## 2022 Vol. 46, No. 9

Display Method: |

2022, 46(9): 093001. doi: 10.1088/1674-1137/ac74a9

**Abstract:**

A search for the dimuon decay of the Standard Model Higgs boson is performed using Monte Carlo simulated events to mimic data corresponding to an integrated luminosity of 5.6 ab

2022, 46(9): 093101. doi: 10.1088/1674-1137/ac6daa

**Abstract:**

Exclusive vector meson production is an excellent probe for describing the structure of protons. In this study, based on the dipole model, the differential cross sections, total cross sections, and ratios of the longitudinal to transverse cross section of the

2022, 46(9): 093102. doi: 10.1088/1674-1137/ac6dc6

**Abstract:**

Recently, scientists have achieved significant progress in experiments searching for excited

*D*-wave bottom baryons in the future.

2022, 46(9): 093103. doi: 10.1088/1674-1137/ac6e35

**Abstract:**

The minimal supersymmetric extension of the standard model (MSSM) is extended to the

*CP)*violating effects are considered to study the lepton electric dipole moment (EDM) in the

*CP*violating phases in the

*CP*violating phases; hence, there are new contributions to lepton EDMs. This is conducive to exploring the source of

*CP*violation and probing new physics beyond the SM.

2022, 46(9): 093104. doi: 10.1088/1674-1137/ac6e37

**Abstract:**

In this paper, we present the universal structure of the alphabet of one-loop Feynman integrals. The letters in the alphabet are calculated using the Baikov representation with cuts. We consider both convergent and divergent cut integrals and observe that letters in the divergent cases can be easily obtained from convergent cases by applying certain limits. The letters are written as simple expressions in terms of various Gram determinants. The knowledge of the alphabet enables us to easily construct the canonical differential equations of the

2022, 46(9): 093105. doi: 10.1088/1674-1137/ac6ed2

**Abstract:**

There may be seven

2022, 46(9): 093106. doi: 10.1088/1674-1137/ac7041

**Abstract:**

Using the Bethe-Salpeter equation (BSE), we investigate the forward-backward asymmetries

2022, 46(9): 093107. doi: 10.1088/1674-1137/ac71a6

**Abstract:**

Recently, the Muon

*g*-2 experiment at Fermilab measured the muon anomalous magnetic dipole moment (MDM),

*σ*. In this work, we reanalyze the muon anomalous MDM at the two-loop level in the

*μ*from the

*ν*Supersymmetric Standard Model (

2022, 46(9): 093108. doi: 10.1088/1674-1137/ac7200

**Abstract:**

If two annihilation products of dark matter (DM) particles are non-relativistic and couple to a light force mediator, their plane wave functions are modified due to multiple exchanges of the force mediator. This gives rise to the final state Sommerfeld (FSS) effect. It is also possible that the final state particles form a bound state. Both the FSS effect and final bound-state (FBS) effect need to be considered in the calculation of the DM relic abundance. The annihilation products can be non-relativistic if their masses are comparable to those of the annihilating DM particles. We study the FSS and FBS effects in the mass-degenerate region using two specific models. Both models serve to illustrate different partial-wave contributions in the calculations of the FSS and FBS effects. We find that the FBS effect can be comparable to the FSS effect when the annihilation products couple strongly with a light force mediator. Those effects significantly modify the DM relic abundance.

2022, 46(9): 093109. doi: 10.1088/1674-1137/ac7299

**Abstract:**

The two-photon radiative decay process

2022, 46(9): 093110. doi: 10.1088/1674-1137/ac7317

**Abstract:**

The influence of the isospin-breaking

2022, 46(9): 093111. doi: 10.1088/1674-1137/ac745a

**Abstract:**

We study the application of BCFW recursion relations to the QED process

2022, 46(9): 093112. doi: 10.1088/1674-1137/ac7547

**Abstract:**

New physics could be explored through loop effects using the precision measurements at the Circular Electron Positron Collider (CEPC) owing to its clean collision environment and high luminosity. In this paper, we focus on two dark matter models that involve additional electroweak fermionic multiplets. We calculate their one-loop corrections in five processes, i.e.,

2022, 46(9): 094001. doi: 10.1088/1674-1137/ac6dab

**Abstract:**

The positive-parity signature partner bands in

^{103,105}Pd and

^{109}Cd nuclei are investigated using the classical particle-rotor model. Based on the systematic study of neighbouring nuclei, the signature partner bands of

