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Magnetic Control of Soft Chiral Phonons in PbTe

Physical Review Letters 2022年第7期128卷 075901-075901页

作者： Andrey Baydin Felix G. G. Hernandez Martin Rodriguez-Vega Anderson K. Okazaki Fuyang Tay G. Timothy Noe, II Ikufumi Katayama Jun Takeda Hiroyuki Nojiri Paulo H. O. Rappl Eduardo Abramof Gregory A. Fiete Junichiro Kono Department of Electrical and Computer Engineering Rice University Houston Texas 77005 USA Smalley-Curl Institute Rice University Houston Texas 77005 USA Instituto de Física Universidade de São Paulo São Paulo São Paulo 05508-090 Brazil Theoretical Division Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Laboratório Associado de Sensores e Materiais Instituto Nacional de Pesquisas Espaciais São José dos Campos São Paulo 12201-970 Brazil Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston Texas 77005 USA Department of Physics Graduate School of Engineering Science Yokohama National University Yokohama 240-8501 Japan Institute for Materials Research Tohoku University Sendai 980-8577 Japan Department of Physics Northeastern University Boston Massachusetts 02115 USA Department of Physics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Department of Physics and Astronomy Rice University Houston Texas 77005 USA Department of Material Science and NanoEngineering Rice University Houston Texas 77005 USA

PbTe crystals have a soft transverse optical phonon mode in the terahertz frequency range, which is known to efficiently decay into heat-carrying acoustic phonons, resulting in anomalously low thermal conductivity. Here, we studied this phonon via polarization-dependent terahertz spectroscopy. We observed softening of this mode with decreasing temperature, indicative of incipient ferroelectricity, which we explain through a model including strong anharmonicity with a quartic displacement term. In magnetic fields up to 25 T, the phonon mode splits into two modes with opposite handedness, exhibiting circular dichroism. Their frequencies display Zeeman splitting together with an overall diamagnetic shift with increasing magnetic field. Using a group-theoretical approach, we demonstrate that these observations are the result of magnetic field-induced morphic changes in the crystal symmetries through the Lorentz force exerted on the lattice ions. Thus, our Letter reveals a novel process of controlling phonon properties in a soft ionic lattice by a strong magnetic field.

关键词： Chirality Diamagnetism Magneto-dielectric effect Optical phonons Thermal conductivity Zeeman effect Terahertz time-domain spectroscopy

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Search for the doubly charmed baryon ?cc+

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science China(physics,Mechanics & Astronomy) 2021年第10期Mechanics & Astronomy) .卷 6-17页

