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
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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. -
Two-body strong decays of the hidden-charm tetraquark molecular states via QCD sum rules
2025, 49(10): 103104-103104-11. doi: 10.1088/1674-1137/add912Show AbstractIn this study, we extend our previous study on the
$ D^*\bar{D}^* $ molecular states with$ J^{PC}=0^{++} $ ,$ 1^{+-} $ , and$ 2^{++} $ to investigate their two-body strong decays via the QCD sum rules based on rigorous quark-hadron duality. We obtain the partial decay widths and, therefore, the total widths of the ground states with$ J^{PC}=0^{++} $ ,$ 1^{+-} $ , and$ 2^{++} $ , which indicate that it is reasonable to assign$ X_2(4014) $ as the$ D^*\bar{D}^* $ tetraquark molecular states with$ J^{PC}=2^{++} $ . -
Inelastic heavy quarkonium photoproduction in p-p and Pb-Pb collisions at LHC energies
2025, 49(10): 103103-103103-20. doi: 10.1088/1674-1137/ade1caShow AbstractWe study the inelastic charmonium (
$ J/\psi $ ,$ \psi(2S) $ ) and bottomonium ($ \Upsilon(nS) $ ) photoproduction and fragmentation processes in p-p and$ \rm Pb$ -$\rm Pb$ collisions at LHC energies, where the ultra-incoherent photon emission is included. Using the NRQCD factorization approach, an exact treatment is developed. This approach recovers the Weizsäcker-Williams approximation (WWA) near the$ Q^{2}\sim0 $ region, where the Martin-Ryskin and BCCKL methods are used to avoid double counting. We calculated the$ Q^{2} $ , y, z,$ \sqrt{s} $ , and$ p_{T} $ dependent and total cross sections. Inelastic photoproduction and fragmentation were observed to contribute to heavy quarkonium production, particularly at large$ p_{T} $ . In addition, the contribution of the ultra-incoherent photon channel, which increases rapidly with quarkonium mass, is significant and begins to dominate the photoproduction processes for large$ p_{T} $ . We also obtained the complete WWA validity scopes of inelastic heavy quarkonium photoproduction in heavy-ion collisions. The WWA had high accuracy at high energies and for$\rm Pb $ -$\rm Pb $ collisions. However, current photon spectra are derived beyond the WWA scope, and double counting can occur when considering different channels simultaneously.
Current Issued
2025 Vol. 49, No. 9
Published: 05 September 2025
Published: 05 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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