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arXiv 2024年

作者： Abusleme, Angel Adam, thomas Adamowicz, Kai Ahmad, shakeel Ahmed, Rizwan Aiello, sebastiano An, Fengpeng An, Qi Andronico, Giuseppe Anfimov, Nikolay Antonelli, Vito Antoshkina, tatiana de André, João Pedro Athayde Marcondes Auguste, Didier Bai, Weidong Balashov, Nikita Baldini, Wander Barresi, Andrea Basilico, Davide Baussan, Eric Bellato, Marco Beretta, Marco Bergnoli, Antonio Bick, Daniel Bieger, Lukas Biktemerova, svetlana Birkenfeld, thilo Blake, iwan Blyth, simon Bolshakova, Anastasia Bongrand, Mathieu Breton, Dominique Brigatti, Augusto Brugnera, Riccardo Bruno, Riccardo Budano, Antonio Busto, Jose Cabrera, Anatael Caccianiga, Barbara Cai, Hao Cai, Xiao Cai, Yanke Cai, Zhiyan Callier, stéphane Calvez, steven Cammi, Antonio Campeny, Agustin Cao, Chuanya Cao, Guofu Cao, Jun Caruso, Rossella Cerna, Cédric Cerrone, Vanessa Chang, Jinfan Chang, Yun Chatrabhuti, Auttakit Chen, Chao Chen, Guoming Chen, Pingping Chen, shaomin Chen, Xin Chen, Yiming Chen, Yixue Chen, Yu Chen, Zelin Chen, Zhangming Chen, Zhiyuan Chen, Zikang Cheng, Jie Cheng, Yaping Cheng, Yu Chin Chepurnov, Alexander Chetverikov, Alexey Chiesa, Davide Chimenti, Pietro Chin, Yen-ting Chou, Po-Lin Chu, Ziliang Chukanov, Artem Claverie, Gérard Clementi, Catia Clerbaux, Barbara Molla, Marta Colomer Di Lorenzo, selma Conforti Coppi, Alberto Corti, Daniele Csakli, simon Cui, Chenyang Corso, Flavio Dal Dalager, Olivia Datta, Jaydeep De La taille, Christophe Deng, Zhi Deng, Ziyan Ding, Xiaoyu Ding, Xuefeng Ding, Yayun Dirgantara, Bayu Dittrich, Carsten Dmitrievsky, sergey Dohnal, tadeas Dolzhikov, Dmitry Donchenko, Georgy Dong, Jianmeng Doroshkevich, Evgeny Dou, Wei Dracos, Marcos Druillole, Frédéric Du, Ran Du, shuxian Duan, Yujie Dugas, Katherine Dusini, stefano Duyang, Hongyue Eck, Jessica Enqvist, timo Fabbri, Andrea Fahrendholz, Ulrike Fan, Lei Fang, Jian Fang, Wenxing Fedoseev, Dmitry Feng, Li-Cheng Feng, Qichun Ferraro, Federico Fournier, Amélie Fritsch, Fritsch Gan, Haonan Gao, Feng Gao, Feng Garfagnini, Alberto Gavrikov, Arsenii Giammarchi, Marco G Yerevan Physics Institute Yerevan Armenia Université Libre de Bruxelles Brussels Belgium Universidade Estadual de Londrina Londrina Brazil Pontificia Universidade Catolica do Rio de Janeiro Rio de Janeiro Brazil ANID Chile Pontificia Universidad Católica de Chile Santiago Chile Beijing Institute of Spacecraft Environment Engineering Beijing China Beijing Normal University Beijing China China Institute of Atomic Energy Beijing China Institute of High Energy Physics Beijing China North China Electric Power University Beijing China School of Physics Peking University Beijing China Tsinghua University Beijing China University of Chinese Academy of Sciences Beijing China Jilin University Changchun China College of Electronic Science and Engineering National University of Defense Technology Changsha China Chengdu University of Technology Chengdu China Chongqing University Chongqing China Dongguan University of Technology Dongguan China Jinan University Guangzhou China Sun Yat-Sen University Guangzhou China Harbin Institute of Technology Harbin China University of Science and Technology of China Hefei China The Radiochemistry and Nuclear Chemistry Group University of South China Hengyang China Wuyi University Jiangmen China Shandong University Jinan China Key Laboratory of Particle Physics and Particle Irradiation of Ministry of Education Shandong University Qingdao China Nanjing University Nanjing China Guangxi University Nanning China East China University of Science and Technology Shanghai China School of Physics and Astronomy Shanghai Jiao Tong University Shanghai China Tsung-Dao Lee Institute Shanghai Jiao Tong University Shanghai China Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological Sciences Shijiazhuang China Nankai University Tianjin China Wuhan University Wuhan China Xi’an Jiaotong University Xi’an China Xiamen University Xiamen China School of Physics and Microelectronics Zhengzhou University Z

