## 2023 Vol. 47, No. 7

Display Method: |

2023, 47(7): 073101. doi: 10.1088/1674-1137/accc1d

**Abstract:**

Leptoquark (LQ) models are well motivated solutions to the

*B*quark chiral enhancements, which originate from the bottom and bottom partner mixing. Then, we propose new LQ and VLQ search channels under the constraints of

2023, 47(7): 073102. doi: 10.1088/1674-1137/acd367

**Abstract:**

Taking

2023, 47(7): 073103. doi: 10.1088/1674-1137/accf6d

**Abstract:**

The role of the triangle mechanism in the decay processes

*ϕ*decays into

2023, 47(7): 073104. doi: 10.1088/1674-1137/acd23e

**Abstract:**

In this work, we investigate the quasi-two-body decays

2023, 47(7): 073105. doi: 10.1088/1674-1137/acd365

**Abstract:**

Motivated by the experimental progress in the study of heavy baryons, we investigate the mass spectra of strange single heavy baryons in the

*λ*-mode, using the relativistic quark model and the infinitesimally shifted Gaussian basis function method. We show that experimental results are well captured using the predicted masses. The root mean square radii and radial probability density distributions of the wave functions are analyzed in detail. Meanwhile, the mass spectra allow us to successfully construct the Regge trajectories in the

2023, 47(7): 073106. doi: 10.1088/1674-1137/acd3da

**Abstract:**

In this study, we analyze the rare decays of the neutral vector mesons

*i.e*., the off-diagonal inputs, and the contributions of different parts are comparable. Taking into account the experimental constraints on the mass insertion parameters, the predicted branching ratios for the most promising processes

2023, 47(7): 074001. doi: 10.1088/1674-1137/acce28

**Abstract:**

The cross section values of the

2023, 47(7): 074101. doi: 10.1088/1674-1137/accc1e

**Abstract:**

Inspired by the recent near-threshold

*t*. Combined with the quark contributions to the

*D*-term form factor extracted from the deeply virtual Compton scattering experiment, the total

*D*-term is obtained to investigate their applications in describing the proton mechanical properties. These studies provide a unique perspective on investigating the proton gluon GFFs and important information for enhancing QCD constraints on the gluon GFFs.

2023, 47(7): 074102. doi: 10.1088/1674-1137/acccda

**Abstract:**

We propose a simple algorithm to further improve the previous variation after projection (VAP) wave functions for low-lying nonyrast states. We attach a weight factor to each calculated energy; then, the sum of these weighted energies is minimized. It turns out that a low-lying nonyrast VAP wave function can be further optimized when the weight factor for the corresponding energy is far larger than the other ones. Based on the improved WVAP wave functions, the energy-variance extrapolation method is applied to estimate the exact shell model energies. The calculated results for nuclei in the

2023, 47(7): 074103. doi: 10.1088/1674-1137/accdc6

**Abstract:**

The neutron-rich nuclei near doubly magic

2023, 47(7): 074104. doi: 10.1088/1674-1137/accf08

**Abstract:**

The variation after projection (VAP) method is expected to be an efficient way of obtaining the optimized nuclear wave functions, which can be as close as possible to the exact shell model ones. However, we found that there are two additional problems that may seriously affect the convergence of the VAP iteration. The first problem is the existence of irrelevant projected basis states. At a VAP iteration, the Hill-Wheeler (HW) equation is composed of all updated projected basis states. If one of these projected basis states does not mix with a calculated wave function of interest, which is obtained by solving this HW equation, it is likely that this basis state will never mix with this wave function even after the VAP iteration converges. The other problem is the poor orthonormality among the projected basis states, which seriously affects the accuracy of the calculated VAP wave function. In the present work, solutions for these two problems are proposed, and examples are presented to test the validity. With the present solutions, the most important projected basis states can be reliably obtained, and the fully optimized VAP wave functions can be accurately and efficiently calculated.

