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Limits on the Ejecta Mass During the Search for Kilonovae Associated with Neutron Star-Black Hole Mergers: A case study of S230518h, GW230529, S230627c and the Low-Significance Candidate S240422ed

arXiv

引用

arXiv 2025年

作者： Pillas, M. Antier, S. Ackley, K. Ahumada, T. Akl, D. de Almeida, L. Anand, S. Andrade, C. Andreoni, I. Bostroem, K.A. Bulla, M. Burns, E. Cabrera, T. Chang, S. Choi, H. O’Connor, B. Coughlin, M.W. Corradi, W. Gibbs, A.R. Dietrich, T. Dornic, D. Ducoin, J.-G. Duverne, P.-A. Dyer, M. Eggenstein, H.-B. Freeberg, M. Fausnaugh, M. Fong, W. Foucart, F. Frostig, D. Guessoum, N. Gupta, V. Hello, P. Hosseinzadeh, G. Hu, L. Hussenot-Desenonges, T. Im, M. Jayaraman, R. Jeong, M. Karambelkar, V. Karpov, S. Kasliwal, M. Kilpatrick, C.D. Kim, S. Kochiashvili, N. Kunnumkai, K. Lamoureux, M. Lee, C.U. Lourie, N. Lyman, J. Magnani, F. Mašek, M. Mo, G. Molham, M. Navarete, F. O’Neill, D. Nicholl, M. Nitz, A.H. Noysena, K. Paek, G.S.H. Palmese, A. Poggiani, R. Pradier, T. Pyshna, O. Rajabov, Y. Rastinejad, J.C. Sand, D.J. Shawhan, P. Shrestha, M. Simcoe, R. Smartt, S.J. Steeghs, D. Stein, R. Stevance, H.F. Sun, M. Takey, A. Toivonen, A. Turpin, D. Ulaczyk, K. Wold, A. Wouters, T. STAR Institute Liege University Allée du Six Août Liege19C B-4000 Belgium Université de la Côte d’Azur ARTEMIS Nice France IJCLab Univ Paris-Saclay CNRS IN2P3 Orsay France Department of Physics University of Warwick Gibbet Hill Road CoventryCV4 7AL United Kingdom Division of Physics Mathematics and Astronomy California Institute of Technology PasadenaCA91125 United States American University of Sharjah Physics Department PO Box 26666 Sharjah United Arab Emirates Laboratório Nacional de Astrofísica Rua Estado Unidos 154 - MG Itajubá37504-364 Brazil School of Physics and Astronomy University of Minnesota MinneapolisMN55455 United States Department of Physics and Astronomy University of North Carolina at Chapel Hill Chapel HillNC27599-3255 United States Steward Observatory University of Arizona 933 North Cherry Avenue TucsonAZ85721-0065 United States Department of Physics and Earth Science University of Ferrara via Saragat 1 FerraraI-44122 Italy INFN Sezione di Ferrara via Saragat 1 FerraraI-44122 Italy INAF Osservatorio Astronomico d’Abruzzo via Mentore Maggini snc Teramo64100 Italy Department of Physics & Astronomy Louisiana State University Baton RougeLA70803 United States McWilliams Center for Cosmology and Astrophysics Department of Physics Carnegie Mellon University PittsburghPA15213 United States SNU Astronomy Research Center Astronomy Program Department of Physics & Astronomy Seoul National University 1 Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of Lunar and Planetary Laboratory University of Arizona 1629 East University Boulevard TucsonAZ85721-0092 United States Institut für Physik und Astronomie Universität Potsdam Haus 28 Karl-Liebknecht-Str. 24/25 Potsdam14476 Germany Am Mühlenberg 1 Potsdam14476 Germany CPPM Aix Marseille Univ CNRS IN2P3 CPPM Marseille France Université Paris Cité CNRS Astroparticule et Cosmologie ParisF-75013 France Astrophysics Research Cluster School of Mathematical and

