作者机构：
[Li, D; Tsai, Chaowei; Zhang, Yongkun; Zheng, Zheng; Cui, Xianghan; Li, Di; Zhu, Yuhao; Wang, Pei] Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China.;[Li, D; Zhang, Yongkun; Cui, Xianghan; Meng, Fanyi; Li, Di; Zhu, Yuhao] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.;[Niu, CH; Niu, Chenhui] Cent China Normal Univ, Inst Astrophys, Wuhan 430079, Peoples R China.;[Li, D; Li, Di] Univ KwaZulu Natal, NAOC UKZN Computat Astrophys Ctr, ZA-4000 Durban, South Africa.;[Feng, Yi] Zhejiang Lab, Res Ctr Intelligent Comp Platforms, Hangzhou 311100, Peoples R China.
通讯机构：
[Li, D ; Niu, CH ] C;Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China.;Univ Chinese Acad Sci, Beijing 100049, Peoples R China.;Cent China Normal Univ, Inst Astrophys, Wuhan 430079, Peoples R China.;Univ KwaZulu Natal, NAOC UKZN Computat Astrophys Ctr, ZA-4000 Durban, South Africa.
关键词：
Fast Radio Bursts;star formation rate;multi-structural;repeaters
摘要：
Abstract: Fast Radio Bursts (FRBs) are millisecond-duration transient events that are typically observed at radio wavelengths and cosmological distances but their origin remains unclear. Furthermore, most FRB origin models are related to the processes at stellar scales, involving neutron stars, blackholes, supernovae, etc. In this paper, our purpose is to determine whether multi-structural one-off FRBs and repeaters share similarities. To achieve this, we focus on analyzing the relationship between the FRB event rate and the star formation rate, complemented by statistical testing methods. Based on the CHIME/FRB Catalog 1, we calculate the energy functions for four subsamples, including apparent non-repeating FRBs (one-offs), repeaters, multi-structural one-offs, and the joint repeaters and multi-structural events, respectively. We then derive the FRB event rates at different redshifts for all four subsamples, all of which were found to share a similar cosmological evolution trend. However, we find that the multi-structural one-offs and repeaters are distinguishable from the KS and MWW tests. Keywords: Fast Radio Bursts; star formation rate; multi-structural; repeaters
期刊：
EPJ Web of Conferences,2023年276:03006-null ISSN：2100-014X
通讯作者：
Zhoul, YJ
作者机构：
[Zhoul, Yingjie] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Zhoul, Yingjie] Cent China Normal Univ, 1Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.
通讯机构：
[Zhoul, YJ ] C;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Cent China Normal Univ, 1Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.
会议名称：
20th International Conference on Strangeness in Quark Matter (SQM)
会议时间：
JUN 13-18, 2022
会议地点：
Busan, SOUTH KOREA
会议主办单位：
[Zhoul, Yingjie] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.^[Zhoul, Yingjie] Cent China Normal Univ, 1Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.
会议论文集名称：
EPJ Web of Conferences
摘要：
Strangeness production has been suggested to be a sensitive probe to the early-time dynamics of the nuclear matter created in heavy-ion collisions. Transverse momentum distributions and yields of strange hadrons provide important information on their production mechanisms and can help us probe the properties of the created medium and its evolution. Thanks to the high statistics data taken during the STAR BES-II program in 2018-2021, a series of measurements on the properties of strangeness production at low energies are carried out. In these proceedings, the production of <i>K<i/><sup>−<sup/>, , <i>ϕ<i/>, <i>Λ<i/>, and Ξ<sup>−<sup/> in Au+Au collisions at GeV are presented. The strange hadron transverse momentum spectra, rapidity density distributions, and particle ratios are shown. These results are compared with UrQMD model calculations, and the extracted kinetic freeze-out parameters are discussed and compared with the ones from higher collision energies.
