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With Competitive Payload Design,HXMT Is “Important Extension of high energy astrophysics from Space”

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Bulletin of the Chinese Academy of Sciences 2016年第3期 144-144页

作者： Jonathan E.Grindlay Harvard University Harvard Smithsonian Center for Astrophysics

HXMT is a significant advance for high energy astrophysics in both China and the whole international *** sensitivity and broad energy band coverage with its 3 principal instruments(LE,ME,HE)are very *** strength of the modulation technique is its simplicity:imaging can be achieved without the need for position-sensitive detectors(for the HE),which makes

关键词： HXMT very With Competitive Payload Design,HXMT Is Important Extension of high energy astrophysics from Space

New Insights on Gamma-Ray Burst Radiation Mechanisms from Multiwavelength Observations

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Research in Astronomy and astrophysics 2025年第2期25卷 3-12页

作者： Yu-Hua Yao Fang-Sheng Min Shi Chen Yi-Qing Guo College of Physics Chongqing University Key Laboratory of Particle astrophysics Institute of High Energy Physics Chinese Academy of Sciences Wisconsin Ice Cube Particle astrophysics Center University of Wisconsin–Madison University of Chinese Academy of Sciences School of Physics and Astronomy Yunnan University Tianfu Cosmic Ray Research Center

The study of high-energy gamma-ray emission from gamma-ray bursts(GRBs) involves complex synchrotron radiation and synchrotron self-Compton(SSC) scattering mechanisms with multiple parameters exhibiting a wide distribution. Recent advancements in GRB research, particularly the observation of very high energy(VHE,>100 Ge V) radiation, have ushered in a new era of multiwavelength exploration, offering fresh perspectives and limitations for understanding GRB radiation mechanisms. This study aimed to leverage VHE observations to refine constraints on synchrotron + SSC radiation from electrons accelerated by forward shocks. By analyzing two external environments—the uniform interstellar medium and stratified stellar wind medium, we conducted spectral and variability fitting for five specific bursts(GRB 180720B, GRB 190114C, GRB 190829A, GRB 201216C, and GRB 221009A) to identify the optimal parameters characterizing these events. A comparative analysis of model parameter distributions with and without VHE radiation observations reveals that the magnetic energy equipartition factor εBis more concentrated with VHE emissions. This suggests that VHE emissions may offer greater constraints on this microphysical parameter. Additionally, we found that the energy budget between VHE and ke V–Me V γ-ray emissions under the SSC radiation exhibits an almost linear relationship, which may serve as a tool to differentiate radiation mechanisms. We anticipate future statistical analyses of additional VHE bursts to validate our findings.

关键词： (transients:) gamma-ray bursts gamma-rays: ISM radiation mechanisms: non-thermal

Silk damping in scalar-induced gravitational waves:a novel probe for new physics

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Science China(Physics,Mechanics & Astronomy) 2025年第1期68卷 75-81页

作者： Yan-Heng Yu Sai Wang Theoretical Physics Division Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Physics University of Chinese Academy of SciencesBeijing 100049China

Silk damping is well known in the study of cosmic microwave background(CMB)and accounts for suppression of the angular power spectrum of CMB on large angular *** this article,we study the effect of Silk damping on the scalar-induced gravitational waves(SIGWs).Resulting from the dissipation of cosmic fluid,the Silk damping notably suppresses the energy-density spectrum of SIGWs on scales comparable to a diffusion scale at the decoupling time of weakly-interacting *** effect offers a novel observable for probing the underlying particle interaction,especially for those mediated by heavy gauge bosons beyond the standard model of *** anticipate that pulsar timing arrays are sensitive to gauge bosons with mass∼10^(3)-10^(4)GeV,while space-and ground-based interferometers to those with mass∼10^(7)-10^(12)GeV,leading to essential comple-ments to on-going and future experiments of high-energy physics.

关键词： scalar-induced gravitational waves Silk damping new physics

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Improved constraints on Higgs boson self-couplings with quartic and cubic power dependencies of the cross section

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Chinese Physics C 2025年第02期 85-92页

作者：李海涛司宗国王健张晓赵丹 School of Physics Shandong University Center for high energy Physics Peking University

Precise determination of the Higgs boson self-couplings is essential for understanding the mechanism underlying electroweak symmetry breaking. However, owing to the limited number of Higgs boson pair events at the LHC, only loose constraints have been established to date. Current constraints are based on the assumption that the cross section is a quadratic function of the trilinear Higgs self-coupling within the κ framework. Incorporating higher-order quantum corrections from virtual Higgs bosons would significantly alter this functional form, introducing new quartic and cubic power dependencies on the trilinear Higgs self-coupling. To derive this new functional form,we propose a specialized renormalization procedure that tracks all Higgs self-couplings at each calculation step. Additionally, we introduce renormalization constants for coupling modifiers within the κ framework to ensure the cancellation of all ultraviolet divergences. With new functional forms of the cross sections in both the gluon-gluon fusion and vector boson fusion channels, the upper limit of κλ3H=λ3H/λ3SHMset by the ATLAS（CMS） collaboration is reduced from 6.6（6.49） to 5.4（5.37）. However, extracting a meaningful constraint on the quartic Higgs self-coupling λ4Hfrom Higgs boson pair production data remains challenging. We also present the invariant mass distributions of the Higgs boson pair at different values of the self-couplings, which could assist in setting optimal cuts for experimental analysis.