Neutron star–black hole (NSBH) mergers, detectable via their gravitational-wave (GW) emission, are expected to produce kilonovae (KNe). Four NSBH candidates have been identified and followed-up by more than fifty instruments since the start of the fourth GW Observing Run (O4), in May 2023, up to July 2024;however, no confirmed associated KN has been detected. This study evaluates ejecta properties from multi-messenger observations to understand the absence of detectable KN: we use GW public information and joint observations taken from 05.2023 to 07.2024 (LVK, ATLAS, DECam, GECKO, GOTO, GRANDMA, SAGUARO, TESS, WINTER, ZTF). First, our analysis on followup observation strategies shows that, on average, more than 50% of the simulated KNe associated with NSBH mergers reach their peak luminosity around one day after merger in the g, r, i- bands, which is not necessarily covered for each NSBH GW candidate. We also analyze the trade-off between observation efficiency and the intrinsic properties of the KN emission, to understand the impact on how these constraints affect our ability to detect the KN, and underlying ejecta properties for each GW candidate. In particular, we can only confirm the kilonova was not missed for 1% of the GW230529 and S230627c sky localization region, given the large sky localization error of GW230529 and the large distance for S230627c and, their respective KN faint luminosities. More constraining, for S230518h, we infer the dynamical ejecta and post-merger disk wind ejecta mdyn, mwind ☉ and the viewing angle θ > 25◦. Similarly, the non-astrophysical origin of S240422ed is likely further confirmed by the fact that we would have detected even a faint KN at the time and presumed distance of the S240422ed event candidate, within a minimum 45% credible region of the sky area, that can be larger depending on the KN scenario. Copyright © 2025, The Authors. All rights reserved.

关键词： Black holes

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ATOMS: ALMA three-millimeter observations of massive star-forming regions – XVIII. On the origin and evolution of dense gas fragments in molecular shells of compact H ii regions

arXiv

引用

arXiv 2024年

作者： Zhang, Siju Liu, Tie Wang, Ke Zavagno, Annie Garay, Guido Liu, Hongli Xu, Fengwei Liu, Xunchuan Sanhueza, Patricio Soam, Archana Zhou, Jian-Wen Li, Shanghuo Goldsmith, Paul F. Zhang, Yong Chibueze, James O. Lee, Chang Won Hwang, Jihye Bronfman, Leonardo Dewangan, Lokesh K. Kavli Institute for Astronomy and Astrophysics Peking University 5 Yiheyuan Road Haidian District Beijing100871 China Departamento de Astronomía Universidad de Chile Las Condes Santiago7591245 Chile Shanghai Astronomical Observatory Chinese Academy of Sciences 80 Nandan Road Shanghai200030 China Key Laboratory for Research in Galaxies and Cosmology Chinese Academy of Sciences 80 Nandan Road Shanghai200030 China Aix Marseille Univ CNRS CNES LAM Marseille France Institut Universitaire de France Paris 1 rue Descartes Paris75231 Cedex 05 France Chinese Academy of Sciences South America Center for Astronomy National Astronomical Observatories CAS Beijing100101 China School of Physics and Astronomy Yunnan University Kunming650091 China Department of Astronomy School of Physics Peking University Beijing100871 China National Astronomical Observatory of Japan National Institutes of Natural Sciences 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Astronomical Science Program The Graduate University for Advanced Studies SOKENDAI 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Indian Institute of Astrophysics II Block Koramangala Bengaluru560034 India Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 Bonn53121 Germany Max Planck Institute for Astronomy Konigstuhl 17 HeidelbergD-69117 Germany Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive PasadenaCA91109 United States School of Physics and Astronomy Sun Yat-sen University 2 Daxue Road Tangjia Guangdong Province Zhuhai China Department of Mathematical Sciences University of South Africa Cnr Christian de Wet Rd and Pioneer Avenue Florida Park Roodepoort1709 South Africa Department of Physics and Astronomy Faculty of Physical Sciences University of Nigeria Carver Building 1 University Road Nsukka410001 Nigeria Korea Astronomy and Space Science Institute 776 Daedeokdaero Yuseong-gu Daejeon34055 Korea Republic of 217 Gajeong-ro Yuseong-gu Daejeon341

Fragmentation and evolution for the molecular shells of the compact H ii regions are less explored compared to their evolved counterparts. We map nine compact H ii regions with a typical diameter of 0.4 pc that are surrounded by molecular shells traced by CCH. Several to a dozen dense gas fragments probed by H13CO+ are embedded in these molecular shells. These gas fragments, strongly affected by the H ii region, have a higher surface density, mass, and turbulence than those outside the shells but within the same pc-scale natal clump. These features suggest that the shells swept up by the early H ii regions can enhance the formation of massive dense structures that may host the birth of higher-mass stars. We examine the formation of fragments and find that fragmentation of the swept-up shell is unlikely to occur in these early H ii regions, by comparing the expected time scale of shell fragmentation with the age of H ii region. We propose that the appearance of gas fragments in these shells is probably the result of sweeping up pre-existing fragments into the molecular shell that has not yet fragmented. Taken together, this work provides a basis for understanding the interplay of star-forming sites with an intricate environment containing ionization feedback such as those observed in starburst regions. © 2024, CC BY.

