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

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. bergauer s. Chatterjee K. Damanakis M. Dragicevic P. s. Hussain M. Jeitler N. Krammer A. Li D. Liko I. Mikulec J. schieck R. schöfbeck D. schwarz M. sonawane s. Templ W. Waltenberger C.-e. Wulz M. R. Darwish T. Janssen P. Van Mechelen N. b.e.gelmans 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. Clerbaux 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 bemden C. Vander Velde P. Vanlaer M. De Coen D. Dobur G. Gokbulut Y. Hong J. Knolle L. Lamb.e.ht D. Marckx G. Mestdach K. Mota Amarilo A. samalan K. skovpen N. Van Den bossche J. van der Linden L. Wezenb.e. A. benecke A. bethani G. bruno 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. Rebello Teles M. soeiro A. Vilela Pereira W. L. Aldá Júnior M. barroso Ferreira Filho H. brandao Malbouisson 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. bernardes 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. ban 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.e. ob.e.ved with a statistical significance in excess of five standard deviations. The analysis is based on an event sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by 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 branching 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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Ob.e.vation of the Rare Decay of the η Meson to Four Muons

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Physical Review Letters 2023年第9期131卷 091903-091903页

作者： A. Hayrapetyan A. Tumasyan W. Adam J. W. Andrejkovic T. bergauer s. Chatterjee K. Damanakis M. Dragicevic A. escalante Del Valle P. s. Hussain M. Jeitler N. Krammer D. Liko I. Mikulec J. schieck R. schöfbeck D. schwarz M. sonawane s. Templ W. Waltenberger C.-e. Wulz M. R. Darwish T. Janssen P. Van Mechelen e. s. bols J. D’Hondt s. Dansana A. De Moor M. Delcourt H. el Faham s. Lowette I. Makarenko A. Morton D. Müller A. R. sahasransu s. Tavernier M. Tytgat s. Van Putte D. Vannerom b. Clerbaux 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 bemden C. Vander Velde P. Vanlaer M. De Coen D. Dobur J. Knolle L. Lamb.e.ht G. Mestdach C. Rendón A. samalan K. skovpen N. Van Den bossche L. Wezenb.e. A. benecke G. bruno 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. Rebello Teles M. soeiro W. L. Aldá Júnior M. Alves Gallo Pereira M. barroso Ferreira Filho H. brandao Malbouisson 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 s. M. silva Do Amaral A. sznajder M. Thiel A. Vilela Pereira C. A. bernardes 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 T. Ivanov L. Litov b. Pavlov P. Petkov A. Petrov e. shumka s. Keshri s. Thakur T. Cheng Q. Guo T. Javaid M. Mittal L. Yuan G. bauer Z. Hu K. Yi G. M. Chen H. s. Chen M. Chen F. Iemmi C. H. Jiang A. Kapoor H. Liao Z.-A. Liu F. Monti R. sharma J. N. song J. Tao J. Wang H. Zhang A. Agapitos Y. ban A. Levin C. Li Q. Li X. Lyu Y. Mao s. J. Qian X. sun D. Wang H. Yang C. Zhou Z. You N. Lu D. Leggat H. Okawa Y. Zhang Z. Lin C. Lu M. Xiao C. Avila D. A Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Vienna Austria Indian Institute of Technology Madras Madras India Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussels 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 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 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 Phy

A search for the rare η→μ+μ−μ+μ− doub.e.Dalitz decay is performed using a sample of proton-proton collisions, collected by the CMs experiment at the CeRN LHC with high-rate muon triggers during 2017 and 2018 and corresponding to an integrated luminosity of 101 fb−1. A signal having a statistical significance well in excess of 5 standard deviations is ob.e.ved. Using the η→μ+μ− decay as normalization, the branching fraction b(η→μ+μ−μ+μ−)=[5.0±0.8(stat)±0.7(syst)±0.7(b2μ)]×10−9 is measured, where the last term is the uncertainty in the normalization channel branching fraction. This work achieves an improved precision of over 5 orders of magnitude compared to previous results, leading to the first measurement of this branching fraction, which is found to agree with theoretical predictions.

