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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Probing Heavy Charged Higgs Boson Using Multivariate Technique at Gamma-Gamma Collider
Published: 2024-12-26
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Gravitational waves and primordial black holes from axion domain walls in level crossing
Published: 2024-12-26
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Schottky Anomaly of Reissner-Nordström-de Sitter spacetime
Published: 2024-12-24
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Angularity in Higgs boson decays via H→gg at NNLL' accuracy
2025, 49(2): 023106-023106-21. doi: 10.1088/1674-1137/ad94e0Show AbstractWe present improved predictions of a class of event-shape distributions called angularity for a contribution from an effective operator
$ H\to gg $ in Higgs hadronic decay that suffers from large perturbative uncertainties. In the framework of the soft-collinear effective theory, logarithmic terms of the distribution are resummed at NNLL' accuracy, for which a two-loop constant of gluon-jet function for angularity is independently determined using a fit to the fixed-order distribution at the NLO corresponding to$ {\cal{O}}( \alpha_s^2) $ relative to the Born rate. Our determination has reasonable agreement with the value in a recently released thesis. In the fit, we use an asymptotic form with a fractional power conjectured from recoil corrections at one-loop order, and it improves the accuracy of determining positive values of the angularity parameter a. The resummed distribution is matched to the NLO fixed-order results to make our predictions valid at all angularity values. We also discuss the first and subtracted moments of angularity as a function of a that enable the extraction of information on leading and subleading nonperturbative corrections associated with gluons. -
Noncommutativity and its role in constant-roll inflation models with non-minimal coupling constrained by swampland conjectures
2025, 49(2): 025108-025108-18. doi: 10.1088/1674-1137/ad93b7Show AbstractIn this paper, using Hamiltonian formalism, we obtain solutions for constant-roll inflation according to the noncommutativity and the non-minimal coupling field of the Lagrangian. We consider three different types of couplings: power-law, exponential, and logarithmic. Subsequently, by plotting some figures, we study the effects of these coupling in constant-roll inflation with noncommutative parameters. We identify and specify the permissible regions of each case of the swampland conjecture and determine the best model. We find that the exponential, logarithmic, and power-law couplings with
$\theta>0$ agree with the dS swampland conjecture. These couplings provide similar results in both cases, some of which are compatible and some incompatible with the dS swampland conjectures. Moreover,$\theta>0$ is more compatible than$\theta<0$ , and the consistency value in the second boundary condition is much higher than in the first. The order of better compatibility of couplings with the swampland conjecture is ranked as follows: exponential non-minimal coupling, logarithmic non-minimal coupling, and power-law non-minimal coupling. For each type of coupling, we calculate the values of the scalar spectral index$n_s$ and the tensor-to-scalar ratio r for two different potentials and compare them with the observational data from Planck 2018. We also determine the range of the free parameters$(a,b,q)$ of the further refining de Sitter swampland conjecture (FRDSSC) that make the model consistent with the conjecture. We find that the model satisfies the FRDSSC for all types of couplings and both potentials, with some constraints on the parameters. -
p-wave mesons emitting weak decays of bottom mesons
2025, 49(2): 023105-023105-13. doi: 10.1088/1674-1137/ad9893Show AbstractThis paper is the extension of our previous work entitled ''Searching a systematics for nonfactorizable contributions to
$ {B^ - } $ and$ {\bar B^0} $ hadronic decays''. Obtaining the factorizable contributions from the spectator-quark model for$ {N_c} = 3, $ a systematics was identified among the isospin reduced amplitudes for the nonfactorizable terms among$ \bar B \to D\pi /{D^*}\pi /D\rho $ decay modes. This systematics enables us to derive a generic formula to help predict the branching fractions for$ {\bar B^0} - $ decays. Inspired by this observation, we extend our analysis to p-wave meson emitting decays of$ B - $ meson$ \bar B \to PA/PT/PS, $ particularly$\bar B \to {a_1}D/\pi {D_1}/\pi D'_1/\pi {D_2}/\pi {D_0}$ , which have similar isospin structures and make predictions for$ {\bar B^0} - $ decays, for which experimental measurements are not yet available.
Current Issued
2025 Vol. 49, No. 1
Published: 27 December 2024
Published: 27 December 2024
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Original research articles, Ietters and reviews Covering theory and experiments in the fieids of
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- 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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