Impact factor of Chinese Physics C is 3.6 in 2023 Impact factor of Chinese Physics C is 3.6 in 2022 2021 Impact Factor 2.944
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  • Planar property and long-range azimuthal correlation in e+e– annihilation
    Xuan Chen, Yuesheng Dai, Shi-Yuan Li, Zong-Guo Si, Huiting Sun
    2026, 50(4): 043108. doi: 10.1088/1674-1137/ae3b37
    The $ e^+e^- $ annihilation of unpolarized beams is free from initial hadron states or initial anisotropy around the azimuthal angle. Hence, it is ideal for studying the correlations of dynamical origin via final state jets. We investigate the planar properties of multi-jet events employing the relevant event-shape observables at next-to-next-to-leading order ($ {\cal{O}} $($ \alpha_{s}^{3} $)) in perturbative Quantum Chromodynamics (QCD). In particular, the azimuthal angle correlations on the long pseudo-rapidity (polar angle) range (Ridge correlation) between the inclusive jet momenta are calculated. We demonstrate that the significant planar properties and the strong correlations as the consequence are natural results of the energy-momentum conservation of the perturbative QCD radiation dynamics. Our study provides benchmarks of a hard strong interaction background for investigating the collective and/or thermal effects via the Ridge-like correlation observables for various scattering processes.
  • Functional renormalization group study of ρ meson condensate at a finite isospin chemical potential in the quark meson model
    Mohammed Osman, Defu Hou, Wentao Wang, Hui Zhang
    2026, 50(4): 043102. doi: 10.1088/1674-1137/ae2f51
    We investigated the effect of an isospin chemical potential ($ \mu_{I} $) within the quark-meson model, which approximates quantum chromodynamics (QCD) by modeling low-energy phenomena such as chiral symmetry breaking and phase structure under varying conditions of temperature and chemical potential. Using the functional renormalization group (FRG) flow equations, we calculated the phase diagram in the chiral limit within the two-flavor quark-meson model in a finite $ \mu_{I} $ with ρ vector meson interactions. Fluctuation effects significantly decrease the critical chemical potential from the mean-field (MF) value $\mu_{I,{\rm MF}} \gt m_\rho$ to a lower value at which the ρ vector meson condensates alongside the chiral condensate once the isospin chemical potential exceeds the critical value $ \mu_{I}^{{\rm{crit}}} $. This ρ condensation was investigated numerically for different meson coupling strengths. The ρ meson dominated region is delineated from other phases by a second-order phase transition at lower $ \mu_{I} $ and a first-order transition at slightly higher $ \mu_{I} $.
  • Dynamical system and statefinder analysis of cosmological models in f(T, B) gravity
    Jianwen Liu, Fabao Gao, Aqeela Razzaq
    2026, 50(4): 045104. doi: 10.1088/1674-1137/ae368c
    This study systematically investigates the cosmological dynamics of two well-motivated functional forms in $f(T,B)$ gravity within a flat Friedmann-Lemaître-Robertson-Walker (FLRW) universe. Here, T denotes the torsion scalar and B the boundary term, with the special choice $f(T,B) = - T + B$ reducing to the action of general relativity. We focus on a multiplicative power-law model $f(T,B) = c_1 T^\alpha B^\beta$ and an additive mixed power-law model $f(T,B) = c_2 T^\alpha + c_3 B^\beta$. Using dynamical system techniques, we construct autonomous systems and identify de Sitter attractors that naturally explain late-time cosmic acceleration. Analytical stability conditions for these fixed points are derived, and numerical simulations reveal characteristic evolutionary patterns, such as spiral trajectories and damped oscillations, in the additive mixed power-law model. Furthermore, statefinder diagnostics are applied to quantitatively distinguish these models from the standard ΛCDM paradigm and other dark energy scenarios. The results indicate that $f(T,B)$ gravity offers a theoretically consistent and observationally distinguishable geometric framework for explaining cosmic acceleration, presenting a compelling alternative to conventional dark energy models.
