Highlights
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Octupole correlations in stable nucleus 153Eu within reflection-asymmetric particle rotor model
2025, 49(1): 014103. doi: 10.1088/1674-1137/ad78d6The observed low-lying
$K=5/2^\pm$ positive- and negative-parity bands in the stable nucleus 153Eu are investigated using the reflection-asymmetric triaxial particle rotor model. The experimental energy spectra, energy staggering parameters, and intraband$E2$ and$M1$ transition probabilities are well reproduced. The calculated interband$B(E1)$ values are found to depend sensitively on the octupole deformation parameter$\beta_{30}$ , although the energy spectra and intraband$E2$ and$M1$ transitions can be reproduced without the octupole degree of freedom. The observed enhanced$E1$ transition probabilities can be reproduced with$\beta_{30}=0.05$ . The detailed analysis of the intrinsic wave functions shows these nearly degenerate positive- and negative-parity bands are built on two individual proton configurations, i.e., dominated by$\pi g_{7/2}[\Omega=5/2]$ and$\pi h_{11/2}[\Omega=5/2]$ , respectively, which differs from the parity doublet bands built on a single parity-mixed configuration. -
Measurement of the integrated luminosity of data samples collected during 2019-2022 by the Belle II experiment
2025, 49(1): 013001. doi: 10.1088/1674-1137/ad806cA series of data samples was collected with the Belle II detector at the SuperKEKB collider from March 2019 to June 2022. We determine the integrated luminosities of these data samples using three distinct methodologies involving Bhabha (
$e^+e^- \to e^+e^-(n\gamma)$ ), digamma ($e^+e^- \to \gamma\gamma(n\gamma)$ ), and dimuon ($e^+e^- \to \mu^+ \mu^- (n\gamma)$ ) events. The total integrated luminosity obtained with Bhabha, digamma, and dimuon events is (426.88 ± 0.03 ± 2.61) fb−1, (429.28 ± 0.03 ± 2.62) fb−1, and (423.99 ± 0.04 ± 3.83) fb−1, where the first uncertainties are statistical and the second are systematic. The resulting total integrated luminosity obtained from the combination of the three methods is (427.87 ± 2.01) fb−1. -
Holographic bottom-up approach to Σ baryons
2025, 49(1): 013104. doi: 10.1088/1674-1137/ad7d75In this study, we discuss the description of neutral Σ baryons with
$ I(J^P)=1(1/2^+) $ and$ I(J^P)=1(3/2^+) $ using two bottom-up approaches: the deformed background and static dilaton models. In both models, we consider a non-linear Regge trajectory extension motivated by the strange nature of Σ baryons. We find that both models describe these systems with an RMS error smaller than 10%. We also perform a configurational entropy calculation in both models to discuss hadronic stability.
Just Accepted
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ρ meson form factors and parton distribution functions in impact parameter space
Published: 2025-02-08
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Black hole tunneling in loop quantum gravity
Published: 2025-02-07
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Measurements of decay branching fractions of the Higgs boson to hadronic final states at the CEPC
Published: 2025-02-07
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Fused model of the alternating spin chain from ABJM theory
2025, 49(3): 033103-033103-9. doi: 10.1088/1674-1137/ada521Show AbstractIn this paper, we present an algebraic construction of the fused model for the ABJM spin chain by gluing two adjacent quantum spaces and two original auxiliary spaces. We prove the integrability of the fused model by demonstrating the validity of the Yang-Baxter equation. Owing to the regularity property of the fused R-matrix, we successfully construct the boost operator for the fused model and obtain the third-order charge accordingly. We also investigate the open spin chain Hamiltonian for the fused model and indicate the general common structures of the boundary terms which are further used to analyze the integrability of the flavored ABJM Hamiltonian.
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Soft pattern of Rutherford scattering from heavy target mass expansion
2025, 49(3): 033102-033102-11. doi: 10.1088/1674-1137/acdb56Show AbstractWe investigate the soft behavior of the tree-level Rutherford scattering process. We consider two types of Rutherford scattering processes: One in which a low-energy massless point-like projectile (say, a spin-
${1/ 2}$ or spin-$ 0 $ electron) hits a static massive composite target particle carrying various spins (up to spin-$ 2 $ ), and one where a slowly-moving light projectile hits a heavy static composite target. For the first type, the unpolarized cross sections in the laboratory frame are found to exhibit universal forms in the first two orders of$ 1/M $ expansion yet differ at the next-to-next-to-leading order (though some terms at this order still remain universal or depend on the target spin in a definite manner). For the second type, at the lowest order in electron velocity expansion, through all orders in$ 1/M $ , the unpolarized cross section is universal (also not sensitive to the projectile spin). The universality partially breaks down at relative order-$ v^2/M^2 $ , though some terms at this order are still universal or depend on the target spin in a specific manner. We also employ the effective field theory approach to reproduce the soft behavior of the differential cross sections for when the target particle is a composite spin-${1/ 2}$ fermion. -
Thermodynamic topology of Kiselev-AdS black holes within f (R, T) gravity
2025, 49(3): 035110-035110-15. doi: 10.1088/1674-1137/ada379Show AbstractIn this paper, we investigate the topological charge and conditions for the existence of the photon sphere in Kiselev-anti-de Sitter (AdS) black holes within
$f(R, T)$ gravity. Furthermore, we establish their topological classifications. We employ two different methods based on Duan’s topological current ϕ-mapping theory viz analysis of temperature and the generalized Helmholtz free energy methods to study the topological classes of our black hole. Considering this black hole, we discuss the critical and zero points (topological charges and topological numbers) for different parameters. Our findings reveal that the Kiselev parameter ω and$f(R, T)$ gravity parameter γ influence the number of topological charges of black holes, providing novel insights into topological classifications. We observe that for given values of the free parameters, total topological charges ($Q_{\rm total} = -1$ ) exist for the T method and total topological numbers ($W = +1$ ) for the generalized Helmholtz free energy method. Our research findings elucidate that, in contrast to the scenario in which$\omega = 1/3$ , in other cases, increasing γ increases the number of total topological charges for the black hole. Interestingly, for the phantom field ($\omega = -4/3$ ), we observe that decreasing γ increases the number of topological charges. Additionally, we study the results for the photon sphere. The studied models reveal that the simultaneous presence of γ and ω effectively expands the permissible range for γ. In other words, the model can exhibit black hole behavior over a larger domain. Additionally, we observe that with the stepwise reduction of ω, the region covered by singularity diminishes and becomes more restricted. However, an interesting point about all three ranges is the elimination of the forbidden region in this model. In other words, this model and the investigated areas appear to have no region in which both the ϕ and metric functions simultaneously lack solutions. Additionally, we fully check the curvatures singularities and energy conditions for the mentioned black hole.
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