关键词： Mesons Hadron colliders Particle decays

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search for high-mass exclusive diphoton production with tagged protons in proton-proton collisions at s=13 TeV

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Physical Review D 2024年第1期110卷 012010-012010页

作者： A. Tumasyan W. Adam J. W. Andrejkovic T. bergauer 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. schöfbeck D. schwarz M. sonawane s. Templ W. Waltenberger C.-e. Wulz M. R. Darwish T. Janssen T. Kello H. Rejeb sfar P. Van Mechelen e. s. bols 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. Clerbaux G. De Lentdecker L. Favart D. Hohov J. Jaramillo K. Lee M. Mahdavikhorrami I. Makarenko A. Malara s. Paredes L. Pétré N. Postiau L. Thomas M. Vanden bemden C. Vander Velde P. Vanlaer D. Dobur J. Knolle L. Lamb.e.ht G. Mestdach M. Niedziela C. Rendón C. Roskas A. samalan K. skovpen M. Tytgat N. Van Den bossche b. Vermassen L. Wezenb.e. A. benecke G. bruno F. bury C. Caputo P. David C. Delaere I. s. Donertas A. Giammanco K. Jaffel sa. Jain V. Lemaitre K. Mondal A. Taliercio T. T. Tran P. Vischia s. Wertz G. A. Alves e. Coelho C. Hensel A. Moraes P. Rebello Teles W. L. Aldá Júnior M. Alves Gallo Pereira M. barroso Ferreira Filho H. brandao Malbouisson 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. bernardes L. Calligaris T. R. Fernandez Perez Tomei e. M. Gregores P. G. Mercadante s. F. Novaes sandra s. Padula A. Aleksandrov 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 s. Thakur T. Cheng T. Javaid M. Mittal L. Yuan M. Ahmad G. bauer Z. Hu s. Lezki K. Yi G. M. Chen H. s. Chen M. Chen F. Iemmi C. H. Jiang A. Kapoor H. Kou 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. ban C. Chen A. Levin C. Li Q. Li X. 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 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 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 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-

A search is presented for high-mass exclusive diphoton production via photon-photon fusion in proton-proton collisions at s=13 TeV in events where both protons survive the interaction. The analysis utilizes data corresponding to an integrated luminosity of 103 fb−1 collected in 2016–2018 with the central CMs detector and the CMs and TOTeM precision proton spectrometer (PPs). events that have two photons with high transverse momenta (pTγ>100 GeV), back-to-back in azimuth, and with a large diphoton invariant mass (mγγ>350 GeV) are selected. To remove the dominant inclusive diphoton backgrounds, the kinematic properties of the protons detected in PPs are required to match those of the central diphoton system. Only events having opposite-side forward protons detected with a fractional momentum loss between 0.035 and 0.15 (0.18) for the detectors on the negative (positive) side of CMs are considered. One exclusive diphoton candidate is ob.e.ved for an expected background of 1.1 events. Limits at 95% confidence level are derived for the four-photon anomalous coupling parameters |ζ1|<0.073 TeV−4 and |ζ2|<0.15 TeV−4, using an effective field theory. Additionally, upper limits are placed on the production of axionlike particles with coupling strength to photons f−1 that varies from 0.03 TeV−1 to 1 TeV−1 over the mass range from 500 to 2000 GeV.

关键词： Axion-like particles Photons Hadron colliders

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Measurement of simplified template cross sections of the Higgs boson produced in association with W or Z bosons in the H→bb¯ decay channel in proton-proton collisions at s=13 TeV

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Physical Review D 2024年第9期109卷 092011-092011页

作者： A. Tumasyan W. Adam J. W. Andrejkovic T. bergauer 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 J. schieck R. schöfbeck D. schwarz M. sonawane s. Templ W. Waltenberger C.-e. Wulz M. R. Darwish T. Janssen T. Kello H. Rejeb sfar P. Van Mechelen e. s. bols J. D’Hondt A. De Moor M. Delcourt H. el Faham s. Lowette A. Morton D. Müller A. R. sahasransu s. Tavernier W. Van Doninck s. Van Putte D. Vannerom b. Clerbaux G. De Lentdecker L. Favart D. Hohov J. Jaramillo K. Lee M. Mahdavikhorrami I. Makarenko A. Malara s. Paredes L. Pétré N. Postiau L. Thomas M. Vanden bemden C. Vander Velde P. Vanlaer D. Dobur J. Knolle L. Lamb.e.ht G. Mestdach C. Rendón A. samalan K. skovpen M. Tytgat N. Van Den bossche b. Vermassen L. Wezenb.e. A. benecke G. bruno F. bury C. Caputo P. David C. Delaere I. s. Donertas A. Giammanco K. Jaffel sa. Jain V. Lemaitre K. Mondal A. Taliercio T. T. Tran P. Vischia s. Wertz G. A. Alves e. Coelho C. Hensel A. Moraes P. Rebello Teles W. L. Aldá Júnior M. Alves Gallo Pereira M. barroso Ferreira Filho H. brandao Malbouisson 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 A. Vilela Pereira C. A. bernardes 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 s. Thakur T. Cheng T. Javaid M. Mittal L. Yuan M. Ahmad G. bauer 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. ban A. Levin C. Li Q. Li X. Lyu Y. Mao s. J. Qian X. sun D. Wang J. Xiao H. Yang M. Lu Z. You N. 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 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 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 Physic

