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Generation of terahertz transients from Co2Fe0.4Mn0.6Si-Heusler-alloy/normal-metal nanobilayers excited by femtosecond optical pulses

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Physical Review Research 2021年第4期3卷 043025-043025页

作者： Sarah Heidtfeld Roman Adam Takahide Kubota Koki Takanashi Derang Cao Carolin Schmitz-Antoniak Daniel E. Bürgler Fangzhou Wang Christian Greb Genyu Chen Ivan Komissarov Hilde Hardtdegen Martin Mikulics Roman Sobolewski Shigemasa Suga Claus M. Schneider Research Centre Jülich Peter Grünberg Institute 52425 Jülich Germany Faculty of Physics University of Duisburg-Essen 47048 Duisburg Germany Institute for Materials Research Tohoku University Sendai 980-8577 Japan Center for Spintronics Research Network Tohoku University Sendai 980-8577 Japan Center for Science and Innovation in Spintronics (Core Research Cluster) Tohoku University Sendai 980-8577 Japan College of Physics National Demonstration Center for Experimental Applied Physics Education Qingdao University Qingdao 266071 China Materials Science Graduate Program University of Rochester Rochester New York 14627 USA Laboratory for Laser Energetics University of Rochester Rochester New York 14623 USA Department of Electrical and Computer Engineering University of Rochester Rochester New York 14627 USA Belarusian State University of Informatics and Radioelectronics Minsk 220013 Belarus Research Centre Jülich Ernst Ruska Centre for Microscopy and Spectroscopy with Electrons 52425 Jülich Germany Department of Physics and Astronomy University of Rochester Rochester New York 14627 USA The Institute of Scientific and Industrial Research Osaka University Ibaraki Osaka 567-0047 Japan Department of Physics University of California Davis Davis California 95616 USA

We generated pulses of electromagnetic radiation in the terahertz (THz) frequency range by optical excitation of Co2Fe0.4Mn0.6Si (CFMS)/normal-metal (NM) bilayer structures. The CFMS is a Heusler alloy showing a band gap in one spin channel and is therefore a half metal. We compared the THz emission efficiency in a systematic manner for four different CFMS/NM bilayers, where NM was either Pt, Ta, Cr, or Al. Our measurements show that the THz intensity is highest for a Pt capping. We also demonstrate the tunability of the THz amplitude by varying the magnetic field for all four bilayers. We attribute the THz generation to the inverse spin Hall effect. In order to investigate the role of the interface in THz generation, we measured the spin mixing conductance for each CFMS/NM bilayer using a ferromagnetic resonance method. We found that the spin-orbit coupling cannot completely describe the THz generation in the bilayers and that the spin transmission efficiency of the CFMS/NM interface and the spin diffusion length, as well as the oxidation of the NM layer, play crucial roles in the THz emission process.

关键词： Inverse spin Hall effect Magnetism Spin injection Spin pumping Spintronics Ferromagnetic resonance Terahertz time-domain spectroscopy

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Precision measurements of muonium and muonic helium hyperfine structure at J-PARC

arXiv

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arXiv 2025年

作者： Strasser, Patrick Abe, Mitsushi Asai, Kanta Fukumura, Seiso Fushihara, Mahiro Goto, Yu Ino, Takashi Iwai, Ryoto Kanda, Sohtaro Kawamura, Shiori Kitaguchi, Masaaki Nishimura, Shoichiro Oku, Takayuki Okudaira, Takuya Powell, Adam Sasaki, Ken-Ichi Shimizu, Hirohiko M. Shimomura, Koichiro Tada, Hiroki Torii, Hiroyuki A. Yamanaka, Takashi Yamazaki, Takayuki 1-1 Oho Ibaraki Tsukuba305-0801 Japan Materials and Life Science Division J-PARC Center 2-4 Shirakata Tokai-mura Naka-gun Ibaraki319-1195 Japan Materials Structure Science Program Graduate Institute for Advanced Studies SOKENDAI 1-1 Oho Ibaraki Tsukuba305-0801 Japan 1-1 Oho Ibaraki Tsukuba305-0801 Japan Graduate School of Science Nagoya University Furo-cho Chikusa-ku Aichi Nagoya464-8601 Japan Department of Physics Niigata University 8050 Ikarashi 2-no-cho Nishi-ku Niigata-shi Niigata950-2181 Japan Facility for Rare Isotope Beams Michigan State University 640 South Shaw Lane East LansingMI48824 United States Kobayashi-Maskawa Institute Nagoya University Furo-cho Chikusa-ku Aichi Nagoya464-8601 Japan 2-4 Shirakata Tokai-mura Naka-gun Ibaraki319-1195 Japan Graduate School of Science and Engineering Ibaraki University 2-1-1 Bunkyo Ibaraki Mito310-8512 Japan Department of Physics and Astronomy University of Calgary 2500 University Drive NW CalgaryABT2N 1N4 Canada School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Faculty of Arts and Science Kyushu University 744 Motooka Nishi Fukuoka819-0395 Japan