关键词： Giant stars

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Single-Atom or Dual-Atom in TiO2Nanosheet: Which is the Better Choice for Electrocatalytic Urea Synthesis?

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Angewandte Chemie 2022年第8期135卷

作者： Lu Pan Jingnan Wang Dr. Fei Lu Qiang Liu Yuhang Gao Yan Wang Jingzhe Jiang Chao Sun Dr. Jian Wang Prof. Xi Wang Department of Physics School of Physical Science and Engineering Beijing Jiaotong University Beijing 100044 P. R. China School of Chemical Engineering and Technology Tianjin University Molecular Plus and Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072 P. R. China College of Physical Science and Technology Yangzhou University Yangzhou 225002 P. R. China Key Laboratory of Photochemistry Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China Research Center for Magnetic and Spintronic Materials National Institute for Materials Science Tsukuba 305-0047 Japan

As rising star materials, single-atom and dual-atom catalysts have been widely reported in the electro-catalysis area. To answer the key question: single-atom and dual-atom catalysts, which is better for electrocatalytic urea synthesis? we design two types of catalysts via a vacancy-anchorage strategy: single-atom Pd 1 −TiO 2 and dual-atom Pd 1 Cu 1 −TiO 2 nanosheets. An ultrahigh urea activity of 166.67 mol urea mol Pd −1 h 1 with the corresponding 22.54 % Faradaic efficiency at −0.5 V vs. reversible hydrogen electrode (RHE) is achieved over Pd 1 Cu 1 −TiO 2 , which is much higher than that of Pd 1 −TiO 2 . Various characterization including an in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and theoretical calculations demonstrate that dual-atom Pd 1 Cu 1 site in Pd 1 Cu 1 −TiO 2 is more favorable for producing urea, which experiences a C−N coupling pathway with a lower energy barrier compared with Pd 1 in Pd 1 −TiO 2 .

关键词： C−N Coupling Dual-Atom Catalyst Electrocatalytic Urea Synthesis Synergistic Effect

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Concentrated Formic Acid from CO2Electrolysis for Directly Driving Fuel Cell

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Angewandte Chemie 2024年第13期136卷

作者： Chao Zhang Xiaobin Hao Jiatang Wang Xiayu Ding Yuan Zhong Yawen Jiang Ming-Chung Wu Prof. Ran Long Wanbing Gong Changhao Liang Prof. Weiwei Cai Jingxiang Low Prof. Yujie Xiong Hefei National Research Center for Physical Sciences at the Microscale School of Chemistry and Materials Science and National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei Anhui 230026 China Suzhou Institute for Advanced Research University of Science and Technology of China Suzhou Jiangsu 215123 China Sustainable Energy Laboratory Faculty of Materials Science and Chemistry China University of Geosciences Wuhan 388 Lumo Road Wuhan Hubei 430074 China Department of Chemical and Materials Engineering Chang Gung University Taoyuan 33302 Taiwan Key Laboratory of Materials Physics Institute of Solid State Physics HFIPS Chinese Academy of Sciences Hefei Anhui 230031 China Anhui Engineering Research Center of Carbon Neutrality The Key Laboratory of Functional Molecular Solids Ministry of Education Anhui Laboratory of Molecular-Based Materials College of Chemistry and Materials Science Anhui Normal University Wuhu Anhui 241002 China

