Highlights
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Search for the leptonic decay
${\boldsymbol D^{\bf +}{\bf\to}{\boldsymbol e}^{\bf +}\boldsymbol\nu_{\boldsymbol e}}$ 2025, 49(6): 063001. doi: 10.1088/1674-1137/adc11d
We search for the leptonic decay$ D^+\to e^+\nu_{e} $ using an$ e^+e^- $ collision data sample with an integrated luminosity of 20.3 fb$ ^{-1} $ collected with the BESIII detector at a center-of-mass energy of 3.773 GeV. Significant signal is not observed, and an upper limit on the branching fraction of$ D^+\to e^+\nu_{e} $ is set as$ 9.7 \times 10^{-7} $ , at a confidence level of 90%. Our upper limit is an order of magnitude smaller than the previous limit for this decay mode. -
Note on single-trace EYM amplitudes with MHV configuration
2025, 49(6): 063105. doi: 10.1088/1674-1137/adc189
In the maximally-helicity-violating (MHV) configuration, tree-level single-trace Einstein-Yang-Mills (EYM) amplitudes with one or two gravitons have been shown to satisfy a formula in which each graviton splits into a pair of collinear gluons. In this study, we extend this formula to more general cases. We present a general formula that expresses tree-level single-trace MHV amplitudes in terms of pure gluon amplitudes. In this formula, each graviton turns into a pair of collinear gluons. -
Configuration-interaction relativistic Hartree-Fock model
2025, 49(6): 064104. doi: 10.1088/1674-1137/adbdba
The configuration interaction relativistic Hartree-Fock (CI-RHF) model is developed in this work. Compared to the conventional configuration interaction shell model (CISM), the CI-RHF model can be applied to study the structural properties of a wide range of nuclei without readjusting any parameters, as the effective Hamiltonian for different model spaces can be deduced consistently from a universal density-dependent Lagrangian based on the Hartree-Fock single-particle basis. The convergence of intermediate-state excitations has been examined in evaluating the effective interactions, and the core-polarization effects are illustrated, taking$ ^{18} {\rm{O}}$ as an example. Employing the CI-RHF model, both the bulk properties and low-lying spectra of even-even nuclei$^{18-28} {\rm{Ne}}$ have been well-reproduced with the model space restricted to the$ sd $ shell. Studies of the isotopic evolution concerning charge radii and low-lying spectra highlight the shell closure at$ N=14 $ for neon isotopes. Furthermore, the cross-shell calculations extending from the$ sd $ to$ pf $ shell successfully reproduced the low-lying spectra of$ ^{30} {\rm{Ne}}$ and$ ^{32} {\rm{Ne}}$ . Notably, remarkably low excitation energies$ E(2^{+}_{1}) $ of$ ^{30} {\rm{Ne}}$ suggest the disappearance of the conventional magicity$ N=20 $ .
Just Accepted
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Gravitationally deformed polytropic models in extended teleparallel gravity and influence of decoupling parameters on constraining mass-radius relation
Published: 2025-06-26
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The role and contribution of resonance effect for the decay process of
${ \bar {\boldsymbol B}^{\bf 0}_{\boldsymbol s} \boldsymbol\rightarrow \boldsymbol\pi^{+}\boldsymbol\pi^{-}{\boldsymbol P}}$ Published: 2025-06-26 -
An Unitary Coupled-Channel Approach to J/ψ Radiative decay to Pseudoscalar Pairs
Published: 2025-06-24
Recent
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Nature of X(3872) from recent BESIII data: considering the universal feature of an S-wave threshold resonance
2025, 49(7): 073103-073103-7. doi: 10.1088/1674-1137/adcb29Show AbstractWe analyze the recent data from the BESIII collaboration on the
$ X(3872) $ state in the$ J/\psi\pi^+\pi^- $ and$ D^0\bar{D}^0\pi^0 $ decay channels. The quantum number and mass of the$ X(3872) $ state allow us to exploit the universal feature of the very near-threshold$ D\bar D^* $ scattering in the S wave. The analysis of$ J/\psi\pi^+\pi^- $ and$ D^0\bar{D}^0\pi^0 $ data separately, as well as the combined analysis of these data together, all support the conclusion that$ X(3872) $ is an extremely weakly bound charm meson molecule. -
Effect of pressure anisotropy on quark star structure in the Starobinsky model
2025, 49(7): 074111-074111-13. doi: 10.1088/1674-1137/adcf8eShow AbstractThis paper discusses the structure and stability of quark stars (QSs) made of interacting quark matter. The discussion accounts for color superconductivity and perturbative QCD corrections. By combining this EoS with the Tolman-Oppenheimer-Volkoff (TOV) equations, we explore the mass-radius (
$ M-R $ ) relations of QSs. The analysis is conducted within the framework of$ R^2 $ gravity, where the model of gravity is described by$ f(R) = R + a R^2 $ . Our primary goal is to investigate how variations in the$ R^2 $ gravity parameter a affect the mass-radius and mass-central density ($ M-\rho_c $ ) relationships of QSs. Furthermore, we study the dynamical stability of these stars by analyzing the impact of the anisotropy parameter β and interaction parameter λ derived from the EoS on their stability. Our results demonstrate that the presence of pressure anisotropy is crucial for increasing the maximum mass of QSs. The results hint at the existence of super-massive pulsars. These findings are in agreement with recent astronomical observations, which suggest the possibility of neutron stars with masses exceeding$ 2M_{\odot} $ . -
Cross sections of the 148Sm(n,α)145Nd reaction in the 4.8–5.3 MeV neutron energy range
2025, 49(7): 074007-074007-6. doi: 10.1088/1674-1137/add09aShow AbstractThe cross sections of the 148Sm(n,α)145Nd reaction were measured for the first time at neutron energies ranging from 4.8 to 5.3 MeV. The experiment was carried out on the Van de Graaff accelerator EG–5 at the Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research. Fast neutrons were produced via the 2H(d,n)3He reaction with a deuterium gas target. A twin gridded ionization chamber was used as the charged particle detector, with back–to–back 148Sm samples mounted on tantalum backings at the common cathode. The absolute neutron flux was measured using the 238U3O8 sample. The obtained cross section data were compared with those from existing nuclear data libraries and theoretical calculations using the TALYS–1.96 code. The present results for the 148Sm(n,α)145Nd reaction are expected to resolve discrepancies among various nuclear evaluation data.
Current Issued
2025 Vol. 49, No. 6
Published: 29 May 2025
Published: 29 May 2025
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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
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- Cosmology
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- Cover Story (Issue 11, 2024) ｜ Form factor for Dalitz decays from J/ψ to light pseudoscalars
- Cover Story (Issue 3, 2024) | First measurement of the ground-state mass of 22Al helps to evaluate the ab-initio theory
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