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Precise test of lepton flavour universality in -boson decays into muons and electrons in collisions at with the ATLAS detector

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The European Physical Journal C 2024年第10期84卷 1-33页

作者： Aad, G. Aakvaag, E. Abbott, B. Abdelhameed, S. Abeling, K. Abicht, N. J. Abidi, S. H. Aboelela, M. Aboulhorma, A. Abramowicz, H. Abreu, H. Abulaiti, Y. Acharya, B. S. Ackermann, A. Bourdarios, C. Adam Adamczyk, L. Addepalli, S. V. Addison, M. J. Adelman, J. Adiguzel, A. Adye, T. Affolder, A. A. Afik, Y. Agaras, M. N. Agarwala, J. Aggarwal, A. Agheorghiesei, C. Ahmad, A. Ahmadov, F. Ahmed, W. S. Ahuja, S. Ai, X. Aielli, G. Aikot, A. Tamlihat, M. Ait Aitbenchikh, B. Akbiyik, M. Åkesson, T. P. A. Akimov, A. V. Akiyama, D. Akolkar, N. N. Aktas, S. Khoury, K. Al Alberghi, G. L. Albert, J. Albicocco, P. Albouy, G. L. Alderweireldt, S. Alegria, Z. L. Aleksa, M. Aleksandrov, I. N. Alexa, C. Alexopoulos, T. Alfonsi, F. Algren, M. Alhroob, M. Ali, B. Ali, H. M. J. Ali, S. Alibocus, S. W. Aliev, M. Alimonti, G. Alkakhi, W. Allaire, C. Allbrooke, B. M. M. Allen, J. F. Flores, C. A. Allendes Allport, P. P. Aloisio, A. Alonso, F. Alpigiani, C. Alsolami, Z. M. K. Estevez, M. Alvarez Fernandez, A. Alvarez Cardoso, M. Alves Alviggi, M. G. Aly, M. Coutinho, Y. Amaral Ambler, A. Amelung, C. Amerl, M. Ames, C. G. Amidei, D. Amirie, K. J. Santos, S. P. Amor Dos Amos, K. R. An, S. Ananiev, V. Anastopoulos, C. Andeen, T. Anders, J. K. Andrean, S. Y. Andreazza, A. Angelidakis, S. Angerami, A. Anisenkov, A. V. Annovi, A. Antel, C. Antipov, E. Antonelli, M. Anulli, F. Aoki, M. Aoki, T. Aparo, M. A. Bella, L. Aperio Appelt, C. Apyan, A. Val, S. J. Arbiol Arcangeletti, C. Arce, A. T. H. Arena, E. Arguin, J.-F. Argyropoulos, S. Arling, J.-H. Arnaez, O. Arnold, H. Artoni, G. Asada, H. Asai, K. Asai, S. Asbah, N. A. Ashby Pickering, R. A. Assamagan, K. Astalos, R. Astrand, K. S. V. Atashi, S. Atkin, R. J. Atkinson, M. Atmani, H. Atmasiddha, P. A. Augsten, K. Auricchio, S. Auriol, A. D. Austrup, V. A. Avolio, G. Axiotis, K. Azuelos, G. Babal, D. Bachacou, H. Bachas, K. Bachiu, A. Backman, F. Badea, A. Baer, T. M. Bagnaia, P. Bahmani, M. Bahner, D. Bai, K. Baines, J. T. Baines, L. Baker, O. K. Bakos, E. Gupta, D. Bakshi Balakrishnan, V. Balasubr 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 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 USA Physics Department Southern Methodist University Dallas 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 USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy Department of Physics King’s College London London UK 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 USA School of Physics and Astronomy University of Manchester Manchester UK Department of Physics Northern Illinois University DeKalb USA Department of Physics Istanbul University Istanbul Türkiye Particle Physics Department Rutherford Appleton Laboratory Didcot UK Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz USA Enrico Fermi Institute University of Chicago Chicago USA 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

The ratio of branching ratios of the W boson to muons and electrons, $$R^{\,\mu /e}_W={{\mathcal {B}}(W\rightarrow \mu \nu )}$$ / $${{\mathcal {B}}(W\rightarrow e\nu )}$$ , has been measured using $$140\,\text{ fb}^{-1}\,$$ of pp collision data at $$\sqrt{s}=13$$ $$\text {T}\text {e}\hspace{-1.00006pt}\text {V}$$ collected with the ATLAS detector at the LHC, probing the universality of lepton couplings. The ratio is obtained from measurements of the $$t\bar{t}$$ production cross-section in the ee, $$e\mu $$ and $$\mu \mu $$ dilepton final states. To reduce systematic uncertainties, it is normalised by the square root of the corresponding ratio $$R^{\,\mu \mu /ee}_Z$$ for the Z boson measured in inclusive $$Z\rightarrow ee$$ and $$Z\rightarrow \mu \mu $$ events. By using the precise value of $$R^{\,\mu \mu /ee}_Z$$ determined from $$e^+e^-$$ colliders, the ratio $$R^{\,\mu /e}_W$$ is determined to be $$\begin{aligned} R^{\,\mu /e}_W&= 0.9995\pm 0.0022\,\mathrm {(stat)}\,\pm 0.0036\,\mathrm {(syst)}\\ &\quad \pm 0.0014\,\mathrm {(ext)} . \end{aligned}$$ The three uncertainties correspond to data statistics, experimental systematics and the external measurement of $$R^{\,\mu \mu /ee}_Z$$ , giving a total uncertainty of 0.0045, and confirming the Standard Model assumption of lepton flavour universality in W-boson decays at the 0.5% level.