摘要：
Hydrogen production from photoelectrochemical (PEC) water splitting has been regarded as a promising way to utilize renewable and endless solar energy. However, semiconductor film grown on photoelectrode suffers from numerous challenges, leading to the poor PEC performance. Herein, a straightforward sol-gel method with the ligand-induced growth strategy was employed to obtain dense and homogeneous copper bismuthate photocathodes for PEC hydrogen evolution reaction. By various characterizations, it was found that the nucleation and surface growth of CuBi2O4 layer induced by 2-methoxyethanol ligand (2-CuBi2O4) demonstrated a decent crystallinity and coverage, as well as a large grain size and a low oxygen vacancy concentration, leading to the good ability of light absorption and carrier migration. Consequently, under simulated sunlight irradiation (AM1.5G, 100 mW/cm2), the 2-CuBi2O4 photocathode achieved an enhanced photocurrent density of -1.34 mA & BULL;cm-2 at 0.4 V versus the reversible hydrogen electrode and a promising applied bias photon-to-current efficiency of 0.586%. This surface modification by ligand growth strategy will shed light on the future design of advanced photoelectrodes for PEC water splitting.
作者机构：
[Ketel, T.; Mulder, M.; Tuning, N.; Perez, D. H. Campora; Mauri, A.; Usachov, A.; de Vries, J. A.; Lukashenko, V.; Galati, M. D.; Heijhoff, K.; Sanchez Gras, C.; Veronesi, M.; Akiba, K.; Aaij, R.; Aaij, R; Snoch, A.; De Bruyn, K.; van Beuzekom, M.; Biolchini, A.; Martinez, M. Lucio; Jans, E.; Vos, K.; Geertsema, R. E.; Pellegrino, A.; Gabriel, E.; Grecu, A. T.; Merk, M.; Onderwater, C. J. G.; Bolognani, C. S.; van Veghel, M.; Butter, J. S.; Koppenburg, P.; Pawley, C. J.; Soares, M. Senghi; Klaver, S.; Raven, G.; Sole, S. Ferreres; Kostiuk, I.; Schubiger, M.; Hulsbergen, W.] Nikhef Natl Inst Subatom Phys, Amsterdam, Netherlands.;[Massafferri, A.; De Miranda, J. M.; Falcao, L. N.; Bediaga, I. B.; de Souza Leite, J. Baptista; Torres, M. Cruz; Machado, D. Torres; Gomes, A.; Carneiro Da Graca, U. De Freitas; dos Reis, A. C.; Santovetti, E.] Ctr Brasileiro Pesquisas Fis CBPF, Rio De Janeiro, Brazil.;[De Paula, B. Souza; Lopes, J. H.; Polycarpo, E.; Souza De Almeida, F. L.; Gandelman, M.; Gobel, C.; Rangel, M. S.; Hicheur, A.; Otalora Goicochea, J. M.; Garcia, L. Meyer; Rodrigues, F. Ferreira; De Paula, L.; Nasteva, I.; Amato, S.] Univ Fed Rio De Janeiro UFRJ, Rio De Janeiro, Brazil.;[Cai, H.; Bian, L.; Liu, G.; Qu, S.; Qin, N.; Ren, Z.; Xu, L.; Tou, D. Y.; Huang, X.; Li, H.; Li, A.; Hu, X.; Grauges, E.; Tan, Y.; Gu, C.; Gong, G.; Wang, X.; Bursche, A.; Kang, Y.; Fang, B.; Qi, H. R.; Chen, C.; Zhu, X.; Sun, L.; Luo, Y.; Yang, D.; Mu, H.; Zeng, M.; Dong, C.; Zhang, L.; Gan, Y.] Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China.;[Lu, Y.; Li, Y.; Ma, L.; Sheng, S.; Chen, S.; Greeven, L. M.; Li, P. -R.; Tobin, M.; Miao, D.; Jiang, X.; Batsukh, B.; Zou, Q.; Liu, S.] Inst High Energy Phys IHEP, Beijing, Peoples R China.
