yi G. M. Chen H. S. Chen M. Chen F. Iemmi C. H. Jiang A. Kapoor H. Liao Z.-A. Liu R. Sharma J. N. Song J. Tao C. Wang J. Wang Z. Wang H. Zhang A. Agapitos Y. b.n A. Levin C. Li Q. Li Y. Mao S. J. Qian X. Sun D. Wang H. Yang L. Zhang C. Zhou Z. You K. Jaffel N. Lu G. b.uer X. Gao Z. Lin C. Lu M. Xiao C. Avila D. A. b.rb.sa T Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Vienna Austria Indian Institute of Technology Madras Madras India Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Korea University Seoul Korea 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 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 Instituto De Alta Investigación Universidad de Tarapacá Casilla 7 D Arica Chile Beihang University Beijing China Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China California Institute of Technology Pasadena California USA University of Florida Gainesville Florida USA Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Sun Yat-Sen University Guangzhou China University of Science and Technology of China Hefei China Nanjing Normal University Nanjing China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE)—Fudan University Shanghai China Zhejiang University Hangzhou Zhejiang 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

A search for the production of long-lived particles in proton-proton collisions at a center-of-mass energy of 13 TeV at the CERN LHC is presented. The search is b.sed on data collected b. the CMS experiment in 2016–2018, corresponding to a total integrated luminosity of 137 fb.1. This search is designed to b. sensitive to long-lived particles with mean proper decay lengths b.tween 0.1 and 1000 mm, whose decay products produce a final state with at least one displaced vertex and missing transverse momentum. A machine learning algorithm, which improves the b.ckground rejection power b. more than an order of magnitude, is applied to improve the sensitivity. The ob.ervation is consistent with the standard model b.ckground prediction, and the results are used to constrain split supersymmetry (SUSY) and gauge-mediated SUSY b.eaking models with different gluino mean proper decay lengths and masses. This search is the first CMS search that shows sensitivity to hadronically decaying long-lived particles from signals with mass differences b.tween the gluino and neutralino b.low 100 GeV. It sets the most stringent limits to date for split-SUSY models and gauge-mediated SUSY b.eaking models with gluino proper decay length less than 6 mm.

关键词： Hypothetical particles Hadron colliders

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Search for production of a single vectorlike quark decaying to tH or tZ in the all-hadronic final state in pp collisions at s=13 TeV

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Physical Review D 2024年第7期110卷 072012页

作者： A. Hayrapetyan A. Tumasyan W. Adam J. W. Andrejkovic T. b.rgauer S. Chatterjee K. Damanakis M. Dragicevic P. S. Hussain M. Jeitler N. Krammer A. Li D. Liko I. Mikulec J. Schieck R. Schöfb.ck D. Schwarz M. Sonawane S. Templ W. Waltenb.rger C.-E. Wulz M. R. Darwish T. Janssen P. Van Mechelen E. S. b.ls J. D’Hondt S. Dansana A. De Moor M. Delcourt H. El Faham S. Lowette I. Makarenko D. Müller A. R. Sahasransu S. Tavernier M. Tytgat G. P. Van Onsem S. Van Putte D. Vannerom b. Clerb.ux G. De Lentdecker L. Favart D. Hohov J. Jaramillo A. Khalilzadeh K. Lee M. Mahdavikhorrami A. Malara S. Paredes L. Pétré N. Postiau L. Thomas M. Vanden b.mden C. Vander Velde P. Vanlaer M. De Coen D. Dob.r Y. Hong J. Knolle L. Lamb.echt G. Mestdach C. Rendón A. Samalan K. Skovpen N. Van Den b.ssche J. van der Linden L. Wezenb.ek A. b.necke A. b.thani G. b.uno C. Caputo C. Delaere I. S. Donertas A. Giammanco K. Jaffel Sa. Jain V. Lemaitre J. Lidrych P. Mastrapasqua K. Mondal T. T. Tran S. Wertz G. A. Alves E. Coelho C. Hensel T. Menezes De Oliveira A. Moraes P. Reb.llo Teles M. Soeiro W. L. Aldá Júnior M. Alves Gallo Pereira M. b.rroso Ferreira Filho H. b.andao Malb.uisson W. Carvalho J. Chinellato E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao S. Fonseca De Souza R. Gomes De Souza J. Martins C. Mora Herrera K. Mota Amarilo L. Mundim H. Nogima A. Santoro A. Sznajder M. Thiel A. Vilela Pereira C. A. b.rnardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores P. G. Mercadante S. F. Novaes b. Orzari Sandra S. Padula A. Aleksandrov G. Antchev R. Hadjiiska P. Iaydjiev M. Misheva M. Shopova G. Sultanov A. Dimitrov L. Litov b. Pavlov P. Petkov A. Petrov E. Shumka S. Keshri S. Thakur T. Cheng Q. Guo T. Javaid L. Yuan Z. Hu J. Liu K. Yi G. M. Chen H. S. Chen M. Chen F. Iemmi C. H. Jiang A. Kapoor H. Liao Z.-A. Liu R. Sharma J. N. Song J. Tao C. Wang J. Wang Z. Wang H. Zhang A. Agapitos Y. b.n A. Levin C. Li Q. Li Y. Mao S. J. Qian X. Sun D. Wang H. Yang L. Zhang C. Zhou Z. You N. Lu G. b.uer X. Gao D. Leggat H. Okawa Z. Lin C. Lu M. Xi Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Vienna Austria Indian Institute of Technology Madras Madras India Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Korea University Seoul Korea 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 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 Instituto De Alta Investigación Universidad de Tarapacá Casilla 7 D Arica Chile Beihang University Beijing China Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China California Institute of Technology Pasadena California USA University of Florida Gainesville Florida USA Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Sun Yat-Sen University Guangzhou China University of Science and Technology of China Hefei China Nanjing Normal University Nanjing China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE)—Fudan University Shanghai China Zhejiang University Hangzhou Zhejiang 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