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Upper Limit on the Photoproduction Cross Section of the Spin-Exotic π1(1600)

arXiv

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arXiv 2024年

作者： Afzal, F. Akondi, C.S. Albrecht, M. Amaryan, M. Arrigo, S. Arroyave, V. Asaturyan, A. Austregesilo, A. Baldwin, Z. Barbosa, F. Barlow, J. Barriga, E. Barsotti, R. Barton, D. Baturin, V. Berdnikov, V.V. Black, T. Boeglin, W. Boer, M. Briscoe, W.J. Britton, T. Cao, S. Chudakov, E. Chung, G. Cole, P.L. Cortes, O. Crede, V. Dalton, M.M. Darulis, D. Deur, A. Dobbs, S. Dolgolenko, A. Dugger, M. Dzhygadlo, R. Ebersole, D. Edo, M. Egiyan, H. Erbora, T. Eugenio, P. Fabrizi, A. Fanelli, C. Fang, S. Fitches, J. Foda, A.M. Furletov, S. Gan, L. Gao, H. Gardner, A. Gasparian, A. Glazier, D. Gleason, C. Goryachev, V.S. Grube, B. Guo, J. Guo, L. Hernandez, J. Hernandez, K. Hoffman, N.D. Hornidge, D. Hou, G. Hurck, P. Hurley, A. Imoehl, W. Ireland, D.G. Ito, M.M. Jaegle, I. Jarvis, N.S. Jeske, T. Jing, M. Jones, R.T. Kakoyan, V. Kalicy, G. Khachatryan, V. Kourkoumelis, C. LaDuke, A. Larin, I. Lawrence, D. Lersch, D.I. Li, H. Liu, B. Livingston, K. Lolos, G.J. Lorenti, L. Lyubovitskij, V. Ma, R. Mack, D. Mahmood, A. Marukyan, H. Matveev, V. McCaughan, M. McCracken, M. Meyer, C.A. Miskimen, R. Mitchell, R.E. Mizutani, K. Neelamana, V. Ng, L. Nissen, E. Orešić, S. Ostrovidov, A.I. Papandreou, Z. Paudel, C. Pedroni, R. Pentchev, L. Peters, K.J. Prather, E. Rakshit, S. Reinhold, J. Remington, A. Ritchie, B.G. Ritman, J. Rodriguez, G. Romanov, D. Saldana, K. Salgado, C. Schadmand, S. Schertz, A.M. Scheuer, K. Schick, A. Schmidt, A. Schumacher, R.A. Schwiening, J. Septian, N. Sharp, P. Shen, X. Shepherd, M.R. Sikes, J. Smith, A. Smith, E.S. Sober, D.I. Somov, A. Somov, S. Stevens, J.R. Strakovsky, I.I. Sumner, B. Suresh, K. Tarasov, V.V. Taylor, S. Teymurazyan, A. Thiel, A. Viducic, T. Whitlatch, T. Wickramaarachchi, N. Wunderlich, Y. Yu, B. Zarling, J. Zhang, Z. Zhou, X. Zihlmann, B. Polytechnic Sciences and Mathematics School of Applied Sciences and Arts Arizona State University TempeAZ85287 United States Department of Physics National and Kapodistrian University of Athens Athens15771 Greece Ruhr-Universität-Bochum Institut für Experimentalphysik BochumD-44801 Germany Helmholtz-Institut für Strahlen- und Kernphysik Universität Bonn BonnD-53115 Germany Department of Physics Carnegie Mellon University PittsburghPA15213 United States Department of Physics The Catholic University of America WashingtonDC20064 United States Department of Physics University of Connecticut StorrsCT06269 United States Department of Physics Duke University DurhamNC27708 United States Department of Physics Florida International University MiamiFL33199 United States Department of Physics Florida State University TallahasseeFL32306 United States Department of Physics The George Washington University WashingtonDC20052 United States School of Physics and Astronomy University of Glasgow GlasgowG12 8QQ United Kingdom GSI Helmholtzzentrum für Schwerionenforschung GmbH DarmstadtD-64291 Germany Institute of High Energy Physics Beijing100049 China Department of Physics Indiana University BloomingtonIN47405 United States National Research Centre Kurchatov Institute Moscow123182 Russia Department of Physics Lamar University BeaumontTX77710 United States Department of Physics University of Massachusetts AmherstMA01003 United States National Research Nuclear University Moscow Engineering Physics Institute Moscow115409 Russia Department of Physics Mount Allison University SackvilleNBE4L 1E6 Canada Department of Physics Norfolk State University NorfolkVA23504 United States Department of Physics North Carolina A&T State University GreensboroNC27411 United States Department of Physics and Physical Oceanography University of North Carolina at Wilmington WilmingtonNC28403 United States Department of Physics Old Dominion University No

The spin-exotic hybrid meson π1(1600) is predicted to have a large decay rate to the ωππ final state. Using 76.6 pb−1 of data collected with the GlueX detector, we measure the cross sections for the reactions γp → ωπ+π−p, γp → ωπ0π0p, and γp → ωπ−π0∆++ in the range Eγ = 8 − 10 GeV. Using isospin conservation, we set the first upper limits on the photoproduction cross sections of the π10(1600) and π1−(1600). We combine these limits with lattice calculations of decay widths and find that photoproduction of η′π is the most sensitive two-body system to search for the π1(1600). Copyright © 2024, The Authors. All rights reserved.