The production of formic acid via electrochemical CO 2 reduction may serve as a key link for the carbon cycle in the formic acid economy, yet its practical feasibility is largely limited by the quantity and concentration of the product. Here we demonstrate continuous electrochemical CO 2 reduction for formic acid production at 2 M at an industrial-level current densities (i.e., 200 mA cm −2 ) for 300 h on membrane electrode assembly using scalable lattice-distorted bismuth catalysts. The optimized catalysts also enable a Faradaic efficiency for formate of 94.2 % and a highest partial formate current density of 1.16 A cm −2 , reaching a production rate of 21.7 mmol cm −2 h −1 . To assess the practicality of this system, we perform a comprehensive techno-economic analysis and life cycle assessment, showing that our approach can potentially substitute conventional methyl formate hydrolysis for industrial formic acid production. Furthermore, the resultant formic acid serves as direct fuel for air-breathing formic acid fuel cells, boasting a power density of 55 mW cm −2 and an exceptional thermal efficiency of 20.1 %.

关键词： lattice distortion electrochemical CO2 reduction solid electrolyte pure formic acid solution direct formic acid fuel cell

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Topochemical Synthesis of Ca3CrN3H Involving a Rotational Structural Transformation for Catalytic Ammonia Synthesis

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Angewandte Chemie 2022年第39期134卷

作者： Yu Cao Dr. Maria A. Kirsanova Prof. Masayuki Ochi Dr. Walid Al Maksoud Dr. Tong Zhu Dr. Rohit Rai Shenghan Gao Tatsuya Tsumori Dr. Shintaro Kobayashi Dr. Shogo Kawaguchi Dr. Edy Abou-Hamad Prof. Kazuhiko Kuroki Prof. Cédric Tassel Prof. Artem M. Abakumov Prof. Yoji Kobayashi Prof. Hiroshi Kageyama Department of Energy and Hydrocarbon Chemistry Graduate School of Engineering Kyoto University Nishikyo-ku Kyoto 615-8510 Japan Center for Energy Science and Technology Skolkovo Institute of Science and Technology Nobel str. 3 121205 Moscow Russia Department of Physics Osaka University Toyonaka Osaka 560-0043 Japan Chemical Science Program KAUST Catalysis Center Division of Physical Science and Engineering King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia Japan Synchrotron Radiation Research Institute Sayo-cho Hyogo 679-5198 Japan Imaging and Characterization Department Core Labs King Abdullah University of Science and Technology Thuwal 23955 Saudi Arabia

Topochemical reactions have led to great progress in the discovery of new metastable compounds with novel chemical and physical properties. With these reactions, the overall crystal structure of the host material is generally maintained. Here we report a topochemical synthesis of a hexagonal nitride hydride, h -Ca 3 CrN 3 H, by heating an orthorhombic nitride, o -Ca 3 CrN 3 , under hydrogen at 673 K, accompanied by a rotational structural transformation. The hydrogen intercalation modifies the Ca−N rock-salt-like atomic packing in o -Ca 3 CrN 3 to a face-sharing octahedral chain in h -Ca 3 CrN 3 H, mimicking a “hinged tessellation” movement. In addition, the h -Ca 3 CrN 3 H exhibited stable ammonia synthesis activity when used as a catalyst.

关键词： Ammonia Synthesis Catalysis Hydrides Mixed Anions Nitrides Topochemistry

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A Scenario for a Carbon-Neutral Ammonia-Fueled Engine Mediated by Catalytic NH3Cracking and CO2Hydrogenation

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Angewandte Chemie 2024年第8期137卷

作者： Jie Ren Hongliang Li Hao Lou Weili Zhou Feng Zeng Yu Wang Xiaokang Liu Chalachew Mebrahtu Gang Pei Jing-Pei Cao Tao Yao Zhandong Wang Jie Zeng Department of Thermal Science and Energy Engineering Hefei National Research Center for Physical Sciences at the Microscale National Synchrotron Radiation Laboratory Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes Department of Chemical Physics University of Science and Technology of China Hefei Anhui 230026 P. R. China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Jiangsu 211816 China SINOPEC Shanghai Research Institute of Petrochemical Technology Co. Ltd. Shanghai 201208 P. R. China Institute for Technical and Macromolecular Chemistry RWTH Aachen University Aachen 52074 Nordrhein-Westfalen Germany Jiangsu Province Engineering Research Center of Fine Utilization of Carbon Resources China University of Mining & Technology Xuzhou 221116 Jiangsu P. R. China School of Chemistry & Chemical Engineering Anhui University of Technology Ma'anshan Anhui 243002 P. R. China

