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First comparison of composite 0.52-55 keV ENA spectra observed by IBEX and Cassini/INCA with simulated ENAs inferred by proton hybrid simulations downstream of the termination shock

arXiv

引用

arXiv 2022年

作者： Gkioulidou, Matina Opher, Merav Kornbleuth, M. Dialynas, K. Giacalone, J. Richardson, J.D. Zank, G.P. Fuselier, S.A. Mitchell, D.G. Krimigis, S.M. Roussos, E. Baliukin, I. Applied Physics Laboratory Johns Hopkins University LaurelMD20723 United States Astronomy Department Boston University BostonMA02215 United States Radcliffe Institute for Advanced Study Harvard University CambridgeMA United States Office of Space Research and Technology Academy of Athens Athens10679 Greece Lunar & Planetary Laboratory University of Arizona TucsonAZ85721 United States Kavli Institute for Astrophysics and Space Research Department of Physics Massachusetts Institute of Technology CambridgeMA United States Department of Space Science The University of Alabama in Huntsville 4 HuntsvilleAL35805 United States Southwest Research Institute San AntonioTX78228 United States University of Texas at San Antonio San AntonioTX78249 United States Max Planck Institute for Solar System Research Justus-von-Liebig-Weg 3 GoettingenD-37077 Germany Space Research Institute Russian Academy of Sciences Profsoyuznaya Str. 84/32 Moscow117997 Russia Moscow Center for Fundamental and Applied Mathematics Lomonosov Moscow State University GSP-1 Leninskie Gory Moscow119991 Russia HSE University Moscow Russia

We present a first comparison of Energetic Neutral Atom (ENA) heliosheath measurements, remotely sensed by the Interstellar Boundary Explorer (IBEX) mission and the Ion and Neutral Camera (INCA) on the Cassini mission, with modeled ENA inferred from interstellar pickup protons that have been accelerated at the termination shock, using hybrid simulations. The observed ENA intensities are an average value over the time period from 2009 to the end of 2012, along the Voyager 2 trajectory. The hybrid simulations parameters for the solar wind, interstellar pickup ions (PUIs), and magnetic field upstream of the termination shock, where Voyager 2 crossed, are based on observations. We report an energy dependent discrepancy between observed and simulated ENA fluxes, with the observed ENA fluxes, being consistently higher than the simulated ones, and discuss possible causes of this discrepancy. Copyright © 2022, The Authors. All rights reserved.

关键词： Pickups

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Mahakala: a Python-based Modular Ray-tracing and Radiative Transfer Algorithm for Curved Space-times

arXiv

引用

arXiv 2023年

作者： Sharma, Aniket Medeiros, Lia Chan, Chi-Kwan Halevi, Goni Mullen, Patrick D. Stone, James M. Wong, George N. Indian Institute of Science Education and Research Mohali Sector 81 SAS Nagar PO Manauli Punjab Mohali140306 India School of Natural Sciences Institute for Advanced Study 1 Einstein Drive PrincetonNJ08540 United States Steward Observatory Department of Astronomy University of Arizona 933 N. Cherry Ave. TucsonAZ85721 United States Data Science Institute University of Arizona 1230 N. Cherry Ave. TucsonAZ85721 United States Program in Applied Mathematics University of Arizona 617 N. Santa Rita TucsonAZ85721 United States Department of Astrophysical Sciences Princeton University 4 Ivy Lane PrincetonNJ08544 United States CCS-2 Los Alamos National Laboratory Los AlamosNM United States Center for Theoretical Astrophysics Los Alamos National Laboratory Los AlamosNM United States Princeton Gravity Initiative Princeton University PrincetonNJ08544 United States

We introduce Mahakala, a Python-based, modular, radiative ray-tracing code for curved space-times. We employ Google’s JAX framework for accelerated automatic differentiation, which can efficiently compute Christoffel symbols directly from the metric, allowing the user to easily and quickly simulate photon trajectories through non-Kerr metrics. JAX also enables Mahakala to run in parallel on both CPUs and GPUs and achieve speeds comparable to C-based codes. Mahakala natively uses the Cartesian Kerr-Schild coordinate system, which avoids numerical issues caused by the "pole" of spherical coordinates. We demonstrate Mahakala’s capabilities by simulating the 1.3 mm wavelength images (the wavelength of Event Horizon Telescope observations) of general relativistic magnetohydrodynamic simulations of low-accretion rate supermassive black holes. The modular nature of Mahakala allows us to easily quantify the relative contribution of different regions of the flow to image features. We show that most of the emission seen in 1.3 mm images originates close to the black hole. We also quantify the relative contribution of the disk, forward jet, and counter jet to 1.3 mm images. Copyright © 2023, The Authors. All rights reserved.