We explore the bound neutrons decay into invisible particles (e.g., n → 3ν or nn → 2ν) in the JUNO liquid scintillator detector. the invisible decay includes two decay modes: n → inv and nn → inv. the invisible decays of s-shell neutrons in 12C will leave a highly excited residual nucleus. subsequently, some de-excitation modes of the excited residual nuclei can produce a time- and space-correlated triple coincidence signal in the JUNO detector. Based on a full Monte Carlo simulation informed with the latest available data, we estimate all backgrounds, including inverse beta decay events of the reactor antineutrino ν¯e, natural radioactivity, cosmogenic isotopes and neutral current interactions of atmospheric neutrinos. Pulse shape discrimination and multivariate analysis techniques are employed to further suppress backgrounds. With two years of exposure, JUNO is expected to give an order of magnitude improvement compared to the current best limits. After 10 years of data taking, the JUNO expected sensitivities at a 90% confidence level are τ/B(n → inv) > 5.0 × 1031 yr and τ/B(nn → inv) > 1.4 × 1032 yr. Copyright © 2024, the Authors. All rights reserved.

关键词： Neutrons

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Early spectroscopy and Dense Circumstellar Medium interaction in sN 2023ixf

arXiv

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arXiv 2023年

作者： Bostroem, K. Azalee Pearson, Jeniveve shrestha, Manisha sand, David J. Valenti, stefano Jha, saurabh W. Andrews, Jennifer E. smith, Nathan terreran, Giacomo Green, Elizabeth Dong, Yize Lundquist, Michael Haislip, Joshua Hoang, Emily t. Hosseinzadeh, Griffin Janzen, Daryl Jencson, Jacob E. Kouprianov, Vladimir Paraskeva, Emmy Meza Retamal, Nicolas E. Reichart, Daniel E. Arcavi, iair Bonanos, Alceste Z. Coughlin, Michael W. Dobson, Ross Farah, Joseph Galbany, Lluís Gutiérrez, Claudia Hawley, suzanne Hebb, Leslie Hiramatsu, Daichi Howell, D. Andrew iijima, takashi ilyin, ilya Jhass, Kiran McCully, Curtis Moran, sean Morris, Brett M. Mura, Alessandra C. Müller-Bravo, tomás E. Munday, James Newsome, Megan Pabst, Maria th. Ochner, Paolo Gonzalez, Estefania Padilla Pastorello, Andrea Pellegrino, Craig Piscarreta, Lara Ravi, Aravind P. Reguitti, Andrea salo, Laura Vinkó, József de Vos, Kellie Wheeler, J.C. Williams, G. Grant Wyatt, samuel Steward Observatory University of Arizona 933 North Cherry Avenue TucsonAZ85721-0065 United States Department of Physics and Astronomy University of California Davis 1 Shields Avenue DavisCA95616-5270 United States Department of Physics and Astronomy Rutgers the State University of New Jersey 136 Frelinghuysen Road PiscatawayNJ08854-8019 United States Gemini Observatory 670 North A‘ohoku Place HiloHI96720-2700 United States Las Cumbres Observatory 6740 Cortona Drive Suite 102 GoletaCA93117-5575 United States W. M. Keck Observatory 65-1120 Māmalahoa Highway KamuelaHI96743-8431 United States Department of Physics and Astronomy University of North Carolina 120 East Cameron Avenue Chapel HillNC27599 United States Department of Physics and Engineering Physics University of Saskatchewan 116 Science Place SaskatoonSKS7N 5E2 Canada Department of Physics and Astronomy The Johns Hopkins University 3400 North Charles Street BaltimoreMD21218 United States School of Physics and Astronomy Tel Aviv University Tel Aviv69978 Israel IAASARS National Observatory of Athens Penteli15236 Greece School of Physics and Astronomy University of Minnesota 116 Church Street S.E. MinneapolisMN55455 United States Mullard Space Science Laboratory University College London Holmbury St Mary Dorking SurreyRH5 6NT United Kingdom Isaac Newton Group of Telescopes Apt. de Correos 368 Santa Cruz de la PalmaE-38700 Spain Department of Physics University of California Santa BarbaraCA93106-9530 United States Campus UAB Carrer de Can Magrans s/n BarcelonaE-08193 Spain Institut d’Estudis Espacials de Catalunya Gran Capità 2-4 Edifici Nexus Desp. 201 BarcelonaE-08034 Spain Department of Astronomy University of Washington 3910 15th Avenue NE SeattleWA98195-0002 United States Physics Department Hobart and William Smith Colleges 300 Pulteney Street GenevaNY14456 United States Department of Astronomy Cornell University 245 East Avenue IthacaNY14850