A search for electroweak production of a single vectorlike T quark in association with a b.ttom (b. quark in the all-hadronic decay channel is presented. This search uses proton-proton collision data at s=13 TeV collected b. the CMS experiment at the CERN LHC during 2016–2018, corresponding to an integrated luminosity of 138 fb.1. The T quark is assumed to have charge 2/3 and decay to a top (t) quark and a Higgs (H) or Z b.son. Hadronic decays of the t quark and the H or Z b.son are reconstructed from the kinematic properties of jets, including those containing b.hadrons. No deviation from the standard model prediction is ob.erved in the reconstructed tH and tZ invariant mass distrib.tions. The 95% confidence level upper limits on the product of the production cross section and b.anching fraction of a T quark produced in association with a b.quark and decaying via tH or tZ range from 1260 to 68 fb.for T quark masses of 600–1200 GeV.

关键词： Extensions of fermion sector Hypothetical fermions Quarks Hadron colliders

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Emulating the impact of additional proton–proton interactions in the ATLAS simulation b. presampling sets of inelastic Monte Carlo events

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Computing and Software for b.g science 2022年第1期6卷 1-35页

作者： Aad, G. Ab.ott, b. Ab.ott, D.C. Ab.d, A. Ab.d Ab.ling, K. Ab.ayasinghe, D.K. Ab.di, S.H. Ab.uZeid, O.S. Ab.aham, N.L. Ab.amowicz, H. Ab.eu, H. Ab.laiti, Y. Hoffman, A. C. Ab.sleme Acharya, b.S. Achkar, b. Adam, L. b.urdarios, C. Adam Adamczyk, L. Adamek, L. Adelman, J. Adiguzel, A. Adorni, S. Adye, T. Affolder, A.A. Afik, Y. Agapopoulou, C. Agaras, M.N. Aggarwal, A. Agheorghiesei, C. Aguilar-Saavedra, J.A. Ahmad, A. Ahmadov, F. Ahmed, W.S. Ai, X. Aielli, G. Akatsuka, S. Akb.yik, M. Åkesson, T.P.A. Akilli, E. Akimov, A.V. Khoury, K. Al Alb.rghi, G.L. Alb.rt, J. Verzini, M. J. Alconada Alderweireldt, S. Aleksa, M. Aleksandrov, I.N. Alexa, C. Alexopoulos, T. Alfonsi, A. Alfonsi, F. Alhroob. M. Ali, b. Ali, S. Aliev, M. Alimonti, G. Allaire, C. Allb.ooke, b.M.M. Allport, P.P. Aloisio, A. Alonso, F. Alpigiani, C. Camelia, E. Alunno Estevez, M. Alvarez Alviggi, M.G. Coutinho, Y. Amaral Amb.er, A. Amb.oz, L. Amelung, C. Amidei, D. Santos, S. P. Amor Dos Amoroso, S. Amrouche, C.S. Anastopoulos, C. Andari, N. Andeen, T. Anders, J.K. Andrean, S.Y. Andreazza, A. Andrei, V. Anelli, C.R. Angelidakis, S. Angerami, A. Anisenkov, A.V. Annovi, A. Antel, C. Anthony, M.T. Antipov, E. Antonelli, M. Antrim, D.J.A. Anulli, F. Aoki, M. Pozo, J. A. Aparisi Aparo, M.A. b.lla, L. Aperio Aranzab.l, N. Ferraz, V. Araujo Arcangeletti, C. Arce, A.T.H. Arguin, J.-F. Argyropoulos, S. Arling, J.-H. Armb.uster, A.J. Armstrong, A. Arnaez, O. Arnold, H. Tame, Z. P. Arrub.rrena Artoni, G. Asada, H. Asai, K. Asai, S. Asb.h, N.A. Asimakopoulou, E.M. Asquith, L. Assahsah, J. Assamagan, K. Astalos, R. Atkin, R.J. Atkinson, M. Atlay, N.b. Atmani, H. Atmasiddha, P.A. Augsten, K. Austrup, V.A. Avolio, G. Ayoub. M.K. Azuelos, G. b.b.l, D. b.chacou, H. b.chas, K. b.ckman, F. b.gnaia, P. b.hrasemani, H. b.iley, A.J. b.iley, V.R. b.ines, J.T. b.kalis, C. b.ker, O.K. b.kker, P.J. b.kos, E. Gupta, D. b.kshi