关键词： Python

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Detection of bistable structures via the Conley index and applications to biological systems

arXiv

引用

arXiv 2021年

作者： Jia, Junbo Yang, Pan Zhu, Huaiping Jin, Zhen Duan, Jinqiao Fu, Xinchu Key Laboratory of Systems Biology Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou310024 China Center for Excellence in Molecular Cell Science Shanghai Institute of Biochemistry and Cell Biology Chinese Academy of Sciences Shanghai200031 China School of Mathematical Sciences Changsha Normal University ChangshaHunan410100 China Department of Mathematics and Statistics York University TorontoONM3J 1P3 Canada Complex Systems Research Center Shanxi University TaiyuanShanxi030051 China Department of Applied Mathematics Illinois Institute of Technology ChicagoIL60616 United States Department of Mathematics Shanghai University Shanghai200444 China

Bistability is a ubiquitous phenomenon in life sciences. In this paper, two kinds of bistable structures in dynamical systems are studied: One is two one-point attractors, another is a one-point attractor accompanied by a cycle attractor. By the Conley index theory, we prove that there exist other isolated invariant sets besides the two attractors, and also obtain the possible components and their configuration. Moreover, we find that there is always a separatrix or cycle separatrix, which separates the two attractors. Finally, the biological meanings and implications of these structures are given and *** Codes 34D45, 37B30, 92B05 © 2021, CC BY.

关键词： Biological systems

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Relationship between three-dimensional velocity of filament eruptions and CME association

arXiv

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arXiv 2021年

作者： Seki, Daikichi Otsuji, Kenichi Ishii, Takako T. Asai, Ayumi Ichimoto, Kiyoshi Graduate School of Advanced Integrated Studies in Human Survivability Kyoto University Sakyo Kyoto606-8306 Japan Astronomical Observatory Kyoto University YamashinaKyoto607-8471 Japan Department of Applied Mathematics and Theoretical Physics University of Cambridge Wilberforce Road CambridgeCB3 0WA United Kingdom Centre for the Study of Existential Risk University of Cambridge 16 Mill Lane CambridgeCB2 1SB United Kingdom Space Environment Laboratory Applied Electromagnetic Research Institute National Institute of Information and Communications Technology KoganeiTokyo184-8795 Japan Astronomical Observatory Kyoto University Sakyo Kyoto606-8502 Japan

It is widely recognised that filament disappearances or eruptions are frequently associated with Coronal Mass Ejections (CMEs). Since CMEs are a major source of disturbances of the space environment surrounding the Earth, it is important to investigate these associations in detail for the better prediction of CME occurrence. However, the proportion of filament disappearances associated with CMEs is under debate. The estimates range from ∼10% to ∼90% and could be affected by the manners to select the events. In this study, we aim to reveal what parameters control the association between filament eruptions and CMEs. We analysed the relationships between CME associations and the physical parameters of filaments including their length, maximum ascending velocity, and direction of eruptions using 28 events of filament eruptions observed in Hα. We found that the product of the maximum radial velocity and the filament length is well correlated with the CME occurrence. If the product is larger than 8.0×106 km2 s−1, the filament will become a CME with a probability of 93%, and if the product is smaller than this value, it will not become a CME with a probability of 100%. We suggest a kinetic-energy threshold above which filament eruptions are associated with CMEs. Our findings also suggest the importance of measuring the velocity vector of filament eruption in three-dimensional space for the better prediction of CME occurrence. © 2021, CC BY.