摘要：
A combined amplitude analysis is performed for the decays B0-+ D0D thorn s & pi;- and B thorn -+ D-D thorn s & pi; thorn , which are related by isospin symmetry. The analysis is based on data collected by the LHCb detector in proton -proton collisions at center-of-mass energies of 7, 8, and 13 TeV. The full data sample corresponds to an integrated luminosity of 9 fb-1. Two new resonant states with masses of 2.908 ⠂ 0.011 ⠂ 0.020 GeV and widths of 0.136 ⠂ 0.023 ⠂ 0.013 GeV are observed, which decay to D thorn s & pi; thorn and D thorn s & pi;- respectively. The former state indicates the first observation of a doubly charged open-charm tetraquark state with minimal quark content 1/2cs over bar ud over bar ⠃, and the latter state is a neutral tetraquark composed of 1/2cs over bar u over bar d ⠃ quarks. Both states are found to have spin-parity of 0 thorn , and their resonant parameters are consistent with each other, which suggests that they belong to an isospin triplet.
作者机构：
[Wu, Yuanfang; Xu, Mingmei] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Wu, Yuanfang; Xu, Mingmei] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Yuanfang Wu] K;Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China
摘要：
Abstract: In the QCD, a transition restoring the chiral symmetry occurs at a high temperature and density. Searching for the signals of the QCD phase transition is one of the goals of the current relativistic heavy-ion physics programs. The metastable state is a unique feature of the first-order phase transition. Using the van der Waals equation of state, the role of the metastable state in finite-size effects is analyzed. It is found that the finite-size effects of the first-order phase transition are closely related to the metastable state. Metastability can be observed in the distribution of the order parameters and the probability of its occurrence depends on the system scale. A sizable probability of the metastability requires a small enough system size. The possibility of observing the metastability in the RHIC/BES is discussed. Keywords: relativistic heavy-ion collision; phase transition; finite-size effect
摘要：
针对目前有线全双工通信系统中保密通信技术尚未成熟,在保密性能存在局限性,以同频同时全双工(co-frequency co-time full duplex,CCFD)系统的自干扰(self-interference,SI...展开更多 针对目前有线全双工通信系统中保密通信技术尚未成熟,在保密性能存在局限性,以同频同时全双工(co-frequency co-time full duplex,CCFD)系统的自干扰(self-interference,SI)消除理论为基础,提出一种物理层绝对安全的有线保密通信系统设计方案,通过巧妙地在接收端向链路中释放同时同频大功率人造噪声的方式将目标信号隐藏起来,再利用接收机对噪声信号的已知性,借助CCFD系统的模拟域自干扰消除技术在接收机中实现高dB的SI消除,实现Wyner意义上的绝对安全的保密通信。依据香农理论分析了延迟时间差、窃听位置、传输线长度等因素对SI消除能力和系统安全容量的影响。结果表明:系统的安全容量始终大于零,达到绝对保密通信效果。收起
摘要：
The semitauonic
$$ {B}_c^{-}\to J/\psi {\tau}^{-}{\overline{\nu}}_{\tau } $$
decay provides an ideal and clean mode to scrutinize possible new physics effects in
$$ b\to c{\tau}^{-}{\overline{\nu}}_{\tau } $$
transitions as indicated by the current data on R(D(*)) anomalies. In this work, we use the spin density matrix method to obtain the maximum information on the underlying physics of
$$ {B}_c^{-}\to J/\psi {\tau}^{-}{\overline{\nu}}_{\tau } $$
decay with both polarized τ lepton and J/ψ meson. Their subsequent decays, with J/ψ → μ+μ− as well as τ− → π−ντ, τ− → ρ−ντ and
$$ {\tau}^{-}\to {\ell}^{-}{\overline{\nu}}_{\ell }{\nu}_{\tau } $$
, are exploited to extract the energy and angular distributions of the charged final-state particles in the processes. Starting with the most general effective Hamiltonian relevant for the
$$ b\to c{\tau}^{-}{\overline{\nu}}_{\tau } $$
transitions, including all possible Lorentz structures of the dimension-six operators with both left- and right-handed neutrinos, we first derive the five-fold differential decay rate in terms of the visible final-state kinematics. From this distribution, we then construct in total 34 normalized observables, among which nine refer to the CP-violating triple product asymmetries that vanish within the Standard Model. We also construct five new observables based on the combinations of these normalized observables that can only be attributed to the right-handed neutrinos. On the other hand, considering the low statistics of the fully differential distribution, we introduce some integrated observables with only one kinematic variable left, which are more promising to be measured due to the largely increased statistics. The sensitivities of all these observables to the different new physics scenarios are investigated in detail. Finally, assuming an ideal circumstance, we give an estimate of the statistical uncertainties of the nine CP-conserving observables at LHCb and found that τ− → π−ντ has the highest analyzing power among the three τ decay channels.