We present the optical spectroscopic evolution of sN 2023ixf seen in sub-night cadence spectra from 1.18 to 15 days after explosion. We identify high-ionization emission features, signatures of interaction with material surrounding the progenitor star, that fade over the first 7 days, with rapid evolution between spectra observed within the same night. We compare the emission lines present and their relative strength to those of other supernovae with early interaction, finding a close match to sN 2020pni and sN 2017ahn in the first spectrum and sN 2014G at later epochs. to physically interpret our observations we compare them to CMFGEN models with confined, dense circumstellar material around a red supergiant progenitor from the literature. We find that very few models reproduce the blended N iii (λλ4634.0, 4640.6)/C iii (λλ4647.5, 4650.0) emission lines observed in the first few spectra and their rapid disappearance thereafter, making this a unique diagnostic. From the best models, we find a mass-loss rate of 10−3 − 10−2 Mo yr−1, which far exceeds the mass-loss rate for any steady wind, especially for a red supergiant in the initial mass range of the detected progenitor. these mass-loss rates are, however, similar to rates inferred for other supernovae with early circumstellar interaction. Using the phase when the narrow emission features disappear, we calculate an outer dense radius of circumstellar material RCsM,out ≈ 5 × 1014 cm and a mean circumstellar material density of ρ = 5.6 × 10−14 g cm−3. this is consistent with the lower limit on the outer radius of the circumstellar material we calculate from the peak Hα emission flux, RCsM, out 9 × 1013 cm. © 2023, CC BY.

关键词： supernovae

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Determination of the Relative sign of the Higgs Boson Couplings to W and Z Bosons Using WH Production via Vector-Boson Fusion with the AtLAs Detector

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Physical Review Letters 2024年第14期133卷 141801页

作者： G. Aad B. Abbott K. Abeling N. J. Abicht s. H. Abidi A. Aboulhorma H. Abramowicz H. Abreu Y. Abulaiti B. s. Acharya C. Adam Bourdarios L. Adamczyk 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 s. Aktas K. Al Khoury G. L. Alberghi J. Albert P. Albicocco G. L. Albouy s. Alderweireldt Z. L. Alegria 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. Ambler 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 s. J. Arbiol Val 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 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. Axi.t.s G. Azuelos D. Babal H. Bachacou K. Bachas A. Bachiu F. Backman A. Badea t. M. Baer P. Bagnaia M. Bahmani D. Bahner A. J. Bailey V. R. Bailey J. t. Baines L. Baines 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. CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Physics Department Brookhaven National Laboratory Upton New York USA Faculté des sciences Université Mohammed V Rabat Morocco Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel Department of Physics New York University New York New York USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy LAPP Université Savoie Mont Blanc CNRS/IN2P3 Annecy France AGH University of Krakow Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Brandeis University Waltham Massachusetts USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Department of Physics Northern Illinois University DeKalb Illinois USA Department of Physics Istanbul University Istanbul Türkiye Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Enrico Fermi Institute University of Chicago Chicago Illinois USA Institut de Física d’Altes Energies (IFAE) Barcelona Institute of Science and Technology Barcelona Spain INFN Sezione di Pavia Italy Dipartimento di Fisica Università di Pavia Pavia Italy Institut für Physik Universität Mainz Mainz Germany Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania Geneva Switzerland Affiliated with an international laboratory covered by a cooperation agreement with Department of Physics McGill University Montreal Quebec Canada Department of Physics Royal Holloway University of London E

the associated production of Higgs and W bosons via vector-boson fusion is highly sensitive to the relative sign of the Higgs boson couplings to W and Z bosons. in this Letter, two searches for this process are presented, using 140 fb−1 of proton-proton collision data at s=13 teV recorded by the AtLAs detector at the LHC. the first search targets scenarios with opposite-sign couplings of the W and Z bosons to the Higgs boson, while the second targets standard model-like scenarios with same-sign couplings. Both analyses consider Higgs boson decays into a pair of b quarks and W boson decays with an electron or muon. the data exclude the opposite-sign coupling hypothesis with a significance beyond 5σ, and the observed (expected) upper limit set on the cross section for vector-boson fusion WH production is 9.0 (8.7) times the standard model value at 95% confidence level.

关键词： Electroweak symmetry breaking signatures with W or Z bosons signatures with jets Higgs bosons

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search for Light Long-Lived Particles in pp Collisions at s=13 teV Using Displaced Vertices in the AtLAs inner Detector

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Physical Review Letters 2024年第16期133卷 161803页