作者： R. Aaij C. Abellán Beteta T. Ackernley B. Adeva M. Adinolfi H. Afsharnia C. A. Aidala S. Aiola Z. Ajaltouni S. Akar J. Albrecht F. Alessio M. Alexander A. Alfonso Albero Z. Aliouche G. Alkhazov P. Alvarez Cartelle S. Amato Y. Amhis L. An L. Anderlini A. Andreianov M. Andreotti F. Archilli A. Artamonov M. Artuso K. Arzymatov E. Aslanides M. Atzeni B. Audurier S. Bachmann M. Bachmayer J. J. Back P. Baladron Rodriguez V. Balagura W. Baldini J. Baptista Leite R. J. Barlow S. Barsuk W. Barter M. Bartolini F. Baryshnikov J. M. Basels G. Bassi B. Batsukh A. Battig A. Bay M. Becker F. Bedeschi I. Bediaga A. Beiter V. Belavin S. Belin V. Bellee K. Belous I. Belov I. Belyaev G. Bencivenni E. Ben-Haim A. Berezhnoy R. Bernet D. Berninghoff H. C. Bernstein C. Bertella A. Bertolin C. Betancourt F. Betti I. Bezshyiko S. Bhasin J. Bhom L. Bian M. S. Bieker S. Bifani P. Billoir M. Birch F. C. R. Bishop A. Bitadze A. Bizzeti M. Bj?rn M. P. Blago T. Blake F. Blanc S. Blusk D. Bobulska J. A. Boelhauve O. Boente Garcia T. Boettcher A. Boldyrev A. Bondar N. Bondar S. Borghi M. Borisyak M. Borsato J. T. Borsuk S. A. Bouchiba T. J. V. Bowcock A. Boyer C. Bozzi M. J. Bradley S. Braun A. Brea Rodriguez M. Brodski J. Brodzicka A. Brossa Gonzalo D. Brundu A. Buonaura C. Burr A. Bursche A. Butkevich J. S. Butter J. Buytaert W. Byczynski S. Cadeddu H. Cai R. Calabrese L. Calefice L. Calero Diaz S. Cali R. Calladine M. Calvi M. Calvo Gomez P. Camargo Magalhaes P. Campana A. F. Campoverde Quezada S. Capelli L. Capriotti A. Carbone G. Carboni R. Cardinale A. Cardini I. Carli P. Carniti L. Carus K. Carvalho Akiba A. Casais Vidal G. Casse M. Cattaneo G. Cavallero S. Celani J. Cerasoli A. J. Chadwick M. G. Chapman M. Charles P. Charpentier G. Chatzikonstantinidis C. A. Chavez Barajas M. Chefdeville C. Chen S. Chen A. Chernov V. Chobanova S. Cholak M. Chrzaszcz A. Chubykin V. Chulikov P. Ciambrone M. F. Cicala X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Clif J. Closier J. L. Cobbledick V. Coco J. A. B. Coelho J. Cogan E. Cogneras L. Nikhef National Institute for Subatomic Physics Physik-Institut Universit?t Zürich Oliver Lodge Laboratory University of Liverpool Instituto Galego de Física de Altas Enerxías (IGFAE) Universidade de Santiago de Compostela H.H. Wills Physics Laboratory University of Bristol Université Clermont Auvergne University of Michigan Ann Arbor United States INFN Sezione di Milano University of Cincinnati Fakult?t Physik Technische Universit?t Dortmund European Organization for Nuclear Research (CERN) School of Physics and Astronomy University of Glasgow ICCUB Universitat de Barcelona Department of Physics and Astronomy University of Manchester Petersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI) Cavendish Laboratory University of Cambridge Universidade Federal do Rio de Janeiro (UFRJ) Université Paris-Saclay INFN Sezione di Firenze INFN Sezione di Ferrara Physikalisches Institut Ruprecht-Karls-Universit?t Heidelberg Institute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI) Syracuse University Yandex School of Data Analysis Aix Marseille Univ Laboratoire Leprince-Ringuet CNRS/IN2P3 Ecole Polytechnique Institut Polytechnique de Paris Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) Department of Physics University of Warwick Centro Brasileiro de Pesquisas Físicas (CBPF) Imperial College London INFN Sezione di Genova National University of Science and Technology “MISIS” I. Physikalisches Institut RWTH Aachen University INFN Sezione di Pisa INFN Sezione di Cagliari Institute of Nuclear Physics Moscow State University (SINP MSU) Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI) INFN Laboratori Nazionali di Frascati LPNHE Sorbonne Université Paris Diderot Sorbonne Paris Cité Universita degli Studi di Padova Universita e INFN Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences School of Physics and Technology Wuhan University University of Birmingham Università di Modena e Reggio Emilia Department of Physics U

A search for the doubly charmed baryon ?cc+with the decay mode ?cc+→Ξc+K-π+is performed using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the LHCb experiment from 2016 to 2018, corresponding to an integrated luminosity of 5.4 fb-1. No significant signal is observed within the invariant mass range of 3.6 to 4.0 GeV/c2. Upper limits are set on the ratio R of the production cross-section times the total branching fraction of the ?cc+→Ξc+K-π+decay with respect to the Ξcc++→Λc+K-π+π+decay. Upper limits at 95% credibility level for R in the range 0.005 to 0.11 are obtained for diferent hypotheses on the ?cc+mass and lifetime in the rapidity range from 2.0 to 4.5 and transverse momentum range from 4 to 15 GeV/c.