^{105}Pd are assigned to the

^{105}Pd reproduce the experimental values well and exhibit a decrease with increasing angular momentum, suggesting that these two bands may originate from antimagnetic rotation. Similar signature partner bands are also found in the neighboring

^{103}Pd and

^{109}Cd nuclei. The properties of both bands are in general agreement with the fingerprints of antimagnetic rotation, and thus the signature partner bands of

^{103}Pd and

^{109}Cd are suggested to be candidates for the multiple antimagnetic rotational bands of

^{105}Pd. In addition, the evolution of the two-shears-like mechanism for possible multiple antimagnetic rotational bands in

^{103,105}Pd and

^{109}Cd nuclei is examined by investigating the orientation of the angular momenta.

2022, 46(9): 094002. doi: 10.1088/1674-1137/ac6f4f

**Abstract:**

Excited states of

^{119}Sn have been studied using an in-beam

*γ*-ray spectroscopic technique following the incomplete fusion of

^{7}Li on a

^{116}Cd target at a beam energy of 42 MeV. A new bandlike structure is proposed to result from deformed two-particle-two-hole (2

*p*-2

*h*) proton excitations across the

*Z*= 50 closed shell based on the systematics of odd-

*A*Sn isotopes and configuration-fixed constrained triaxial relativistic mean-field calculations. This observation extends the boundaries of the deformed 2

*p*-2

*h*collective band to

*A*= 119 in Sn isotopes.

2022, 46(9): 094003. doi: 10.1088/1674-1137/ac73e8

**Abstract:**

This study measured the yields of the radionuclides

^{82}Sr,

^{83(m+g)}Sr,

^{85m}Sr,

^{85g}Sr,

^{87m}Sr,

^{81(g+0.976m)}Rb,

^{ 82m}Rb,

^{ 83g}Rb,

^{ 84(m+g)}Rb, and

^{86(m+g)}Rb produced in

^{nat}Sr(

*γ*,

*xnyp*) multiparticle reactions with bremsstrahlung end-point energies of 55, 60, and 65 MeV. The bremsstrahlung radiation was generated using the 100-MeV electron linear accelerator at the Pohang Accelerator Laboratory, Korea, and the reaction yields were derived from the induced activitiesmeasured using off-line

*γ*-ray spectrometry. To obtain accurate experimental results, we performed the necessary

*γ*-rayinterference corrections. The experimental results were compared with the theoretical predictions obtained usingthe TALYS-1.95 statistical nuclear model code. The calculations were performed using six different level-density models to ascertain which model best fitted the experimental results. The dependence of the reaction yield on the incident bremsstrahlung energy and on the number of nucleons emitted by the photonuclear reactions was also investigated.

2022, 46(9): 094101. doi: 10.1088/1674-1137/ac6dac

**Abstract:**

The collinearly-improved Balitsky-Kovchegov (ciBK) equation evolved unintegrated gluon distribution (UGD) is used for the first time to study hadron production in high energy proton-proton collisions in order to improve the predictive power of the Color Glass Condensate effective theory. We show that the ciBK equation evolved UGD provides a relatively better description of LHC data on the transverse momentum and integrated multiplicity distributions of charged hadron and neutral pion production for several collision energies compared with the running coupling Balitsky-Kovchegov (rcBK) equation evolved UGD. This is because the ciBK evolved UGD has a sharper transverse momentum distribution than the rcBK UGD. The impact of running coupling prescriptions on hadron production is studied, and it is found that the parent dipole and smallest dipole running coupling prescriptions provide similar depictions of the data. Moreover, the scale dependence of the fragmentation function is investigated by taking three typical values of scale. We find that the differences resulting from the scale dependence of the fragmentation function can be fully absorbed into the normalization factor, which lumps higher order corrections.