作者： G. Aad E. Aakvaag B. Abbott s. Abdelhameed K. Abeling N. J. Abicht s. H. Abidi M. Aboelela A. Aboulhorma H. Abramowicz H. Abreu Y. Abulaiti B. s. Acharya A. Ackermann C. Adam Bourdarios L. Adamczyk 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 M. Akbiyik t. P. A. Åkesson A. V. Akimov D. Akiyama N. N. Akolkar s. Aktas K. Al Khoury G. L. Alberghi J. Albert P. Albicocco G. L. Albouy s. Alderweireldt Z. L. Alegria 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 Z. M. K. Alsolami M. Alvarez Estevez A. Alvarez Fernandez M. Alves Cardoso M. G. Alviggi M. Aly Y. Amaral Coutinho A. Ambler C. Amelung M. Amerl C. G. Ames D. Amidei K. J. Amirie s. P. Amor Dos santos K. R. Amos s. An V. Ananiev C. Anastopoulos t. Andeen J. K. Anders A. C. Anderson s. Y. Andrean A. Andreazza s. Angelidakis A. Angerami A. V. Anisenkov A. Annovi C. Antel E. Antipov M. Antonelli F. Anulli M. Aoki t. Aoki M. A. Aparo L. Aperio Bella C. Appelt A. Apyan s. J. Arbiol Val 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 R. A. Ashby Pickering K. Assamagan R. Astalos K. s. V. Astrand 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. Axi.t.s G. Azuelos D. Babal H. Bachacou K. Bachas A. Bachiu F. Backman A. Badea t. M. Baer P. Bagnaia M. Bahmani D. Bahner K. Bai J. t. Baines L. Baines O. K. Baker E. Bakos D. Bakshi Gupta L. E. Balabram Filho V. Balakrishnan R. Balasubramanian E. M. Baldin P. Balek E. Ballabene F. Balli L. M. Baltes W. K. Balunas J. Balz i. Bamwidhi E. Banas M. Bandi CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Department for Physics and Technology University of Bergen Bergen Norway Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA New York University Abu Dhabi Abu Dhabi United Arab Emirates II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Physics Department Brookhaven National Laboratory Upton New York USA Physics Department Southern Methodist University Dallas Texas USA Faculté des sciences Université Mohammed V Rabat Morocco Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel Department of Physics New York University New York New York USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy Kirchhoff-Institut für Physik Ruprecht-Karls-Universität Heidelberg Heidelberg Germany LAPP Université Savoie Mont Blanc CNRS/IN2P3 Annecy France AGH University of Krakow Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Brandeis University Waltham Massachusetts USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Department of Physics Northern Illinois University DeKalb Illinois USA Department of Physics Istanbul University Istanbul Türkiye Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Enrico Fermi Institute University of Chicago Chicago Illinois USA Institut de Física d’Altes Energies (IFAE) Barcelona Institute of Science and Technology Barcelona Spain INFN Sezione di Pavia Italy Dipartimento di Fisica Università di Pavia Pavia Italy Institut für Physik Universität Mainz Mainz Germany Department o

A search for long-lived particles (LLPs) using 140 fb−1 of pp collision data with s=13 teV recorded by the AtLAs experiment at the LHC is presented. the search targets LLPs with masses between 5 and 55 GeV that decay hadronically in the AtLAs inner detector. Benchmark models with LLP pair production from exotic decays of the Higgs boson and models featuring long-lived axionlike particles (ALPs) are considered. No significant excess above the expected background is observed. Upper limits are placed on the branching ratio of the Higgs boson to pairs of LLPs, the cross section for ALPs produced in association with a vector boson, and, for the first time, on the branching ratio of the top quark to an ALP and a u/c quark.

关键词： Axion-like particles Higgs bosons top quark Hadron colliders

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statistical Combination of AtLAs Run 2 searches for Charginos and Neutralinos at the LHC

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Physical Review Letters 2024年第3期133卷 031802-031802页

作者： G. Aad B. Abbott K. Abeling N. J. Abicht s. H. Abidi A. Aboulhorma H. Abramowicz H. Abreu Y. Abulaiti B. s. Acharya C. Adam Bourdarios L. Adamczyk 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 s. Aktas K. Al Khoury G. L. Alberghi J. Albert P. Albicocco G. L. Albouy s. Alderweireldt Z. L. Alegria 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. Ambler 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 s. J. Arbiol Val 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 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. Axi.t.s G. Azuelos D. Babal H. Bachacou K. Bachas A. Bachiu F. Backman A. Badea t. M. Baer P. Bagnaia M. Bahmani D. Bahner A. J. Bailey V. R. Bailey J. t. Baines L. Baines 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. CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Physics Department Brookhaven National Laboratory Upton New York USA Faculté des sciences Université Mohammed V Rabat Morocco Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel Department of Physics New York University New York New York USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy LAPP Université Savoie Mont Blanc CNRS/IN2P3 Annecy France AGH University of Krakow Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Brandeis University Waltham Massachusetts USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Department of Physics Northern Illinois University DeKalb Illinois USA Department of Physics Istanbul University Istanbul Türkiye Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Geneva Switzerland Institut de Física d’Altes Energies (IFAE) Barcelona Institute of Science and Technology Barcelona Spain INFN Sezione di Pavia Pavia Italy Dipartimento di Fisica Università di Pavia Pavia Italy Institut für Physik Universität Mainz Mainz Germany Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania Affiliated with an international laboratory covered by a cooperation agreement with Department of Physics McGill University Montreal QC Canada Department of Physics Royal Holloway University of London Egham United Kingdom Department of Modern Physics and State Key Labo