At the J-PARC Muon Science Facility (MUSE), the MuSEUM collaboration is now performing new precision measurements of the ground state hyperfine structure (HFS) of both muonium and muonic helium atoms. High-precision measurements of the muonium ground-state HFS are recognized as one of the most sensitive tools for testing bound-state quantum electrodynamics theory to precisely probe the standard model and determine fundamental constants of the positive muon magnetic moment and mass. The same technique can also be employed to measure muonic helium HFS, obtain the negative muon magnetic moment and mass, and test and improve the theory of the three-body atomic system. Measurements at zero magnetic field have already yielded more accurate results than previous experiments for both muonium and muonic helium atoms. High-field measurements are now ready to start collecting data using the world’s most intense pulsed muon beam at the MUSE H-line. We aim to improve the precision of previous measurements ten times for muonium and a hundred times or more for muonic helium. We review all the key developments for these new measurements, focusing on the high-field experiment, and report the latest results and prospects. Copyright © 2025, The Authors. All rights reserved.

关键词： Microwave spectroscopy

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A light in the dark: searching for electromagnetic counterparts to black hole-black hole mergers in LIGO/Virgo O3 with the Zwicky Transient Facility

arXiv

引用

arXiv 2022年

作者： Graham, Matthew J. McKernan, Barry Ford, K.E. Saavik Stern, Daniel Djorgovski, S.G. Coughlin, Michael Burdge, Kevin B. Bellm, Eric C. Helou, George Mahabal, Ashish A. Masci, Frank J. Purdum, Josiah Rosnet, Philippe Rusholme, Ben California Institute of Technology 1200 E. California Blvd PasadenaCA91125 United States Department of Science CUNY Borough of Manhattan Community College 199 Chambers Street New YorkNY10007 United States Department of Astrophysics American Museum of Natural History Central Park West New YorkNY10028 United States Physics Program CUNY Graduate Center 365 5th Avenue New YorkNY10016 United States Center for Computational Astrophysics Flatiron Institute New YorkNY10010 United States Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive PasadenaCA91109 United States School of Physics and Astronomy University of Minnesota MinneapolisMN55455 United States Department of Physics Massachusetts Institute of Technology CambridgeMA02139 United States Kavli Institute for Astrophysics and Space Research Massachusetts Institute of Technology CambridgeMA02139 United States DIRAC Institute Department of Astronomy University of Washington 3910 15th Avenue NE SeattleWA98195 United States IPAC California Institute of Technology 1200 E. California Blvd PasadenaCA91125 United States Division of Physics Mathematics and Astronomy California Institute of Technology PasadenaCA91125 United States Center for Data Driven Discovery California Institute of Technology PasadenaCA91125 United States Caltech Optical Observatories California Institute of Technology PasadenaCA91125 United States Université Clermont Auvergne CNRS IN2P3 LPC Clermont-FerrandF-63000 France

The accretion disks of active galactic nuclei (AGN) are promising locations for the merger of compact objects detected by gravitational wave (GW) observatories. Embedded within a baryon-rich, high density environment, mergers within AGN are the only GW channel where an electromagnetic (EM) counterpart must occur (whether detectable or not). Considering AGN with unusual flaring activity observed by the Zwicky Transient Facility (ZTF), we describe a search for candidate EM counterparts to binary black hole (BBH) mergers detected by LIGO/Virgo in O3. After removing probable false positives, we find nine candidate counterparts to BBH mergers during O3 (seven in O3a, two in O3b) with a p-value of 0.0019. Based on ZTF sky coverage, AGN geometry, and merger geometry, we expect ≈ 3(NBBH/83)(fAGN/0.5) potentially detectable EM counterparts from O3, where NBBH is the total number of observed BBH mergers and fAGN is the fraction originating in AGN. Further modeling of breakout and flaring phenomena in AGN disks is required to reduce our false positive rate. Two of the events are also associated with mergers with total masses > 100M☉, which is the expected rate for O3 if hierarchical (large mass) mergers occur in the AGN channel. Candidate EM counterparts in future GW observing runs can be better constrained by coverage of the Southern sky as well as spectral monitoring of unusual AGN flaring events in LIGO/Virgo alert volumes. A future set of reliable AGN EM counterparts to BBH mergers will yield an independent means of measuring cosmic expansion (H0) as a function of redshift. © 2022, CC BY.