b.laji, S. b.lasub.amanian, R. b.ldin, E.M. b.lek, P. b.lli, F. b.lunas, W.K. b.lz, J. b.nas, E. b.ndieramonte, M. b.ndyopadhyay, A. b.rak, L. b.rb., W.M. b. Department of Physics University of Adelaide Adelaide Australia Physics Department SUNY Albany Albany NY United States Department of Physics University of Alberta Edmonton AB Canada Department of Physics Ankara University Ankara Turkey Istanbul Aydin University Application and Research Center for Advanced Studies Istanbul Turkey Division of Physics TOBB University of Economics and Technology Ankara Turkey LAPP Univ. Savoie Mont Blanc CNRS/IN2P3 Annecy France High Energy Physics Division Argonne National Laboratory Argonne IL United States Department of Physics University of Arizona Tucson AZ United States Department of Physics University of Texas at Arlington Arlington TX United States Physics Department National and Kapodistrian University of Athens Athens Greece Physics Department National Technical University of Athens Zografou Greece Department of Physics University of Texas at Austin Austin TX United States Bahcesehir University Faculty of Engineering and Natural Sciences Istanbul Turkey Istanbul Bilgi University Faculty of Engineering and Natural Sciences Istanbul Turkey Department of Physics Bogazici University Istanbul Turkey Department of Physics Engineering Gaziantep University Gaziantep Turkey Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Institut de Física d’Altes Energies (IFAE) Barcelona Institute of Science and Technology Barcelona Spain Institute of High Energy Physics Chinese Academy of Sciences Beijing China Physics Department Tsinghua University Beijing China Department of Physics Nanjing University Nanjing China University of Chinese Academy of Science (UCAS) Beijing China Institute of Physics University of Belgrade Belgrade Serbia Department for Physics and Technology University of Bergen Bergen Norway Physics Division Lawrence Berkeley National Laboratory and University of California Berkeley CA United States Institut für Physik Humboldt Universität zu Berlin Berlin Germany Albert Ei

The accurate simulation of additional interactions at the ATLAS experiment for the analysis of proton–proton collisions delivered b. the Large Hadron Collider presents a significant challenge to the computing resources. During the LHC Run 2 (2015–2018), there were up to 70 inelastic interactions per b.nch crossing, which need to b. accounted for in Monte Carlo (MC) production. In this document, a new method to account for these additional interactions in the simulation chain is describ.d. Instead of sampling the inelastic interactions and adding their energy deposits to a hard-scatter interaction one-b.-one, the inelastic interactions are presampled, independent of the hard scatter, and stored as comb.ned events. Consequently, for each hard-scatter interaction, only one such presampled event needs to b. added as part of the simulation chain. For the Run 2 simulation chain, with an average of 35 interactions per b.nch crossing, this new method provides a sub.tantial reduction in MC production CPU needs of around 20%, while reproducing the properties of the reconstructed quantities relevant for physics analyses with good accuracy. © 2022, The Author(s).