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Effect of proton irradiation on ferrite microstructure in aged 308L stainless steel

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Journal of Materials science & Technology 2025年

作者： Xiaofeng Yang Yuanfei Li Jianchao Peng Xue Liang Wenqing Liu Xiangbing Liu Hefei Huang Institute of Materials School of Materials Science and Engineering Shanghai University Shanghai 200444 China Suzhou Nuclear Power Research Institute Suzhou 215004 China Key Laboratory of Microstructure Shanghai University Shanghai 200444 China National Key Laboratory of Thorium Energy Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China

To investigate the microscopic changes in the ferrite phase of the 308L stainless steel matrix under service conditions, the welding material was first aged at 400°C for 5000 h, followed by 240 keV proton irradiation at the same temperature. Transmission electron microscopy (TEM) and atom probe tomography (APT) were used to characterize the ferrite phase as a function of irradiation damage and depth. The results indicate that, after thermal aging, the G phase forms within the ferrite phase and spinodal decomposition occurs simultaneously. Irradiation leads to an increase in the size of the G phase and the formation of NiSi clusters due to irradiation-induced segregation. The size and number density of NiSi clusters increase with increasing irradiation dose. However, no significant changes in the degree of spinodal decomposition are observed.

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Enhancing the Gamma Radiation Shielding Performance: The Impact of Bi 2 O 3 and MgO Nanoparticles on PMMA

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Radiation physics and Chemistry 2025年

作者： Aml Almutery Wan Nordiana Rahman Faizal Mohamed Chia Chin Hua Khairunisak Abdul Razak Raizulnasuha Ab Rashid U. Rilwan M.I. Sayyed Yasser Maghrbi Department of Applied Physics Faculty of Science and Technology Universiti Kebangsaan Malaysia 43600 UKM Bangi Selangor Malaysia Nuclear Technology Research Centre Faculty of Science and Technology Universiti Kebangsaan Malaysia 43600 UKM Bangi Selangor Malaysia Physics Department Faculty of Science and Humanities in Ad-Dawadmi Shaqra University Shaqra 11911 Saudi Arabia School of Materials and Mineral Resources Engineering Engineering Campus Universiti Sains Malaysia 14300 Nibong Tebal Penang Malaysia Centre for Diagnostic Nuclear Imaging Universiti Putra Malaysia 43400 Serdang Selangor Malaysia Department of Physics Faculty of Natural and Applied Sciences Nigerian Army University P.O. Box 1500 Biu Borno State Nigeria Department of Physics Faculty of Sciences Isra University Amman Jordan Universite Cote d’Azur 06100 Nice France Gulf University for Science and Technology Mubarak Al-Abdullah 32093 Kuwait

This work investigated the gamma radiation shielding performance of different nano-composites (pure PMMA, PMMA doped with Bi 2 O 3 , PMMA doped with MgO, and PMMA doped with Bi 2 O 3 -MgO) using the solution casting method. The experimental linear attenuation coefficients (LACs) of the samples were determined using a sodium iodide (NaI) detector and the results were compared with Phy-X theoretical results, where better matching was observed. At 59.5 keV, the PMMA doped with Bi 2 O 3 sample had the largest LAC of 0.759 cm -1 when compared to the PMMA doped with Bi 2 O 3 -MgO sample with a LAC of 0.695 cm -1 . At the same energy (59.5 keV), the radiation protection efficiency of the PMMA doped with Bi 2 O 3 sample was 31.34%, which was far greater compared to that of the PMMA doped with Bi 2 O 3 -MgO sample, thus confirming the PMMA doped with Bi 2 O 3 sample as the optimum candidate to be applied for protection against gamma radiation.