Utilizing near zero-carbon NH 3 as fuel in engines is promising for carbon-neutrality. However, the application of NH 3 into the engine suffers from the intrinsic poor combustion characteristics of NH 3 and the emission of harmful NO x exhausts. Herein, we proposed and successfully confirmed a novel scenario for converting a conventional “CH 4 -fueled” engine to “NH 3 -fueled” engine. Specifically, CH 4 was used to power the internal combustion engine and release CO 2 as the exhaust. Afterwards, we put forward two routes to convert the exhaust and NH 3 into N 2 and CH 4 for enclosing the carbon cycle. The first “spatially decoupled” route splits the exhaust treatment into NH 3 cracking over Ru clusters on the calcined Mg−Al hydrotalcite (Ru/MAO) and CO 2 methanation over a commercial Ni/Al 2 O 3 . Both NH 3 and CO 2 were almost completely converted into the target products under their respective optimal conditions. The second “spatially coupled” route refers to an one-pot reaction of NH 3 and CO 2 into N 2 , CH 4 , and H 2 O. Due to the mismatch of reaction conditions and the competitive adsorption of reactants, the conversions of NH 3 and CO 2 were lowered to 80.1 % and 49.3 %, respectively, over Ru/MAO under 1 bar (CO 2 :NH 3 =3 : 8) at 550 °C.

关键词： Direct coupling CO2 hydrogenation NH3 cracking NH3-CO2 conversion Ammonia engine

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Supramolecular Hydrolase Mimics in Equilibrium and Kinetically Trapped States

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Angewandte Chemie 2023年第9期136卷

作者： Jing Chen Ke Shi Rongjing Chen Zhaoyi Zhai Peiyong Song Prof. Lesley W. Chow Prof. Rona Chandrawati Prof. E. Thomas Pashuck Prof. Fang Jiao Prof. Yiyang Lin State Key Laboratory of Chemical Resource Engineering Beijing Laboratory of Biomedical Materials Beijing University of Chemical Technology Beijing 100029 China Laboratory of Soft Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China Department of Bioengineering Lehigh University Bethlehem PA 18015 USA Department of Materials Science and Engineering Lehigh University Bethlehem PA 18015 USA School of Chemical Engineering Australian Centre for Nanomedicine (ACN) The University of New South Wales (UNSW Sydney) Sydney NSW 2052 Australia

The folding of proteins into intricate three-dimensional structures to achieve biological functions, such as catalysis, is governed by both kinetic and thermodynamic controls. The quest to design artificial enzymes using minimalist peptides seeks to emulate supramolecular structures existing in a catalytically active state. Drawing inspiration from the nuanced process of protein folding, our study explores the enzyme-like activity of amphiphilic peptide nanosystems in both equilibrium and non-equilibrium states, featuring the formation of supramolecular nanofibrils and nanosheets. In contrast to thermodynamically stable nanosheets, the kinetically trapped nanofibrils exhibit dynamic characteristics (e.g., rapid molecular exchange and relatively weak intermolecular packing), resulting in a higher hydrolase-mimicking activity. We emphasize that a supramolecular microenvironment characterized by an optimal local polarity, microviscosity, and β-sheet hydrogen bonding is conducive to both substrate binding and ester bond hydrolysis. Our work underscores the pivotal role of both thermodynamic and kinetic control in impacting biomimetic catalysis and sheds a light on the development of artificial enzymes.

关键词： Artificial Enzyme Catalysis Kinetic Trap Non-Equilibrium Self-Assembly

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An Active and Regenerable Nanometric High-Entropy Catalyst for Efficient Propane Dehydrogenation

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Angewandte Chemie 2024年第43期136卷

作者： Shu-Zhen Zhou Prof. Wen-Cui Li Bowen He Ya-Dong Xie Haowei Wang Prof. Xi Liu Prof. Liwei Chen Prof. Jiake Wei Prof. An-Hui Lu State Key Laboratory of Fine Chemicals Liaoning Key Laboratory for Catalytic Conversion of Carbon Resources School of Chemical Engineering Dalian University of Technology Dalian 116024 P. R. China School of Chemistry and Chemical Engineering In situ Center for Physical Sciences Frontiers Science Center for Transformative Molecules Shanghai Jiao Tong University Shanghai 200240 P. R. China School of Chemistry and Chemical Engineering Ningxia University Yinchuan 750021 P. R. China State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116024 P. R. China