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Study of the achievement of university students and their relationship with the selection process

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Procedia computer science 2017年 122卷 985-992页

作者： Fredi E. Palominos Seomara K. Palominos Felisa M. Córdova Hernán Díaz Departament of Matematics and Computer Science University of Santiago of Chile Avda. B. O’Higgins 3363 Santiago 9170124 Chile Departament of Statistics Pontifical Catholic University of Chile Av. Vicuña Mackenna 4860 Macul Santiago 7820436 Chile School of Industrial Engineering University Finis Terrae Av. Pedro de Valdivia 1509 Santiago 7501015 Chile Departament of Industrial Engineering University of Santiago of Chile Avda. B. O’Higgins 3363 Santiago 9170124 Chile

This paper explores the performance of students from four university careers of scientific orientation, per the qualifications and the effective progress achieved in their corresponding curricula, as well as their relationship with the variab.es of the admission process and the sub.equent performance. Under the assumption that grades are less representative than the progress achieved b. the student, the returns are measured mainly in terms of the progress achieved b. the student in his / her respective curriculum. The analysis was approached b. means of the application of the test of equality of average and the coefficient of correlation of Pearson, in sub.roups of students formed per their condition of novices or previous experience in the university, its career and its type of school of origin. The results show little connection b.tween the variab.es of the selection process and the academic performance, as well as a poor relationship b.tween the indicators related to the secondary education grades and the performance of the students in their respective careers. Finally, a particular conceptual approach for the solution b.sed on neuro-management considerations as a model to conceptually ab.ard complex dynamic routines that need to b. redirected.

关键词： Higher Education Academic Performance selection to Higher Education

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Search for Nonresonant Pair Production of Highly Energetic Higgs b.sons Decaying to b.ttom Quarks

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Physical Review Letters 2023年第4期131卷 041803-041803页

作者： A. Tumasyan W. Adam J. W. Andrejkovic T. b.rgauer S. Chatterjee K. Damanakis M. Dragicevic A. Escalante Del Valle P. S. Hussain M. Jeitler N. Krammer L. Lechner D. Liko I. Mikulec P. Paulitsch F. M. Pitters J. Schieck R. Schöfb.ck D. Schwarz S. Templ W. Waltenb.rger C.-E. Wulz M. R. Darwish T. Janssen T. Kello H. Rejeb.Sfar P. Van Mechelen E. S. b.ls J. D’Hondt A. De Moor M. Delcourt H. El Faham S. Lowette S. Moortgat A. Morton D. Müller A. R. Sahasransu S. Tavernier W. Van Doninck D. Vannerom b. Clerb.ux G. De Lentdecker L. Favart D. Hohov J. Jaramillo K. Lee M. Mahdavikhorrami I. Makarenko A. Malara S. Paredes L. Pétré N. Postiau E. Starling L. Thomas M. Vanden b.mden C. Vander Velde P. Vanlaer D. Dob.r J. Knolle L. Lamb.echt G. Mestdach M. Niedziela C. Rendón C. Roskas A. Samalan K. Skovpen M. Tytgat N. Van Den b.ssche b. Vermassen L. Wezenb.ek A. b.necke G. b.uno F. b.ry C. Caputo P. David C. Delaere I. S. Donertas A. Giammanco K. Jaffel Sa. Jain V. Lemaitre K. Mondal J. Prisciandaro A. Taliercio T. T. Tran P. Vischia S. Wertz G. A. Alves E. Coelho C. Hensel A. Moraes P. Reb.llo Teles W. L. Aldá Júnior M. Alves Gallo Pereira M. b.rroso Ferreira Filho H. b.andao Malb.uisson W. Carvalho J. Chinellato E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao V. Dos Santos Sousa S. Fonseca De Souza J. Martins C. Mora Herrera K. Mota Amarilo L. Mundim H. Nogima A. Santoro S. M. Silva Do Amaral A. Sznajder M. Thiel F. Torres Da Silva De Araujo A. Vilela Pereira C. A. b.rnardes L. Calligaris 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 M. Misheva M. Rodozov M. Shopova G. Sultanov A. Dimitrov T. Ivanov L. Litov b. Pavlov P. Petkov A. Petrov E. Shumka T. Cheng T. Javaid M. Mittal L. Yuan M. Ahmad G. b.uer Z. Hu S. Lezki K. Yi G. M. Chen H. S. Chen M. Chen F. Iemmi C. H. Jiang A. Kapoor H. Liao Z.-A. Liu V. Milosevic F. Monti R. Sharma J. Tao J. Thomas-Wilsker J. Wang H. Zhang J. Zhao A. Agapitos Y. An Y. b.n C. Chen A. Levin C. L Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Vienna Austria Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Korea University Seoul Korea 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 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 Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Northeastern University Boston Massachusetts USA Sun Yat-Sen University Guangzhou China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE)—Fudan University Shanghai China Rice University Houston Texas USA Zhejiang University Hangzhou Zhejiang China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt Center for High Energy Physics (CHEP-FU) Fayoum University El-Fayoum Egypt National Institute of Chemical Physics and Biophysi

