## 2022 Vol. 46, No. 8

Display Method: |

2022, 46(8): 081001. doi: 10.1088/1674-1137/ac68d7

**Abstract:**

The recently proposed

*K-*matrix unitarization, by fitting to low-energy cross section and phase shift data. It is found that

2022, 46(8): 083101. doi: 10.1088/1674-1137/ac6666

**Abstract:**

Analytical formulae for the phase space factors and three-momenta of three- and four-body final states are derived for all sets of independent kinematic variables containing invariant mass variables. These formulae will help experimental physicists to perform data analysis. As an example, we show how to use these formulae to distinguish the different mechanisms of the

2022, 46(8): 083102. doi: 10.1088/1674-1137/ac67d0

**Abstract:**

We consider a simple scalar dark matter model within the frame of gauged

*S*and Φ, are introduced to the Standard Model (SM), where

*S*and Φ are SM singlets but both carry

*S*can acquire different masses after spontaneously breaking symmetry, and the lighter one can play the role of dark matter, which is stabilized by an extra

2022, 46(8): 083103. doi: 10.1088/1674-1137/ac6573

**Abstract:**

Considering the

*B*mesonic wave function

*K*, and

*V*denotes the ground

2022, 46(8): 083104. doi: 10.1088/1674-1137/ac6a4e

**Abstract:**

A new approach for tree-level amplitudes with multiple fermion lines is presented. It primarily focuses on the simplification of fermion lines. By calculating two vectors recursively without any matrix multiplications, the result of a fermion line is reduced to a very compact form depending only on the two vectors. Comparisons with other packages are presented, and the results show that our package FDC provides a very good performance in the processes of multiple fermion lines with this new approach and some other improvements. A further comparison with WHIZARD shows that this new approach has a competitive efficiency in computing pure amplitude squares without phase space integration.

2022, 46(8): 083105. doi: 10.1088/1674-1137/ac6a4f

**Abstract:**

In this paper, we present some results on the behavior of the total cross section and

*ρ*-parameter at asymptotic energies in proton–proton (

*ρ*-parameter for

*ρ*-parameter at the TeV-scale, which complicates any prediction for the beginning of the asymptotic domain, the fitting procedures indicates that asymptotia occur in the energy range 25.5–130 TeV. Moreover, in the asymptotic regime, we obtain

2022, 46(8): 083106. doi: 10.1088/1674-1137/ac6b92

**Abstract:**

We investigate the in-medium masses of open charm mesons (

*D*(

*σ*, strange field

*ζ*, and isovector field

*δ*) in the presence of a magnetic field. The mass modifications of the charmonium states result from the modification of gluon condensates in a medium simulated by the variation in the dilaton field (

*χ*) in the chiral effective model. The effects of finite quark masses are also incorporated in the trace of the energy-momentum tensor in quantum chromodynamics to investigate the mass shifts of charmonium states. The in-medium masses of open charm mesons and charmonia are observed to decrease with an increase in baryon density. The charged

*D*mesons. The mass shifts of charmonia are observed to be larger in hyperonic media compared with nuclear media when the effect of the finite quark mass term is neglected. These medium mass modifications can have observable consequences on the production of the open charm mesons and charmonia in high-energy asymmetric heavy-ion collision experiments.

2022, 46(8): 083107. doi: 10.1088/1674-1137/ac6cd3

**Abstract:**

Many researches from both theoretical and experimental perspectives have been performed to search for a new Higgs Boson that is lighter than the 125

*h*or

*H*is considered to be the LHC observed 125

2022, 46(8): 083108. doi: 10.1088/1674-1137/ac6cd5

**Abstract:**

We study the

*T*matrices, and the other source is that the loops involving kaons in the production mechanism do not cancel due to the different masses of charged and neutral kaons. We obtain a branching ratio for

2022, 46(8): 083109. doi: 10.1088/1674-1137/ac6cd8

**Abstract:**

We study the dynamical chiral symmetry breaking/restoration for various numbers of light quarks flavors

*T*and quark chemical potential

*μ*for various

*T*and

*μ*, we observe that the critical number of colors

*T*and

*μ*increase. Consequently, the critical temperature

2022, 46(8): 083110. doi: 10.1088/1674-1137/ac6d4e

**Abstract:**

In the framework of the QCD factorization approach, we study the localized

*B*or

*D*meson decays.

2022, 46(8): 083111. doi: 10.1088/1674-1137/ac6d51

**Abstract:**

The XENON1T excess of keV electron recoil events may be induced by the scattering of electrons and long-lived particles with an MeV mass and high speed. We consider a tangible model composed of two scalar MeV dark matter (DM) particles,

*ϕ*.