Propane dehydrogenation (PDH) is crucial for propylene production, but commercially employed Pt-based catalysts face susceptibility to deactivation due to the Pt sintering during reaction and regeneration steps. Here, we report a SiO 2 supported nanometric (MnCoCuZnPt) high-entropy PDH catalyst with high activity and stability. The catalyst exhibited a super high propane conversion of 56.6 % with 94 % selectivity of propylene at 600 °C. The propylene productivity reached 68.5 mol C3H6 ⋅ g Pt −1 ⋅ h −1 , nearly three times that of Pt/SiO 2 (23.5 mol C3H6 ⋅ g Pt −1 ⋅ h −1 ) under a weight hourly space velocity of 60 h −1 . In a high-entropy nanoparticle, Pt atoms were atomically dispersed through coordination with other metals and exhibited a positive charge, thereby showcasing remarkable catalytic activity. The high-entropy effect contributes to the catalyst a superior stability with a low deactivation constant of 0.0004 h −1 during 200 hours of reaction under the industrial gas composition at 550 °C. Such high-entropy PDH catalyst is easy regenerated through simple air combustion of deposited coke. After the fourth consecutive regeneration cycle, satisfactory catalytic stability was observed, and the element distribution of spent catalysts almost returned to their initial state, with no detectable Pt sintering. This work provides new insights into designing active, stable, and regenerable novel PDH catalysts.

关键词： high-entropy nanoparticles high dispersion propane dehydrogenation anti-sintering easily regenerable

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Search for B0 → KS0KS0γ decays at Belle

arXiv

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arXiv 2022年

作者： Jeon, H.B. Kang, K.H. Park, H. Adachi, I. Aihara, H. Al Said, S. Asner, D.M. Atmacan, H. Aushev, T. Ayad, R. Babu, V. Bahinipati, S. Behera, P. Belous, K. Bennett, J. Bernlochner, F. Bessner, M. Bhardwaj, V. Bhuyan, B. Bilka, T. Bobrov, A. Bodrov, D. Borah, J. Bozek, A. Bračko, M. Branchini, P. Browder, T.E. Budano, A. Campajola, M. Červenkov, D. Chang, M.-C. Chang, P. Chen, A. Cheon, B.G. Chilikin, K. Cho, H.E. Cho, K. Cho, S.-J. Choi, S.-K. Choi, Y. Choudhury, S. Cinabro, D. Cunliffe, S. Das, S. Dash, N. De Pietro, G. Dhamija, R. Di Capua, F. Dingfelder, J. Doležal, Z. Dong, T.V. Epifanov, D. Ferber, T. Ferlewicz, D. Fulsom, B.G. Garg, R. Gaur, V. Gabyshev, N. Giri, A. Goldenzweig, P. Golob, B. Graziani, E. Gu, T. Gudkova, K. Hadjivasiliou, C. Hara, T. Hayasaka, K. Hayashii, H. Hedges, M.T. Higuchi, T. Hou, W.-S. Hsu, C.-L. Inami, K. Inguglia, G. Ishikawa, A. Itoh, R. Iwasaki, M. Iwasaki, Y. Jacobs, W.W. Jang, E.-J. Jia, S. Jin, Y. Joo, K.K. Kahn, J. Kakuno, H. Kaliyar, A.B. Kawasaki, T. Kiesling, C. Kim, C.H. Kim, D.Y. Kim, K.