关键词： Bosons

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Measurement of Spin-Density Matrix Elements in ∆++(1232) photoproduction

arXiv

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arXiv 2024年

作者： Afzal, F. Akondi, C.S. Albrecht, M. Amaryan, M. Arrigo, S. Arroyave, V. Asaturyan, A. Austregesilo, A. Baldwin, Z. Barbosa, F. Barlow, J. Barriga, E. Barsotti, R. Barton, D. Baturin, V. Berdnikov, V.V. Black, T. Boeglin, W. Boer, M. Briscoe, W.J. Britton, T. Cao, S. Chudakov, E. Chung, G. Cole, P.L. Cortes, O. Crede, V. Dalton, M.M. Darulis, D. Deur, A. Dobbs, S. Dolgolenko, A. Dugger, M. Dzhygadlo, R. Ebersole, D. Edo, M. Egiyan, H. Erbora, T. Eugenio, P. Fabrizi, A. Fanelli, C. Fang, S. Fitches, J. Foda, A.M. Furletov, S. Gan, L. Gao, H. Gardner, A. Gasparian, A. Glazier, D.I. Gleason, C. Goryachev, V.S. Grube, B. Guo, J. Guo, L. Hernandez, J. Hernandez, K. Hoffman, N.D. Hornidge, D. Hou, G. Hurck, P. Hurley, A. Imoehl, W. Ireland, D.G. Ito, M.M. Jaegle, I. Jarvis, N.S. Jeske, T. Jing, M. Jones, R.T. Kakoyan, V. Kalicy, G. Khachatryan, V. Kourkoumelis, C. LaDuke, A. Larin, I. Lawrence, D. Lersch, D.I. Li, H. Liu, B. Livingston, K. Lolos, G.J. Lorenti, L. Lyubovitskij, V. Ma, R. Mack, D. Mahmood, A. Marukyan, H. Matveev, V. McCaughan, M. McCracken, M. Meyer, C.A. Miskimen, R. Mitchell, R.E. Mizutani, K. Neelamana, V. Ng, L. Nissen, E. Orešić, S. Ostrovidov, A.I. Papandreou, Z. Paudel, C. Pedroni, R. Pentchev, L. Peters, K.J. Prather, E. Rakshit, S. Reinhold, J. Remington, A. Ritchie, B.G. Ritman, J. Rodriguez, G. Romanov, D. Saldana, K. Salgado, C. Schadmand, S. Schertz, A.M. Scheuer, K. Schick, A. Schmidt, A. Schumacher, R.A. Schwiening, J. Septian, N. Sharp, P. Shen, X. Shepherd, M.R. Sikes, J. Smith, A. Smith, E.S. Sober, D.I. Somov, A. Somov, S. Stevens, J.R. Strakovsky, I.I. Sumner, B. Suresh, K. Tarasov, V.V. Taylor, S. Teymurazyan, A. Thiel, A. Viducic, T. Whitlatch, T. Wickramaarachchi, N. Wunderlich, Y. Yu, B. Zarling, J. Zhang, Z. Zhou, X. Zihlmann, B. Polytechnic Sciences and Mathematics School of Applied Sciences and Arts Arizona State University TempeAZ85287 United States Department of Physics National and Kapodistrian University of Athens Athens15771 Greece Ruhr-Universität-Bochum Institut für Experimentalphysik BochumD-44801 Germany Helmholtz-Institut für Strahlen- und Kernphysik Universität Bonn BonnD-53115 Germany Department of Physics Carnegie Mellon University PittsburghPA15213 United States Department of Physics The Catholic University of America WashingtonDC20064 United States Department of Physics University of Connecticut StorrsCT06269 United States Department of Physics Duke University DurhamNC27708 United States Department of Physics Florida International University MiamiFL33199 United States Department of Physics Florida State University TallahasseeFL32306 United States Department of Physics The George Washington University WashingtonDC20052 United States School of Physics and Astronomy University of Glasgow GlasgowG12 8QQ United Kingdom GSI Helmholtzzentrum für Schwerionenforschung GmbH DarmstadtD-64291 Germany Institute of High Energy Physics Beijing100049 China Department of Physics Indiana University BloomingtonIN47405 United States National Research Centre Kurchatov Institute Moscow123182 Russia Department of Physics Lamar University BeaumontTX77710 United States Department of Physics University of Massachusetts AmherstMA01003 United States National Research Nuclear University Moscow Engineering Physics Institute Moscow115409 Russia Department of Physics Mount Allison University SackvilleNBE4L 1E6 Canada Department of Physics Norfolk State University NorfolkVA23504 United States Department of Physics North Carolina A&T State University GreensboroNC27411 United States Department of Physics and Physical Oceanography University of North Carolina at Wilmington Wilmington28403 United States Department of Physics Old Dominion University Norfo

We measure the spin-density matrix elements (SDMEs) of the ∆++(1232) in the photoproduction reaction γp → π−∆++(1232) with the GlueX experiment in Hall D at Jefferson Lab. The measurement uses a linearly-polarized photon beam with energies from 8.2 to 8.8 GeV and the statistical precision of the SDMEs exceeds the previous measurement by three orders of magnitude for the momentum transfer squared region below 1.4 GeV2. The data are sensitive to the previously undetermined relative sign between couplings in existing Regge-exchange models. Linear combinations of the extracted SDMEs allow for a decomposition into natural and unnatural-exchange amplitudes. We find that the unnatural exchange plays an important role in the low momentum transfer region. Copyright © 2024, The Authors. All rights reserved.

关键词： Momentum transfer

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Higher-order moments of the elliptic flow distribution in PbPb collisions at sNN = 5.02 TeV

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Journal of High Energy physics 2024年第2期2024卷 1-45页