通讯机构：
[Shi, Y ] C;Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 200050, Peoples R China.;Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China.
摘要：
1 at% Ce3+-doped Gd3Ga2Al3O12 (GGAG) single crystals were grown by an optical floating zone (OFZ) method and a traveling solvent floating zone (TSFZ) method. To reveal their structure and chemical composition homogeneity, X-ray diffraction (XRD) and high-resolution inductively coupled plasma atomic emission spectrometry (ICP-AES) were conducted on the as-grown Ce:GGAG crystals at 4 different positions along the growth direction. Compared with the Ce:GGAG crystals grown by the OFZ method (Ce:GGAG-OFZ), the Ce:GGAG crystals grown by the TSFZ method (Ce:GGAG-TSFZ) presented better Ce3+ distribution homogeneity which varied from 0.21 to 0.29 at%. However, the segregation coefficient of Ce3+ in Ce:GGAG-OFZ was found to be higher than that in Ce:GGAG-TSFZ, revealing a different solidification rate between them. The comparison study shows that the photoluminescence (PL) intensity of Ce:GGAG-TSFZ is about twice higher than that of Ce:GGAG-OFZ and the maximum light yield (LY) of 35 340 photons per MeV also occurs in the former. Trap depths were measured to be 0.70 eV and 0.98 eV by TL glow curves. The LY value of Ce:GGAG-TSFZ along the growth direction fluctuated to a lesser extent with respect to that of Ce:GGAG-OFZ; the latter decreases gradually along the growth direction. It is concluded that the TSFZ method helps to improve the homogeneity of crystal composition when growing crystals with multiple compositions or incongruent compounds.
作者机构：
[Zhu, Xueqiang; Feng, Sheng-Qin] China Three Gorges Univ, Coll Sci, Yichang 443002, Peoples R China.;[Feng, Sheng-Qin] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Feng, Sheng-Qin] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Feng, Sheng-Qin] China Three Gorges Univ, Ctr Astron & Space Sci, Yichang 443002, Peoples R China.
通讯机构：
[Sheng-Qin Feng] C;College of Science, China Three Gorges University, Yichang 443002, China<&wdkj&>Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China<&wdkj&>Center for Astronomy and Space Sciences, China Three Gorges University, Yichang 443002, China
摘要：
We study the properties of the shear viscosity coefficient of quark matter at finite temperature and chemical potential near chiral phase transition in a strong background magnetic field. A strong magnetic field induces anisotropic features, phase-space Landau-level quantization, and if the magnetic field is sufficiently strong, interferes with prominent QCD phenomena such as dynamical quark mass generation, likely affecting the quark matter transport characteristics. The modified Nambu-Jona-Lasinio model with inverse magnetic catalysis effect by fitting the Lattice QCD results is used to calculate the changes of quasiparticle related thermodynamic quantities, and the shear viscosity of the system medium, which is analyzed under the relaxation time approximation. We quantify the influence of the order of chiral phase transition and the critical endpoint on dissipative phenomena in such a magnetized medium. When the magnetic field exists, the shear viscosity coefficient of the dissipative fluid system can be decomposed into five different components. In the strong field limit, we make a detailed study of the dependencies of 172 and 174 on temperature and magnetic field for the first order phase transition and critical endpoint transition, respectively. It is found that 172 and 174 both decrease with magnetic field and increase with temperature, and the discontinuities of 172 and 174 occur at the first order phase transition point.