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Effects of salinity and betaine addition on anaerobic granular sludge properties and microbial community succession patterns in organic saline wastewater

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Journal of Environmental Sciences 2025年第1期147卷 310-321页

作者： Zhifei Zhang Jinquan Wan Gang Ye Yan Wang Yuwei Bai Zhicheng Yan College of Environment and energy South China University of TechnologyGuangzhou 510006China Shijiazhuang high Tech Industrial Development Zone Water Supply and Drainage Company Shijiazhuang 050000China

In this study,the effects of different salinity gradients and addition of compatible solutes on anaerobic treated effluent water qualities,sludge characteristics and microbial communities were *** increase in salinity resulted in a decrease in particle size of the granular sludge,which was concentrated in the range of 0.5-1.0 *** content of EPS(extracellular polymeric substances)in the granular sludge gradually increased with increasing salinity and the addition of betaine(a typical compatible solute).Meanwhile,the microbial community structure was significantly affected by salinity,with high salinity reducing the diversity of *** higher salinity,Patescibacteria and Proteobacteria gradually became the dominant phylum,with relative abundance increasing to 13.53%and 12.16%at 20 g/L *** and its subordinate Desulfovibrio,which secrete EPS in large quantities,dominated significantly after betaine *** relative abundance reached 13.65%and 7.86%at phylum level and genus *** effect of these changes on the treated effluent was shown as the average chemical oxygen demand(COD)removal rate decreased from 82.10%to 79.71%,78.01%,68.51%and 64.55%when the salinity gradually increased from 2 g/L to 6,10,16 and 20 g/*** the salinity of 20 g/L,average COD removal increased to 71.65%by the addition of 2 mmol/L *** gradient elevated salinity and the exogenous addition of betaine played an important role in achieving stability of the anaerobic system in a highly saline environment,which provided a feasible strategy for anaerobic treatment of organic saline wastewater.

关键词： Organic saline wastewater Anaerobic granular sludge Compatible solute Extracellular polymeric substance Microbial community

Decay properties of light 1-+hybrids

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Science China(Physics,Mechanics & Astronomy) 2025年

作者： Juzheng Liang Siyang Chen Ying Chen Chunjiang Shi Wei Sun Institute of high energy Physics Chinese Academy of Sciences School of Physics University of Chinese Academy of Sciences School of Physics University of Science and Technology of China Center for high energy Physics Henan Academy of Sciences

We explore the decay properties of the isovector and isoscalar 1-+light hybrids,π1and η1,in N _f=2 lattice QCD at a pion mass mπ≈417 *** McNeile and Michael method is adopted to extract the effective couplings for individual decay modes,which are used to estimate the partial decay widths ofπ1（1600） and η1（1855） by assuming SU（3） *** partial decay widths ofπ1（1600） are predicted to be (Γb1π,Γf1（1285）π,Γρπ,ΓK*K)=(325±75,O（10）,52±7,8.6±1.3) Me V,and the total width is estimated to be 396±90 MeV,considering only statistical *** η1（1855） and the 4.4σsignal observed by BESIII (labeled as η1（2200）) are taken as the two mass eigenstates of the isoscalar 1-+light hybrids in SU（3）,then the dominant decay channel（s）of η1（1855）(η1（2200）) is K1（1270）K (K1（1270）K and K1（1400）K) through the 1+（-）0-（+）*** vector-vector decay modes are also significant for the two η*** the mixing angle α≈22.7°obtained from lattice QCD for the two η1states,the total widths are estimated to beΓη1（1855）=282（85） MeV andΓη1（2200）=455（143） Me *** former is compatible with the experimental width of η1（1855）.Although many systematic uncertainties are not well controlled,these results are qualitatively informative for the experimental search for light hybrids.