关键词： Gravity waves

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Kinetic Theory of Spin Diffusion and Superdiffusion in XXZ Spin Chains

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Physical Review Letters 2019年第12期122卷 127202-127202页

作者： Sarang Gopalakrishnan Romain Vasseur Department of Physics and Astronomy CUNY College of Staten Island Staten Island New York 10314 Physics Program and Initiative for the Theoretical Sciences The Graduate Center CUNY New York New York 10016 USA Department of Physics University of Massachusetts Amherst Massachusetts 01003 USA

We address the nature of spin transport in the integrable XXZ spin chain, focusing on the isotropic Heisenberg limit. We calculate the diffusion constant using a kinetic picture based on generalized hydrodynamics combined with Gaussian fluctuations: we find that it diverges, and show that a self-consistent treatment of this divergence gives superdiffusion, with an effective time-dependent diffusion constant that scales as D(t)∼t1/3. This exponent had previously been observed in large-scale numerical simulations, but had not been theoretically explained. We briefly discuss XXZ models with easy-axis anisotropy Δ>1. Our method gives closed-form expressions for the diffusion constant D in the infinite-temperature limit for all Δ>1. We find that D saturates at large anisotropy, and diverges as the Heisenberg limit is approached, as D∼(Δ−1)−1/2.

关键词： Quantum transport Spin diffusion Spin Integrable systems Quantum spin chains Spin chains

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Updated Measurements of [O III] 88μm, [C II] 158μm, and Dust Continuum Emission from a z=7.2 Galaxy

arXiv

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arXiv 2023年

作者： Ren, Yi W. Fudamoto, Yoshinobu Inoue, Akio K. Sugahara, Yuma Tokuoka, Tsuyoshi Tamura, Yoichi Matsuo, Hiroshi Kohno, Kotaro Umehata, Hideki Hashimoto, Takuya Bouwens, Rychard J. Smit, Renske Kashikawa, Nobunari Okamoto, Takashi Shibuya, Takatoshi Shimizu, Ikkoh Department of Physics Graduate School of Advanced Science and Engineering Faculty of Science and Engineering Waseda University 3-4-1 Okubo Shinjuku Tokyo169-8555 Japan Waseda Research Institute of Science and Engineering Faculty of Science and Engineering Waseda University 3-4-1 Okubo Shinjuku Tokyo169-8555 Japan National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Department of Physics Graduate School of Science Nagoya University Furocho Chikusa Nagoya464-8602 Japan Institute of Astronomy Graduate School of Science The University of Tokyo 2-21-1 Osawa Mitaka Tokyo181-0015 Japan Research Center for the Early Universe Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Institute for Advanced Research Nagoya University Furocho Chikusa Nagoya464-8602 Japan Faculty of Pure and Applied Sciences University of Tsukuba Tsukuba Ibaraki305-8571 Japan Leiden Observatory Leiden University LeidenNL-2300 RA Netherlands Astrophysics Research Institute Liverpool John Moores University 146 Brownlow Hill LiverpoolL3 5RF United Kingdom Department of Astronomy School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Faculty of Science Hokkaido University N10 W8 Kitaku Sapporo060-0810 Japan Kitami Institute of Technology 165 Koen-cho Kitami Hokkaido090-8507 Japan Shikoku Gakuin University 3-2-1 Bunkyocho Zentsuji Kagawa765-8505 Japan