*X*. Although the constraints from Big Bang nucleosynthesis, cosmic microwave background (CMB), and low-energy experiments set the

*s*-wave process

2022, 46(8): 084101. doi: 10.1088/1674-1137/ac67cf

**Abstract:**

Density-dependent nuclear symmetry energy is directly related to isospin asymmetry for finite and infinite nuclear systems. It is critical to determine the coefficients of symmetry energy and their related observables because they hold great importance in different areas of nuclear physics, such as the analysis of the structure of ground state exotic nuclei and neutron star studies. The ground state bulk properties of Scandium (Z = 21) and Titanium (Z = 22) nuclei are calculated, such as their nuclear binding energy (

*N*= 20 and 28 for both isotopic chains using the nuclear bulk and isospin quantities. In addition to these, a few shell/sub-shell closure signatures are observed near the drip-line region at

*N*= 34 and 50 by following the surface/isospin dependent observables, namely symmetry energy and its component, for both the isotopic chain of

*odd-A*Sc- and

*even-even*Ti- nuclei.

2022, 46(8): 084102. doi: 10.1088/1674-1137/ac6abc

**Abstract:**

A reasonable prediction of photofission observables plays a paramount role in understanding the photofission process and guiding various photofission-induced applications, such as short-lived isotope production, nuclear waste disposal, and nuclear safeguards. However, the available experimental data for photofission observables are limited, and the existing models and programs have mainly been developed for neutron-induced fission processes. In this study, a general framework is proposed for characterizing the photofission observables of actinides, including the mass yield distributions (MYD) and isobaric charge distributions (ICD) of fission fragments and the multiplicity and energy distributions of prompt neutrons (

*n*) and prompt

_{p}*γ*rays (

*γ*

*). The framework encompasses various systematic neutron models and empirical models considering the Bohr hypothesis and does not rely on the experimental data as input. These models are then validated individually against experimental data at an average excitation energy below 30 MeV, which shows the reliability and robustness of the general framework. Finally, we employ this framework to predict the characteristics of photofission fragments and the emissions of prompt particles for typical actinides including*

_{p}^{232}Th,

^{235, 238}U and

^{240}Pu. It is found that the

^{238}U(

*γ*,

*f*) reaction is more suitable for producing neutron-rich nuclei compared to the

^{232}Th(

*γ*,

*f*) reaction. In addition, the average multiplicity number of both

*n*and

_{p}*γ*

*increases with the average excitation energy.*

_{p}
2022, 46(8): 084103. doi: 10.1088/1674-1137/ac6cd6

**Abstract:**

Recent experiments show that

2022, 46(8): 084104. doi: 10.1088/1674-1137/ac6cd7

**Abstract:**

The binding and proton separation energies of nuclides with

2022, 46(8): 085001. doi: 10.1088/1674-1137/ac66cc

**Abstract:**

Solar, terrestrial, and supernova neutrino experiments are subject to muon-induced radioactive background. The China Jinping Underground Laboratory (CJPL), with its unique advantage of a 2400 m rock coverage and long distance from nuclear power plants, is ideal for MeV-scale neutrino experiments. Using a 1-ton prototype detector of the Jinping Neutrino Experiment (JNE), we detected 343 high-energy cosmic-ray muons and (7.86

^{−1}g

^{−1}cm

^{2}at an average muon energy of 340 GeV. We provided the first study for such neutron background at CJPL. A global fit including this measurement shows a power-law coefficient of (0.75

2022, 46(8): 085101. doi: 10.1088/1674-1137/ac6665

**Abstract:**

In recent years, the study of quantum effects near the event horizon of a black hole (BH) has attracted extensive attention. It has become one of the important methods to explore BH quantum properties using the related properties of a quantum deformed BH. In this work, we study the effect of a quantum deformed BH on the BH shadow in two-dimensional Dilaton gravity. In this model, quantum effects are reflected by the quantum correction parameter

*m*. By calculation, we find that: (1) the shape of the shadow boundary of a rotating BH is determined by the BH spin

*a*, the quantum correction parameter

*m*, and the BH type parameter

*n*; (2) when the spin

*m*; with an increase in the parameter

*m*, the boundary of the BH shadow expands; (4) the size of the BH shadow varies greatly with respect to various quantum deformed BHs (

*n*), and the change in BH shadow shape caused by parameter

*n*is similar to that caused by parameter

*m*, which indicates that there is a "degenerate phenomenon" between the two parameters. Because the value of

*m*in actual physics should be very small, the current observations of the event horizon telescope (EHT) cannot distinguish quantum effects from the BH shadow. In future BH shadow measurements, it will be possible to distinguish quantum deformed BHs, which will help to better understand the quantum effects of BHs.