Differential cross sections are measured for the standard model Higgs boson produced in association with vector bosons (W, Z) and decaying to a pair of b quarks. Measurements are performed within the framework of the simplified template cross sections. The analysis relies on the leptonic decays of the W and Z bosons, resulting in final states with 0, 1, or 2 electrons or muons. The Higgs boson candidates are either reconstructed from pairs of resolved b-tagged jets, or from single large-radius jets containing the particles arising from two b quarks. Proton-proton collision data at s=13 TeV, collected by the CMs experiment in 2016–2018 and corresponding to a total integrated luminosity of 138 fb−1, are analyzed. The inclusive signal strength, defined as the product of the ob.e.ved production cross section and branching fraction relative to the standard model expectation, combining all analysis categories, is found to be μ=1.15−0.20+0.22. This corresponds to an ob.e.ved (expected) significance of 6.3 (5.6) standard deviations.

关键词： Higgs bosons Hadron colliders

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evidence for the Higgs boson Decay to a Z boson and a Photon at the LHC

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Physical Review Letters 2024年第2期132卷 021803-021803页

作者： G. Aad b. Abbott K. Abeling N. J. Abicht s. H. Abidi A. Aboulhorma H. Abramowicz H. Ab.e. Y. Abulaiti b. s. Acharya C. Adam bourdarios L. Adamczyk L. Adamek s. V. Addepalli M. J. Addison J. Adelman A. Adiguzel T. Adye A. A. Affolder Y. Afik M. N. Agaras J. Agarwala A. Aggarwal C. Agheorghiesei A. Ahmad F. Ahmadov W. s. Ahmed s. Ahuja X. Ai G. Aielli A. Aikot M. Ait Tamlihat b. Aitbenchikh I. Aizenberg M. Akbiyik T. P. A. Åkesson A. V. Akimov D. Akiyama N. N. Akolkar K. Al Khoury G. L. Alberghi J. Albert P. Albicocco G. L. Albouy s. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa T. Alexopoulos F. Alfonsi M. Algren M. Alhroob b. Ali H. M. J. Ali s. Ali s. W. Alibocus M. Aliev G. Alimonti W. Alkakhi C. Allaire b. M. M. Allbrooke J. F. Allen C. A. Allendes Flores P. P. Allport A. Aloisio F. Alonso C. Alpigiani M. Alvarez estevez A. Alvarez Fernandez M. Alves Cardoso M. G. Alviggi M. Aly Y. Amaral Coutinho A. Amb.e. C. Amelung M. Amerl C. G. Ames D. Amidei s. P. Amor Dos santos K. R. Amos V. Ananiev C. Anastopoulos T. Andeen J. K. Anders s. Y. Andrean A. Andreazza s. Angelidakis A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony e. Antipov M. Antonelli F. Anulli M. Aoki T. Aoki J. A. Aparisi Pozo M. A. Aparo L. Aperio bella C. Appelt A. Apyan N. Aranzabal C. Arcangeletti A. T. H. Arce e. Arena J-F. Arguin s. Argyropoulos J.-H. Arling O. Arnaez H. Arnold G. Artoni H. Asada K. Asai s. Asai N. A. Asbah J. Assahsah K. Assamagan R. Astalos s. Atashi R. J. Atkin M. Atkinson H. Atmani P. A. Atmasiddha K. Augsten s. Auricchio A. D. Auriol V. A. Austrup G. Avolio K. Axiotis G. Azuelos D. babal H. bachacou K. bachas A. bachiu F. backman A. badea P. bagnaia M. bahmani A. J. bailey V. R. bailey J. T. baines L. baines C. bakalis O. K. baker e. bakos D. bakshi Gupta V. balakrishnan R. balasubramanian e. M. baldin P. balek e. ballabene F. balli L. M. baltes W. K. balunas J. balz e. banas M. bandieramonte A. bandyopadhyay s. bansal L. barak M. barakat e. L. barberio D. barberis M. barbero M. Z. barel K. N. barends T. ba Benemerita Universidad Autonoma de Puebla Puebla Mexico ETH Zurich—Institute for Particle Physics and Astrophysics (IPA) Zurich Switzerland Institute of Nuclear Research ATOMKI Debrecen Hungary National and Kapodistrian University of Athens Athens Greece Escuela Politecnica Nacional Quito Ecuador Faculté des sciences Université Mohammed V Rabat Morocco University of Florida Gainesville Florida USA Fermi National Accelerator Laboratory Batavia Illinois USA University of Ruhuna Department of Physics Matara Sri Lanka INFN Sezione di Bologna Bologna Italy Università di Bologna Bologna Italy Vrije Universiteit Brussel Brussel Belgium AGH University of Krakow Faculty of Physics and Applied Computer Science Krakow Poland The University of Iowa Iowa City Iowa USA Institute Rudjer Boskovic Zagreb Croatia Universidad Iberoamericana Mexico City Mexico Instituto de Física de Cantabria (IFCA) CSIC-Universidad de Cantabria Santander Spain Department of Physics Istanbul University Istanbul Türkiye Imperial College London United Kingdom Baylor University Waco Texas USA Lappeenranta-Lahti University of Technology Lappeenranta Finland Instituto De Alta Investigación Universidad de Tarapacá Casilla 7 D Arica Chile INFN Sezione di Genova Genova Italy Università di Genova Genova Italy Centro de Investigacion y de Estudios Avanzados del IPN Mexico City Mexico Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania National Centre for Physics Quaid-I-Azam University Islamabad Pakistan Laboratoire Leprince-Ringuet CNRS/IN2P3 Ecole Polytechnique Institut Polytechnique de Paris Palaiseau France University of Canterbury Christchurch New Zealand Riga Technical University Riga Latvia Department of Modern Physics and State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei China INFN Sezione di Padova Padova Italy Università di Padova Padova Italy University of Mississippi Oxford Mississi