We present updated measurements of the [O III] 88 μm, [C II] 158 μm, and dust continuum emission from a star-forming galaxy at z = 7.212, SXDF-NB1006-2, by utilizing Atacama Large Millimeter/submillimeter Array (ALMA) archival data sets analysed in previous studies and data sets that have not been analysed before. The follow-up ALMA observations with higher angular resolution and sensitivity reveal a clumpy structure of the [O III] emission on a scale of 0.32–0.85 kpc. We also combined all the ALMA [O III] ([C II]) data sets and updated the [O III] ([C II]) detection to 5.9σ (3.6σ–4.5σ). The non-detection of [C II] with data from the REBELS large program implies the incompleteness of spectral-scan surveys using [C II] to detect galaxies with high star formation rates (SFRs) but marginal [C II] emission at high-z. The dust continuum at 90 and 160 μm remains undetected, indicating little dust content of 6 M☉ (3σ), and we obtained a more stringent constraint on the total infrared luminosity. We updated the [O III]/[C II] luminosity ratios to 10.2 ± 4.7 (6.1 ± 3.5) and 20 ± 12 (9.6 ± 6.1) for the 4.5σ and 3.6σ [C II] detections, respectively, where the ratios in the parentheses are corrected for the surface brightness dimming effect on the extended [C II] emission. We also found a strong [C II] deficit (0.6–1.3 dex) between SXDF-NB1006-2 and the mean L[C II]−SFR relation of galaxies at 0 © 2023, CC BY.

关键词： Dust

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MAGIC detection of GRB 201216C at z = 1.1

arXiv

引用

arXiv 2023年

作者： Abe, H. Abe, S. Acciari, V.A. Agudo, I. Aniello, T. Ansoldi, S. Antonelli, L.A. Engels, A. Arbet Arcaro, C. Artero, M. Asano, K. Baack, D. Babić, A. Baquero, A. de Almeida, U. Barres Barrio, J.A. Batković, I. Baxter, J. González, J. Becerra Bednarek, W. Bernardini, E. Bernete, J. Berti, A. Besenrieder, J. Bigongiari, C. Biland, A. Blanch, O. Bonnoli, G. Bošnjak, Ž. Burelli, I. Busetto, G. Campoy-Ordaz, A. Carosi, A. Carosi, R. Carretero-Castrillo, M. Castro-Tirado, A.J. Ceribella, G. Chai, Y. Cifuentes, A. Cikota, S. Colombo, E. Contreras, J.L. Cortina, J. Covino, S. D’Amico, G. D’Elia, V. Da Vela, P. Dazzi, F. De Angelis, A. De Lotto, B. Del Popolo, A. Delfino, M. Delgado, J. Mendez, C. Delgado Depaoli, D. Di Pierro, F. Di Venere, L. Prester, D. Dominis Donini, A. Dorner, D. Doro, M. Elsaesser, D. Emery, G. Escudero, J. Fariña, L. Fattorini, A. Foffano, L. Font, L. Fukami, S. Fukazawa, Y. López, R.J. García Garczarczyk, M. Gasparyan, S. Gaug, M. Paiva, J.G. Giesbrecht Giglietto, N. Giordano, F. Gliwny, P. Godinović, N. Grau, R. Green, D. Green, J.G. Hadasch, D. Hahn, A. Hassan, T. Heckmann, L. Herrera, J. Hrupec, D. Hütten, M. Imazawa, R. Inada, T. Iotov, R. Ishio, K. Martínez, I. Jiménez Jormanainen, J. Kerszberg, D. Kluge, G.W. Kobayashi, Y. Kouch, P.M. Kubo, H. Kushida, J. Lezáun, M. Láinez Lamastra, A. Leone, F. Lindfors, E. Linhoff, L. Lombardi, S. Longo, F. López-Coto, R. López-Moya, M. López-Oramas, A. Loporchio, S. Lorini, A. Lyard, E. de Oliveira Fraga, B. Machado Majumdar, P. Makariev, M. Maneva, G. Mang, N. Manganaro, M. Mangano, S. Mannheim, K. Mariotti, M. Martínez, M. Mas-Aguilar, A. Mazin, D. Menchiari, S. Mender, S. Mićanović, S. Miceli, D. Miener, T. Miranda, J.M. Mirzoyan, R. González, M. Molero Molina, E. Mondal, H.A. Moralejo, A. Morcuende, D. Nanci, C. Nava, L. Neustroev, V. Rosillo, M. Nievas Nigro, C. Nikolić, L. Nilsson, K. Nishijima, K. Ekoume, T. Njoh Noda, K. Nozaki, S. Ohtani, Y. Okumura, A. Otero-Santos, J. Paiano, S. The University of Tokyo Chiba Kashiwa277-8582 Japan Instituto de Astrofísica de Canarias Dpto. de Astrofísica Universidad de La Laguna La Laguna TenerifeE-38200 Spain Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomía s/n Granada18008 Spain RomeI-00136 Italy Università di Udine INFN Trieste UdineI-33100 Italy Max-Planck-Institut für Physik MünchenD-80805 Germany Università di Padova INFN PadovaI-35131 Italy Bellaterra BarcelonaE-08193 Spain Technische Universität Dortmund DortmundD-44221 Germany Zagreb10000 Croatia IPARCOS Institute EMFTEL Department Universidad Complutense de Madrid MadridE-28040 Spain URCA RJ Rio de Janeiro22290-180 Brazil University of Lodz Faculty of Physics and Applied Informatics Department of Astrophysics Lodz90-236 Poland Centro de Investigaciones Energéticas Medioambientales y Tecnológicas MadridE-28040 Spain ETH Zürich ZürichCH-8093 Switzerland Departament de Física CERES-IEEC Universitat Autònoma de Barcelona BellaterraE-08193 Spain Università di Pisa INFN Pisa PisaI-56126 Italy Universitat de Barcelona ICCUB IEEC-UB BarcelonaE-08028 Spain Department for Physics and Technology University of Bergen Norway INFN MAGIC Group INFN Sezione di Catania Dipartimento di Fisica e Astronomia University of Catania CataniaI-95123 Italy INFN MAGIC Group INFN Sezione di Torino and Università degli Studi di Torino TorinoI-10125 Italy INFN MAGIC Group INFN Sezione di Bari Dipartimento Interateneo di Fisica dell’Università e del Politecnico di Bari BariI-70125 Italy Croatian MAGIC Group University of Rijeka Faculty of Physics Rijeka51000 Croatia Universität Würzburg WürzburgD-97074 Germany University of Geneva Chemin d’Ecogia 16 VersoixCH-1290 Switzerland Japanese MAGIC Group: Physics Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima739-8526 Japan ZeuthenD-15738 Germany Armenian MAGIC Group: ICRANet-Armenia Yerevan0019 Armenia