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The physics potential of the CEPC Prepared for the US Snowmass Community Planning Exercise (Snowmass 2021)

arXiv

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arXiv 2022年

作者： Cheng, Huajie Chiu, Wen Han Fang, Yaquan Gao, Yu Gu, Jiayin Li, Gang Li, Lingfeng Li, Tianjun Liang, Zhijun Liu, Bo Liu, Jia Liu, Zhen Ruan, Manqi Shu, Jing Wang, Kechen Wang, Lian-Tao Xie, Ke-Pan Yang, Shuo Yuan, Jiarong Zhang, Kaili Zhang, Mengchao Zhang, Yang Zhuang, Xuai Department of Applied Physics Naval University of Engineering Jiefang Blvd 717 Qiaokou District Wuhan430033 China Department of Physics University of Chicago ChicagoIL60637 United States Institute of High Energy Physics University of Chinese Academy of Science Beijing100049 China Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Fudan University Shanghai200438 China Department of Physics Brown University ProvidenceRI02912 United States CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing100190 China School of Physics State Key Laboratory of Nuclear Physics and Technology Peking University Beijing100871 China School of Physics and Astronomy University of Minnesota MinneapolisMN55455 United States Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Department of Physics School of Science Wuhan University of Technology Hubei Wuhan430070 China Department of Physics and Astronomy University of Nebraska LincolnNE68588 United States Department of Physics Liaoning Normal University Dalian116029 China School of Physical Sciences University of Chinese Academy of Sciences No. 19A Yuquan Road Beijing100049 China Department of Physics Siyuan Laboratory Jinan University Guangzhou510632 China School of Physics Zhengzhou University Zhengzhou450000 China

The Circular Electron Positron Collider (CEPC) is a large-scale colliderfacility that can serve as a factory of the Higgs, Z, and W bosons and isupgradable to run at the ttbar threshold. This document describes the latestCEPC nominal operation scenario and particle yields and updates thecorresponding physics potential. A new detector concept is also brieflydescribed. This submission is for consideration by the Snowmass process. Copyright © 2022, The Authors. All rights reserved.

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Describing Migdal effects in diamond crystal with atom-centered localized Wannier functions

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Physical Review D 2020年第4期102卷 043007-043007页

作者： Zheng-Liang Liang Lin Zhang Fawei Zheng Ping Zhang College of Mathematics and Physics Beijing University of Chemical Technology Beijing 100029 China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing 100049 China Institute of Applied Physics and Computational Mathematics Beijing 100088 China School of Physics and Physical Engineering Qufu Normal University Qufu 273165 China

Recent studies have theoretically investigated the atomic excitation and ionization induced by the dark matter–nucleus scattering, and it was found that the suddenly recoiled atom is much more likely to excite or lose its electrons than expected. This phenomenon is called the “Migdal effect.” In this paper, we extend the established strategy to describe the Migdal effect in isolated atoms to the case in semiconductors under the framework of the tight-binding approximation. Since the localized aspects of electrons are respected in the form of the Wannier functions, the extension of the existing Migdal approach for isolated atoms is much more natural, while the extensive nature of electrons in solids is reflected in the hopping integrals. We take a diamond target as a concrete proof of principle for the methodology, and calculate relevant energy spectra and the projected sensitivity of such a diamond detector. It turns out that our method as a preliminary attempt is theoretically self-consistent and practically effective.

关键词： Particle dark matter Dark matter detectors Density functional calculations Wannier function methods

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Measurement of the τ lepton polarization in Z boson decays in proton-proton collisions at (Formula presented.)