关键词： Earth (planet)

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The development of a split-tail heliosphere and the role of non-ideal processes: a comparison of the BU and Moscow models

arXiv

引用

arXiv 2021年

作者： Kornbleuth, Marc Opher, M. Baliukin, I. Gkioulidou, M. Richardson, J.D. Zank, G.P. Michael, A.T. Tóth, G. Tenishev, V. Izmodenov, V. Alexashov, D. Fuselier, S. Drake, J.F. Dialynas, K. Astronomy Department Boston University BostonMA02215 United States Radcliffe Institute for Advanced Study at Harvard University CambridgeMA02138 United States Space Research Institute of Russian Academy of Sciences Profsoyuznaya Str. 84/32 Moscow117997 Russia Moscow Center for Fundamental and Applied Mathematics Lomonosov Moscow State University GSP-1 Leninskie Gory Moscow119991 Russia HSE University Moscow Russia Applied Physics Laboratory Johns Hopkins University LaurelMD20723 United States Kavli Institute for Astrophysics and Space Research Department of Physics Massachusetts Institute of Technology CambridgeMA United States Department of Space Science University of Alabama in Huntsville 4 Huntsville AL35805 United States University of Michigan Ann ArborMI48109 United States Institute for Problems in Mechanics Vernadskogo 101-1 Moscow119526 Russia Southwest Research Institute San AntonioTX78228 United States Department of Physics Institute for Physical Science and Technology University of Maryland College ParkMD United States Office of Space Research and Technology Academy of Athens Athens10679 Greece

Global models of the heliosphere are critical tools used in the interpretation of heliospheric observations. There are several three-dimensional magnetohydrodynamic (MHD) heliospheric models that rely on different strategies and assumptions. Until now only one paper has compared global heliosphere models, but without magnetic field effects. We compare the results of two different MHD models, the BU and Moscow models. Both models use identical boundary conditions to compare how different numerical approaches and physical assumptions contribute to the heliospheric solution. Based on the different numerical treatments of discontinuities, the BU model allows for the presence of magnetic reconnection, while the Moscow model does not. Both models predict collimation of the solar outflow in the heliosheath by the solar magnetic field and produce a split-tail where the solar magnetic field confines the charged solar particles into distinct north and south columns that become lobes. In the BU model, the ISM flows between the two lobes at large distances due to MHD instabilities and reconnection. Reconnection in the BU model at the port flank affects the draping of the interstellar magnetic field in the immediate vicinity of the heliopause. Different draping in the models cause different ISM pressures, yielding different heliosheath thicknesses and boundary locations, with the largest effects at high latitudes. The BU model heliosheath is 15% thinner and the heliopause is 7% more inwards at the north pole relative to the Moscow model. These differences in the two plasma solutions may manifest themselves in energetic neutral atom measurements of the heliosphere. © 2021, CC BY.

关键词： Magnetohydrodynamics

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An M₆₀L₆₀ metal-peptide capsid with a 60-crossing woven network

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Chem 2025年

作者： Inomata, Yuuki Oguma, Sota Sagara, Nao Nishijima, Ami Saburomaru, Yuta Yoshida, Satoshi Kajitani, Takashi Shimokawa, Koya Sato, Sota Yoshizawa, Michito Fujita, Makoto Sawada, Tomohisa Department of Applied Chemistry School of Engineering The University of Tokyo Mitsui Link Lab Kashiwanoha 1 6-6-2 Kashiwanoha Chiba Kashiwa 277-0882 Japan Laboratory for Chemistry and Life Science Institute of Integrated Research Institute of Science Tokyo 4259 Nagatsuta Midori-ku Yokohama 226-8501 Japan Core Facility Center Research Infrastructure Management Center Institute of Science Tokyo 4259 Nagatsuta Midori-ku Yokohama 226-8501 Japan Department of Mathematics Ochanomizu University 2-1-1 Otsuka Bunkyo-ku Tokyo 112-8610 Japan Department of Life and Coordination-Complex Molecular Science Institute for Molecular Science National Institutes of Natural Sciences 5-1 Higashiyama Myodaiji-cho Aichi Okazaki 444-8787 Japan Tokyo College UT Institutes for Advanced Study The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8654 Japan Division of Advanced Molecular Science Institute for Molecular Science National Institutes of Natural Sciences 5-1 Higashiyama Myodaiji-cho Aichi Okazaki 444-8787 Japan JST PRESTO Saitama Kawaguchi Japan