Gamma-ray bursts (GRBs) are explosive transient events occurring at cosmological distances, releasing a large amount of energy as electromagnetic radiation over several energy bands. We report the detection of the long GRB 201216C by the MAGIC telescopes. The source is located at z = 1.1 and thus it is the farthest one detected at very high energies. The emission above 70 GeV of GRB 201216C is modelled together with multi-wavelength data within a synchrotron and synchrotron-self Compton (SSC) scenario. We find that SSC can explain the broadband data well from the optical to the very-high-energy band. For the late-time radio data, a different component is needed to account for the observed emission. Differently from previous GRBs detected in the very-high-energy range, the model for GRB 201216C strongly favors a wind-like medium. The model parameters have values similar to those found in past studies of the afterglows of GRBs detected up to GeV energies. Copyright © 2023, The Authors. All rights reserved.

关键词： Stars

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Topological Data Analysis of Black Hole Images

arXiv

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arXiv 2022年

作者： Christian, Pierre Chan, Chi-Kwan Hsu, Anthony Özel, Feryal Psaltis, Dimitrios Natarajan, Iniyan Physics Department Fairfield University 1073 N Benson Rd FairfieldCT06824 United States Department of Astronomy University of Arizona 933 North Cherry Avenue 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 Computer Science University of Arizona 1040 4th St TucsonAZ85721 United States Wits Centre for Astrophysics University of the Witwatersrand 1 Jan Smuts Avenue Braamfontein Johannesburg2050 South Africa South African Radio Astronomy Observatory Observatory Cape Town7925 South Africa

Features such as photon rings, jets, or hot spots can leave particular topological signatures in a black hole image. As such, topological data analysis can be used to characterize images resulting from high resolution observations (synthetic or real) of black holes in the electromagnetic sector. We demonstrate that persistent homology allows for this characterization to be made automatically by counting the number of connected components and one-dimensional holes. Further, persistent homology also allows for the distance between connected components or diameter of holes to be extracted from the image. In order to apply persistent homology on synthetic black hole images, we also introduce metronization, a new algorithm to prepare black hole images into a form that is suitable for topological analysis. Copyright © 2022, The Authors. All rights reserved.