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Journal of High Energy physics 2024年第1期2024卷 101页

作者： Hayrapetyan, A. Tumasyan, A. Adam, W. Andrejkovic, J.W. Bergauer, T. Chatterjee, S. Damanakis, K. Dragicevic, M. Escalante Del Valle, A. Hussain, P.S. Jeitler, M. Krammer, N. Liko, D. Mikulec, I. Schieck, J. Schöfbeck, R. Schwarz, D. Sonawane, M. Templ, S. Waltenberger, W. Wulz, C.-E. Darwish, M.R. Janssen, T. Van Mechelen, P. Bols, E.S. D’Hondt, J. Dansana, S. De Moor, A. Delcourt, M. El Faham, H. Lowette, S. Makarenko, I. Müller, D. Sahasransu, A.R. Tavernier, S. Tytgat, M. Van Putte, S. Vannerom, D. Clerbaux, B. De Lentdecker, G. Favart, L. Hohov, D. Jaramillo, J. Khalilzadeh, A. Lee, K. Mahdavikhorrami, M. Malara, A. Paredes, S. Pétré, L. Postiau, N. Thomas, L. Vanden Bemden, M. Vander Velde, C. Vanlaer, P. De Coen, M. Dobur, D. Hong, Y. Knolle, J. Lambrecht, L. Mestdach, G. Rendón, C. Samalan, A. Skovpen, K. Van Den Bossche, N. Wezenbeek, L. Benecke, A. Bruno, G. Caputo, C. Delaere, C. Donertas, I.S. Giammanco, A. Jaffel, K. Jain, Sa. Lemaitre, V. Lidrych, J. Mastrapasqua, P. Mondal, K. Tran, T.T. Wertz, S. Alves, G.A. Coelho, E. Hensel, C. Menezes De Oliveira, T. Moraes, A. Rebello Teles, P. Soeiro, M. Aldá Júnior, W.L. Alves Gallo Pereira, M. Barroso Ferreira Filho, M. Brandao Malbouisson, H. Carvalho, W. Chinellato, J. Da Costa, E.M. Da Silveira, G.G. De Jesus Damiao, D. Fonseca De Souza, S. Martins, J. Mora Herrera, C. Mota Amarilo, K. Mundim, L. Nogima, H. Santoro, A. Silva Do Amaral, S.M. Sznajder, A. Thiel, M. Vilela Pereira, A. Bernardes, C.A. Calligaris, L. Fernandez Perez Tomei, T.R. Gregores, E.M. Mercadante, P.G. Novaes, S.F. Orzari, B. Padula, Sandra S. Aleksandrov, A. Antchev, G. Hadjiiska, R. Iaydjiev, P. Misheva, M. Shopova, M. Sultanov, G. Dimitrov, A. Ivanov, T. Litov, L. Pavlov, B. Petkov, P. Petrov, A. Shumka, E. Keshri, S. Thakur, S. Cheng, T. Guo, Q. Javaid, T. Mittal, M. Yuan, L. Bauer, G. Hu, Z. Yi, K. Chen, G.M. Chen, H.S. Chen, M. Iemmi, F. Jiang, C.H. Kapoor, A. Liao, H. Liu, Z.-A. Monti, F. Sharma, R. Song, J.N. Tao, J. Wang, C. Wang, J. Wang, Z. Zhang, H. Agapitos, A. Ban, Y. Lev Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Vienna Austria Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Instituto De Alta Investigación Universidad de Tarapacá Casilla 7 D Arica Chile Beihang University Beijing China Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Sun Yat-Sen University Guangzhou China University of Science and Technology of China Hefei China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) — Fudan University Shanghai China Zhejiang University Zhejiang Hangzhou China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt Center for High Energy Physics (CHEP-FU) Fayoum University El-Fayoum Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics

The polarization of τ leptons is measured using leptonic and hadronic τ lepton decays in Z → τ+ τ− events in proton-proton collisions at (Formula presented.) recorded by CMS at the CERN LHC with an integrated lum... 详细信息

The polarization of τ leptons is measured using leptonic and hadronic τ lepton decays in Z → τ⁺ τ⁻ events in proton-proton collisions at (Formula presented.) recorded by CMS at the CERN LHC with an integrated luminosity of 36.3 fb⁻¹. The measured τ⁻ lepton polarization at the Z boson mass pole is P_τ(Z) = −0.144 ± 0.006 (stat) ± 0.014 (syst) = −0.144 ± 0.015, in good agreement with the measurement of the τ lepton asymmetry parameter of A_τ = 0.1439 ± 0.0043 = − P_τ(Z) at LEP. The τ lepton polarization depends on the ratio of the vector to axial-vector couplings of the τ leptons in the neutral current expression, and thus on the effective weak mixing angle sin² θWeff , independently of the Z boson production mechanism. The obtained value sin² θWeff = 0.2319 ± 0.0008(stat) ± 0.0018(syst) = 0.2319 ± 0.0019 is in good agreement with measurements at e⁺ e⁻ colliders. [Figure not available: see fulltext.]. © 2024, The Author(s).