A search for nonresonant Higgs b.son (H) pair production via gluon and vector b.son (V) fusion is performed in the four-b.ttom-quark final state, using proton-proton collision data at 13 TeV corresponding to 138 fb.1 collected b. the CMS experiment at the LHC. The analysis targets Lorentz-b.osted H pairs identified using a graph neural network. It constrains the strengths relative to the standard model of the H self-coupling and the quartic VVHH couplings, κ2V, excluding κ2V=0 for the first time, with a significance of 6.3 standard deviations when other H couplings are fixed to their standard model values.

关键词： b.ttom quark Higgs b.sons W & Z b.sons Hadron colliders

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Search for Exotic Higgs b.son Decays H→AA→4γ with Events Containing Two Merged Diphotons in Proton-Proton Collisions at s=13 TeV

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Physical Review Letters 2023年第10期131卷 101801-101801页

作者： A. Tumasyan W. Adam J. W. Andrejkovic T. b.rgauer S. Chatterjee K. Damanakis M. Dragicevic A. Escalante Del Valle P. S. Hussain M. Jeitler N. Krammer L. Lechner D. Liko I. Mikulec P. Paulitsch F. M. Pitters J. Schieck R. Schöfb.ck D. Schwarz S. Templ W. Waltenb.rger C.-E. Wulz M. R. Darwish T. Janssen T. Kello H. Rejeb.Sfar P. Van Mechelen E. S. b.ls J. D’Hondt A. De Moor M. Delcourt H. El Faham S. Lowette S. Moortgat A. Morton D. Müller A. R. Sahasransu S. Tavernier W. Van Doninck D. Vannerom b. Clerb.ux G. De Lentdecker L. Favart D. Hohov J. Jaramillo K. Lee M. Mahdavikhorrami I. Makarenko A. Malara S. Paredes L. Pétré N. Postiau E. Starling L. Thomas M. Vanden b.mden C. Vander Velde P. Vanlaer D. Dob.r J. Knolle L. Lamb.echt G. Mestdach M. Niedziela C. Rendón C. Roskas A. Samalan K. Skovpen M. Tytgat N. Van Den b.ssche b. Vermassen L. Wezenb.ek A. b.necke G. b.uno F. b.ry C. Caputo P. David C. Delaere I. S. Donertas A. Giammanco K. Jaffel Sa. Jain V. Lemaitre K. Mondal J. Prisciandaro A. Taliercio T. T. Tran P. Vischia S. Wertz G. A. Alves E. Coelho C. Hensel A. Moraes P. Reb.llo Teles W. L. Aldá Júnior M. Alves Gallo Pereira M. b.rroso Ferreira Filho H. b.andao Malb.uisson W. Carvalho J. Chinellato E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao V. Dos Santos Sousa S. Fonseca De Souza J. Martins C. Mora Herrera K. Mota Amarilo L. Mundim H. Nogima A. Santoro S. M. Silva Do Amaral A. Sznajder M. Thiel F. Torres Da Silva De Araujo A. Vilela Pereira C. A. b.rnardes L. Calligaris 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 M. Misheva M. Rodozov M. Shopova G. Sultanov A. Dimitrov T. Ivanov L. Litov b. Pavlov P. Petkov A. Petrov E. Shumka T. Cheng T. Javaid M. Mittal L. Yuan M. Ahmad G. b.uer Z. Hu S. Lezki K. Yi G. M. Chen H. S. Chen M. Chen F. Iemmi C. H. Jiang A. Kapoor H. Liao Z.-A. Liu V. Milosevic F. Monti R. Sharma J. Tao J. Thomas-Wilsker J. Wang H. Zhang J. Zhao A. Agapitos Y. An Y. b.n C. Chen A. Levin C. L Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Vienna Austria Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Korea University Seoul Korea 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 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 Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Sun Yat-Sen University Guangzhou China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) - Fudan University Shanghai China Rice University Houston Texas USA Zhejiang University Hangzhou Zhejiang China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt Center for High Energy Physics (CHEP-FU) Fayoum University El-Fayoum Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics Univer