作者： Tumasyan, A. Adam, W. Andrejkovic, J.W. Bergauer, T. Chatterjee, S. Damanakis, K. Dragicevic, M. Escalante Del Valle, A. Hussain, P.S. Jeitler, M. Krammer, N. Lechner, L. Liko, D. Mikulec, I. Paulitsch, P. Pitters, F.M. Schieck, J. Schöfbeck, R. Schwarz, D. Sonawane, M. Templ, S. Waltenberger, W. Wulz, C.-E. Darwish, M.R. Janssen, T. Kello, T. Rejeb Sfar, H. Van Mechelen, P. Bols, E.S. D’Hondt, J. De Moor, A. Delcourt, M. El Faham, H. Lowette, S. Moortgat, S. Morton, A. Müller, D. Sahasransu, A.R. Tavernier, S. Van Doninck, W. Vannerom, D. Clerbaux, B. De Lentdecker, G. Favart, L. Hohov, D. Jaramillo, J. Lee, K. Mahdavikhorrami, M. Makarenko, I. Malara, A. Paredes, S. Pétré, L. Postiau, N. Thomas, L. Vanden Bemden, M. Vander Velde, C. Vanlaer, P. Dobur, D. Knolle, J. Lambrecht, L. Mestdach, G. Rendón, C. Samalan, A. Skovpen, K. Tytgat, M. Van Den Bossche, N. Vermassen, B. Wezenbeek, L. Benecke, A. Bruno, G. Bury, F. Caputo, C. David, P. Delaere, C. Donertas, I.S. Giammanco, A. Jaffel, K. Jain, Sa. Lemaitre, V. Mondal, K. Taliercio, A. Tran, T.T. Vischia, P. Wertz, S. Alves, G.A. Coelho, E. Hensel, C. Moraes, A. Rebello Teles, P. Aldá Júnior, W.L. Alves Gallo Pereira, M. Barroso Ferreira Filho, M. Brandao Malbouisson, H. Carvalho, W. Chinellato, J. Da Costa, E.M. Da Silveira, G.G. De Jesus Damiao, D. Dos Santos Sousa, V. Fonseca De Souza, S. Martins, J. Mora Herrera, C. Mota Amarilo, K. Mundim, L. Nogima, H. Santoro, A. Silva Do Amaral, S.M. Sznajder, A. Thiel, M. Vilela Pereira, A. Bernardes, C.A. Calligaris, L. Fernandez Perez Tomei, T.R. Gregores, E.M. Mercadante, P.G. Novaes, S.F. Padula, Sandra S. Aleksandrov, A. Antchev, G. Hadjiiska, R. Iaydjiev, P. Misheva, M. Rodozov, M. Shopova, M. Sultanov, G. Dimitrov, A. Ivanov, T. Litov, L. Pavlov, B. Petkov, P. Petrov, A. Shumka, E. Thakur, S. Cheng, T. Javaid, T. Mittal, M. Yuan, L. Ahmad, M. Bauer, G. Hu, Z. Lezki, S. Yi, K. Chen, G.M. Chen, H.S. Chen, M. Iemmi, F. Jiang, C.H. Kapoor, A. Liao, H. Liu, Z.-A. Milosevic, V. Monti, F. Sharma, R. Tao, J. Thomas-Wilsker 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 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 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 Zhejiang University Zhejiang Hangzhou China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt Center for High Energy Physics (CHEP-FU) Fayoum University El-Fayoum Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics

The hydrodynamic flow-like behavior of charged hadrons in high-energy lead-lead collisions is studied through multiparticle correlations. The elliptic anisotropy values based on different orders of multiparticle cumulants, v₂{2k}, are measured up to the tenth order (k = 5) as functions of the collision centrality at a nucleon-nucleon center-of-mass energy of s_NN = 5.02 TeV. The data were recorded by the CMS experiment at the LHC and correspond to an integrated luminosity of 0.607 nb⁻¹. A hierarchy is observed between the coefficients, with v₂{2} > v₂{4} ≳ v₂{6} ≳ v₂{8} ≳ v₂{10}. Based on these results, centrality-dependent moments for the fluctuation-driven event-by-event v₂ distribution are determined, including the skewness, kurtosis and, for the first time, superskewness. Assuming a hydrodynamic expansion of the produced medium, these moments directly probe the initial-state geometry in high-energy nucleus-nucleus collisions. © The Author(s) 2024.

关键词： Event-by-Event fluctuation Harmonic Flow Heavy Ion Experiments Relativistic Heavy Ion physics

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Large Isospin Asymmetry in Si22/O22 Mirror Gamow-Teller Transitions Reveals the Halo Structure of Al22

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Physical Review Letters 2020年第19期125卷 192503-192503页

作者： J. Lee (李晓菁) X. X. Xu (徐新星) K. Kaneko (金子和也) Y. Sun (孙扬) C. J. Lin (林承键) L. J. Sun (孙立杰) P. F. Liang (梁鹏飞) Z. H. Li (李智焕) J. Li (李晶) H. Y. Wu (吴鸿毅) D. Q. Fang (方德清) J. S. Wang (王建松) Y. Y. Yang (杨彦云) C. X. Yuan (袁岑溪) Y. H. Lam (蓝乙华) Y. T. Wang (王玉廷) K. Wang (王康) J. G. Wang (王建国) J. B. Ma (马军兵) J. J. Liu (刘嘉健) P. J. Li (李朋杰) Q. Q. Zhao (赵青青) L. Yang (杨磊) N. R. Ma (马南茹) D. X. Wang (王东玺) F. P. Zhong (钟福鹏) S. H. Zhong (钟善豪) F. Yang (杨峰) H. M. Jia (贾会明) P. W. Wen (温培威) M. Pan (潘敏) H. L. Zang (臧宏亮) X. Wang (王翔) C. G. Wu (武晨光) D. W. Luo (罗迪雯) H. W. Wang (王宏伟) C. Li (李琛) C. Z. Shi (施晨钟) M. W. Nie (聂茂武) X. F. Li (李秀芳) H. Li (李贺) P. Ma (马朋) Q. Hu (胡强) G. Z. Shi (石国柱) S. L. Jin (金仕纶) M. R. Huang (黄美容) Z. Bai (白真) Y. J. Zhou (周远杰) W. H. Ma (马维虎) F. F. Duan (段芳芳) S. Y. Jin (金树亚) Q. R. Gao (高祺锐) X. H. Zhou (周小红) Z. G. Hu (胡正国) M. Wang (王猛) M. L. Liu (柳敏良) R. F. Chen (陈若富) X. W. Ma (马新文) Department of Physics The University of Hong Kong Hong Kong China CAS Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China Department of Nuclear Physics China Institute of Atomic Energy Beijing 102413 China University of Chinese Academy of Sciences Beijing 100049 China Advanced Energy Science and Technology Guangdong Laboratory Huizhou 516003 China Department of Physics Kyushu Sangyo University Fukuoka 813-8503 Japan School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China College of Physics and Technology Guangxi Normal University Guilin 541004 China National Superconducting Cyclotron Laboratory Michigan State University East Lansing Michigan 48824 USA School of Physic and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China Key Laboratory of Nuclear Physics and Ion-Beam Application (MOE) Institute of Modern Physics Fudan University Shanghai 200433 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China School of Science Huzhou University Huzhou 313000 China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen University Zhuhai 519082 China Institute of Particle and Nuclear Physics Henan Normal University Xinxiang 453007 China School of Physics and Nuclear Energy Engineering Beihang University Beijing 100191 China School of Nuclear Science and Technology Lanzhou University Lanzhou 730000 China