关键词： Hadron-Hadron Scattering Tau physics

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Spin-charge coupling and decoupling in perovskite-type iron oxides (Sr1−xBax)2/3La1/3FeO3

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Physical Review Materials 2022年第9期6卷 094401-094401页

作者： M. Onose H. Takahashi T. Saito T. Kamiyama R. Takahashi H. Wadati S. Kitao M. Seto H. Sagayama Y. Yamasaki T. Sato F. Kagawa S. Ishiwata Department of Applied Physics University of Tokyo Bunkyo-ku Tokyo 113-8656 Japan Division of Materials Physics and Center for Spintronics Research Network (CSRN) Graduate School of Engineering Science Osaka University Toyonaka Osaka 560-8531 Japan Division of Spintronics Research Network Institute for Open and Transdisciplinary Research Initiatives Osaka University Yamadaoka 2-1 Suita Osaka 565-0871 Japan Institute of Materials Structure Science (IMSS) High Energy Accelerator Research Organization (KEK) Tokai Ibaraki 319-1106 Japan The Graduate University for Advanced Studies SOKENDAI Tokai Ibaraki 319-1106 Japan Department of Material Science Graduate School of Science University of Hyogo Ako Hyogo 678-1297 Japan Institute of Laser Engineering Osaka University Suita Osaka 565-0871 Japan Institute for Integrated Radiation and Nuclear Science Kyoto University Kumatori Osaka 590-0494 Japan Institute of Materials Structure Science (IMSS) High Energy Accelerator Research Organization (KEK) Tsukuba Ibaraki 305-0801 Japan National Institute for Materials Science (NIMS) Tsukuba Ibaraki 305-0047 Japan RIKEN Center for Emergent Matter Science (CEMS) Wako Saitama 351-0198 Japan Research Center of Integrative Molecular Systems (CIMoS) Institute for Molecular Science Myodaiji Okazaki 444-8585 Japan The Graduate University for Advanced Studies SOKENDAI Myodaiji Okazaki 444-8585 Japan

The perovskite-type iron oxide Sr2/3La1/3FeO3 is known to show characteristic spin-charge ordering (SCO), where sixfold collinear spin ordering and threefold charge ordering are coupled with each other. Here, we report the discovery of a spin-charge decoupling and an antiferromagnetic (AFM) state competing with the SCO phase in perovskites (Sr1−xBax)2/3La1/3FeO3. By comprehensive measurements including neutron diffraction, Mössbauer spectroscopy, and x-ray absorption spectroscopy, we found that the isovalent Ba2+ substitution systematically reduces the critical temperature of the SCO phase and additionally yields the spin-charge decoupling in x>0.75. Whereas the ground state remains in the SCO phase in the whole x region, an unexpected G-type AFM phase with incoherent charge ordering or charge fluctuation appears as the high-temperature phase in the range of x>0.75. Reflecting the competing nature between them, the G-type AFM phase partially exists as a metastable state in the SCO phase at low temperatures. We discuss the origin of the spin-charge decoupling and the emergence of the G-type AFM phase with charge fluctuation in terms of the bandwidth reduction by the Ba substitution.