statistical combinations of searches for charginos and neutralinos using various decay channels are performed using 139 fb−1 of pp collision data at s=13 teV with the AtLAs detector at the Large Hadron Collider. searches targeting pure-wino chargino pair production, pure-wino chargino-neutralino production, or Higgsino production decaying via standard model W, Z, or h bosons are combined to extend the mass reach to the produced supersymmetric particles by 30–100 GeV. the depth of the sensitivity of the original searches is also improved by the combinations, lowering the 95% C.L. cross-section upper limits by 15%–40%.

关键词： Hadron-hadron interactions Particle production supersymmetric models superpartners Hadron colliders

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Azimuthal Angle Correlations of Muons Produced via Heavy-Flavor Decays in 5.02 teV Pb+Pb and pp Collisions with the AtLAs Detector

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Physical Review Letters 2024年第20期132卷 202301-202301页

作者： G. Aad B. Abbott K. Abeling N. J. Abicht s. H. Abidi A. Aboulhorma H. Abramowicz H. Abreu Y. Abulaiti B. s. Acharya C. Adam Bourdarios L. Adamczyk 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 s. Aktas K. Al Khoury G. L. Alberghi J. Albert P. Albicocco G. L. Albouy s. Alderweireldt Z. L. Alegria 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. Ambler 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 s. J. Arbiol Val 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 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. Axi.t.s G. Azuelos D. Babal H. Bachacou K. Bachas A. Bachiu F. Backman A. Badea t. M. Baer P. Bagnaia M. Bahmani D. Bahner A. J. Bailey V. R. Bailey J. t. Baines L. Baines 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. CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Physics Department Brookhaven National Laboratory Upton New York USA Faculté des sciences Université Mohammed V Rabat Morocco Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel Department of Physics New York University New York New York USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy LAPP Université Savoie Mont Blanc CNRS/IN2P3 Annecy France AGH University of Krakow Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Brandeis University Waltham Massachusetts USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Department of Physics Northern Illinois University DeKalb Illinois USA Department of Physics Istanbul University Istanbul Türkiye Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA CERN Geneva Switzerland Institut de Física d’Altes Energies (IFAE) Barcelona Institute of Science and Technology Barcelona Spain INFN Sezione di Pavia Italy Dipartimento di Fisica Università di Pavia Pavia Italy Institut für Physik Universität Mainz Mainz Germany Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania Affiliated with an international laboratory covered by a cooperation agreement with CERN Department of Physics McGill University Montreal Québec Canada Department of Physics Royal Holloway University of London Egham United Kingdom Department of Modern Physics and State K

Angular correlations between heavy quarks provide a unique probe of the quark-gluon plasma created in ultrarelativistic heavy-ion collisions. Results are presented of a measurement of the azimuthal angle correlations between muons originating from semileptonic decays of heavy quarks produced in 5.02 teV Pb+Pb and pp collisions at the LHC. the muons are measured with transverse momenta and pseudorapidities satisfying ptμ>4 GeV and |ημ|<2.4, respectively. the distributions of azimuthal angle separation Δϕ for muon pairs having pseudorapidity separation |Δη|>0.8, are measured in different Pb+Pb centrality intervals and compared to the same distribution measured in pp collisions at the same center-of-mass energy. Results are presented separately for muon pairs with opposite-sign charges, same-sign charges, and all pairs. A clear peak is observed in all Δϕ distributions at Δϕ∼π, consistent with the parent heavy-quark pairs being produced via hard-scattering processes. the wi.t.s of that peak, characterized using Cauchy-Lorentz fits to the Δϕ distributions, are found to not vary significantly as a function of Pb+Pb collision centrality and are similar for pp and Pb+Pb collisions. this observation will provide important constraints on theoretical descriptions of heavy-quark interactions with the quark-gluon plasma.

关键词： Jets & heavy flavor physics Particle correlations & fluctuations Quark matter Relativistic heavy-ion collisions

