Highlights
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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
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Experimental overview on the charmed baryon decays
Published: 2025-10-19
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Search for the lepton number violating process
${{\boldsymbol J}/{\boldsymbol\psi }{\bf\to}{\boldsymbol K}^{\bf +}{\boldsymbol K}^{\bf +}{\boldsymbol e}^{\bf -}{\boldsymbol e}^{\bf -}{\bf +}{\boldsymbol {c.c.}}}$ Published: 2025-10-19 -
A Numerical Study on Gauge Symmetry of Electroweak Amplitudes
Published: 2025-10-18
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Axial gravitational quasinormal modes of magnetically charged black holes
2025, 49(12): 125109-125109-13. doi: 10.1088/1674-1137/adff01Show AbstractIn this study, we consider axial perturbations on the magnetically charged string-inspired Euler-Heisenberg black hole. As axial metric perturbation decouples from axial electromagnetic perturbation, we mainly focus on axial gravitational perturbation. By using the Wentzel–Kramers–Brillouin (WKB) approximation and asymptotic iteration method (AIM), we perform a detailed analysis of the gravitational quasinormal frequencies by varying the characteristic parameters of gravitational perturbation and black holes. The results obtained through the AIM are consistent with those obtained using the WKB method, including the results extracted from the time-domain profiles. The greybody factor is calculated using the WKB method. The effects of
$ Q_m $ , ϵ, and multipole number l on the greybody factor are also studied. -
On the pole trajectory of the subthreshold negative parity nucleon with varying pion masses
2025, 49(12): 123103-123103-12. doi: 10.1088/1674-1137/adfa02Show AbstractWe study the pole trajectory of the recently established subthreshold negative-parity nucleon pole, namely the
$N^*(920)$ , with varying pion masses in the scheme of linear σ model with nucleons, using the$N/D$ unitarization method. We find that, as the pion mass increases, the pole moves toward the real axis. For larger pion masses, at tree level, the pole falls to a specific point on u-channel cut and crosses to the adjacent Riemann sheet defined by the logarithmic u-channel cut. At the one-loop level, the pole does not meet the u-cut up to$m_\pi=0.36$ GeV. We also re-examined the σ pole trajectory and found it to be in good agreement with the Roy equation analysis result. -
Study of χcJ (J = 0,1,2) decays to light meson pairs based on SU(3) flavor symmetry/breaking analysis
2025, 49(12): 123106-123106-13. doi: 10.1088/1674-1137/adff00Show AbstractBased on available experimental results on
$ \chi _{cJ}(J=0,1,2) $ decays, we investigated the$ \chi_{cJ}\to PP $ ,$ VV $ ,$ PV $ , and$ PT $ decays using the SU(3) flavor symmetry/breaking approach, where P, V, and T denote light pseudoscalar, vector, and tensor mesons, respectively. With the decay amplitude relations determined by SU(3) flavor symmetry/breaking, we present the branching ratios for all$ \chi_{cJ}\to PP $ and$ \chi_{cJ}\to VV $ modes, including those without experimental data. While theoretical considerations strongly suppress or even forbid most$ \chi_{cJ}\to PV $ and$ PT $ decays, we also provide quantitative predictions constrained by existing experimental data. Our results are expected to be accessible in future experiments at BESIII and the planned Super Tau-Charm Facility.
Current Issued
2025 Vol. 49, No. 10
Published: 25 September 2025
Published: 25 September 2025
Archive
IF: 3.1
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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
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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
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