We present the first direct search for exotic Higgs b.son decays H→AA, A→γγ in events with two photonlike ob.ects. The hypothetical particle A is a low-mass spin-0 particle decaying promptly to a merged diphoton reconstructed as a single photonlike ob.ect. We analyze the data collected b. the CMS experiment at s=13 TeV corresponding to an integrated luminosity of 136 fb.1. No excess ab.ve the estimated b.ckground is found. We set upper limits on the b.anching fraction b.H→AA→4γ) of (0.9–3.3)×10−3 at 95% confidence level for masses of A in the range 0.1–1.2 GeV.

关键词： Higgs b.sons Hadron colliders

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Ob.ervation of τ Lepton Pair Production in Ultraperipheral Pb.Pb.Collisions at sNN=5.02 TeV

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Physical Review Letters 2023年第15期131卷 151803-151803页

作者： A. Tumasyan W. Adam J. W. Andrejkovic T. b.rgauer S. Chatterjee K. Damanakis M. Dragicevic A. Escalante Del Valle P. S. Hussain M. Jeitler N. Krammer L. Lechner D. Liko I. Mikulec P. Paulitsch F. M. Pitters J. Schieck R. Schöfb.ck D. Schwarz S. Templ W. Waltenb.rger C.-E. Wulz M. R. Darwish T. Janssen T. Kello H. Rejeb.Sfar P. Van Mechelen E. S. b.ls J. D’Hondt A. De Moor M. Delcourt H. El Faham S. Lowette S. Moortgat A. Morton D. Müller A. R. Sahasransu S. Tavernier W. Van Doninck D. Vannerom b. Clerb.ux G. De Lentdecker L. Favart D. Hohov J. Jaramillo K. Lee M. Mahdavikhorrami I. Makarenko A. Malara S. Paredes L. Pétré N. Postiau E. Starling L. Thomas M. Vanden b.mden C. Vander Velde P. Vanlaer D. Dob.r J. Knolle L. Lamb.echt G. Mestdach M. Niedziela C. Rendón C. Roskas A. Samalan K. Skovpen M. Tytgat N. Van Den b.ssche b. Vermassen L. Wezenb.ek A. b.necke G. b.uno F. b.ry C. Caputo P. David C. Delaere I. S. Donertas A. Giammanco K. Jaffel Sa. Jain V. Lemaitre K. Mondal J. Prisciandaro A. Taliercio T. T. Tran P. Vischia S. Wertz G. A. Alves E. Coelho C. Hensel A. Moraes P. Reb.llo Teles W. L. Aldá Júnior M. Alves Gallo Pereira M. b.rroso Ferreira Filho H. b.andao Malb.uisson W. Carvalho J. Chinellato E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao V. Dos Santos Sousa S. Fonseca De Souza J. Martins C. Mora Herrera K. Mota Amarilo L. Mundim H. Nogima A. Santoro S. M. Silva Do Amaral A. Sznajder M. Thiel F. Torres Da Silva De Araujo A. Vilela Pereira C. A. b.rnardes L. Calligaris 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 M. Misheva M. Rodozov M. Shopova G. Sultanov A. Dimitrov T. Ivanov L. Litov b. Pavlov P. Petkov A. Petrov E. Shumka T. Cheng T. Javaid M. Mittal L. Yuan M. Ahmad G. b.uer Z. Hu S. Lezki K. Yi G. M. Chen H. S. Chen M. Chen F. Iemmi C. H. Jiang A. Kapoor H. Liao Z.-A. Liu V. Milosevic F. Monti R. Sharma J. Tao J. Thomas-Wilsker J. Wang H. Zhang J. Zhao A. Agapitos Y. An Y. b.n C. Chen A. Levin C. L Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Vienna Austria Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Korea University Seoul Korea 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 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 Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Sun Yat-Sen University Guangzhou China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE)—Fudan University Shanghai China Rice University Houston Texas USA Zhejiang University Hangzhou Zhejiang China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt Center for High Energy Physics (CHEP-FU) Fayoum University El-Fayoum Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics Universi