摘要：
Jet quenching has long been regarded as one of the key signatures for the formation of quark-gluon plasma in heavy-ion collisions. Despite significant efforts, the separate identification of quark and gluon jet quenching has remained as a challenge. Here we show that J=ik in high transverse momentum (pT) region provides a uniquely sensitive probe of in-medium gluon energy loss since its production at high pT is particularly dominated by gluon fragmentation. Such gluon-dominance is first demonstrated for the baseline of proton-proton collisions within the framework of leading power non-relativistic quantum chromodynamics factorization formalism. We then use the linear Boltzmann transport model combined with hydrodynamics for the simulation of jet-medium interaction in nucleus-nucleus collisions. The sat-isfactory description of experimental data on both nuclear modification factor RAA and elliptic flow v2 reveals, for the first time, that the gluon jet quenching is the driving force for high pT J=ik suppression. This novel finding is further confirmed by the data-driven Bayesian analyses of relevant experimental measurements, from which we also obtain the first quantitative extraction of the gluon energy loss dis-tribution in the quark-gluon plasma.(c) 2023 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
作者机构：
[Xie, Yunlong; Liu, Yisi; Yang, Lun; Zhou, Jianqing; Du, Yue] Hubei Normal Univ, Inst Adv Mat, Huangshi 435002, Peoples R China.;[Yu, Ying; Yu, Luo; Zhou, Jianqing] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Peoples R China.
通讯机构：
[Luo Yu; Ying Yu] C;College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China
摘要：
Hydrogen is a green and efficient energy candidate for the sustainable development of society. The electrocatalytic hydrogen evolution reaction (HER) of water splitting is a facile and sustainable approach to produce high-purity green hydrogen with zero carbon emission. Compared with the strong corrosivity of acidic/alkali electrolytes, water splitting in neutral electrolytes is a more promising choice, since it provides a mild environment for large-scale hydrogen production. Multi-site engineering is one of the most effective strategies for improving the neutral HER activity, because the neutral HER involves water dissociation and hydrogen adsorption/desorption processes, which require appropriate adsorption energies for different intermediates. Obviously, single-site catalysts cannot satisfy these demands, but multi-site electrocatalysts can offer multiple catalytic sites to separately interact with different intermediates and optimize adsorption strengths. Herein, we focus on multi-site electrocatalysts for the neutral HER, with the aim of offering an overview of novel design principles, progress, and perspectives in this area. To clearly reveal the important functions of multiple sites for the neutral HER, we first introduce the theoretical fundamentals of multi-site electrocatalysts for the HER in neutral media, then summarize a series of representative multi-site electrocatalysts, and systematically discuss these electrocatalysts from the theoretical calculation and experimental aspects. Finally, some challenges and further perspectives for the future development of multi-site electrocatalysts are presented. It is hoped that the review will provide valuable guidance for the rational design of multi-site water splitting electrocatalysts.
作者机构：
[Ketel, T.; Tuning, N.; Mauri, A.; Usachov, A.; Lukashenko, V.; Galati, M. D.; Heijhoff, K.; Veronesi, M.; Akiba, K.; Aaij, R.; Snoch, A.; van Beuzekom, M.; Biolchini, A.; Jans, E.; Greeven, L. M.; Geertsema, R. E.; Pellegrino, A.; Gabriel, E.; Merk, M.; Butter, J. S.; Koppenburg, P.; Soares, M. Senghi; Klaver, S.; Gras, C. Sanchez; Raven, G.; Sole, S. Ferreres; Kostiuk, I.; Schubiger, M.; Hulsbergen, W.] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands.;[Baptista de Souza Leite, J.; De Freitas Carneiro Da Graca, U.; Massafferri, A.; Cruz Torres, M.; De Miranda, J. M.; Falcao, L. N.; Bediaga, I. B.; Leite, JBD; Gomes, A.; Torres Machado, D.; dos Reis, A. C.] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil.;[Lopes, J. H.; Polycarpo, E.; Souza De Paula, B.; Souza De Almeida, F. L.; Gandelman, M.; Rangel, M. S.; Ferreira Rodrigues, F.; Hicheur, A.; Otalora Goicochea, J. M.; De Paula, L.; Nasteva, I.; Amato, S.; Meyer Garcia, L.] Univ Fed Rio de Janeiro, Rio De Janeiro, Brazil.;[Wang, Z.; Qu, S.; Qin, N.; Ren, Z.; Xu, L.; Tou, D. Y.; Wang, J.; Li, A.; Hu, X.; Tan, Y.; Gu, C.; Gong, G.; Kang, Y.; Qi, H. R.; Chen, C.; Zhu, X.; Luo, Y.; Yang, D.; Mu, H.; Zeng, M.; Dong, C.; Zhang, L.; Gan, Y.] Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China.;[Lu, Y.; Li, Y.; Ma, L.; Sheng, S.; Li, T.; Wang, J.; Chen, S.; Tobin, M.; Miao, D.; Grieser, N. A.; Jiang, X.; Batsukh, B.; Zou, Q.; Liu, S.] Inst High Energy Phys, Beijing, Peoples R China.