The first evidence for the Higgs boson decay to a Z boson and a photon is presented, with a statistical significance of 3.4 standard deviations. The result is derived from a combined analysis of the searches performed by the ATLAs and CMs Collaborations with proton-proton collision datasets collected at the CeRN Large Hadron Collider (LHC) from 2015 to 2018. These correspond to integrated luminosities of around 140 fb−1 for each experiment, at a center-of-mass energy of 13 TeV. The measured signal yield is 2.2±0.7 times the standard model prediction, and agrees with the theoretical expectation within 1.9 standard deviations.

关键词： Rare decays Higgs bosons W & Z bosons Hadron colliders

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search for a scalar or pseudoscalar dilepton resonance produced in association with a massive vector boson or top quark-antiquark pair in multilepton events at s=13 TeV

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Physical Review D 2024年第1期110卷 012013-012013页

作者： A. Tumasyan W. Adam J. W. Andrejkovic T. bergauer 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 J. schieck R. schöfbeck D. schwarz M. sonawane s. Templ W. Waltenberger C.-e. Wulz M. R. Darwish T. Janssen T. Kello P. Van Mechelen e. s. bols J. D’Hondt A. De Moor M. Delcourt H. el Faham s. Lowette A. Morton D. Müller A. R. sahasransu s. Tavernier W. Van Doninck s. Van Putte D. Vannerom b. Clerbaux s. Dansana G. De Lentdecker L. Favart D. Hohov J. Jaramillo K. Lee M. Mahdavikhorrami I. Makarenko A. Malara s. Paredes L. Pétré N. Postiau L. Thomas M. Vanden bemden C. Vander Velde P. Vanlaer D. Dobur J. Knolle L. Lamb.e.ht G. Mestdach C. Rendón A. samalan K. skovpen M. Tytgat N. Van Den bossche b. Vermassen L. Wezenb.e. A. benecke G. bruno F. bury C. Caputo P. David C. Delaere I. s. Donertas A. Giammanco K. Jaffel sa. Jain V. Lemaitre K. Mondal A. Taliercio T. T. Tran P. Vischia s. Wertz G. A. Alves e. Coelho C. Hensel A. Moraes P. Rebello Teles W. L. Aldá Júnior M. Alves Gallo Pereira M. barroso Ferreira Filho H. brandao Malbouisson 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 A. Vilela Pereira C. A. bernardes 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 s. Keshri s. Thakur T. Cheng Q. Guo T. Javaid M. Mittal L. Yuan G. bauer 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. ban A. Carvalho Antunes De Oliveira A. Levin C. Li Q. Li X. Lyu Y. Mao s. J. Qian X. sun D. Wang 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 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 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 Physic

