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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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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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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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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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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

Constraints on holographic QCD phase transitions from PTA observations

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Science China(physics,Mechanics & Astronomy) 2025年第1期68卷 67-74页

作者： Song He Li Li Sai Wang Shao-Jiang Wang Center for Theoretical physics and College of physics Jilin UniversityChangchun 130012China School of Physical Science and Technology Ningbo UniversityNingbo 315211China CAS Key Laboratory of Theoretical physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Fundamental physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences(UCAS)Hangzhou 310024China Theoretical physics Division Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Physical Sciences University of Chinese Academy of Sciences(UCAS)Beijing 100049China Max Planck institute for Gravitational physics(Albert Einstein institute) Am Muhlenberg 1Golm 14476Germany

The underlying physics of QCD phase transition in the early Universe remains largely unknown due to its strong-coupling nature during the quark-gluon plasma/hadron gas transition,yet a holographic model has been proposed to quantitatively fit the lattice QCD data while with its duration of the first-order phase transition(FoPT)left *** specific baryon chemical poten-tial,the first-order QCD phase transition agrees with the observational constraint of baryon ***,therefore,provides a scenario for phase transition gravitational waves(GWs)within the standard model of particle *** these background GWs could contribute dominantly to the recently claimed common-spectrum red noise from pulsar timing array(PTA)observations,the duration of this FoPT can be well constrained,and the associated primordial black holes are still allowed by current observations.

关键词： pulsar timing array QCD phase transition gravitational waves primordial black holes

QED effects on Kerr-Newman black hole shadows

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Chinese physics C 2025年第02期 185-196页

作者：元绍冰罗昶恺胡泽州张震宇陈斌 School of physics Peking University institute of Fundamental physics and Quantum Technology Ningbo University School of Physical Science and Technology Ningbo University Center for high energy physics Peking University

By incorporating first-order QED effects, we explored the shadows of Kerr-Newman black holes with a magnetic charge through the numerical backward ray-tracing method. Our investigation encompassed both the direct influence of the electromagnetic field on light rays and the distortion of the background spacetime metric due to QED corrections. We found that the area of the shadow increases with the QED effect, mainly owing to the fact that the photons travel more slowly in the effective medium, making them more susceptible to being trapped by the black hole.

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Calibration of the Solar X-ray Detector on-board the Macao Science Satellite-1B for Soft X-ray Detection

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Science China Earth Sciences 2025年第1期68卷 11-26页

作者： Man-Hei NG Xiaoping ZHANG Jianwu CHEN Yongqiang SHI Fuchang ZUO Wenxi PENG Weichun FU Liansheng LI Pengwei LUO Chi-Long TANG Guozheng ZHANG Zhiwu MEI Li WANG Cunhui LI Jiaming OU Yanyan Xu State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacao999078China Space Optoelectronic Measurement and Perception Laboratory Beijing Institute of Control EngineeringBeijing100190China institute of high energy physics Chinese Academy of SciencesBeijing100049China Science and Technology on Vacuum Technology and physics Laboratory Lanzhou Institute of PhysicsLanzhou730000China China National Space Administration(CNSA) Macao Center for Space Exploration and ScienceMacao999078China

The Solar X-ray Detector(SXD)on-board the Macao Science Satellite-1B(MSS-1B)was successfully launched via the Chinese Long March-2C rocket on 21 May 2023,and commenced operations in early June of the same *** MSS-1B/Soft X-ray Detection Units(SXDUs)employ two silicon drift detectors(SDDs),providing a wide range of energy spectra spanning from 0.7 to 24 ***,the SXDUs deliver a high-resolution capability of 0.14 keV@5.9 keV and operate with a time cadence of 1 ***,we perform thorough calibrations of the MSS-1B/SXDUs,employing a combination of ground experiments and *** addition,quantitative analysis comparing the flux measurements obtained by the MSS-1B/SXDUs to the data collected by the Geostationary Operational Environmental Satellite(GOES),provides compelling evidence of their ***,the preliminary spectral analysis results showcase the robustness and expected performance of the MSS-1B/SXDUs,unlocking their potential for facilitating the study of dynamic evolution of solar ***,the innovative MSS-1B/Solar X-ray Detector facilitates concurrent observations of solar soft and hard X-rays,thereby making valuable contributions to the advancements in solar research.

关键词： Macao Science Satellite-1B(MSS-1B) Calibration Solar X-Ray Detector Spectrometer Soft X-rays Solar flares Solar abundances

Pressure induced superconducting dome in LaNiGa_(2)

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Science China(physics,Mechanics & Astronomy) 2025年第2期68卷 161-166页

作者： Yanan Zhang Dajun Su Zhaoyang Shan Yunshu Shi Rui Li Jinyu Wu Zihan Yang Kaixin Ye Fei Zhang Yanchun Li Xiaodong Li Chao Cao Valentin Taufour Lin Jiao Michael Smidman Huiqiu Yuan Center for Correlated Matter and School of physics Zhejiang UniversityHangzhou 310058China Department of physics and Astronomy University of CaliforniaDavis 95616USA Beijing Synchrotron Radiation Facility institute of high energy physics Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Silicon and Advanced Semiconductor Materials Zhejiang UniversityHangzhou 310058China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

LaNiGa_(2)is a time-reversal symmetry breaking superconductor with symmetry protected band crossings,making it an ideal platform for investigating the interplay between unconventional superconductivity and electronic structure *** we present a transport study of LaNiGa_(2)under *** application of pressure to LaNiGa_(2)induces a significant enhancement of the superconducting transition temperature Tcat a pressure of 7 *** contrast,powder X-ray diffraction(XRD)results show no evidence of structural phase transitions up to 26.3 ***,the ratio of band diffusivity shows a sudden increase at around 7 GPa,suggesting possible pressure-induced changes in the electronic structure that are closely linked to the evolution of superconductivity.

关键词： high pressure superconductivity time-reversal breaking

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