关键词： Black holes

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First test of lepton flavor universality in the charmed baryon decays Ωc0→Ω−ℓ+νℓ using data of the Belle experiment

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Physical Review D 2022年第9期105卷 L091101-L091101页

作者： Y. B. Li C. P. Shen I. Adachi H. Aihara S. Al Said D. M. Asner H. Atmacan T. Aushev R. Ayad V. Babu S. Bahinipati P. Behera K. Belous J. Bennett F. Bernlochner M. Bessner B. Bhuyan T. Bilka A. Bobrov D. Bodrov J. Borah A. Bozek M. Bračko P. Branchini T. E. Browder A. Budano M. Campajola D. Červenkov M.-C. Chang P. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin H. E. Cho K. Cho S.-J. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe N. Dash G. De Nardo G. De Pietro R. Dhamija F. Di Capua J. Dingfelder Z. Doležal T. V. Dong T. Ferber D. Ferlewicz B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Giri P. Goldenzweig B. Golob E. Graziani K. Gudkova C. Hadjivasiliou T. Hara K. Hayasaka H. Hayashii M. T. Hedges W.-S. Hou K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs E.-J. Jang S. Jia Y. Jin K. K. Joo J. Kahn K. H. Kang T. Kawasaki H. Kichimi C. Kiesling C. H. Kim D. Y. Kim K.-H. Kim K. T. Kim Y.-K. Kim K. Kinoshita P. Kodyš T. Konno A. Korobov S. Korpar E. Kovalenko P. Križan R. Kroeger P. Krokovny M. Kumar R. Kumar K. Kumara A. Kuzmin Y.-J. Kwon K. Lalwani T. Lam M. Laurenza S. C. Lee J. Li L. K. Li Y. Li L. Li Gioi J. Libby K. Lieret D. Liventsev A. Martini M. Masuda D. Matvienko S. K. Maurya M. Merola K. Miyabayashi R. Mizuk G. B. Mohanty M. Nakao D. Narwal A. Natochii L. Nayak M. Nayak N. K. Nisar S. Nishida K. Ogawa S. Ogawa H. Ono P. Oskin P. Pakhlov G. Pakhlova T. Pang S. Pardi S.-H. Park S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik E. Prencipe M. T. Prim M. Röhrken A. Rostomyan N. Rout G. Russo D. Sahoo S. Sandilya A. Sangal L. Santelj V. Savinov G. Schnell J. Schueler C. Schwanda Y. Seino K. Senyo M. E. Sevior M. Shapkin C. Sharma V. Shebalin J.-G. Shiu B. Shwartz J. B. Singh A. Sokolov E. Solovieva M. Starič Z. S. Stottler M. Sumihama T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida F. Tenchini M. Uchida T. Uglov Y. Unno K. Uno S. Uno P. Urquijo S. E. Vahsen R. Van Tonder G. Varner A. Vinokurova E. Waheed D. Wang E. Wang M.-Z. Wang S. Watanuki E. Won Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics Fudan University Shanghai 200443 High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Department of Physics University of Tokyo Tokyo 113-0033 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Department of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Brookhaven National Laboratory Upton New York 11973 University of Cincinnati Cincinnati Ohio 45221 National Research University Higher School of Economics Moscow 101000 Deutsches Elektronen–Synchrotron 22607 Hamburg Indian Institute of Technology Bhubaneswar Satya Nagar 751007 Indian Institute of Technology Madras Chennai 600036 Institute for High Energy Physics Protvino 142281 University of Mississippi University Mississippi 38677 University of Bonn 53115 Bonn University of Hawaii Honolulu Hawaii 96822 Indian Institute of Technology Guwahati Assam 781039 Faculty of Mathematics and Physics Charles University 121 16 Prague Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 Faculty of Chemistry and Chemical Engineering University of Maribor 2000 Maribor J. Stefan Institute 1000 Ljubljana INFN—Sezione di Roma Tre I-00146 Roma INFN—Sezione di Napoli I-80126 Napoli Università di Napoli Federico II I-80126 Napoli Department of Physics Fu Jen Catholic University Taipei 24205 Department of Physics National Taiwan University Taipei 10617 Max-Planck-Institut für Physik 80805 München National Central University Chung-li 32054 Department of Physics and Institute of Natural Sciences Hanyang University Seoul 04763 Korea Institute of Science and Technology Information Daejeon 34141 Yonsei University Seoul 0372