A search for beyond the standard model spin-0 bosons, ϕ, that decay into pairs of electrons, muons, or tau leptons is presented. The search targets the associated production of such bosons with a W or Z gauge boson, or a top quark-antiquark pair, and uses events with three or four charged leptons, including hadronically decaying tau leptons. The proton-proton collision data set used in the analysis was collected at the LHC from 2016 to 2018 at a center-of-mass energy of 13 TeV, and corresponds to an integrated luminosity of 138 fb−1. The ob.e.vations are consistent with the predictions from standard model processes. Upper limits are placed on the product of cross sections and branching fractions of such new particles over the mass range of 15 to 350 GeV with scalar, pseudoscalar, or Higgs-boson-like couplings, as well as on the product of coupling parameters and branching fractions. several model-dependent exclusion limits are also presented. For a Higgs-boson-like ϕ model, limits are set on the mixing angle of the Higgs boson with the ϕ boson. For the associated production of a ϕ boson with a top quark-antiquark pair, limits are set on the coupling to top quarks. Finally, limits are set for the first time on a fermiophilic dilaton-like model with scalar couplings and a fermiophilic axion-like model with pseudoscalar couplings.

关键词： extensions of scalar sector W & Z bosons Hadron colliders

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Author Correction: bigNeuron: a resource to benchmark and predict performance of algorithms for automated tracing of neurons in light microscopy datasets

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Nature methods 2024年第10期21卷 1959页

作者： Linus Manubens-Gil Zhi Zhou Hanbo Chen Arvind Ramanathan Xiaoxiao Liu Yufeng Liu Alessandro bria Todd Gillette Zongcai Ruan Jian Yang Miroslav Radojević Ting Zhao Li Cheng Lei Qu siqi Liu Kristofer e bouchard Lin Gu Weidong Cai shuiwang Ji badrinath Roysam Ching-Wei Wang Hongchuan Yu Amos sironi Daniel Maxim Iascone Jie Zhou erhan bas eduardo Conde-sousa Paulo Aguiar Xiang Li Yujie Li sumit Nanda Yuan Wang Leila Muresan Pascal Fua bing Ye Hai-Yan He Jochen F staiger Manuel Peter Daniel N Cox Michel simonneau Marcel Oberlaender Gregory Jefferis Kei Ito Paloma Gonzalez-bellido Jinhyun Kim edwin Rubel Hollis T Cline Hongkui Zeng Aljoscha Nern Ann-shyn Chiang Jianhua Yao Jane Roskams Rick Livesey Janine stevens Tianming Liu Chinh Dang Yike Guo Ning Zhong Georgia Tourassi sean Hill Michael Hawrylycz Christof Koch erik Meijering Giorgio A Ascoli Hanchuan Peng Institute for Brain and Intelligence Southeast University Nanjing China. Microsoft Corporation Redmond WA USA. Tencent AI Lab Bellevue WA USA. Computing Environment and Life Sciences Directorate Argonne National Laboratory Lemont IL USA. Kaya Medical Seattle WA USA. University of Cassino and Southern Lazio Cassino Italy. Center for Neural Informatics Structures and Plasticity Krasnow Institute for Advanced Study George Mason University Fairfax VA USA. Faculty of Information Technology Beijing University of Technology Beijing China. Beijing International Collaboration Base on Brain Informatics and Wisdom Services Beijing China. Nuctech Netherlands Rotterdam the Netherlands. Janelia Research Campus Howard Hughes Medical Institute Ashburn VA USA. Department of Electrical and Computer Engineering University of Alberta Edmonton Alberta Canada. Ministry of Education Key Laboratory of Intelligent Computation and Signal Processing Anhui University Hefei China. Paige AI New York NY USA. Scientific Data Division and Biological Systems and Engineering Division Lawrence Berkeley National Lab Berkeley CA USA. Helen Wills Neuroscience Institute and Redwood Center for Theoretical Neuroscience UC Berkeley Berkeley CA USA. RIKEN AIP Tokyo Japan. Research Center for Advanced Science and Technology (RCAST) The University of Tokyo Tokyo Japan. School of Computer Science University of Sydney Sydney New South Wales Australia. Texas A&M University College Station TX USA. Cullen College of Engineering University of Houston Houston TX USA. Graduate Institute of Biomedical Engineering National Taiwan University of Science and Technology Taipei Taiwan. National Centre for Computer Animation Bournemouth University Poole UK. PROPHESEE Paris France. Department of Neuroscience Columbia University New York NY USA. Mortimer B. Zuckerman Mind Brain Behavior Institute Columbia University New York NY USA. Department of Computer Science Northern Illinois Universit