2022, 46(9): 094102. doi: 10.1088/1674-1137/ac6ed3

**Abstract:**

Multinucleon transfer reactions near the Coulomb barrier are investigated based on the improved dinuclear system (DNS) model, and the deexcitation process of primary fragments are described using the statistical model GEMINI++. The production cross sections of

2022, 46(9): 094103. doi: 10.1088/1674-1137/ac6f4e

**Abstract:**

Based on the current measurement of the neutron distribution radius (

^{208}Pb from the PREX-2 data, we revisited the recently developed G3 and IOPB-I force parameters by fine-tuning some specific couplings within the relativistic mean-field (RMF) model. The

*ω–*

*ρ*-mesons coupling

*ρ*-meson coupling

^{208}Pb without compromising the bulk properties of finite nuclei and infinite nuclear matter observables. The modified parameter sets are applied to calculate the gross properties of finite nuclei such as binding energies, charge distributions, nuclear radii, pairing gaps, and single-particle energies. The root-mean-square deviations in binding energy and charge radius are estimated with respect to the available experimental data for 195 even–even nuclei, and the results compare favourably with the well-calibrated effective interactions of Skyrme, Gogny and other relativistic mean-field parametrizations. The pairing gap estimations for modified G3 and IOPB-I for Sn isotopes are also compared with the Hartree–Fock–Bogoliubov calculation with the Gogny (D1S) interaction. The isotopic shift and single-particle energy spacing are also calculated and compared with the experimental data for both original and modified versions of the G3 and IOPB-I parameter sets. Subsequently, both the modified parameter sets are used to obtain the various infinite nuclear matter observables at saturation. In addition to these, the force parameters are adopted to calculate the properties of a high isospin asymmetry dense system such as neutron star matter and tested for validation using the constraint from GW170817 binary neutron star merger events. The tuned forces predict relatively good results for finite and infinite nuclear matter systems and the current limitation on the neutron radius from PREX-2. A systematic analysis using these two refitted parameter sets over the nuclear chart will be communicated shortly.

2022, 46(9): 094104. doi: 10.1088/1674-1137/ac6fc8

**Abstract:**

Charmonium dissociation is an important probe of the quark–gluon plasma medium in heavy-ion collisions. The magnetic field produced in non-central collisions can affect the charmonia and their dissociation. We study the

2022, 46(9): 094105. doi: 10.1088/1674-1137/ac7201

**Abstract:**

Light mesons

*σ*first decreases and then increases with chiral symmetry restoration, only showing a jump at the first order chiral phase transition. We plot a chiral phase diagram in terms of the change in quark mass, the Mott transition of the pseudo-Goldstone mode

*σ*. Owing to explicit breaking of chiral symmetry in the physical case, the chiral restoration phase boundaries on the

*σ*mass jumps will be helpful to the experimental search for the chiral phase diagram and critical end point. On the

2022, 46(9): 095101. doi: 10.1088/1674-1137/ac6dc8

**Abstract:**

The dependence of the black hole (BH) shadow and thermodynamics may be structured in regular spacetime. Taking a regular Bardeen-AdS BH as an example, the relationship between the shadow radius and event horizon radius is derived. It is found that these two radii display a positive correlation, implying that the BH temperature can be rewritten as a function of shadow radius in regular spacetime. By analyzing the phase transition curves under the shadow context, we find that the shadow radius can replace the event horizon radius to present the BH phase transition process, and the phase transition grade can also be revealed by the shadow radius, indicating that the shadow radius may serve as a probe for phase structure in regular spacetime. Utilizing the temperature-shadow radius function, the thermal profile of the Bardeen-AdS BH is established. Moreover, the temperature exhibits an N-type change trend in the

2022, 46(9): 095102. doi: 10.1088/1674-1137/ac6ed4

**Abstract:**

One of the fundamental challenges in cosmic ray physics is to explain the nature of cosmic ray acceleration and propagation mechanisms. Owing to the precise cosmic ray data measured by recent space experiments, we can investigate cosmic ray acceleration and propagation models more comprehensively and reliably. In this paper, we combine the secondary-to-primary ratios and primary spectra measured by PAMELA, AMS02, ACE-CRIS, and Voyager-1 to constrain the cosmic ray source and transport parameters. The study shows that the

*Alfvén velocity*

2022, 46(9): 095103. doi: 10.1088/1674-1137/ac70ad

**Abstract:**

We study the linear instability and nonlinear dynamical evolution of the Reissner-Nordström (RN) black hole in the Einstein-Maxwell-scalar theory in asymptotic flat spacetime. We focus on the coupling function

2022, 46(9): 095104. doi: 10.1088/1674-1137/ac74b0

**Abstract:**

This paper examines traversable wormhole models in the

**ISSN** 1674-1137 **CN** 11-5641/O4

Original research articles, Ietters and reviews Covering theory and experiments in the fieids of

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- Cosmology

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