Controlling topologies of highly entangled molecular strands from scratch has long been challenging. For its realization, repeated cycles of prediction, considering the geometrical constraints behind molecular self-assembly, and synthetic trial-and-error are crucial. Here, we report the chemical construction of an unexplored topological molecule—a dodecahedral link with 60 crossings. This structure, predicted through theoretical considerations, represents an advancement from previous tetrahedral and cubic links. The resulting capsid-like structure, measuring 6.3 nm in size, has an M₆₀L₆₀ composition (M, metal;L, ligand), formed through the folding and assembly of 60 trivalent Cu⁺ ions and 60 tritopic pentapeptide ligands. This entangled topological framework formed a 4.0 nm-sized inner cavity (∼34,000 Å³). The 60-crossing dodecahedral link topology was, in another way using both knot and graph theories, also characterized as a Goldberg T = 3 polyhedron (T, triangulation number) consisting of trefoil knot panels, providing a new roadmap to further giant capsid structures. © 2025 The Author(s)

关键词： cages and capsules coordination self-assembly graph theory knot theory molecular entanglements peptide folding polyhedra SDG9: Industry, innovation, and infrastructure

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Optimalization of enzymatic degradation on oil palm leaves hemicellulose

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AIP Conference Proceedings 2023年第1期2679卷

作者： Anita Kurniati Ni Nyoman Purwani Galih Ayhusta Laras Rohmawati Ali Rohman Afaf Baktir Hery Suwito Kazuo Sakka Makiko Sakka Ni Nyoman Tri Puspaningsih 1Mathematics and Natural Science Study Program Faculty of Science and Technology Kampus C Universitas Airlangga Mulyorejo Surabaya East Jawa 60115 Indonesia 3University-CoE-Research Centre for Bio-Molecule Engineering 2nd Floor ITD Building Kampus C Universitas Airlangga Mulyorejo Surabaya East Java 60115 Indonesia 4Department of Health Faculty of Vocational Studies Kampus B Universitas Airlangga Surabaya East Java 60286 Indonesia 2Department of Chemistry Faculty of Science and Technology Kampus C Universitas Airlangga Mulyorejo Surabaya East Java 60115 Indonesia 5Applied Microbiology Laboratory Graduate School of Bioresource Mie University 1577 Khurimamachiya-cho Tsu 514-8507 Japan

Indonesia is the largest country of oil palm production in the world. The oil palm by-product is still containing almost 80% of carbohydrates, such as cellulose and hemicellulose. This study aimed to optimize the enzymatic degradation of oil palm leaves in order to achieve zero waste of oil palm biomass by-product. Sodium hydroxide (NaOH) solution was used to isolate hemicellulose extraction from oil palm leaves. Various concentrations of NaOH such as 2 M, 2.5 M, 3 M, 3.5 M and 4 M and the reflux times of 2 hours, 4 hours, and 6 hours were used to optimize hemicellulose extraction. The optimum condition for hemicellulose extraction was 3 M NaOH and reflux time was 6 hours, while the yield at that condition was 48.94 % (w/w). The extracted hemicellulose is then hydrolyzed by a xylanolytic enzyme from recombinant Escherichia coli DH5α (namely pTP510). Temperatures of incubation were varied 50°C, 60°C, 70°C, and 80°C for 24 hours at pH 6. The hydrolysis result was analyzed using High Performance Liquid Chromatography (HPLC). Xylose was produced at an optimum temperature of 60°C (120.231 ppm), arabinose at 50°C (26.265 ppm) whereas xylo-oligosaccharide at 50°C (280.465 ppm).

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Jet modification via π0-hadron correlations in Au+Au collisions at √sNN = 200 GeV