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JUNO sensitivity to the annihilation of MeV dark matter in the galactic halo

arXiv

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arXiv 2023年

作者： Abusleme, Angel Adam, thomas Ahmad, shakeel Ahmed, Rizwan Aiello, sebastiano Akram, Muhammad Aleem, Abid Alexandros, tsagkarakis An, Fengpeng An, Qi Andronico, Giuseppe Anfimov, Nikolay Antonelli, Vito Antoshkina, tatiana Asavapibhop, Burin de André, João Pedro Athayde Marcondes Auguste, Didier Bai, Weidong Balashov, Nikita Baldini, Wander Barresi, Andrea Basilico, Davide Baussan, Eric Bellato, Marco Bergnoli, Antonio Birkenfeld, thilo Blin, sylvie Blum, David Blyth, simon Bolshakova, Anastasia Bongrand, Mathieu Bordereau, Clément Breton, Dominique Brigatti, Augusto Brugnera, Riccardo Bruno, Riccardo Budano, Antonio Busto, Jose Cabrera, Anatael Caccianiga, Barbara Cai, Hao Cai, Xiao Cai, Yanke Cai, Zhiyan Callegari, Riccardo Cammi, Antonio Campeny, Agustin Cao, Chuanya Cao, Guofu Cao, Jun Caruso, Rossella Cerna, Cédric Chan, Chi Chang, Jinfan Chang, Yun Chen, Guoming Chen, Pingping Chen, Po-An Chen, shaomin Chen, Xurong Chen, Yixue Chen, Yu Chen, Zhiyuan Chen, Zikang Cheng, Jie Cheng, Yaping Cheng, Yu Chin Chetverikov, Alexey Chiesa, Davide Chimenti, Pietro Chu, Ziliang Chukanov, Artem Claverie, Gérard Clementi, Catia Clerbaux, Barbara Di Lorenzo, selma Conforti Corti, Daniele Corso, Flavio Dal Dalager, Olivia De La taille, Christophe Deng, Zhi Deng, Ziyan Depnering, Wilfried Diaz, Marco Ding, Xuefeng Ding, Yayun Dirgantara, Bayu Dmitrievsky, sergey Dohnal, tadeas Dolzhikov, Dmitry Donchenko, Georgy Dong, Jianmeng Doroshkevich, Evgeny Dou, Wei Dracos, Marcos Druillole, Frédéric Du, Ran Du, shuxian Dusini, stefano Dvorak, Martin Eck, Jessica Enqvist, timo Fabbri, Andrea Fahrendholz, Ulrike Fan, Donghua Fan, Lei Fang, Jian Fang, Wenxing Fargetta, Marco Fedoseev, Dmitry Fei, Zhengyong Feng, Li-Cheng Feng, Qichun Ferraro, Federico Ford, Richard Fournier, Amélie Gan, Haonan Gao, Feng Garfagnini, Alberto Gavrikov, Arsenii Giammarchi, Marco Giudice, Nunzio Gonchar, Maxim Gong, Guanghua Gong, Hui Gornushkin, Yuri Göttel, Alexandre Grassi, Marco Gromov, Vasily Gu, Minghao Gu, Xiaofei Gu, Yu Guan, Mengyun Guan, Yuduo Guard Yerevan Physics Institute Yerevan Armenia Université Libre de Bruxelles Brussels Belgium Universidade Estadual de Londrina Londrina Brazil Pontificia Universidade Catolica do Rio de Janeiro Rio de Janeiro Brazil Pontificia Universidad Católica de Chile Santiago Chile Universidad Tecnica Federico Santa Maria Valparaiso Chile Beijing Institute of Spacecraft Environment Engineering Beijing China Beijing Normal University Beijing China China Institute of Atomic Energy Beijing China Institute of High Energy Physics Beijing China North China Electric Power University Beijing China School of Physics Peking University Beijing China Tsinghua University Beijing China University of Chinese Academy of Sciences Beijing China Jilin University Changchun China College of Electronic Science and Engineering National University of Defense Technology Changsha China Chongqing University Chongqing China Dongguan University of Technology Dongguan China Jinan University Guangzhou China Sun Yat-Sen University Guangzhou China Harbin Institute of Technology Harbin China University of Science and Technology of China Hefei China The Radiochemistry and Nuclear Chemistry Group University of South China Hengyang China Wuyi University Jiangmen China Shandong University Jinan China Key Laboratory of Particle Physics and Particle Irradiation of Ministry of Education Shandong University Qingdao China Institute of Modern Physics Chinese Academy of Sciences Lanzhou China Nanjing University Nanjing China Guangxi University Nanning China East China University of Science and Technology Shanghai China School of Physics and Astronomy Shanghai Jiao Tong University Shanghai China Tsung-Dao Lee Institute Shanghai Jiao Tong University Shanghai China Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological Sciences Shijiazhuang China Nankai University Tianjin China Wuhan University Wuhan China Xi’an Jiaotong University Xi’an China Xiamen University Xiamen

We discuss JUNO sensitivity to the annihilation of MeV dark matter in the galactic halo via detecting inverse beta decay reactions of electron anti-neutrinos resulting from the annihilation. We study possible backgrounds to the signature, including the reactor neutrinos, diffuse supernova neutrino background, charged- and neutral-current interactions of atmospheric neutrinos, backgrounds from muon-induced fast neutrons and cosmogenic isotopes. A fiducial volume cut, as well as the pulse shape discrimination and the muon veto are applied to suppress the above backgrounds. it is shown that JUNO sensitivity to the thermally averaged dark matter annihilation rate in 10 years of exposure would be significantly better than the present-day best limit set by super-Kamiokande and would be comparable to that expected by Hyper-Kamiokande. © 2023, CC BY.

