Highlights
-
Moments from momentum derivatives in lattice QCD
2025, 49(10): 101001. doi: 10.1088/1674-1137/aded04
We show that the traditional moments approach in lattice quantum chromodynamics based on operator product expansion can be realized such that it utilizes derivatives in momentum rather than in distance. This avoids power divergent mixings, and thus allows to extract moments order by order to all orders in principle. Further, by exploiting the symmetry of lattice matrix elements, we can determine the even and odd moments separately. As a demonstrative example, we determine the first three moments beyond the tensor charge$ g_T$ of the isovector quark transversity distribution in the nucleon. -
Improvements of time-of-flight detector utilizing a thin foil and crossed static electric and magnetic fields
2025, 49(10): 104001. doi: 10.1088/1674-1137/ade95b
We developed a time-of-flight (TOF) detector with a thin foil for mass measurements of unstable nuclei using the Rare-RI Ring at the RIKEN RI beam factory. Compared to the previous design, the developed TOF detector employed modified electrodes, and its static electric and magnetic fields were reduced. We improved the detection efficiency and stability of operation. Its specification and design were finally fixed for mass measurements. We also developed a position-sensitive detector based on the principles of the TOF detector. This study utilized larger microchannel plate (MCP) detectors than those of the prototype. By improving acceptance, we demonstrated the performance of the position-sensitive detector with very low material thickness. -
Unveiling the electromagnetic structure and intrinsic dynamics of spin-3/2 hidden-charm pentaquarks: A comprehensive QCD analysis
2025, 49(10): 103106. doi: 10.1088/1674-1137/ade95a
In this study, we investigate the electromagnetic properties$ - $ specifically, the magnetic dipole, electric quadrupole, and magnetic octupole moments$ - $ of six hidden-charm pentaquark states:$ [u u][d c] \bar c $ ,$ [dd][u c] \bar c $ ,$ [u u][s c] \bar c $ ,$ [dd] [s c] \bar c $ ,$ [s s][u c] \bar c $ , and$ [s s][d c] \bar c $ . Employing the framework of QCD light-cone sum rules and utilizing two distinct diquark-diquark-antiquark interpolating currents, we focus on pentaquark configurations with spin-parity quantum numbers$ \rm{\mathit{J}}^{\rm{\mathit{P}}}=3/2^- $ . The numerical results demonstrate significant deviations between the magnetic dipole moments predicted using different diquark-diquark-antidiquark structures. These results suggest that multiple pentaquark states with identical quantum numbers and quark constituents may exhibit distinct magnetic dipole moments, depending on their internal quark configurations. The obtained electromagnetic moments, particularly the variations in magnetic dipole moments, may provide insights into the internal structure of hidden-charm pentaquark states.
Just Accepted
More >
Published: 2025-10-08
Published: 2025-10-08
Published: 2025-09-30
Recent
More >
-
Study of
${\boldsymbol\tau\rightarrow {\boldsymbol e M^+ M^-}}$ decays in N-B-LSSM2025, 49(11): 113110-113110-21. doi: 10.1088/1674-1137/adec4cShow AbstractWithin the framework of the next-to-minimal supersymmetric (SUSY) extension of the Standard Model (SM) with a local B-L gauge symmetry (N-B-LSSM), we study lepton flavor violating (LFV)$ \tau\rightarrow e M^+ M^- $ decays:$ \tau \rightarrow e \pi^+\pi^- $ ,$ \tau \rightarrow e \pi^+K^- $ , and$ \tau \rightarrow e K^+K^- $ . Based on the latest experimental data, the influence of different sensiäuser","");'> R. Gernhäuser, Bing-shui Gao, C. J. Griffin, A. Gumberidze, E. Haettner, R. Heß, P.