通讯机构：
[Leite, JBD ] C;Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil.
摘要：
An amplitude analysis of the B thorn & RARR; D thorn s D-s K thorn decay is carried out to study for the first time its intermediate resonant contributions, using proton-proton collision data collected with the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV. A near-threshold peaking structure, referred to as X(3960), is observed in the D thorn s D-s invariant-mass spectrum with significance greater than 12 standard deviations. The mass, width, and the quantum numbers of the structure are measured to be 3956 1 5 1 10 MeV, 43 1 13 1 8 MeV, and JPC = 0 thorn thorn , respectively, where the first uncertainties are statistical and the second systematic. The properties of the new structure are consistent with recent theoretical predictions for a state composed of cc over bar ss over bar quarks. Evidence for an additional structure is found around 4140 MeV in the D thorn s D-s invariant mass, which might be caused either by a new resonance with the 0 thorn thorn assignment or by a J=& psi;& phi; & LRARR; D thorn s D-s coupled-channel effect.
作者机构：
[J. Baptista de Souza Leite; I.B. Bediaga; U. De Freitas Carneiro Da Graca; J.M. De Miranda; A.C. dos Reis; L.N. Falcao; A. Massafferri; D. Torres Machado] Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil;[S. Amato; L. De Paula; F. Ferreira Rodrigues; M. Gandelman; A. Hicheur; J.H. Lopes; L. Meyer Garcia; I. Nasteva; J.M. Otalora Goicochea; E. Polycarpo; M.S. Rangel; F.L. Souza De Almeida; B. Souza De Paula] Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil;[C. Chen; C. Dong; Y. Gan; G. Gong; C. Gu; X. Hu; Y. Kang; A. Li; Y. Luo; H. Mu; H.R. Qi; N. Qin; S. Qu; Z. Ren; Y. Tan; D.Y. Tou; L. Xu; D. Yang; M. Zeng; L. Zhang] Center for High Energy Physics, Tsinghua University, Beijing, China;[B. Batsukh; S. Chen; N.A. Grieser; Y. Li; L. Ma; M. Tobin] Institute Of High Energy Physics (IHEP), Beijing, China;[X. Dai; Y. Gao; W. Hu; Y. Shang; Z. Shen; X. Tong; G. Wan; Y. Wei; A. Xu; X. Yang; C. Zhang; S. Zhang; T. Zhou] School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China
摘要：
A search for the rare decays and is performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13, corresponding to an integrated luminosity of 2.0. No significant signal is observed for either decay mode and upper limits on their branching fractions are set using and decays as normalization channels. The upper limits are and at 95% confidence level for the and decay modes, respectively. This is the first reported search for the decay, while the upper limit on the branching fraction improves upon the previous best limit.
期刊：
Journal of High Energy Physics,2023年2023(3):1-30 ISSN：1029-8479
通讯作者：
Yu-Qi Xiao
作者机构：
[Xiao, Yu-Qi; Chen, Shao-Long] Cent China Normal Univ, Key Lab Quark & Lepton Phys MoE, Wuhan 430079, Peoples R China.;[Xiao, Yu-Qi; Chen, Shao-Long] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Chen, Shao-Long] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China.