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search for Nonresonant Pair Production of Highly energetic Higgs bosons Decaying to bottom 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. bergauer 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. schöfbeck D. schwarz s. Templ W. Waltenberger C.-e. Wulz M. R. Darwish T. Janssen T. Kello H. Rejeb sfar P. Van Mechelen e. s. bols 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. Clerbaux 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 bemden C. Vander Velde P. Vanlaer D. Dobur J. Knolle L. Lamb.e.ht G. Mestdach M. Niedziela C. Rendón C. Roskas A. samalan K. skovpen M. Tytgat N. Van Den bossche b. Vermassen L. Wezenb.e. A. benecke G. bruno F. bury 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. Rebello Teles W. L. Aldá Júnior M. Alves Gallo Pereira M. barroso Ferreira Filho H. brandao Malbouisson 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. bernardes 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. bauer 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. ban 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 boson (H) pair production via gluon and vector boson (V) fusion is performed in the four-bottom-quark final state, using proton-proton collision data at 13 TeV corresponding to 138 fb−1 collected by the CMs experiment at the LHC. The analysis targets Lorentz-boosted 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： bottom quark Higgs bosons W & Z bosons Hadron colliders

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search for exotic Higgs boson 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. bergauer 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. schöfbeck D. schwarz s. Templ W. Waltenberger C.-e. Wulz M. R. Darwish T. Janssen T. Kello H. Rejeb sfar P. Van Mechelen e. s. bols 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. Clerbaux 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 bemden C. Vander Velde P. Vanlaer D. Dobur J. Knolle L. Lamb.e.ht G. Mestdach M. Niedziela C. Rendón C. Roskas A. samalan K. skovpen M. Tytgat N. Van Den bossche b. Vermassen L. Wezenb.e. A. benecke G. bruno F. bury 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. Rebello Teles W. L. Aldá Júnior M. Alves Gallo Pereira M. barroso Ferreira Filho H. brandao Malbouisson 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. bernardes 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. bauer 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. ban 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 boson decays H→AA, A→γγ in events with two photonlike ob.e.ts. The hypothetical particle A is a low-mass spin-0 particle decaying promptly to a merged diphoton reconstructed as a single photonlike ob.e.t. We analyze the data collected by the CMs experiment at s=13 TeV corresponding to an integrated luminosity of 136 fb−1. No excess above the estimated background is found. We set upper limits on the branching 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 bosons Hadron colliders

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Ob.e.vation 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. bergauer 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. schöfbeck D. schwarz s. Templ W. Waltenberger C.-e. Wulz M. R. Darwish T. Janssen T. Kello H. Rejeb sfar P. Van Mechelen e. s. bols 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. Clerbaux 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 bemden C. Vander Velde P. Vanlaer D. Dobur J. Knolle L. Lamb.e.ht G. Mestdach M. Niedziela C. Rendón C. Roskas A. samalan K. skovpen M. Tytgat N. Van Den bossche b. Vermassen L. Wezenb.e. A. benecke G. bruno F. bury 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. Rebello Teles W. L. Aldá Júnior M. Alves Gallo Pereira M. barroso Ferreira Filho H. brandao Malbouisson 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. bernardes 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. bauer 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. ban 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.e.vation of photon-photon production of τ lepton pairs in ultraperipheral lead-lead collisions. The measurement is based on a data sample with an integrated luminosity of 404 μb−1 collected by the CMs experiment at a center-of-mass energy per nucleon pair of sNN=5.02 TeV. The γγ→τ+τ− process is ob.e.ved 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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