β-delayed one-proton emissions of Si22, the lightest nucleus with an isospin projection Tz=−3, are studied with a silicon array surrounded by high-purity germanium detectors. Properties of β-decay branches and the reduced transition probabilities for the transitions to the low-lying states of Al22 are determined. Compared to the mirror β decay of O22, the largest value of mirror asymmetry in low-lying states by far, with δ=209(96), is found in the transition to the first 1+ excited state. Shell-model calculation with isospin-nonconserving forces, including the T=1, J=2, 3 interaction related to the s1/2 orbit that introduces explicitly the isospin-symmetry breaking force and describes the loosely bound nature of the wave functions of the s1/2 orbit, can reproduce the observed data well and consistently explain the observation that a large δ value occurs for the first but not for the second 1+ excited state of Al22. Our results, while supporting the proton-halo structure in Al22, might provide another means to identify halo nuclei.

关键词： Beta decay nuclear structure & decays Proton emission

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Neutron and γ background measurements of the experimental halls at the CSNS back-streaming white neutron source

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nuclear Instruments and Methods in physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 2020年 980卷 164506-164506页

作者： Li, Qiang Jing, Hantao Zhou, Bin Ning, Changjun Tang, Jingyu Ren, Jie Yi, Han Zhu, Xing Zhang, Liying Jiang, Wei Fan, Ruirui Bao, Jie Feng, Changqing Ruan, Xichao Chen, Yonghao Zhou, Luping Li[a], Yang Tan, Zhixin Chen, Yukai An, Qi Bai, Huaiyong Cao, Ping Chen, Qiping Cheng, Pinjing Cui, Zengqi Gu, Minhao Guo, Fengqin Han, Changcai Han, Zijie He, Guozhu He, Yongcheng He, Yuefeng Huang, Hanxiong Huang, Weiling Huang, Xiru Ji, Xiaolu Ji, Xuyang Jiang, Haoyu Kang, Ling Kang, Mingtao Li, Bo Li, Lun Li, Xiao Li[b], Yang Liu, Rong Liu, Shubin Liu, Xingyan Luan, Guangyuan Ma, Yinglin Qi, Binbin Song, Zhaohui Sun, Hong Sun, Xiaoyang Sun, Zhijia Tang, Hongqing Wang, Pengcheng Wang, Qi Wang, Taofeng Wang, Yanfeng Wang, Zhaohui Wang, Zheng Wen, Jie Wen, Zhongwei Wu, Qingbiao Wu, Xiaoguang Wu, Xuan Xie, Likun Yang, Yiwei Yu, Li Yu, Tao Yu, Yongji Zhang, Guohui Zhang, Jing Zhang, Linhao Zhang, Qingmin Zhang, Qiwei Zhang, Xianpeng Zhang, Yuliang Zhang, Zhiyong Zhao, Yingtan Zhou, Liang Zhou, Zuying Zhu, Danyang Zhu, Kejun Zhu, Peng Beijing100049 China Spallation Neutron Source Science Center Dongguan523803 China Key Laboratory of Nuclear Data China Institute of Atomic Energy Beijing102413 China Sate Key Laboratory of Particle Detection and Electronics China Department of Modern Physics University of Science and Technology of China Hefei230026 China State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing100871 China Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics Mianyang621900 China University of South China Hengyang421001 China Northwest Institute of Nuclear Technology Xi'an710024 China Department of Engineering and Applied Physics University of Science and Technology of China Hefei230026 China School of Physics Beihang University Beijing100083 China Xi'an Jiaotong University Xi'an710049 China

Accurate nuclear data measurements require a good background control of the experimental environment. At the back-streaming white neutron source (the so-called Back-n White Neutron Source) at China Spallation Neutron Source that is dedicated for nuclear data measurements, comprehensive shielding measures have been employed around the neutron beam line to reduce the neutron and γ backgrounds in the experimental end-stations. The basic background generated by the neutron beam without samples was simulated by the Monte Carlo method and correspondingly measured with a Bonner sphere spectrometer. The results show that the experimental measurements and simulations are generally in good agreement, and the neutron background level meets the requirements of the nuclear data experiments. Moreover, the γ background that was measured by using liquid BC501A and NaI scintillator detectors is mainly from the natural radioactivity of environment, and the beam induced γ background is very weak, whereas the natural γ background can be removed by a coincidence in time with beam bunch or be deducted by background measurement without samples. While the present measurements prove that the neutron/γ basic background has been well controlled, the experimentalists can devote the effort to solve the background problem caused by the samples. © 2020 Elsevier B.V.