2023, 47(7): 074105. doi: 10.1088/1674-1137/accad6

**Abstract:**

A systematic study on the impact of widely-used nuclear-modified parton distribution function (nPDF) parameterizations on the production of direct photons and charged hadrons is performed by employing a next-to-leading order Monte Carlo event generator JETPHOX in hadronic collisions at LHC energies. The nuclear modification factors of photon and charged hadron productions are studied in three types of collision systems, i.e., small (

2023, 47(7): 074106. doi: 10.1088/1674-1137/acbf2b

**Abstract:**

In the present study, the newly established preformation formula is applied for the first time to study the kinematics of the cluster emission from various radioactive nuclei, especially those that decay to the double shell closure

*Q*-value, paving the way to quantify the energy contribution during preformation as well as during the tunneling process separately. The cluster-daughter interaction potential is obtained by folding the relativistic mean-field (RMF) densities with the recently developed microscopic R3Y using the NL

*NN*potentials to compare their adaptability. The penetration probabilities are calculated from the WKB approximation. With the inclusion of the new preformation probability

2023, 47(7): 074107. doi: 10.1088/1674-1137/acd3d9

**Abstract:**

The nucleon coalescence model is one of the most popular theoretical models for light nuclei production in high-energy heavy-ion collisions. The production of light nuclei

*d*,

*t*,

2023, 47(7): 074108. doi: 10.1088/1674-1137/acc791

**Abstract:**

The kernel ridge regression (KRR) method and its extension with odd-even effects (KRRoe) are used to learn the nuclear mass table obtained by the relativistic continuum Hartree-Bogoliubov theory. With respect to the binding energies of 9035 nuclei, the KRR method achieves a root-mean-square deviation of 0.96 MeV, and the KRRoe method remarkably reduces the deviation to 0.17 MeV. By investigating the shell effects, one-nucleon and two-nucleon separation energies, odd-even mass differences, and empirical proton-neutron interactions extracted from the learned binding energies, the ability of the machine learning tool to grasp the known physics is discussed. It is found that the shell effects, evolutions of nucleon separation energies, and empirical proton-neutron interactions are well reproduced by both the KRR and KRRoe methods, although the odd-even mass differences can only be reproduced by the KRRoe method.

2023, 47(7): 075101. doi: 10.1088/1674-1137/accdc7

**Abstract:**

Regular black holes, as part of an important attempt to eliminate the singularities in general relativity, have been of wide concern. Because the superradiance associated with rotating regular black holes plays an indispensable role in black hole physics, we calculate the superradiance related effects,

*i.e.*, the superradiance instability and the energy extraction efficiency, for a scalar particle with a small mass around a rotating regular black hole, where the rotating regular black hole is constructed by the modified Newman-Janis algorithm. We analytically give the eigenfrequency associated with instability and the amplification factor associated with energy extraction. For two specific models,

*i.e.*, the rotating Hayward and Bardeen black holes, we investigate how their regularization parameters affect the growth of instability and the efficiency of energy extraction from the two rotating regular black holes. We find that the regularization parameters give rise to different modes of the superradiance instability and the energy extraction when the rotation parameters vary. There are two modes for the growth of superradiance instability and four modes for the energy extraction. Our results show the diversity of superradiance in the competition between the regularization parameter and the rotation parameter for rotating regular black holes.

2023, 47(7): 075102. doi: 10.1088/1674-1137/acd2b7

**Abstract:**

In this study, we conduct an analysis of traversable wormhole solutions within the framework of linear

*α*and

*β*). Moreover, we establish bounds on these free parameters, which guarantee the satisfaction of the energy conditions throughout spacetime and also provide two solutions. Furthermore, we use the Israel junction condition to observe the stability of a thin-shell around the wormhole. Finally, we calculate the null energy condition criteria as well as the potential for the thin-shell and how it varies with the chosen shape function.

2023, 47(7): 075103. doi: 10.1088/1674-1137/acd43c

**Abstract:**

We study the particle motion around a black hole (BH) in Hořava-Lifshitz (HL) gravity with the Kehagias-Sfetsos (KS) parameter. First, the innermost stable circular orbit (ISCO) is obtained for massive particles around the BH in HL gravity. We find that the radii of the ISCOs decrease as the KS parameter decreases, meaning that the parameter

**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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