arXiv

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arXiv 2024年

作者： Abdulameer, N.J. Acharya, U. Adare, A. Afanasiev, S. Aidala, C. Ajitanand, N.N. Akiba, Y. Al-Bataineh, H. Alexander, J. Alfred, M. Aoki, K. Apadula, N. Aphecetche, L. Asai, J. Asano, H. Atomssa, E.T. Averbeck, R. Awes, T.C. Azmoun, B. Babintsev, V. Bai, M. Baksay, G. Baksay, L. Baldisseri, A. Bandara, N.S. Bannier, B. Barish, K.N. Barnes, P.D. Bassalleck, B. Basye, A.T. Bathe, S. Batsouli, S. Baublis, V. Baumann, C. Bazilevsky, A. Beaumier, M. Beckman, S. Belikov, S. Belmont, R. Bennett, R. Berdnikov, A. Berdnikov, Y. Bichon, L. Bickley, A.A. Blankenship, B. Blau, D.S. Boissevain, J.G. Bok, J.S. Borel, H. Borisov, V. Boyle, K. Brooks, M.L. Bryslawskyj, J. Buesching, H. Bumazhnov, V. Bunce, G. Butsyk, S. Camacho, C.M. Campbell, S. Chang, B.S. Chang, W.C. Charvet, J.L. Chen, C.-H. Chen, D. Chernichenko, S. Chiu, M. Chi, C.Y. Choi, I.J. Choi, J.B. Choudhury, R.K. Chujo, T. Chung, P. Churyn, A. Cianciolo, V. Citron, Z. Cole, B.A. Connors, M. Constantin, P. Corliss, R. Csanád, M. Csörgo, T. d’Enterria, D. Dahms, T. Dairaku, S. Danley, T.W. Das, K. Datta, A. Daugherity, M.S. David, G. DeBlasio, K. Dehmelt, K. Denisov, A. Deshpande, A. Desmond, E.J. Dietzsch, O. Dion, A. Diss, P.B. Donadelli, M. Doomra, V. Do, J.H. Drapier, O. Drees, A. Drees, K.A. Dubey, A.K. Durham, J.M. Durum, A. Dutta, D. Dzhordzhadze, V. Efremenko, Y.V. Ellinghaus, F. En’yo, H. Engelmore, T. Enokizono, A. Esha, R. Eyser, K.O. Fadem, B. Feege, N. Fields, D.E. Finger, M. Finger, M. Firak, D. Fitzgerald, D. Fleuret, F. Fokin, S.L. Fraenkel, Z. Frantz, J.E. Franz, A. Frawley, A.D. Fujiwara, K. Fukao, Y. Fusayasu, T. Gallus, P. Gal, C. Garg, P. Garishvili, I. Ge, H. Giordano, F. Glenn, A. Gong, H. Gonin, M. Gosset, J. Goto, Y. de Cassagnac, R. Granier Grau, N. Greene, S.V. Perdekamp, M. Grosse Gunji, T. Guo, T. Gustafsson, H.-Å. Hachiya, T. Henni, A. Hadj Haggerty, J.S. Hahn, K.I. Hamagaki, H. Hamilton, H.F. Abilene Christian University AbileneTX79699 United States Institute of Physics Academia Sinica Taipei11529 Taiwan Department of Physics Augustana University Sioux FallsSD57197 United States Department of Physics Banaras Hindu University Varanasi221005 India Bhabha Atomic Research Centre Bombay400 085 India Baruch College City University of New York New YorkNY10010 United States Collider-Accelerator Department Brookhaven National Laboratory UptonNY11973-5000 United States Physics Department Brookhaven National Laboratory UptonNY11973-5000 United States University of California-Riverside RiversideCA92521 United States Charles University Faculty of Mathematics and Physics Troja Prague180 00 Czech Republic Science and Technology on Nuclear Data Laboratory China Institute of Atomic Energy Beijing102413 China Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Tokyo Bunkyo113-0033 Japan University of Colorado BoulderCO80309 United States Columbia University New York New York 10027 Nevis Laboratories IrvingtonNY10533 United States Czech Technical University Zikova 4 Prague 6166 36 Czech Republic Dapnia CEA Saclay Gif-sur-YvetteF-91191 France Debrecen University Egyetem tér 1 DebrecenH-4010 Hungary ELTE Eötvös Loránd University Pázmány P. s. 1/A BudapestH-1117 Hungary Ewha Womans University Seoul120-750 Korea Republic of Florida Institute of Technology MelbourneFL32901 United States Florida State University TallahasseeFL32306 United States Georgia State University AtlantaGA30303 United States Hiroshima University Hiroshima Higashi-Hiroshima739-8526 Japan Department of Physics and Astronomy Howard University WashingtonDC20059 United States HUN-REN ATOMKI Bem tér 18/c DebrecenH-4026 Hungary IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino142281 Russia University of Illinois at Urbana-Champaign UrbanaIL61801 United State

