Highlights
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CP violations and branching ratios for Bc+→ D(s)+π+π−(K+K−) from interference of the vector mesons in Perturbative QCD
2025, 49(9): 093108. doi: 10.1088/1674-1137/add523
Within the framework of the perturbative QCD approach utilizing$k_T$ factorization, we investigated the CP violation and branching ratios in the decay processes of$B_{c}^{+}\to D_{(s)} ^{+}V(V\rightarrow\pi^{+}\pi^{-})$ and$B_{c}^{+}\to D_{(s)}^{+}V(V\rightarrow K^{+}K^{-})$ , where V denotes the three vector mesons$\rho^0$ , ω, and ϕ. During the$V\to \pi^+\pi^-$ and$V\to K^+K^-$ decay processes, we incorporated the$\rho^{0}-\omega-\phi$ mixing mechanism to describe the amplitudes of these quasi-two-body decays. Within the interference region of the three vector particles, we observed distinct changes in both CP violations and branching ratios. Furthermore, our study presents evidence for local CP violations and branching ratios that warrants further experimental investigation. -
Predictions of unknown masses using a feedforward neural network
2025, 49(9): 094111. doi: 10.1088/1674-1137/add10a
In this study, a feedforward neural network (FNN) approach is employed to optimize three local mass models (GK, GKs, and GK+J). We find that adding physical quantities related to the pairing effect in the input layer can effectively improve the prediction accuracy of local models. For the known masses in AME2012, the FNN reduces the root-mean-square deviation between theory and experiment for the three mass models by 11 keV, 32 keV, and 623 keV. Among them, the improvement effect of the light mass region with mass number between 16 and 60 is better than that of medium and heavy mass regions. The approach also has good optimization results when extrapolating AME2012 to AME2020 and the latest measured masses after AME2020. Based on the improved mass data, the separation energies for single- and two-proton (neutron) emissions and α-decay energies are obtained, which agree well with the experiment. -
A three-body form factor at sub-leading power in the high-energy limit: planar contributions
2025, 49(9): 093102. doi: 10.1088/1674-1137/addcc7
We analyzed two-loop planar contributions to a three-body form factor at next-to-leading power in the high-energy limit, where the masses of the external particles are much smaller than their energies. Calculations were performed by exploiting differential equations for the expansion coefficients, both to facilitate linear relations among them and to derive their analytic expressions. The results are expressed in terms of generalized polylogarithms involving a few simple symbol letters. Our method can readily be applied to calculations of non-planar contributions as well. Our results provide crucial information for establishing sub-leading factorization theorems for massive scattering amplitudes in the high-energy limit.
Just Accepted
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Search for the lepton number violation decay ω→π+π+e−e−+c.c.
Published: 2025-09-18, doi: 10.1088/1674-1137/ade955
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Flavor physics at the CEPC: a general perspective
Published: 2025-09-18, doi: 10.1088/1674-1137/adf1f0
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Improvements of time-of-flight detector utilizing a thin foil and crossed static electric and magnetic fields
Published: 2025-09-18, doi: 10.1088/1674-1137/ade95b
Recent
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Unveiling the electromagnetic structure and intrinsic dynamics of spin-
$ \bf{3/2}$ hidden-charm pentaquarks: A comprehensive QCD analysis2025, 49(10): 103106-103106-16. doi: 10.1088/1674-1137/ade95aShow AbstractIn 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. -
Characterizing the CJPL’s site-specific neutrino floor as the neutrino fog boundary
2025, 49(10): 103001-103001-8. doi: 10.1088/1674-1137/ade65eShow AbstractThe neutrino floor, a theoretical sensitivity limit for dark matter (DM) direct detection, is being redefined as the boundary of a dynamic ''neutrino fog,'' where neutrino signals become inevitable, obscuring DM detection due to statistical and systematic uncertainties. This study provides the first site-specific analysis of the neutrino floor at China Jinping Underground Laboratory (CJPL), leveraging its unique geographic and environmental characteristics. We quantify how CJPL’s suppressed atmospheric neutrino flux (approximately 30% lower than that of Laboratori Nazionali del Gran Sasso (LNGS)) reshapes the neutrino floor, thereby enabling improved sensitivity to high-mass WIMPs (mass > 10 GeV). Using a gradient-based framework, we derive the CJPL’s neutrino floor and estimate the detection prospects for the PandaX-xT experiment. Our results demonstrate that a 500 tonne-year exposure with PandaX-xT could reach the floor, probing spin independent cross-sections down to
$ \sigma_{n}\sim 3\times 10^{-49}\; {\rm{cm}}^2$ at a DM mass of 70 GeV/c2. -
Revisiting the deuteron mass radius via near-threshold ρ0, ω, and ϕ meson photoproduction
2025, 49(10): 103105-103105-9. doi: 10.1088/1674-1137/ade1c9Show AbstractWe present a comprehensive analysis of near-threshold photoproduction of
$\rho^0$ , ω, and ϕ mesons on a deuterium target, utilizing published datasets from DESY and SLAC for$\rho^0$ and ω production, as well as data from the LEPS and CLAS Collaborations for ϕ production. In extracting the deuteron mass radius, we adopt a dipole parameterization for the scalar gravitational form factor, which effectively captures the$|t|$ -dependence of the differential cross sections associated with vector meson photoproduction. In addition, results from alternative commonly used form factor parameterizations are considered and compared. By employing the vector meson dominance (VMD) framework and invoking low-energy Quantum Chromodynamics (QCD) theorems, we extract the deuteron mass radius from near-threshold photoproduction data of$\rho^0$ , ω, and ϕ mesons. The mass radii obtained from the various datasets are found to be consistent within statistical uncertainties, yielding an average value of$2.03 \pm 0.13$ fm under the dipole form assumption. We also provide a detailed discussion of the sensitivity of the extracted radius to the choice of gravitational form factor models. Our result represents a significant improvement in precision compared to earlier estimates based solely on ϕ meson photoproduction, offering new constraints for theoretical models of nuclear structure and deepening our understanding of the mass distribution within the deuteron.
Current Issued
2025 Vol. 49, No. 9
Published: 05 September 2025
Published: 05 September 2025
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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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