关键词： Annihilation

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Combination of searches for Resonant Higgs Boson Pair Production Using pp Collisions at s=13 teV with the AtLAs Detector

引用

Physical Review Letters 2024年第23期132卷 231801-231801页

作者： G. Aad E. Aakvaag B. Abbott K. Abeling N. J. Abicht s. H. Abidi A. Aboulhorma H. Abramowicz H. Abreu Y. Abulaiti B. s. Acharya C. Adam Bourdarios L. Adamczyk 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 s. Aktas K. Al Khoury G. L. Alberghi J. Albert P. Albicocco G. L. Albouy s. Alderweireldt Z. L. Alegria 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. Ambler C. Amelung M. Amerl C. G. Ames D. Amidei K. J. Amirie 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 s. J. Arbiol Val 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 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. Axi.t.s G. Azuelos D. Babal H. Bachacou K. Bachas A. Bachiu F. Backman A. Badea t. M. Baer P. Bagnaia M. Bahmani D. Bahner K. Bai A. J. Bailey V. R. Bailey J. t. Baines L. Baines 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. Barbe CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Department for Physics and Technology University of Bergen Bergen Norway Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Physics Department Brookhaven National Laboratory Upton New York USA Faculté des sciences Université Mohammed V Rabat Morocco Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel Department of Physics New York University New York New York USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy LAPP Université Savoie Mont Blanc CNRS/IN2P3 Annecy France AGH University of Krakow Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Brandeis University Waltham Massachusetts USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Department of Physics Northern Illinois University DeKalb Illinois USA Department of Physics Istanbul University Istanbul Türkiye Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Enrico Fermi Institute University of Chicago Chicago Illinois USA Institut de Física d’Altes Energies (IFAE) Barcelona Institute of Science and Technology Barcelona Spain INFN Sezione di Pavia Italy Dipartimento di Fisica Università di Pavia Pavia Italy Institut für Physik Universität Mainz Mainz Germany Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania Geneva Switzerland Affiliated with an international laboratory covered by a cooperation agreement with CERN Department of Physics McGill University Montr

A combination of searches for a new resonance decaying into a Higgs boson pair is presented, using up to 139 fb−1 of pp collision data at s=13 teV recorded with the AtLAs detector at the LHC. the combination includes searches performed in three decay channels: bb¯bb¯, bb¯τ+τ−, and bb¯γγ. No excess above the expected standard Model background is observed and upper limits are set at the 95% confidence level on the production cross section of Higgs boson pairs originating from the decay of a narrow scalar resonance with mass in the range 251 GeV–5 teV. the observed (expected) limits are in the range 0.96–600 fb (1.2–390 fb). the limits are interpreted in the type-i two-Higgs-doublet model and the minimal supersymmetric standard model, and constrain parameter space not previously excluded by other searches.

关键词： Extensions of Higgs sector signatures with Higgs bosons supersymmetric models Hadron colliders

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search for Nearly Mass-Degenerate Higgsinos Using Low-Momentum Mildly Displaced tracks in pp Collisions at s=13 teV with the AtLAs Detector

引用

Physical Review Letters 2024年第22期132卷 221801-221801页

作者： G. Aad E. Aakvaag B. Abbott K. Abeling N. J. Abicht s. H. Abidi M. Aboelela A. Aboulhorma H. Abramowicz H. Abreu Y. Abulaiti B. s. Acharya A. Ackermann C. Adam Bourdarios L. Adamczyk 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 s. Aktas K. Al Khoury G. L. Alberghi J. Albert P. Albicocco G. L. Albouy s. Alderweireldt Z. L. Alegria 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. Ambler C. Amelung M. Amerl C. G. Ames D. Amidei K. J. Amirie s. P. Amor Dos santos K. R. Amos s. An 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 s. J. Arbiol Val 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 K. Assamagan R. Astalos K. s. V. Astrand 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. Axi.t.s G. Azuelos D. Babal H. Bachacou K. Bachas A. Bachiu F. Backman A. Badea t. M. Baer P. Bagnaia M. Bahmani D. Bahner K. Bai A. J. Bailey J. t. Baines L. Baines 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 CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Department for Physics and Technology University of Bergen Bergen Norway Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Physics Department Brookhaven National Laboratory Upton New York USA Physics Department Southern Methodist University Dallas Texas USA Faculté des sciences Université Mohammed V Rabat Morocco Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel Department of Physics New York University New York New York USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy Kirchhoff-Institut für Physik Ruprecht-Karls-Universität Heidelberg Heidelberg Germany LAPP Université Savoie Mont Blanc CNRS/IN2P3 Annecy France AGH University of Krakow Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Brandeis University Waltham Massachusetts USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Department of Physics Northern Illinois University DeKalb Illinois USA Department of Physics Istanbul University Istanbul Türkiye Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Enrico Fermi Institute University of Chicago Chicago Illinois USA Institut de Física d’Altes Energies (IFAE) Barcelona Institute of Science and Technology Barcelona Spain INFN Sezione di Pavia Italy Dipartimento di Fisica Università di Pavia Pavia Italy Institut für Physik Universität Mainz Mainz Germany Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romani