High-momentum two-particle correlations are a useful tool for studying jet-quenching effects in the quark-gluon plasma. Angular correlations between neutral-pion triggers and charged hadrons with transverse momenta in the range 4–12 GeV/c and 0.5–7 GeV/c, respectively, have been measured by the PHENIX experiment in 2014 for Au+Au collisions at √sNN = 200 GeV. Suppression is observed in the yield of high-momentum jet fragments opposite the trigger particle, which indicates jet suppression stemming from in-medium partonic energy loss, while enhancement is observed for low-momentum particles. The ratio and differences between the yield in Au+Au collisions and p+p collisions, IAA and ∆AA, as a function of the trigger-hadron azimuthal separation, ∆, are measured for the first time at the Relativistic Heavy Ion Collider. These results better quantify how the yield of low-pT associated hadrons is enhanced at wide angle, which is crucial for studying energy loss as well as medium-response effects. Copyright © 2024, The Authors. All rights reserved.

关键词： Hadrons

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Identified charged-hadron production in p+Al, He3+Au, and Cu+Au collisions at sNN=200GeV and in U+U collisions at sNN=193GeV

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Physical Review C 2024年第5期109卷 054910-054910页

作者： N. J. Abdulameer U. Acharya A. Adare C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto J. Alexander M. Alfred V. Andrieux K. Aoki N. Apadula H. Asano E. T. Atomssa T. C. Awes B. Azmoun V. Babintsev M. Bai X. Bai N. S. Bandara B. Bannier K. N. Barish S. Bathe V. Baublis C. Baumann S. Baumgart A. Bazilevsky M. Beaumier S. Beckman R. Belmont A. Berdnikov Y. Berdnikov L. Bichon D. Black B. Blankenship D. S. Blau J. S. Bok V. Borisov K. Boyle M. L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov S. Butsyk S. Campbell V. Canoa Roman R. Cervantes C.-H. Chen D. Chen M. Chiu C. Y. Chi I. J. Choi J. B. Choi S. Choi P. Christiansen T. Chujo V. Cianciolo Z. Citron B. A. Cole M. Connors R. Corliss Y. Corrales Morales N. Cronin N. Crossette M. Csanád T. Csörgő L. D'Orazio T. W. Danley A. Datta M. S. Daugherity G. David C. T. Dean K. DeBlasio K. Dehmelt A. Denisov A. Deshpande E. J. Desmond L. Ding A. Dion P. B. Diss D. Dixit V. Doomra J. H. Do O. Drapier A. Drees K. A. Drees J. M. Durham A. Durum H. En'yo T. Engelmore A. Enokizono R. Esha K. O. Eyser B. Fadem W. Fan N. Feege D. E. Fields M. Finger, Jr. M. Finger D. Firak D. Fitzgerald F. Fleuret S. L. Fokin J. E. Frantz A. Franz A. D. Frawley Y. Fukao Y. Fukuda T. Fusayasu K. Gainey P. Gallus C. Gal P. Garg A. Garishvili I. Garishvili H. Ge M. Giles F. Giordano A. Glenn X. Gong M. Gonin Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp Y. Gu T. Gunji T. Guo H. Guragain T. Hachiya J. S. Haggerty K. I. Hahn H. Hamagaki H. F. Hamilton J. Hanks S. Y. Han M. Harvey S. Hasegawa T. O. S. Haseler K. Hashimoto R. Hayano T. K. Hemmick T. Hester X. He J. C. Hill K. Hill A. Hodges R. S. Hollis K. Homma B. Hong T. Hoshino N. Hotvedt J. Huang T. Ichihara Y. Ikeda K. Imai Y. Imazu M. Inaba A. Iordanova D. Isenhower A. Isinhue D. Ivanishchev B. V. Jacak S. J. Jeon M. Jezghani X. Jiang Z. Ji B. M. Johnson K. S. Joo D. Jouan D. S. Jumper J. Kamin S. Kanda B. H. Kang J. H. Kang J. S. Kang D. Kapukchyan J. Kapustinsky S. Karthas D. Kawall A. V. Kazantsev J. A. Key V. Khachatrya Debrecen University H-4010 Debrecen Egyetem tér 1 Hungary Georgia State University Atlanta Georgia 30303 USA University of Colorado Boulder Colorado 80309 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Department of Physics University of Michigan Ann Arbor Michigan 48109 USA Chemistry Department State University of New York at Stony Brook Stony Brook New York 11794 USA RIKEN Nishina Center for Accelerator-Based Science Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973 USA Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan Department of Physics and Astronomy Howard University Washington DC 20059 USA KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan Iowa State University Ames Iowa 50011 USA Department of Physics and Astronomy State University of New York at Stony Brook Stony Brook New York 11794 USA Kyoto University Kyoto 606-8502 Japan Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Physics Department Brookhaven National Laboratory Upton New York 11973 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Collider-Accelerator Department Brookhaven National Laboratory Upton New York 11973 USA Science and Technology on Nuclear Data Laboratory China Institute of Atomic Energy Beijing 102413 People's Republic of China Department of Physics University of Massachusetts Amherst Massachusetts 01003 USA University of California-Riverside Riverside California 92521 USA Baruch College City University of New York New York New York 10010 USA Petersburg Nuclear Physics Institute Gatchina Leningrad Region 188300 Russia Physics and Astronomy Department University of North Carolina at Greensboro Greensboro North Carolina 27412 USA Vanderbilt University Nashville Tennessee 37235 USA Saint Petersburg Stat