-H. Kim, K.T. Kim, Y.-K. Kinoshita, K. Kodyš, P. Konno, T. Korobov, A. Korpar, S. Kovalenko, E. Križan, P. Kroeger, R. Krokovny, P. Kuhr, T. Kumar, M. Kumara, K. Kuzmin, A. Kwon, Y.-J. Lai, Y.-T. Lalwani, K. Lam, T. Lange, J.S. Laurenza, M. Lee, S.C. Li, C.H. Li, J. Li, Y. Li, Y.B. Li Gioi, L. Libby, J. Lieret, K. Liventsev, D. Martini, A. Masuda, M. Matsuda, T. Matvienko, D. Maurya, S.K. Merola, M. Metzner, F. Miyabayashi, K. Mizuk, R. Mohanty, G.B. Nakao, M. Narwal, D. Natkaniec, Z. Natochii, A. Nayak, L. Nayak, M. Nisar, N.K. Nishida, S. Ogawa, K. Ogawa, S. Ono, H. Onuki, Y. Oskin, P. Pakhlov, P. Pakhlova, G. Pang, T. Pardi, S. Park, S.-H. Passeri, A. Patra, S. Paul, S. Pedlar, T.K. Pestotnik, R. Piilonen, L.E. Podobnik, T. Popov, V. Prencipe, E. Prim, M.T. Purohit, M.V. Röhrken, M. Rostomyan, A. Department of Physics University of the Basque Country UPV/EHU Bilbao48080 Spain University of Bonn Bonn53115 Germany Brookhaven National Laboratory UptonNY11973 United States Budker Institute of Nuclear Physics SB RAS Novosibirsk630090 Russia Faculty of Mathematics and Physics Charles University Prague121 16 Czech Republic Chonnam National University Gwangju61186 Korea Republic of Chung-Ang University Seoul06974 Korea Republic of University of Cincinnati CincinnatiOH45221 United States Deutsches Elektronen–Synchrotron Hamburg22607 Germany Duke University DurhamNC27708 United States Duy Tan University Hanoi100000 Viet Nam University of Florida GainesvilleFL32611 United States Department of Physics Fu Jen Catholic University Taipei24205 Taiwan Institute of Modern Physics Fudan University Shanghai 200443 China Justus-Liebig-Universität Gießen Gießen 35392 Germany Gifu University Gifu501-1193 Japan Hayama240-0193 Japan Gyeongsang National University Jinju52828 Korea Republic of Department of Physics Institute of Natural Sciences Hanyang University Seoul04763 Korea Republic of University of Hawaii HonoluluHI96822 United States Tsukuba305-0801 Japan Tsukuba305-0801 Japan National Research University Higher School of Economics Moscow101000 Russia Forschungszentrum Jülich Jülich52425 Germany IKERBASQUE Basque Foundation for Science Bilbao48013 Spain Indian Institute of Science Education and Research SAS Nagar Mohali140306 India Indian Institute of Technology Satya Nagar Bhubaneswar751007 India Indian Institute of Technology Assam Guwahati781039 India Indian Institute of Technology Telangana Hyderabad502285 India Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47408 United States Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Institute of High Energy Physics Vienna1050 Austria Institute for High Energy Physics Protvino