关键词： Neutron sources

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Direct Measurement of the Spectral Structure of Cosmic-Ray Electrons+Positrons in the TeV Region with CALET on the International Space Station

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Physical Review Letters 2023年第19期131卷 191001-191001页

作者： O. Adriani Y. Akaike K. Asano Y. Asaoka E. Berti G. Bigongiari W. R. Binns M. Bongi P. Brogi A. Bruno J. H. Buckley N. Cannady G. Castellini C. Checchia M. L. Cherry G. Collazuol G. A. de Nolfo K. Ebisawa A. W. Ficklin H. Fuke S. Gonzi T. G. Guzik T. Hams K. Hibino M. Ichimura K. Ioka W. Ishizaki M. H. Israel K. Kasahara J. Kataoka R. Kataoka Y. Katayose C. Kato N. Kawanaka Y. Kawakubo K. Kobayashi K. Kohri H. S. Krawczynski J. F. Krizmanic P. Maestro P. S. Marrocchesi A. M. Messineo J. W. Mitchell S. Miyake A. A. Moiseev M. Mori N. Mori H. M. Motz K. Munakata S. Nakahira J. Nishimura S. Okuno J. F. Ormes S. Ozawa L. Pacini P. Papini B. F. Rauch S. B. Ricciarini K. Sakai T. Sakamoto M. Sasaki Y. Shimizu A. Shiomi P. Spillantini F. Stolzi S. Sugita A. Sulaj M. Takita T. Tamura T. Terasawa S. Torii Y. Tsunesada Y. Uchihori E. Vannuccini J. P. Wefel K. Yamaoka S. Yanagita A. Yoshida K. Yoshida W. V. Zober Department of Physics University of Florence Via Sansone 1–50019 Sesto Fiorentino Italy INFN Sezione di Florence Via Sansone 1–50019 Sesto Fiorentino Italy Waseda Research Institute for Science and Engineering Waseda University 17 Kikuicho Shinjuku Tokyo 162-0044 Japan JEM Utilization Center Human Spaceflight Technology Directorate Japan Aerospace Exploration Agency 2-1-1 Sengen Tsukuba Ibaraki 305-8505 Japan Institute for Cosmic Ray Research The University of Tokyo 5-1-5 Kashiwa-no-Ha Kashiwa Chiba 277-8582 Japan Institute of Applied Physics (IFAC) National Research Council (CNR) Via Madonna del Piano 10 50019 Sesto Fiorentino Italy Department of Physical Sciences Earth and Environment University of Siena via Roma 56 53100 Siena Italy INFN Sezione di Pisa Polo Fibonacci Largo B. Pontecorvo 3–56127 Pisa Italy Department of Physics and McDonnell Center for the Space Sciences Washington University One Brookings Drive St. Louis Missouri 63130-4899 USA Heliospheric Physics Laboratory NASA/GSFC Greenbelt Maryland 20771 USA Center for Space Sciences and Technology University of Maryland Baltimore County 1000 Hilltop Circle Baltimore Maryland 21250 USA Astroparticle Physics Laboratory NASA/GSFC Greenbelt Maryland 20771 USA Center for Research and Exploration in Space Sciences and Technology NASA/GSFC Greenbelt Maryland 20771 USA Department of Physics and Astronomy Louisiana State University 202 Nicholson Hall Baton Rouge Louisiana 70803 USA Department of Physics and Astronomy University of Padova Via Marzolo 8 35131 Padova Italy INFN Sezione di Padova Via Marzolo 8 35131 Padova Italy Institute of Space and Astronautical Science Japan Aerospace Exploration Agency 3-1-1 Yoshinodai Chuo Sagamihara Kanagawa 252-5210 Japan Kanagawa University 3-27-1 Rokkakubashi Kanagawa Yokohama Kanagawa 221-8686 Japan Faculty of Science and Technology Graduate School of Science and Technology Hirosaki University 3 Bunkyo Hirosaki Aomori 036-8561

Detailed measurements of the spectral structure of cosmic-ray electrons and positrons from 10.6 GeV to 7.5 TeV are presented from over 7 years of observations with the CALorimetric Electron Telescope (CALET) on the International Space Station. The instrument, consisting of a charge detector, an imaging calorimeter, and a total absorption calorimeter with a total depth of 30 radiation lengths at normal incidence and a fine shower imaging capability, is optimized to measure the all-electron spectrum well into the TeV region. Because of the excellent energy resolution (a few percent above 10 GeV) and the outstanding e/p separation (105), CALET provides optimal performance for a detailed search of structures in the energy spectrum. The analysis uses data up to the end of 2022, and the statistics of observed electron candidates has increased more than 3 times since the last publication in 2018. By adopting an updated boosted decision tree analysis, a sufficient proton rejection power up to 7.5 TeV is achieved, with a residual proton contamination less than 10%. The observed energy spectrum becomes gradually harder in the lower energy region from around 30 GeV, consistently with AMS-02, but from 300 to 600 GeV it is considerably softer than the spectra measured by DAMPE and Fermi-LAT. At high energies, the spectrum presents a sharp break around 1 TeV, with a spectral index change from −3.15 to −3.91, and a broken power law fitting the data in the energy range from 30 GeV to 4.8 TeV better than a single power law with 6.9 sigma significance, which is compatible with the DAMPE results. The break is consistent with the expected effects of radiation loss during the propagation from distant sources (except the highest energy bin). We have fitted the spectrum with a model consistent with the positron flux measured by AMS-02 below 1 TeV and interpreted the electron+positron spectrum with possible contributions from pulsars and nearby sources. Above 4.8 TeV, a possible contributi

关键词： Cosmic ray acceleration Cosmic ray composition & spectra Cosmic ray propagation Cosmic ray sources Cosmic rays & astroparticles

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Search for short- and long-lived axion-like particles in decays with the ATLAS experiment at the LHC

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The European Physical Journal C 2024年第7期84卷 1-31页