2022, 46(8): 085102. doi: 10.1088/1674-1137/ac67ce

**Abstract:**

In order to clearly understand the gravitational theory through the thermal properties of the black hole, it is important to further investigate the first-order phase transition of black holes. In this paper, we adopt different conjugate variables (

2022, 46(8): 085103. doi: 10.1088/1674-1137/ac68da

**Abstract:**

Dark matter (DM) direct detection experiments have been setting strong limits on the DM–nucleon scattering cross section at the DM mass above a few GeV, but leave large parameter spaces unexplored in the low mass region. DM is likely to be scattered and boosted by relativistic cosmic rays in the expanding universe if it can generate nuclear recoils in direct detection experiments to offer observable signals. Since low energy threshold detectors using Germanium have provided good constraints on ordinary halo GeV-scale DM, it is necessary to re-analyze 102.8 kg

^{2}for the spin-independent DM–nucleon scattering cross section, at a 90% confidence level. The CDEX-10 result is able to close the gap unambiguously in the parameter space between the MiniBooNE and XENON1T constraints, which were partially hindered by the Earth attenuation effect. We also quantitatively calculate the expected neutrino floor on searching for CRBDM in future direct detection experiments using Germanium.

2022, 46(8): 085104. doi: 10.1088/1674-1137/ac69ba

**Abstract:**

In this paper, we show using several examples that the bulk geometry of asymptotically AdS

2022, 46(8): 085105. doi: 10.1088/1674-1137/ac6d4f

**Abstract:**

In this study, we explore the axion-like particle (ALP)-photon oscillation effect in the

*γ*-ray spectra of the blazars Markarian 421 (Mrk 421) and PG 1553+113, which are measured by the Major Atmospheric Gamma Imaging Cherenkov Telescopes (MAGIC) and Fermi Large Area Telescope (Fermi-LAT) with high precision. The Mrk 421 and PG 1553+113 observations of 15 and five phases are used in the analysis, respectively. We find that the combined analysis with all the 15 phases improves the limits of the Mrk 421 observations. For the selected blazar jet magnetic field and extragalactic background light models, the combined limit set by the Mrk 421 observations excludes the ALP parameter region with the ALP-photon coupling of

2022, 46(8): 085106. doi: 10.1088/1674-1137/ac67fe

**Abstract:**

In this paper, by exploring photon motion in the region near a Bardeen black hole, we studied the shadow and observed properties of the black hole surrounded by various accretion models. We analyzed the changes in shadow imaging and observed luminosity when the relevant physical parameters are changed. For the different spherical accretion backgrounds, we find that the radius of shadow and the position of the photon sphere do not change, but the observed intensity of shadow in the infalling accretion model is significantly lower than that in the static case. We also studied the contribution of the photon rings, lensing rings and direct emission to the total observed flux when the black hole is surrounded by an optically thin disk accretion. Under the different forms of the emission modes, the results show that the observed brightness is mainly determined by direct emission, while the lensing rings will provide a small part of the observed flux, and the flux provided by the photon ring is negligible. By comparing our results with the Schwarzschild spacetime, we find that the existence or change of relevant status parameters will greatly affect the shape and observed intensity of the black hole shadow. These results support the theory that the change of state parameter will affect the spacetime structure, thus affecting the observed features of black hole shadows.

2022, 46(8): 085107. doi: 10.1088/1674-1137/ac6574

**Abstract:**

The prospect of using gravitational wave detections via the quasinormal modes (QNMs) to test modified gravity theories is exciting area of current research. Gravitational waves (GWs) emitted by a perturbed black hole (BH) will decay as a superposition of their QNMs of oscillations at the ringdown phase. In this work, we investigate the QNMs of the Einstein-Euler-Heisenberg (EEH) BH for both axial and polar gravitational perturbations. We obtain master equations with the tetrad formalism, and the quasinormal frequencies of the EEH BH are calculated in the 6th order Wentzel-Kramers-Brillöuin approximation. It is interesting to note that the QNMs of the EEH BH would differ from those of the Reissner-Nordström BH under the EH parameter, which indicates the EH parameter would affect the gravitational perturbations for the EEH BH.

**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

Author benefits

- A SCOAP3 participating journal - free Open Access publication for qualifying articles
- Average 24 days to first decision
- Fast-track publication for selected articles
- Subscriptions at over 3000 institutions worldwide
- Free English editing on all accepted articles

News

- Chinese Physics C Outstanding Reviewer Award 2023
- Impact factor of Chinese Physics C is 3.6 in 2022
- 2022 CPC Outstanding Reviewer Awards
- The 2023 Chinese New Year-Office closure
- ãChinese Physics CãBEST PAPER AWARDS 2022

Meet Editor