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/ad78d6
The 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/ad806c
A 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/ad7d75
In 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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Off-equatorial deflections and gravitational lensing. I. In Kerr spacetime and effect of spin
Published: 2025-01-07
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Revisiting the alpha-decay reduced width of the lightest uranium isotope 214U
Published: 2025-01-07
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Sub-barrier Fusion Cross Sections: Role of Pauli Blocking and Isospin Asymmetry
Published: 2025-01-04
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Improved constraints on Higgs boson self-couplings with quartic and cubic power dependencies of the cross section
2025, 49(2): 023107-023107-8. doi: 10.1088/1674-1137/ad9d1dShow AbstractPrecise determination of the Higgs boson self-couplings is essential for understanding the mechanism underlying electroweak symmetry breaking. However, owing to the limited number of Higgs boson pair events at the LHC, only loose constraints have been established to date. Current constraints are based on the assumption that the cross section is a quadratic function of the trilinear Higgs self-coupling within the
$\kappa$ framework. Incorporating higher-order quantum corrections from virtual Higgs bosons would significantly alter this functional form, introducing new quartic and cubic power dependencies on the trilinear Higgs self-coupling. To derive this new functional form, we propose a specialized renormalization procedure that tracks all Higgs self-couplings at each calculation step. Additionally, we introduce renormalization constants for coupling modifiers within the$\kappa$ framework to ensure the cancellation of all ultraviolet divergences. With new functional forms of the cross sections in both the gluon-gluon fusion and vector boson fusion channels, the upper limit of$\kappa_{\lambda_{{\rm{3H}}}}=\lambda_{{\rm{3H}}}/\lambda_{{\rm{3H}}}^{{\rm{SM}}}$ set by the ATLAS (CMS) collaboration is reduced from 6.6 (6.49) to 5.4 (5.37). However, extracting a meaningful constraint on the quartic Higgs self-coupling$\lambda_{{\rm{4H}}}$ from Higgs boson pair production data remains challenging. We also present the invariant mass distributions of the Higgs boson pair at different values of the self-couplings, which could assist in setting optimal cuts for experimental analysis. -
Impact of nonextensivity on the transport coefficients of strongly interacting QCD matter
2025, 49(2): 023108-023108-17. doi: 10.1088/1674-1137/ad99b1Show AbstractTsallis nonextensive statistics is applied to study the transport coefficients of strongly interacting matter within the Polyakov chiral
$S U(3) $ quark mean field model (PCQMF). Nonextensivity is introduced within the PCQMF model through a dimensionless parameter q to examine the viscous properties, such as shear viscosity (η) and bulk viscosity ($\zeta_b$ ), and conductive properties, such as electrical conductivity ($\sigma_{el}$ ) and thermal conductivity (κ). Additionally, some key thermodynamic quantities relevant to the transport coefficients, such as the speed of sound ($c_{sq}^2$ ) and specific heat at constant volume ($c_{vq}$ ), are calculated. The temperature dependence of the transport coefficients is explored through a kinetic theory approach with the relaxation time approximation. The results are compared to those of the extensive case where q approaches 1. The nonextensive q parameter is found to have a significant effect on all transport coefficients. We find that the nonextensive behaviour of the medium enhances specific shear viscosity$\eta/s_q$ , as well as conductive coefficients$\sigma_{el}/{\rm T}$ and$\kappa/{\rm T}^2$ . In contrast, the normalized bulk viscosity$\zeta_b/s_q$ is found to decrease as the nonextensivity of the medium increases. We also studied the transport coefficients for finite values of chemical potentials. The magnitudes of η,$\sigma_{el}$ , and κ increase at lower temperatures, while ζb is found to decrease for systems with non-zero chemical potential. -
Anisotropic quark stars in
${\boldsymbol {f(R,L_m,T)} }$ gravity2025, 49(2): 025110-025110-12. doi: 10.1088/1674-1137/ad99b2Show AbstractWe investigated the impact of$f(R,L_m,T)$ gravity on the internal structure of compact stars, expecting this theory to manifest prominently in the high-density cores of such stars. We considered the algebraic function$f(R,L_m,T) = R + \alpha T L_m$ , where α represents the matter-geometry coupling constant. We specifically chose the matter Lagrangian density$L_m= -\rho$ to explore compact stars with anisotropic pressure. To this end, we employed the MIT bag model as an equation of state. Subsequently, we numerically solved the hydrostatic equilibrium equations to obtain mass-radius relations for quark stars (QSs), examining static stability criteria, adiabatic index, and speed of sound. Finally, we used recent astrophysical data to constrain the coupling parameter α, which may lead to either larger or smaller masses for QSs, compared to their counterparts in general relativity.
Current Issued
2025 Vol. 49, No. 1
Published: 27 December 2024
Published: 27 December 2024
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IF: 3.6
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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 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
- Cover Story (Issue 9, 2024) Measurement of solar pp neutrino flux using electron recoil data from PandaX-4T commissioning run
- 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
- Cover Story (Issue 2, 2024) | Quark/gluon taggers light the way to new physics
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