作者： Aad, G. Abbott, B. Abeling, K. Abicht, N. J. Abidi, S. H. Aboulhorma, A. Abramowicz, H. Abreu, H. Abulaiti, Y. Acharya, B. S. Bourdarios, C. Adam Adamczyk, L. Addepalli, S. V. Addison, M. J. Adelman, J. Adiguzel, A. Adye, T. Affolder, A. A. Afik, Y. Agaras, M. N. Agarwala, J. Aggarwal, A. Agheorghiesei, C. Ahmad, A. Ahmadov, F. Ahmed, W. S. Ahuja, S. Ai, X. Aielli, G. Aikot, A. Tamlihat, M. Ait Aitbenchikh, B. Aizenberg, I. Akbiyik, M. Åkesson, T. P. A. Akimov, A. V. Akiyama, D. Akolkar, N. N. Khoury, K. Al Alberghi, G. L. Albert, J. Albicocco, P. Albouy, G. L. Alderweireldt, S. Aleksa, M. Aleksandrov, I. N. Alexa, C. Alexopoulos, T. Alfonsi, F. Algren, M. Alhroob, M. Ali, B. Ali, H. M. J. Ali, S. Alibocus, S. W. Aliev, M. Alimonti, G. Alkakhi, W. Allaire, C. Allbrooke, B. M. M. Allen, J. F. Flores, C. A. Allendes Allport, P. P. Aloisio, A. Alonso, F. Alpigiani, C. Estevez, M. Alvarez Fernandez, A. Alvarez Cardoso, M. Alves Alviggi, M. G. Aly, M. Coutinho, Y. Amaral Ambler, A. Amelung, C. Amerl, M. Ames, C. G. Amidei, D. Santos, S. P. Amor Dos Amos, K. R. Ananiev, V. Anastopoulos, C. Andeen, T. Anders, J. K. Andrean, S. Y. Andreazza, A. Angelidakis, S. Angerami, A. Anisenkov, A. V. Annovi, A. Antel, C. Anthony, M. T. Antipov, E. Antonelli, M. Anulli, F. Aoki, M. Aoki, T. Pozo, J. A. Aparisi Aparo, M. A. Bella, L. Aperio Appelt, C. Apyan, A. Aranzabal, N. Val, S. J. Arbiol Arcangeletti, C. Arce, A. T. H. Arena, E. Arguin, J-F. Argyropoulos, S. Arling, J.-H. Arnaez, O. Arnold, H. Artoni, G. Asada, H. Asai, K. Asai, S. Asbah, N. A. Assamagan, K. Astalos, R. Atashi, S. Atkin, R. J. Atkinson, M. Atmani, H. Atmasiddha, P. A. Augsten, K. Auricchio, S. Auriol, A. D. Austrup, V. A. Avolio, G. Axiotis, K. Azuelos, G. Babal, D. Bachacou, H. Bachas, K. Bachiu, A. Backman, F. Badea, A. Baer, T. M. Bagnaia, P. Bahmani, M. Bailey, A. J. Bailey, V. R. Baines, J. T. Baines, L. Baker, O. K. Bakos, E. Gupta, D. Bakshi Balakrishnan, V. Balasubramanian, R. Baldin, E. M. Balek, P. Ballabene, E. Balli, F. Baltes, L. M. Balunas, W. K. B CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman USA II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Physics Department Brookhaven National Laboratory Upton 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 USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy Department of Physics King’s College London London UK 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 USA School of Physics and Astronomy University of Manchester Manchester UK Department of Physics Northern Illinois University DeKalb USA Department of Physics Istanbul University Istanbul Türkiye Particle Physics Department Rutherford Appleton Laboratory Didcot UK Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz USA CERN 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 CERN Geneva Switzerland Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Department of Physics McGill University Montreal Canada Department of Physics Royal Holloway University of London Egham

Presented is the search for anomalous Higgs boson decays into two axion-like particles (ALPs) using the full Run 2 data set of $$140\,\text {fb}^{-1}$$ of proton-proton collisions at a centre-of-mass energy of $$13\,\text {TeV}$$ recorded by the ATLAS experiment. The ALPs are assumed to decay into two photons, providing sensitivity to recently proposed models that could explain the $$(g-2)_\mu $$ discrepancy. This analysis covers an ALP mass range from 100 to $$62\,\text {GeV}$$ and ALP-photon couplings in the range $$10^{-7}\,\text {TeV}^{-1}

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The Mesoscale Crystallinity of Nacreous Pearls

Research Square

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Research Square 2021年

作者： Gim, Jiseok Koch, Alden Otter, Laura M. Savitzky, Benjamin H. Erland, Sveinung Estroff, Lara A. Jacob, Dorrit E. Hovden, Robert Department of Materials Science & Engineering University of Michigan Ann ArborMI United States Department of Biomedical Engineering University of Michigan Ann ArborMI United States Research School of Earth Sciences Australian National University CanberraACT2600 Australia National Center for Electron Microscopy Molecular Foundry Lawrence Berkeley National Laboratory BerkeleyCA United States Department of Maritime Studies Western Norway University of Applied Sciences Haugesund Norway Department of Materials Science & Engineering Cornell University IthacaNY United States Applied Physics Program University of Michigan Ann ArborMI United States

A pearl’s distinguished beauty and toughness is attributable to the periodic stacking of aragonite tablets known as nacre. Nacre is a naturally occurring mesocrystal that remarkably arises in the absence of translational symmetry. Gleaning the inspiring biomineral design of a pearl requires quantifying its structural coherence and understanding the stochastic processes that govern formation. By characterizing the entire structure of pearls (~3 mm) in cross-section at high resolution, we show nacre is a medium-range mesocrystal formed through nanoparticle assembly processes. Self-correcting growth mechanisms actively remedy disorder and topological defects of the tablets and act as a countervailing force to paracrystallinity (i.e. long-range disorder). Nacre has a correlation length of roughly 16 tablets (~5.5 µm) despite persistent fluctuations and topological defects. For longer distances (> 25 tablets, ~8.5 µm), the frequency spectrum of nacre tablets follows f −1.5 behavior suggesting growth is coupled to external stochastic processes—a universality found across disparate natural phenomena which now includes pearls. © 2021, CC BY.