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  • Photonuclear reactions on stable isotopes of cadmium and tellurium at bremsstrahlung end-point energies of 10-23 MeV
    F.A. Rasulova, A.A. Kuznetsov, V.O. Nesterenko, J.H. Khushvaktov, S.I. Alekseev, N.Yu. Fursova, A.S. Madumarov, I. Chuprakov, S.S. Belyshev, N.V. Aksenov
    Published: 2026-04-20
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    This work used the γ-activation approach to conduct tests at bremsstrahlung end-point energies of 10-23 MeV utilising the MT-25 microtron beam. The experimental values of relative yields and cross sections per equivalent quantum of photonuclear reactions on stable isotopes of cadmium and tellurium were compared to theoretical calculations obtained from TALYS-2.0 using the default parameters and a combined model of photonucleon reactions (CMPR). The inclusion of isospin splitting in the combined model of photonucleon reactions allows for the description of experimental data on proton escape reactions with energies ranging from 17 to 23 MeV. As a result, isospin splitting must be taken into consideration in order to accurately describe the decay of the giant dipole resonance. For Cd isotopes, essential discrepancies of yet unclear origin between theory (TALYS 2.0 and CMPR) and experimental data are found in the neutron channel.
  • New Evaluation and Validation Towards Neutron Reaction Data on Chromium Isotopes at Incident Energies Below 200 MeV
    Wen-Ye Wang, Yin-Lu Han, Ji-Min Wang, Huan-Yu Zhang, Yuan Tian, Xi Tao, Hai-Cheng Wu, Yong-Li Jin, Bo-Yu Tan, Yue Zhang, Zhao-Hui Wang, Zhi-Gang Ge, Rui-Rui Xu
    Published: 2026-04-20
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    Chromium (Cr) serves as an indispensable structural material in accelerator-driven systems (ADS) and Generation IV reactors, where the precision of its neutron reaction data is important for ensuring reactor safety and operational reliability. However, significant discrepancies persist in both experimental data and evaluations for key reaction channels, such as $(n, p)$ and $(n, 2n)$, across the chromium isotopes $^{50,52,53,54}{\rm{Cr}}$. This study presents a novel evaluation and validation of neutron reaction data for these isotopes at incident energies below 200 MeV, incorporating 571 experimental datasets from EXFOR covering cross sections, angular distributions, energy spectra, and double - differential cross sections. The newly evaluated data provide more reliable key cross sections: the $^{52}{\rm{Cr}}(n,2n)$ cross section resolves discrepancies and supports H.,Liskien et al.'s data; the $^{52}{\rm{Cr}}(n, p)$ cross section aligns well with natural chromium data across all energies, and is validated by competition analysis. The results accurately replicate double differential cross sections and energy spectra, with neutron emission spectra matching experimental peaks and charged - particle spectra agreeing with measurements for $^{50,52}{\rm{Cr}}$. Moreover, the abundance - weighted sum of $(n, p)$ and $(n, 2n)$ cross sections for chromium isotopes agrees well with natural chromium data, confirming systematic consistency. All evaluations are validated using 62 ICSBEP 2014 benchmark facilities with $k_{{\rm{eff}}}$ sensitivity to chromium neutron data > 1%. For the PMI002_01 experiment, calculated $k_{{\rm{eff}}}$ decreased by $\sim 1000$ pcm relative to CENDL - 3.2, improving agreement with the benchmark; in the OKTAVIAN shielding benchmark, the neutron leakage spectrum also produces experiments well.
  • Reconciling the ACT preference in f(T) gravity: inflation and reheating constraints
    Feng-Yi Zhang, Rongrong Zhai, Li-Yang Chen
    2026, 50(6): 1-13. doi: 10.1088/1674-1137/ae5806
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    Recent measurements from the Atacama Cosmology Telescope (ACT) indicate a preference for a slightly bluer scalar spectral index compared to Planck-only analyses, placing canonical inflationary models in General Relativity (GR) under mild pressure. We demonstrate that f(T) gravity systematically accommodates these dataset-dependent preferences by suppressing the tensor-to-scalar ratio in monomial and hilltop potentials, and by shifting the spectral index of E-models toward the ACT-favored region. Incorporating Big Bang Nucleosynthesis bounds, we break the degeneracy between the inflationary e-folding number and the post-inflationary thermal history. A direct side-by-side comparison reveals that reconciling models such as the Starobinsky potential with ACT data in GR strictly necessitates a non-standard, stiff (kinetic-dominated) reheating phase. In contrast, torsional corrections in f(T) gravity significantly enlarge the viable parameter space, relaxing these stringent phenomenological requirements and establishing a coherent framework that jointly constrains CMB observables and reheating dynamics.
Current Issued
Chinese Physics C
2026 Vol. 50, No. 5
Published: 28 April 2026
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Chinese Physics C
IF: 3.1

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ISSN 1674-1137 CN 11-5641/O4

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