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Strong coupling from inclusive semileptonic decay of charmed mesons

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Chinese Physics C 2025年第02期 5-10页

作者：吴金飞娄辛丑车逾之李刚黄燕萍阮曼奇叶竞波 Institute of high energy Physics Chinese Academy of Sciences China Center of Advanced Science and Technology University of Texas at Dallas Center for high energy Physics Henan Academy of Sciences University of Chinese Academy of Sciences

In this study,we employed the heavy quark expansion model with the kinetic scheme to evaluate αS（mc2）,the strong coupling constant at the charm quark mass mc, using data on inclusive semileptonic decays of charmed *** the experimental values of the semileptonic decay widths of the D0and the D+,the value of αs（mc2）was determined to be 0.445±0.009±0.114,where the first uncertainty is experimental and the second is *** value of αs（mc2） is in good agreement with the value of αs（mc2） which calculated by running αS（mZ2） at the Z0boson mass mZwith the renormalization group evolution *** addition,the values of αs（mc2） obtained individually from each of the D0,D+,and Ds+mesons were consistent,as they were of the same origin.

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Spectroscopy of excited quarkonium states in the light-front quark model

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Chinese Physics C 2025年第02期 37-50页

作者： Ritwik Acharyya Satyajit Puhan Harleen Dahiya Narinder Kumar Computational high energy Physics Lab Department of PhysicsDr.B R Ambedkar National Institute of Technology Jalandhar Computational Theoretical high energy Physics Lab Department of PhysicsDoaba College

We investigated the ground state(1S), radially excited states(2S) and(3S), and orbitally excited state(1P) for the heavy charmonia(c■) and bottomonia(b■) mesons in the light-front quark model(LFQM). The lightfront wave functions have been successful in explaining various physical properties of meson states in the past, especially for the 1S and 2S states. However, the radially excited state 3S and orbitally excited state 1P have rarely been investigated. In this study, we considered these two excited states and investigated the electromagnetic form factors(EMFFs), charge radii, decay constants, parton distribution functions(PDFs), and the distribution amplitudes(DAs)for the quarkonia system. For the sake of completeness, we also studied the ground and the first excited states of quarkonia mesons. We also illustrated the 3D wave functions for the radially excited states to study their nodal structures.

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The GECAM ground search system for gamma-ray transients

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Science China(Physics,Mechanics & Astronomy) 2025年第3期68卷 161-174页

作者： Ce Cai Yan-Qiu Zhang Shao-Lin Xiong Ping Wang Jian-Hui Li Xiao-Bo Li Cheng-Kui Li Yue Huang Shi-Jie Zheng Li-Ming Song Shuo Xiao Qi-Bin Yi Yi Zhao Sheng-Lun Xie Rui Qiao Yan-Qi Du Zhi-Wei Guo Wang-Chen Xue Chao Zheng Jia-Cong Liu Chen-Wei Wang Wen-Jun Tan Yue Wang Jin-Peng Zhang Chao-Yang Li Guo-Ying Zhao Xiao-Yun Zhao Xiao-Lu Zhang Zhen Zhang Wen-Xi Peng Xiang Ma Jing-Yan Shi Dong-Ya Guo Jin Wang Xin-Qiao Li Xiang-Yang Wen Zheng-Hua An Fan Zhang College of Physics and Hebei Key Laboratory of Photophysics Research and Application Hebei Normal UniversityShijiazhuang050024China Key Laboratory of Particle astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China University of Chinese Academy of Sciences Beijing100049China School of Physics and Electronic Science Guizhou Normal UniversityGuiyang550001China Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing Guizhou Normal UniversityGuiyang550001China School of Physics and Optoelectronics Xiangtan UniversityXiangtan411105China School of Computer and Information Dezhou UniversityDezhou253023China Institute of astrophysics Central China Normal UniversityWuhan430079China

In the era of time-domain,multi-messenger astronomy,the detection of transient events on the high-energy electromagnetic sky has become more important than *** gravitational wave high-energy electromagnetic counterpart all-sky monitor(GECAM)is a dedicated mission to monitor gamma-ray transients,launched in December,2020.A real-time on-board trigger and location software,using the traditional signal-to-noise ratio(SNR)method for blind search,is constrained to relatively bright signals due to the limitations in on-board computing resources and the need for real-time *** this work,we developed a ground-based pipeline for GECAM to search for various transients,especially for weak bursts missed by on-board *** pipeline includes both automatic and manual mode,offering options for blind search and targeted *** targeted search is specifically designed to search for interesting weak bursts,such as gravitational wave-associated gamma-ray bursts(GRBs).From the ground search of the data in the first year,GECAM has been triggered by 54 GRBs and other transients,including soft gamma-ray repeaters,X-ray binaries,solar flares,terrestrial gamma-ray *** report the properties of each type of triggers,such as trigger time and light *** this search pipeline and assuming a soft Band spectrum,the GRB detection sensitivity of GECAM is increased to about 1.1×10^(-8)erg cm^(-2)s^(-1)(10-1000 ke V,burst duration of 20 s).These results demonstrate that the GECAM ground search system(both blind search and targeted search)is a versatile pipeline to recover true astrophysical signals which were too weak to be found in the on-board search.

关键词： gamma-ray sources gravitational waves data analysis gamma-ray telescopes

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