关键词： Charge order Magnetic order Phase diagrams Perovskites Strongly correlated systems Transition metal oxides

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Measurement of the Higgs boson production via vector boson fusion and its decay into bottom quarks in proton-proton collisions at s = 13 TeV

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Journal of High Energy physics 2024年第1期2024卷 173页

作者： Hayrapetyan, A. Tumasyan, A. Adam, W. Andrejkovic, J.W. Bergauer, T. Chatterjee, S. Damanakis, K. Dragicevic, M. Escalante Del Valle, A. Hussain, P.S. Jeitler, M. Krammer, N. Lechner, L. Liko, D. Mikulec, I. Schieck, J. Schöfbeck, R. Schwarz, D. Sonawane, M. Templ, S. Waltenberger, W. Wulz, C.-E. Darwish, M.R. Janssen, T. Kello, T. Van Mechelen, P. Bols, E.S. D’Hondt, J. Dansana, S. De Moor, A. Delcourt, M. El Faham, H. Lowette, S. Makarenko, I. Morton, A. Müller, D. Sahasransu, A.R. Tavernier, S. Tytgat, M. Van Putte, S. Vannerom, D. Clerbaux, B. De Lentdecker, G. Favart, L. Hohov, D. Jaramillo, J. Khalilzadeh, A. Lee, K. Mahdavikhorrami, M. Malara, A. Paredes, S. Pétré, L. Postiau, N. Thomas, L. Vanden Bemden, M. Vander Velde, C. Vanlaer, P. De Coen, M. Dobur, D. Knolle, J. Lambrecht, L. Mestdach, G. Rendón, C. Samalan, A. Skovpen, K. Van Den Bossche, N. Vermassen, B. Wezenbeek, L. Benecke, A. Bruno, G. Bury, F. Caputo, C. Delaere, C. Donertas, I.S. Giammanco, A. Jaffel, K. Jain, Sa. Lemaitre, V. Lidrych, J. Mastrapasqua, P. Mondal, K. Tran, T.T. Wertz, S. Alves, G.A. Coelho, E. Hensel, C. Moraes, A. Rebello Teles, P. Aldá Júnior, W.L. Alves Gallo Pereira, M. Barroso Ferreira Filho, M. Brandao Malbouisson, H. Carvalho, W. Chinellato, J. Da Costa, E.M. Da Silveira, G.G. De Jesus Damiao, D. Fonseca De Souza, S. Martins, J. Mora Herrera, C. Mota Amarilo, K. Mundim, L. Nogima, H. Santoro, A. Silva Do Amaral, S.M. Sznajder, A. Thiel, M. Vilela Pereira, A. Bernardes, C.A. Calligaris, L. Fernandez Perez Tomei, T.R. Gregores, E.M. Mercadante, P.G. Novaes, S.F. Orzari, B. Padula, Sandra S. Aleksandrov, A. Antchev, G. Hadjiiska, R. Iaydjiev, P. Misheva, M. Shopova, M. Sultanov, G. Dimitrov, A. Ivanov, T. Litov, L. Pavlov, B. Petkov, P. Petrov, A. Shumka, E. Keshri, S. Thakur, S. Cheng, T. Guo, Q. Javaid, T. Mittal, M. Yuan, L. Bauer, G. Hu, Z. Yi, K. Chen, G.M. Chen, H.S. Chen, M. Iemmi, F. Jiang, C.H. Kapoor, A. Liao, H. Liu, Z.-A. Monti, F. Sharma, R. Song, J.N. Tao, J. Wang, J. Zhang, H. Agapitos, A. Ban, Y. Levin, A. Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Vienna Austria Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Instituto De Alta Investigación Universidad de Tarapacá Casilla 7 D Arica Chile Beihang University Beijing China Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Sun Yat-Sen University Guangzhou China University of Science and Technology of China Hefei China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) — Fudan University Shanghai China Zhejiang University Zhejiang Hangzhou China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt Center for High Energy Physics (CHEP-FU) Fayoum University El-Fayoum Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics

