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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  • The forward-backward asymmetry induced CP asymmetry in ${{\overline{B}}^{0}\rightarrow K^{-}\pi^{+}\pi^{0}}$ in phase space around the resonances ${{\overline{K}}^{*}(892)^{0}}$ and ${{\overline{K}}^{*}_{0}(700)}$
    Jian-Yu Yang, Yu-Jie Zhao, Jing-Juan Qi, Zhen-Hua Zhang
    2026, 50(5): 053102-053102-8. doi: 10.1088/1674-1137/ae39cc
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    The interference between amplitudes corresponding to different intermediate resonances plays an important role in generating large CP asymmetries in the phase space in multi-body decays of bottom and charmed mesons. In this study, we examine the CP violation in the decay channel $ {\overline{B}}^{0}\rightarrow K^{-}\pi^{+}\pi^{0} $ in the phase-space region where the intermediate resonances $ \overline{K}^{*}(892)^{0} $ and $ {\overline{K}^{*}_{0}(700)} $ dominate. In particular, the forward-backward asymmetry (FBA) and the CP asymmetry induced by FBA (FB-CPA), which are closely related to the interference effects between the two aforementioned resonances, are investigated. The nontrivial correlation between FBA and FB-CPA is analyzed. The analysis indicates that FB-CPAs around the resonance $ \overline{K}^{*}(892)^{0} $ can be as large as approximately 35%, which can be potentially accessible by Belle and Belle-II collaborations in the near future.
  • Collective states, single-particle states, and ''stapler'' mechanism in 117In
    Hong-Fei Bai, Shou-Yu Wang, Xiao-Guang Wu, Wen-Zheng Xu, Wen-Biao Zeng, Zhi-Quan Li, Chen Liu, Hui Jia, Bin Qi, En-Hong Wang, Guang-Sheng Li, Yun Zheng, Cong-Bo Li, Shuo Wang, Da-Peng Sun, Xing-Chi Han, Hong-Yi Zhang, Nai-Bo Zhang
    2026, 50(5): 054001-054001-10. doi: 10.1088/1674-1137/ae38c4
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    High-spin states of 117In are studied through the incomplete fusion reaction induced by 7Li with 116Cd. A total of 19 new levels and 22 new transitions are observed. A pair of signature partner bands with the $ \pi (g_{7/2},d_{5/2})$ configuration is identified. The single-particle states are described through shell-model calculations. The dipole band with the configuration of $ \pi g_{9/2}^{-1} \otimes \nu (h_{11/2})^2$ is proposed as a ''stapler'' band based on the calculations of tilted axis cranking covariant density functional theory. The ''stapler'' mechanism in In isotopes is systematically investigated. The present study reveals the diversity of excitation modes in 117In.
  • Warm inflation in f (Q) gravity
    Tuhina Ghorui, Prabir Rudra, Farook Rahaman, Behnam Pourhassan
    2026, 50(5): 055103-055103-15. doi: 10.1088/1674-1137/ae3e5a
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    We investigate warm inflation in the framework of $f(Q)$ gravity within a Friedmann-Robertson-Walker spacetime. Unlike cold inflation, where the inflaton evolves in isolation, warm inflation features continuous interaction between the inflaton field and radiation throughout the inflationary epoch, facilitating energy transfer through dissipative processes and maintaining thermal equilibrium. In our novel approach, we employ $f(Q)$ dark energy as the driving mechanism for warm inflation, leveraging the geometric degrees of freedom associated with non-metricity as dynamical variables. We derive the field equations using slow-roll approximations and analyze two specific $f(Q)$ models: a power-law form $f(Q) = Q + mQ^n$ and logarithmic form $f(Q) = mQ\ln(nQ)$. Our analysis focuses on the high-dissipative regime, where thermal fluctuations dominate over quantum fluctuations. We compute key inflationary observables, including the scalar spectral index $n_s$, tensor-to-scalar ratio $r$, and slow-roll parameters. Our results demonstrate that $f(Q)$ dark energy successfully drives warm inflation while satisfying essential physical conditions: initial dominance of $f(Q)$ energy density over radiation density, and thermal fluctuations exceeding quantum fluctuations ($T \gt H$). As inflation progresses, energy transfers from the geometric $f(Q)$ sector to radiation, eventually bringing both densities to comparable levels near inflation's end. Importantly, our computed values align well with current observational constraints from Planck and BICEP/Keck: $n_s = 0.965 \pm 0.004$ and $r \lt 0.036$. This validates the viability of warm inflation in $f(Q)$ gravity and establishes a unified geometric framework for understanding both early universe inflation and late-time cosmic acceleration.
Current Issued
Chinese Physics C
2026 Vol. 50, No. 4
Published: 01 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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