Higgsinos with masses near the electroweak scale can solve the hierarchy problem and provide a dark matter candidate, while detecting them at the LHC remains challenging if their mass splitting is O(1 GeV). this Letter presents a novel search for nearly mass-degenerate Higgsinos in events with an energetic jet, missing transverse momentum, and a low-momentum track with a significant transverse impact parameter using 140 fb−1 of proton-proton collision data at s=13 teV collected by the AtLAs experiment. For the first time since LEP, a range of mass splittings between the lightest charged and neutral Higgsinos from 0.3 to 0.9 GeV is excluded at 95% confidence level, with a maximum reach of approximately 170 GeV in the Higgsino mass.

关键词： signatures with jets signatures with missing energy signatures with new fermions supersymmetric models superpartners Weakly interacting massive particles Hadron colliders Multi-purpose particle detectors

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studies of the Energy Dependence of Diboson Polarization Fractions and the Radiation-Amplitude-Zero Effect in WZ Production with the AtLAs Detector

引用

Physical Review Letters 2024年第10期133卷 101802页

作者： G. Aad E. Aakvaag B. Abbott K. Abeling N. J. Abicht s. H. Abidi M. Aboelela A. Aboulhorma H. Abramowicz H. Abreu Y. Abulaiti B. s. Acharya A. Ackermann C. Adam Bourdarios L. Adamczyk 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 s. Aktas K. Al Khoury G. L. Alberghi J. Albert P. Albicocco G. L. Albouy s. Alderweireldt Z. L. Alegria 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. Ambler C. Amelung M. Amerl C. G. Ames D. Amidei K. J. Amirie s. P. Amor Dos santos K. R. Amos s. An 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 s. J. Arbiol Val 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 K. Assamagan R. Astalos K. s. V. Astrand 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. Axi.t.s G. Azuelos D. Babal H. Bachacou K. Bachas A. Bachiu F. Backman A. Badea t. M. Baer P. Bagnaia M. Bahmani D. Bahner K. Bai J. t. Baines L. Baines 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 CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Department for Physics and Technology University of Bergen Bergen Norway Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Physics Department Brookhaven National Laboratory Upton New York USA Physics Department Southern Methodist University Dallas Texas USA Faculté des sciences Université Mohammed V Rabat Morocco Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel Department of Physics New York University New York New York USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy Kirchhoff-Institut für Physik Ruprecht-Karls-Universität Heidelberg Heidelberg Germany LAPP Université Savoie Mont Blanc CNRS/IN2P3 Annecy France AGH University of Krakow Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Brandeis University Waltham Massachusetts USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Department of Physics Northern Illinois University DeKalb Illinois USA Department of Physics Istanbul University Istanbul Türkiye Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Enrico Fermi Institute University of Chicago Chicago Illinois USA Institut de Física d’Altes Energies (IFAE) Barcelona Institute of Science and Technology Barcelona Spain INFN Sezione di Pavia Italy Dipartimento di Fisica Università di Pavia Pavia Italy Institut für Physik Universität Mainz Mainz Germany Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romani

this Letter presents the first study of the energy dependence of diboson polarization fractions in WZ→ℓνℓ′ℓ′(ℓ,ℓ′=e,μ) production. the dataset used corresponds to an integrated luminosity of 140 fb−1 of proton-proton collisions at a center-of-mass energy of 13 teV recorded by the AtLAs detector. two fiducial regions with an enhanced presence of events featuring two longitudinally polarized bosons are defined. A nonzero fraction of events with two longitudinally polarized bosons is measured with an observed significance of 5.3 standard deviations in the region with 100tZ≤200 GeV and 1.6 standard deviations in the region with ptZ>200 GeV, where ptZ is the transverse momentum of the Z boson. this Letter also reports the first study of the radiation-amplitude-zero effect. Events with two transversely polarized bosons are analyzed for the ΔY(ℓWZ) and ΔY(WZ) distributions defined respectively as the rapidity difference between the lepton from the W boson decay and the Z boson and the rapidity difference between the W boson and the Z boson. significant suppression of events near zero is observed in both distributions. Unfolded ΔY(ℓWZ) and ΔY(WZ) distributions are also measured and compared to theoretical predictions.

关键词： Electroweak interaction Goldstone bosons W & Z bosons Weak boson production Polarization Hadron colliders

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