A measurement of the Higgs boson (H) production via vector boson fusion (VBF) and its decay into a bottom quark-antiquark pair (bb¯) is presented using proton-proton collision data recorded by the CMS experiment at s = 13 TeV and corresponding to an integrated luminosity of 90.8 fb⁻¹. Treating the gluon-gluon fusion process as a background and constraining its rate to the value expected in the standard model (SM) within uncertainties, the signal strength of the VBF process, defined as the ratio of the observed signal rate to that predicted by the SM, is measured to be μ_Hbb¯^qqh=1.01_−0.46^+0.55. The VBF signal is observed with a significance of 2.4 standard deviations relative to the background prediction, while the expected significance is 2.7 standard deviations. Considering inclusive Higgs boson production and decay into bottom quarks, the signal strength is measured to be μ_Hbb¯^incl.=0.99_−0.41^+0.48, corresponding to an observed (expected) significance of 2.6 (2.9) standard deviations. © The Author(s) 2024.

关键词： B physics Hadron-Hadron Scattering Higgs physics

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X-ray Radiation Damage Effects on Double-SOI Pixel Detectors for the Future Astronomical Satellite "FORCE"

arXiv

引用

arXiv 2022年

作者： Kitajima, Masatoshi Hagino, Kouichi Kohmura, Takayoshi Hayashida, Mitsuki Oono, Kenji Negishi, Kousuke Yarita, Keigo Doi, Toshiki Tsunomachi, Shun Tsuru, Takeshi G. Uchida, Hiroyuki Kayama, Kazuho Kodama, Ryota Tanaka, Takaaki Mori, Koji Takeda, Ayaki Nishioka, Yusuke Yukumoto, Masataka Mieda, Kira Yonemura, Syuto Ishida, Tatsunori Arai, Yasuo Kurachi, Ikuo Tokyo University of Science School of Science and Technology Department of Physics 2641 Yamazaki Noda Chiba278-8510 Japan Kanto Gakuin University Research Advancement and Management Organization 1-50-1 Mutsuura-higashi Kanazawa-ku Yokohama236-8501 Japan Kyoto University Faculty of Science Department of Physics Kitashirakawa-Oiwakecho Sakyo-ku Kyoto606-8502 Japan Konan University Department of Physics 8-9-1 Okamoto Higashinada Hyogo Kobe658-8501 Japan University of Miyazaki Faculty of Engineering Department of Applied Physics 1-1 Gakuen-Kibanodai-Nishi Miyazaki889-2192 Japan Institute of Particle and Nuclear Studies 1-1 Oho Ibaraki Tsukuba305-0801 Japan D&S Inc. 774-3-213 Higashiasakawacho Hachioji Tokyo193-0834 Japan

We have been developing the monolithic active pixel detector "XRPIX" onboard the future X-ray astronomical satellite "FORCE". XRPIX is composed of CMOS pixel circuits, SiO2 insulator, and Si sensor by utilizing the silicon-on-insulator (SOI) technology. When the semiconductor detector is operated in orbit, it suffers from radiation damage due to X-rays emitted from the celestial objects as well as cosmic rays. From previous studies, positive charges trapped in the SiO2 insulator are known to cause the degradation of the detector performance. To improve the radiation hardness, we developed XRPIX equipped with Double-SOI (D-SOI) structure, introducing an additional silicon layer in the SiO2 insulator. This structure is aimed at compensating for the effect of the trapped positive charges. Although the radiation hardness to cosmic rays of the D-SOI detectors has been evaluated, the radiation effect due to the X-ray irradiation has not been evaluated. Then, we conduct an X-ray irradiation experiment using an X-ray generator with a total dose of 10 krad at the SiO2 insulator, equivalent to 7 years in orbit. As a result of this experiment, the energy resolution in full-width half maximum for the 5.9 keV X-ray degrades by 17.8 ± 2.8% and the dark current increases by 89 ± 13%. We also investigate the physical mechanism of the increase in the dark current due to X-ray irradiation using TCAD simulation. It is found that the increase in the dark current can be explained by the increase in the interface state density at the Si/SiO2 interface. © 2022, CC BY.

关键词： Radiation damage

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