We report the first search for the penguin-dominated process B0 → KS0KS0γ using the full data sample of 772 × 106 BB¯ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e− collider. We do not observe any statistically significant signal yield in the KS0-pair invariant mass range 1 GeV/c2 KS0 KS0 2, and set the following upper limits at 90% confidence level: B(B0 → KS0KS0γ) −7, B(B0 → f2γ) × B(f2(1270) → KS0KS0) −7, and B(B0 → f2′γ)×B(f2′(1525) → KS0KS0) −7. Further, 90% confidence upper limits have also been set in the range of [0.7–2.9]×10−7 on the B0 → KS0KS0γ branching fraction in bins of MKS0 KS0 . © 2022, CC BY.

关键词： Luminance

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Search for the decay Bs0 → η′KS0

arXiv

引用

arXiv 2022年

作者： Gebauer, U. Beleño, C. Frey, A. Adachi, I. Adamczyk, K. Aihara, H. Al Said, S. Asner, D.M. Atmacan, H. Aushev, T. Ayad, R. Babu, V. Bahinipati, S. Behera, P. Belous, K. Bennett, J. Bessner, M. Bhardwaj, V. Bhuyan, B. Bilka, T. Biswal, J. Bobrov, A. Bonvicini, G. Bozek, A. Bračko, M. Browder, T.E. Campajola, M. Cao, L. Červenkov, D. Chang, M.-C. Chekelian, V. Chen, A. Cheon, B.G. Chilikin, K. Cho, H.E. Cho, K. Cho, S.-J. Choi, S.-K. Choi, Y. Choudhury, S. Cinabro, D. Cunliffe, S. Das, S. Dash, N. de Nardo, G. Di Capua, F. Dingfelder, J. Doležal, Z. Dong, T.V. Eidelman, S. Epifanov, D. Ferber, T. Ferlewicz, D. Fulsom, B.G. Garg, R. Gaur, V. Gabyshev, N. Garmash, A. Giri, A. Goldenzweig, P. Golob, B. Gudkova, K. Hadjivasiliou, C. Halder, S. Hara, T. Hartbrich, O. Hayasaka, K. Hayashii, H. Hedges, M.T. Hou, W.-S. Hsu, C.-L. Iijima, T. Inami, K. Ishikawa, A. Itoh, R. Iwasaki, M. Iwasaki, Y. Jacobs, W.W. Jia, S. Jin, Y. Joo, C.W. Joo, K.K. Kahn, J. Kaliyar, A.B. Kang, K.H. Karyan, G. Kawasaki, T. Kichimi, H. Kiesling, C. Kim, C.H. Kim, D.Y. Kim, S.H. Kim, Y.-K. Kinoshita, K. Kodyš, P. Konno, T. Korobov, A. Korpar, S. Kovalenko, E. Križan, P. Kroeger, R. Krokovny, P. Kuhr, T. Kumar, M. Kumar, R. Kumara, K. Kuzmin, A. Kwon, Y.-J. Lalwani, K. Lange, J.S. Lee, I.S. Lee, S.C. Lewis, P. Li, Y.B. Li Gioi, L. Libby, J. Lieret, K. Liventsev, D. MacQueen, C. Masuda, M. Matsuda, T. Matvienko, D. Merola, M. Metzner, F. Miyabayashi, K. Mizuk, R. Mohanty, G.B. Mrvar, M. Mussa, R. Nakao, M. Natkaniec, Z. Natochii, A. Nayak, L. Nayak, M. Nisar, N.K. Nishida, S. Nishimura, K. Ogawa, S. Ono, H. Onuki, Y. Oskin, P. Pakhlov, P. Pakhlova, G. Pardi, S. Park, H. Park, S.-H. Patra, S. Paul, S. Pedlar, T.K. Pestotnik, R. Piilonen, L.E. Podobnik, T. Prencipe, E. Prim, M.T. Purohit, M.V. Röhrken, M. Rostomyan, A. Rout, N. Russo, G. Sahoo, D. Sandilya, S. Department of Physics University of the Basque Country UPV/EHU Bilbao48080 Spain University of Bonn Bonn53115 Germany Brookhaven National Laboratory UptonNY11973 United States Budker Institute of Nuclear Physics SB RAS Novosibirsk630090 Russia Faculty of Mathematics and Physics Charles University Prague121 16 Czech Republic Chonnam National University Gwangju61186 Korea Republic of University of Cincinnati CincinnatiOH45221 United States Deutsches Elektronen–Synchrotron Hamburg22607 Germany Duke University DurhamNC27708 United States Department of Physics Fu Jen Catholic University Taipei24205 Taiwan Institute of Modern Physics Fudan University Shanghai200443 China Justus-Liebig-Universität Gießen Gießen 35392 Germany II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen37073 Germany Hayama240-0193 Japan Gyeongsang National University Jinju52828 Korea Republic of Department of Physics Institute of Natural Sciences Hanyang University Seoul04763 Korea Republic of University of Hawaii HonoluluHI96822 United States Tsukuba305-0801 Japan Tsukuba305-0801 Japan Moscow101000 Russia Forschungszentrum Jülich Jülich52425 Germany IKERBASQUE Basque Foundation for Science Bilbao48013 Spain Indian Institute of Science Education and Research Mohali SAS Nagar140306 India Indian Institute of Technology Bhubaneswar Satya Nagar 751007 India Indian Institute of Technology Guwahati Assam 781039 India Indian Institute of Technology Telangana Hyderabad502285 India Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47408 United States Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Institute of High Energy Physics Vienna1050 Austria Institute for High Energy Physics Protvino142281 Russia INFN - Sezione di Napoli Napoli80126 Italy INFN - Sezione di Torino Torino10125 Italy J. Stefan Institute Ljubljana1000 Slovenia Institut f

We report the results of the first search for the decay Bs0 → η′KS0 using 121.4 fb−1 of data collected at the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. We observe no signal and set a 90% confidence-level upper limit of 8.16 × 10−6 on the Bs0 → η′KS0 branching fraction. Copyright © 2022, The Authors. All rights reserved.

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