The PHENIX experiment has performed a systematic study of identified charged-hadron (π±, K±, p, p¯) production at midrapidity in p+Al, He3+Au, and Cu+Au collisions at sNN=200GeV and U+U collisions at sNN=193GeV. Identified charged-hadron invariant transverse-momentum (pT) and transverse-mass (mT) spectra are presented and interpreted in terms of radially expanding thermalized systems. The particle ratios of K/π and p/π have been measured in different centrality ranges of large (Cu+Au and U+U) and small (p+Al and He3+Au) collision systems. The values of K/π ratios measured in all considered collision systems were found to be consistent with those measured in p+p collisions. However, the values of p/π ratios measured in large collision systems reach the values of ≈0.6, which is a factor of ≈2 larger than in p+p collisions. These results can be qualitatively understood in terms of the baryon enhancement expected from hadronization by recombination. Identified charged-hadron nuclear-modification factors (RAB) are also presented. Enhancement of proton RAB values over meson RAB values was observed in central He3+Au, Cu+Au, and U+U collisions. The proton RAB values measured in the p+Al collision system were found to be consistent with RAB values of ϕ, π±, K±, and π0 mesons, which may indicate that the size of the system produced in p+Al collisions is too small for recombination to cause a noticeable increase in proton production.

关键词： Hadron production Relativistic heavy-ion collisions Hadrons Kaons Pions Protons

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Measurement of inclusive jet cross section and substructure in p+p collisions at √s = 200 GeV