通讯机构：
[Yu-Qi Xiao] K;Key Laboratory of Quark and Lepton Physics (MoE) and Institute of Particle Physics, Central China Normal University, Wuhan, China
关键词：
Baryon;Lepton Number Violation;Specific BSM Phenomenology
摘要：
We study the systematic decomposition of the dimension nine neutron-antineutron oscillation operators at tree and one-loop levels. We discuss the topologies’ generation and the assignment of the chiral quarks. The completed lists of the decompositions are provided. We furthermore show an example that the neutron-antineutron oscillation occurs at one-loop level, with the tiny neutrino mass being generated via the scotogenic model and proton decay being evaded.
作者：
R. Aaij;A. S. W. Abdelmotteleb;C. Abellan Beteta;F. Abudinén;T. Ackernley;...
期刊：
Journal of High Energy Physics,2023年2023(8):1-27 ISSN：1029-8479
通讯作者：
I. Belyaev
作者机构：
[R. Aaij; K. Akiba; A. Biolchini; J. S. Butter; S. Ferreres Sole; E. Gabriel; M. D. Galati; R. E. Geertsema; L. M. Greeven; K. Heijhoff; W. Hulsbergen; E. Jans; T. Ketel; P. Koppenburg; I. Kostiuk; A. Pellegrino; C. Sanchez Gras; M. Schubiger; A. Snoch; N. Tuning; M. van Veghel; M. Veronesi] Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands;[A. S. W. Abdelmotteleb; F. Abudinén; J. J. Back; A. Beck; T. Blake; M. F. Cicala; L. M. Garcia Martin; T. Gershon; R. J. Hunter; T. P. Jones; M. Kenzie; M. Kreps; T. Latham; E. Millard; E. Muhammad; B. Pagare; L. Paolucci; M. Ramos Pernas; M. Vesterinen; A. R. Wiederhold; M. Xu] Department of Physics, University of Warwick, Coventry, United Kingdom;[C. Abellan Beteta; M. Andersson; M. Atzeni; V. Bellee; R. Bernet; C. Betancourt; Ia. Bezshyiko; A. Buonaura; D. C. Craik; D. De Simone; V. Denysenko; J. Eschle; S. Esen; M. Ferrillo; D. Lancierini; C. A. Manzari; A. Mathad; K. Müller; P. Owen; N. Serra; E. Smith; O. Steinkamp; A. Terentev; Z. Wang] Physik-Institut, Universität Zürich, Zürich, Switzerland;[T. Ackernley; T. J. V. Bowcock; J. Brown; G. Casse; A. J. Chadwick; C. A. Chavez Barajas; S. Farry; V. Franco Lima; T. Halewood-leagas; J. Hammerich; T. Harrison; K. Hennessy; D. Hutchcroft; P. J. Marshall; K. Rinnert; S. Scherl; T. Shears; E. Vilella Figueras; L. E. Yeomans] Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom;[B. Adeva; P. Baladron Rodriguez; S. Belin; A. Brea Rodriguez; A. Brossa Gonzalo; A. Casais Vidal; V. Chobanova; X. Cid Vidal; I. Corredoira; J. Dalseno; L. Dieste Maronas; C. Eirea Orro; M. Fernandez Gomez; A. Gallas Torreira; B. Garcia Plana; A. Gioventù; C. Landesa Gomez; J. Lomba Castro; S. López Soliño; D. Martinez Santos; T. Mombächer; J. Novoa Fernandez; A. Pereiro Castro; M. Plo Casasus; C. Prouve; E. Rodriguez Fernandez; E. R. R. Rodriguez Rodriguez; M. Romero Lamas; A. Romero Vidal; R. A. Ruiz Fernandez; J. J. Saborido Silva; C. Santamarina Rios; S. Sellam; P. Vazquez Regueiro; C. Vázquez Sierra] Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
通讯机构：
[I. Belyaev] I;Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia
关键词：
B Physics;Branching fraction;Charm Physics;Hadron-Hadron Scattering
摘要：
The B+ → Jψη′K+ decay is observed for the first time using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9 fb−1. The branching fraction of this decay is measured relative to the known branching fraction of the B+ → ψ(2S)K+ decay and found to be
$$ \frac{\mathcal{B}\left({B}^{+}\to {J\psi \eta}^{\prime }{K}^{+}\right)}{\mathcal{B}\left({B}^{+}\to \psi (2S){K}^{+}\right)}=\left(4.91\pm 0.47\pm 0.29\pm 0.07\right)\times {10}^{-2}, $$
where the first uncertainty is statistical, the second is systematic and the third is related to external branching fractions. A first look at the J/ψη′ mass distribution is performed and no signal of intermediate resonances is observed.