关键词： Random processes

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Multiplicity-dependent jet modification from di-hadron correlations in pp collisions at = 13 TeV

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Journal of High Energy physics 2025年第3期2025卷 1-32页

作者： Acharya, S. Agarwal, A. Aglieri Rinella, G. Aglietta, L. Agnello, M. Agrawal, N. Ahammed, Z. Ahmad, S. Ahn, S. U. Ahuja, I. Akindinov, A. Akishina, V. Al-Turany, M. Aleksandrov, D. Alessandro, B. Alfanda, H. M. Alfaro Molina, R. Ali, B. Alici, A. Alizadehvandchali, N. Alkin, A. Alme, J. Alocco, G. Alt, T. Altamura, A. R. Altsybeev, I. Alvarado, J. R. Alvarez, C. O. R. Anaam, M. N. Andrei, C. Andreou, N. Andronic, A. Andronov, E. Anguelov, V. Antinori, F. Antonioli, P. Apadula, N. Aphecetche, L. Appelshäuser, H. Arata, C. Arcelli, S. Arnaldi, R. Arneiro, J. G. M. C. A. Arsene, I. C. Arslandok, M. Augustinus, A. Averbeck, R. Averyanov, D. Azmi, M. D. Baba, H. Badalà, A. Bae, J. Baek, Y. W. Bai, X. Bailhache, R. Bailung, Y. Bala, R. Balbino, A. Baldisseri, A. Balis, B. Banoo, Z. Barbasova, V. Barile, F. Barioglio, L. Barlou, M. Barman, B. Barnaföldi, G. G. Barnby, L. S. Barreau, E. Barret, V. Barreto, L. Bartels, C. Barth, K. Bartsch, E. Bastid, N. Basu, S. Batigne, G. Battistini, D. Batyunya, B. Bauri, D. Bazo Alba, J. L. Bearden, I. G. Beattie, C. Becht, P. Behera, D. Belikov, I. Bell Hechavarria, A. D. C. Bellini, F. Bellwied, R. Belokurova, S. Beltran, L. G. E. Beltran, Y. A. V. Bencedi, G. Bensaoula, A. Beole, S. Berdnikov, Y. Berdnikova, A. Bergmann, L. Besoiu, M. G. Betev, L. Bhaduri, P. P. Bhasin, A. Bhattacharjee, B. Bianchi, L. Bielčík, J. Bielčíková, J. Bigot, A. P. Bilandzic, A. Biro, G. Biswas, S. Bize, N. Blair, J. T. Blau, D. Blidaru, M. B. Bluhme, N. Blume, C. Boca, G. Bock, F. Bodova, T. Bok, J. Boldizsár, L. Bombara, M. Bond, P. M. Bonomi, G. Borel, H. Borissov, A. Borquez Carcamo, A. G. Botta, E. Bouziani, Y. E. M. Bratrud, L. Braun-Munzinger, P. Bregant, M. Broz, M. Bruno, G. E. Buchakchiev, V. D. Buckland, M. D. Budnikov, D. Buesching, H. Bufalino, S. Buhler, P. Burmasov, N. Buthelezi, Z. Bylinkin, A. Bysiak, S. A. Cabanillas Noris, J. C. Cabrera, M. F. T. Cai, M. Caines, H. Caliva, A. Calvo Villar, E. Camacho, J. M. M. Camerini, P. Canedo, F. D. M. Cantway, S. L. Carabas, M. Carballo, A. A. Car Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Variable Energy Cyclotron Centre Homi Bhabha National Institute Kolkata India European Organization for Nuclear Research (CERN) Geneva Switzerland Dipartimento di Fisica dell’Università and Sezione INFN Turin Italy Dipartimento DISAT del Politecnico and Sezione INFN Turin Italy Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN Bologna Italy Department of Physics Aligarh Muslim University Aligarh India Korea Institute of Science and Technology Information Daejeon Republic of Korea Faculty of Science P.J. Šafárik University Košice Slovak Republic Frankfurt Institute for Advanced Studies Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt Germany INFN Sezione di Torino Turin Italy Central China Normal University Wuhan China Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico University of Houston Houston United States Sungkyunkwan University Suwon City Republic of Korea Department of Physics and Technology University of Bergen Bergen Norway INFN Sezione di Cagliari Cagliari Italy Institut für Kernphysik Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany INFN Sezione di Bari Bari Italy Physik Department Technische Universität München Munich Germany High Energy Physics Group Universidad Autónoma de Puebla Puebla Mexico Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest Romania University of Derby Derby United Kingdom Universität Münster Institut für Kernphysik Münster Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany INFN Sezione di Padova Padova Italy INFN Sezione di Bologna Bologna Italy Lawrence Berkeley National Laboratory Berkeley United States SUBATECH IMT Atlantique Nantes Université CNRS-IN2P3 Nantes France Laboratoire

Short-range correlations between charged particles are studied via two-particle angular correlations in pp collisions at $$ \sqrt{s} $$ = 13 TeV. The correlation functions are measured as a function of the relative azimuthal angle ∆φ and the pseudorapidity separation ∆η for pairs of primary charged particles within the pseudorapidity interval |η| < 0.9 and the transverse-momentum range 1 < pT < 8 GeV/c. Near-side (|∆φ| < 1.3) peak widths are extracted from a generalised Gaussian fitted over the correlations in full pseudorapidity separation (|∆η| < 1.8), while the per-trigger associated near-side yields are extracted for the short-range correlations (|∆η| < 1.3). Both are evaluated as a function of charged-particle multiplicity obtained by two different event activity estimators. The width of the near-side peak decreases with increasing multiplicity, and this trend is reproduced qualitatively by the Monte Carlo event generators PYTHIA 8, AMPT, and EPOS. However, the models overestimate the width in the low transverse-momentum region (pT < 3 GeV/c). The per-trigger associated near-side yield increases with increasing multiplicity. Although this trend is also captured qualitatively by the considered event generators, the yield is mostly overestimated by the models in the considered kinematic range. The measurement of the shape and yield of the short-range correlation peak can help us understand the interplay between jet fragmentation and event activity, quantify the narrowing trend of the near-side peak as a function of transverse momentum and multiplicity selections in pp collisions, and search for final-state jet modification in small collision systems.

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