We present the first observation of the Ωc0→Ω−μ+νμ decay and present measurements of the branching fraction ratios of the Ωc0→Ω−ℓ+νℓ decays compared to the reference mode Ωc0→Ω−π+, (ℓ=e or μ). This analysis is based on 89.5 fb−1, 711 fb−1, and 121.1 fb−1 data samples collected with the Belle detector at the KEKB asymmetric-energy e+e− collider at the center-of-mass energies of 10.52 GeV, 10.58 GeV, and 10.86 GeV, respectively. The Ωc0 signal yields are extracted by fitting MΩℓ and MΩπ spectra. The branching fraction ratios B(Ωc0→Ω−e+νe)/B(Ωc0→Ω−π+) and B(Ωc0→Ω−μ+νμ)/B(Ωc0→Ω−π+) are measured to be 1.98±0.13(stat)±0.08(syst) and 1.94±0.18(stat)±0.10(syst), respectively. The ratio of B(Ωc0→Ω−e+νe)/B(Ωc0→Ω−μ+νμ) is measured to be 1.02±0.10(stat)±0.02(syst), which is consistent with the expectation of lepton flavor universality.

关键词： Branching fraction Leptonic, semileptonic & radiative decays Charmed baryons Lepton colliders

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Search for the Optical Counterpart of Einstein Probe Discovered Fast X-ray Transients from Lulin Observatory

arXiv

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arXiv 2025年

作者： Aryan, Amar Chen, Ting-Wan Yang, Sheng Gillanders, James H. Kong, Albert K.H. Smartt, S.J. Stevance, Heloise F. Yang, Yi-Jung Aamer, Aysha Gupta, Rahul Fan, Lele Hou, Wei-Jie Hsiao, Hsiang-Yao Kumar, Amit Lai, Cheng-Han Lee, Meng-Han Lee, Yu-Hsing Lin, Hung-Chin Lin, Chi-Sheng Ngeow, Chow-Choong Nicholl, Matt Pan, Yen-Chen Pandey, Shashi Bhushan Sankar, Aiswarya K. Srivastav, Shubham Sun, Guanghui Wang, Ze-Ning Graduate Institute of Astronomy National Central University 300 Jhongda Road Jhongli32001 Taiwan Henan Academy of Sciences Henan Zhengzhou450046 China Astrophysics sub-Department Department of Physics University of Oxford Keble Road OxfordOX1 3RH United Kingdom Institute of Astronomy National Tsing Hua University Hsinchu300044 Taiwan Department of Physics University of Oxford Keble Road OxfordOX1 3RH United Kingdom Astrophysics Research Centre School of Mathematics and Physics Queens University Belfast BelfastBT7 1NN United Kingdom Astrophysics Science Division NASA Goddard Space Flight Center Mail Code 661 GreenbeltMD20771 United States NASA Postdoctoral Program Manora Peak Nainital263002 India Manora Peak Uttarakhand Nainital263001 India

The launch of the Einstein Probe (EP) mission has revolutionized the detection and follow-up observations of fast X-ray transients (FXTs) by providing prompt and timely access to their precise localizations. In the first year of its operation, the EP mission reports the discovery of 72 high signal-to-noise FXTs. Subjected to the visibility in the sky and weather conditions, we search for the optical counterparts of 42 EP-discovered FXTs from the Lulin observatory. We successfully detect the optical counterparts of 12 FXTs, and five of those are first discovered by us from the Lulin observatory. We find that the optical counterparts are generally faint (r > 20 mag) and decline rapidly (> 0.5 mag per day). We also find that 11 out of 42 FXTs had shown direct evidence of their association with Gamma-Ray Bursts (GRBs) through significant temporal and spatial overlapping. Furthermore, the luminosities and redshifts of FXTs with confirm optical counterparts in our observations are fully consistent with the faintest end of the GRB population. However, the non-detection of any associated optical counterpart with a significant fraction of FXTs suggests that EP FXTs are likely a subset of so-called ‘Dark’ FXTs, similar to ‘Dark’ GRBs. Additionally, the luminosities of two FXTs were also consistent with jetted tidal disruption events (TDEs). However, their luminosities differ significantly from those of typical supernova shock breakout or kilonova emissions. Thus, we conclude that a significant fraction of EP-discovered FXTs are associated with events having relativistic jets;either a GRB or a jetted TDE. © 2025, CC BY.

关键词： Solar wind

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

arXiv

引用

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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