摘要：
The detection of electrical insulators in unmanned aerial vehicle (UAV) images using deep learning has made great progress in recent years, but little research has been conducted in the same field in remote sensing (RS) images. In this article, a novel method was proposed to detect insulators on 500-kV transmission towers in RS images. The proposed method consists of three components including 1) a super-resolution (SR) network to improve image resolution; 2) an object detection model to detect 110-, 220-, and 500-kV electrical power towers along transmission pipelines; and 3) a semantic segmentation network to identify insulators on the detected 500-kV towers. In addition, the online hard example mining (OHEM) method and class weight calculation method were utilized to handle the imbalanced data among different classes during training. The proposed model was evaluated on SuperView-1 and WorldView-3 satellite images collected in four regions. Experimental results show that the proposed method can effectively detect insulators in high-resolution satellite images and achieved the highest F1 score of 0.7952. The codes are available at https://github.com/hardworking-jws/insulator-detection-remote-sensing
作者机构：
[Hai Lin; Kun Wang; Weilong Wang] College of Physics Science and Technology, Central China Normal University, Wuhan 430079, China;School of Physics and Telecommunications, HuangGang Normal University, Huanggang 438000, China;[Jie Xiong; Baoping Yang] College of Physics Science and Technology, Central China Normal University, Wuhan 430079, China<&wdkj&>School of Physics and Telecommunications, HuangGang Normal University, Huanggang 438000, China
通讯机构：
[Hai Lin] C;College of Physics Science and Technology, Central China Normal University, Wuhan 430079, China
摘要：
High-order bandpass filtering responses are highly desirable for frequency-selective surfaces (FSSs) in narrowband antenna/radar systems. In this paper, the design process of a reconfigurable dual-band FSS with second-order response is presented. Initially, the basic dumbbell-shaped resonator used in this design is theoretically investigated using the characteristic mode analysis (CMA) method to study the relation between geometric design parameters and the excited orthogonal resonance modes in different frequency bands. Then, an additional CMA process was performed on a unit cell with four such patch resonators arranged with 90-degree rotation between adjacent ones. This detailed analysis leads to a polarization-independent FSS design with a high-order dual-band response. Two of these composite resonators are combined back-to-back through coupling apertures on the middle layer. Finally, PIN diodes are loaded on separate layers to realize independent pass-band switching. The loading place of the PIN diodes is carefully chosen based on electromagnetic field analysis. A prototype was also fabricated and experimentally tested. Experimental results show that this FSS has two independently switchable passbands centered at 3 GHz and 4.8 GHz.
作者机构：
[Li, Yiming; Chen, Shanzhen] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.;[Qian, Wenbin] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.;[Shen, Zhihong; Zhang, Yanxi; Yang, Zhenwei] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China.;[Shen, Zhihong; Zhang, Yanxi; Yang, Zhenwei] Peking Univ, Sch Phys, Beijing 100871, Peoples R China.;[Xie, Yuehong] Cent China Normal Univ, Key Lab Quark & Lepton Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Yiming Li] I;Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
关键词：
LHCb;flavour physics;CP vioation
摘要：
Heavy flavour physics provides excellent opportunities to indirectly search for new physics at very high energy scales and to study hadron properties for deep understanding of the strong interaction. The LHCb experiment has been playing a leading role in the study of heavy flavour physics since the start of the LHC operations about ten years ago, and made a range of high-precision measurements and unexpected discoveries, which may have far-reaching implications on the field of particle physics. This review highlights a selection of the most influential physics results on CP violation, rare decays, and heavy flavour production and spectroscopy obtained by LHCb using the data collected during the first two operation periods of the LHC. The upgrade plan of LHCb and the physics prospects are also briefly discussed.