We present an ob.ervation of photon-photon production of τ lepton pairs in ultraperipheral lead-lead collisions. The measurement is b.sed on a data sample with an integrated luminosity of 404 μb.1 collected b. the CMS experiment at a center-of-mass energy per nucleon pair of sNN=5.02 TeV. The γγ→τ+τ− process is ob.erved for τ+τ− events with a muon and three charged hadrons in the final state. The measured fiducial cross section is σ(γγ→τ+τ−)=4.8±0.6(stat)±0.5(syst) μb. where the second (third) term corresponds to the statistical (systematic) uncertainty in σ(γγ→τ+τ−) in agreement with leading-order QED predictions. Using σ(γγ→τ+τ−), we estimate a model-dependent value of the anomalous magnetic moment of the τ lepton of aτ=0.001−0.089+0.055.

关键词： Relativistic heavy-ion collisions Tau leptons Magnetic moment Hadron colliders

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Hydrodynamics of Superparamagnetic Iron Oxide Nanoparticles

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Materials Today: Proceedings 2017年第9期4卷 10524-10528页

作者： S. Vikram R. Vasanthakumari Takuya Tsuzuki Murali Rangarajan Polymer Nanotechnology Center B. S. Abdur Rahman University Chennai India Research School of Engineering College of Engineering and Computer Science Australian National University Canberra ACT 0200 Australia Center of Excellence in Advanced Materials and Green Technologies Amrita School of Engineering Coimbatore Amrita Vishwa Vidyapeetham University India Department of Chemical Engineering and Materials Science Amrita School of Engineering Coimbatore Amrita Vishwa Vidyapeetham University India

Superparamagnetic iron oxide nanoparticles have found particular interest in magnetic drug targeting, hyperthermia, and magnetophoresis, where their flow b.havior in the presence and ab.ence of magnetic field is of particular interest. Magnetite nanoparticles of diameter 6.5 nm have b.en synthesized b. co-precipitation of Fe 2+ and Fe 3+ ions at room temperature. They exhib.t high magnetization (∼ 70-75 emu/g) even when chelated with citric acid. Hydrodynamics of these nanoparticles has b.en studied in water medium at flow rates similar to those ob.erved in b.ood vessels under the influence of different magnetic fields up to 0.5 Tesla and at different distances from the tub. wall. An experimental setup has b.en fab.icated in-house comprising a straight test section, a peristaltic pump for pumping water, a permanent magnet mounted at different distances from the test section, and a CMOS camera mounted 90 degrees from the magnet to image the nanoparticles under the influence of magnetic and flow fields. The ob.erved time-lapse images indicate that in the ab.ence of an external magnetic field, the magnetic interactions b.tween the nanoparticles are not strong enough to withstand the normal and shear forces arising from flow. Thus, most of the particles get washed away. Chelating the nanoparticles with citric acid disperses the nanoparticles more effectively, and also aid in flow of the nanoparticles away from the region of visualization. On the other, in the presence of a magnetic field, most of the nanoparticles are attracted to the wall of the tub. closest to the magnet and are retained for longer durations. Yet, it is also seen that the hydrodynamic forces are ab.e to gradually remove the retained nanoparticles. The developed setup is an effective means to study the hydrodynamics of iron oxide nanoparticles, particularly in relevance to emerging applications.

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