arXiv

引用

arXiv 2024年

作者： Abdulameer, N.J. Acharya, U. Aidala, C. Ajitanand, N.N. Akiba, Y. Akimoto, R. Alexander, J. Alfred, M. Andrieux, V. Antsupov, S. Aoki, K. Apadula, N. Asano, H. Atomssa, E.T. Awes, T.C. Azmoun, B. Babintsev, V. Bai, M. Bai, X. Bandara, N.S. Bannier, B. Bannikov, E. Barish, K.N. Bathe, S. Baublis, V. Baumann, C. Baumgart, S. Bazilevsky, A. Beaumier, M. Belmont, R. Berdnikov, A. Berdnikov, Y. Bichon, L. Black, D. Blankenship, B. Blau, D.S. Bok, J.S. Borisov, V. Boyle, K. Brooks, M.L. Bryslawskyj, J. Buesching, H. Bumazhnov, V. Butsyk, S. Campbell, S. Cervantes, R. Chen, C.-H. Chen, D. Chiu, M. Chi, C.Y. Choi, I.J. Choi, J.B. Choi, S. Christiansen, P. Chujo, T. Cianciolo, V. Citron, Z. Cole, B.A. Connors, M. Corliss, R. Cronin, N. Crossette, N. Csanád, M. Csörgo, T. D’Orazio, L. Danley, T.W. Datta, A. Daugherity, M.S. David, G. DeBlasio, K. Dehmelt, K. Denisov, A. Deshpande, A. Desmond, E.J. Ding, L. Dion, A. Dixit, D. Doomra, V. Do, J.H. Drapier, O. Drees, A. Drees, K.A. Durham, J.M. Durum, A. En’yo, H. Engelmore, T. Enokizono, A. Esha, R. Eyser, K.O. Fadem, B. Fan, W. Feege, N. Fields, D.E. Finger, M. Finger, M. Firak, D. Fitzgerald, D. Fleuret, F. Fokin, S.L. Frantz, J.E. Franz, A. Frawley, A.D. Fukao, Y. Fukuda, Y. Fusayasu, T. Gainey, K. Gallus, P. Gal, C. Garg, P. Garishvili, A. Garishvili, I. Ge, H. Giordano, F. Glenn, A. Gong, X. Gonin, M. Goto, Y. de Cassagnac, R. Granier Grau, N. Greene, S.V. Perdekamp, M. Grosse Gunji, T. Guo, T. Guragain, H. Gu, Y. Hachiya, T. Haggerty, J.S. Hahn, K.I. Hamagaki, H. Hamilton, H.F. Hanks, J. Han, S.Y. Hasegawa, S. Haseler, T.O.S. Hashimoto, K. Hayano, R. Hemmick, T.K. Hester, T. He, X. Hill, J.C. Hill, K. Hodges, A. Hollis, R.S. Homma, K. Hong, B. Hoshino, T. Hotvedt, N. Huang, J. Ichihara, T. Ikeda, Y. Imai, K. Imazu, Y. Inaba, M. Iordanova, A. Isenhower, D. Isinhue, A. Ivanishchev, D. Jeon, S.J. Jezghani, M. Abilene Christian University AbileneTX79699 United States Department of Physics Augustana University Sioux FallsSD57197 United States Department of Physics Banaras Hindu University Varanasi221005 India Bhabha Atomic Research Centre Bombay400 085 India Baruch College City University of New York New YorkNY10010 United States Collider-Accelerator Department Brookhaven National Laboratory UptonNY11973-5000 United States Physics Department Brookhaven National Laboratory UptonNY11973-5000 United States University of California-Riverside RiversideCA92521 United States Charles University Faculty of Mathematics and Physics Troja Prague180 00 Czech Republic Science and Technology on Nuclear Data Laboratory China Institute of Atomic Energy Beijing102413 China Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo113-0033 Japan University of Colorado BoulderCO80309 United States Columbia University New YorkNY10027 United States Nevis Laboratories IrvingtonNY10533 United States Czech Technical University Zikova 4 Prague 6166 36 Czech Republic Debrecen University Egyetem tér 1 DebrecenH-4010 Hungary ELTE Eötvös Loránd University Pázmány P. s. 1/A BudapestH-1117 Hungary Ewha Womans University Seoul120-750 Korea Republic of Florida State University TallahasseeFL32306 United States Georgia State University AtlantaGA30303 United States Hanyang University Seoul133-792 Korea Republic of Hiroshima University Hiroshima Higashi-Hiroshima739-8526 Japan Department of Physics and Astronomy Howard University WashingtonDC20059 United States HUN-REN ATOMKI Bem tér 18/c DebrecenH-4026 Hungary IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino142281 Russia University of Illinois at Urbana-Champaign UrbanaIL61801 United States Institute for Nuclear Research The Russian Academy of Sciences prospekt 60-letiya Oktyabrya 7a Moscow117312 R

The jet cross section and jet-substructure observables in p+p collisions at √s = 200 GeV were measured by the PHENIX Collaboration at the Relativistic Heavy Ion Collider (RHIC). Jets are reconstructed from charged-particle tracks and electromagnetic-calorimeter clusters using the anti-kt algorithm with a jet radius R = 0.3 for jets with transverse momentum within 8.0 T g), charged-particle transverse momentum with respect to jet axis (jT), and radial distributions of charged particles within jets (r). Also measured was the distribution of ξ = −ln(z), where z is the fraction of the jet momentum carried by the charged particle. The measurements are compared to theoretical next-to and next-to-next-to-leading-order calculations, pythia event generator, and to other existing experimental results. Indicated from these measurements is a lower particle multiplicity in jets at RHIC energies when compared to models. Also noted are implications for future jet measurements with sPHENIX at RHIC as well as at the future Election-Ion Collider. © 2024, CC BY.

关键词： Momentum

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