-M. Hillenbrand, P. Kienle, W. Korten, Ch. Kozhuharov, N. Kuzminchuk, S. Litvinov, E. B. Menz, T. Morgenroth, C. Nociforo, F. Nolden, N. Petridis, U. Popp, S. Purushothaman, R. Reifarth, C. Scheidenberger, U. Spillmann, M. Steck, Th. Stöhlker, Y. K. Tanaka, S. Trotsenko, L. Varga, Meng Wang, H. Weick, P. J. Woods, T. Yamaguchi, Yu-hu Zhang, Jian-wei Zhao2025, 49(11): 114001-114001-10. doi: 10.1088/1674-1137/ade956Show AbstractThe measurement of the bound-state$ \beta $ decay of 205Tl at the Experimental Storage Ring (ESR) at GSI, Darmstadt, has recently been reported, with substantial impact on the use of 205Pb as an early Solar System chronometer and on the low-energy measurement of the solar neutrino spectrum via the LOREX project. Owing to the technical challenges in producing a high-purity 205Tl81+ secondary beam, a robust statistical method was developed to estimate the variation in the contaminant 205Pb81+ produced in the fragmentation reaction, which was subsequently transmitted and stored in the ESR. Here, we show that Bayesian and Monte Carlo methods produce comparable estimates for the contaminant variation, each with unique advantages and challenges given the complex statistical problems for this experiment. We recommend the adoption of such methods in future experiments that exhibit unknown statistical fluctuations.- Study of
${\boldsymbol\tau\rightarrow {\boldsymbol e M^+ M^-}}$ decays in N-B-LSSM2025, 49(11): 113110-113110-21. doi: 10.1088/1674-1137/adec4cShow AbstractWithin the framework of the next-to-minimal supersymmetric (SUSY) extension of the Standard Model (SM) with a local B-L gauge symmetry (N-B-LSSM), we study lepton flavor violating (LFV)$ \tau\rightarrow e M^+ M^- $ decays:$ \tau \rightarrow e \pi^+\pi^- $ ,$ \tau \rightarrow e \pi^+K^- $ , and$ \tau \rightarrow e K^+K^- $ . Based on the latest experimental data, the influence of different sensitive parameters on the branching ratios is considered. It can be seen from the numerical analysis that the main sensitive parameters and LFV sources are non-diagonal elements corresponding to the initial and final leptons. This work can provide a basis for discovering the existence of new physics (NP).- Corrected first law of thermodynamics for dynamical regular black holes
2025, 49(12): 125104-125104-11. doi: 10.1088/1674-1137/adf541Show AbstractIn this study, we establish the corrected first law of thermodynamics for dynamical regular black holes on both the event and apparent horizons. We found that the temperature of dynamical regular black holes derived from the traditional first law differs from that obtained through other approaches. This indicates that, similar to static cases, the first law of thermodynamics requires correction. We derived the corrected first law of thermodynamics from the Einstein field equations. Our analysis reveals that the corrected factor originates from the fact that the$T_v^v$ component of the energy-momentum tensor depends on the black hole mass. This dependence implies that the mass of a regular black hole can no longer be directly identified as the internal energy, leading to corrections of the first law of thermodynamics.Current Issued
2025 Vol. 49, No. 10
Published: 25 September 2025Archive - Study of
IF: 3.1
Monthly issued, founded in 1977
Sponsored by:
ISSN 1674-1137 CN 11-5641/O4
Original research articles, Ietters and reviews Covering theory and experiments in the fieids of
- Particle physics
- Nuclear physics
- Particle and nuclear astrophysics
- Cosmology
Author benefits
- A SCOAP3 participating journal - free Open Access publication for qualifying articles
- Average 24 days to first decision
- Fast-track publication for selected articles
- Subscriptions at over 3000 institutions worldwide
- Free English editing on all accepted articles
News
- Chinese Physics C Outstanding Reviewer Award 2023
- Impact factor of Chinese Physics C is 3.6 in 2022
- 2022 CPC Outstanding Reviewer Awards
- The 2023 Chinese New Year-Office closure
- 《Chinese Physics C》BEST PAPER AWARDS 2022
Cover Story
- Cover Story (Issue 9, 2025): Precise measurement of χc0 resonance parameters and branching fractions of χc0,c2→π＋π－/ K+K-
- Cover Story (Issue 8, 2025) A Novel Perspective on Spacetime Perturbations: Bridging Riemannian and Teleparallel Frameworks
- Cover Story (Issue 7, 2025) Evidence of the negative parity linear chain states in 16C
- Cover Story (Issue 1, 2025) Comments on Prediction of Energy Resolution inthe JUNO Experiment
- Cover Story (Issue 12, 2024) | Doubly heavy meson puzzle: precise prediction of the mass spectra and hadronic decay with coupled channel effects to hunt for beauty-charm family
Advertising
