## 2022 Vol. 46, No. 1

Display Method: |

2022, 46(1): 011001. doi: 10.1088/1674-1137/ac2a25

**Abstract:**

The latest measurements of the anomalous muon magnetic moment

2022, 46(1): 011002. doi: 10.1088/1674-1137/ac2b12

**Abstract:**

While the standard model is the most successful theory to describe all the interactions and constituents of elementary particle physics, it has been constantly scrutinized for over four decades. Weak decays of charm quarks can be used to measure the coupling strength between quarks in different families and serve as an ideal probe for CP violation. As the lowest charm-strange baryons with three different flavors,

*ab-initio*lattice QCD calculation of the

2022, 46(1): 012001. doi: 10.1088/1674-1137/ac2ed1

**Abstract:**

The same-sign tetralepton signature via the mixing of neutral Higgs bosons and their cascade decays to charged Higgs bosons is a unique signal in the type-II seesaw model with the mass spectrum

2022, 46(1): 013101. doi: 10.1088/1674-1137/ac2ffa

**Abstract:**

We adopt a bottom-up Effective Field Theory (EFT) approach to derive a model-independent Veltman condition to cancel out the quadratic divergences in the Higgs mass. We show using the equivalence theorem that all the deviations in the Higgs couplings to the

2022, 46(1): 013102. doi: 10.1088/1674-1137/ac2ed0

**Abstract:**

Using an extended chromomagnetic model, we perform a systematic study of the masses of doubly heavy tetraquarks. We find that the ground states of the doubly heavy tetraquarks are dominated by the color-triplet

2022, 46(1): 013103. doi: 10.1088/1674-1137/ac2ed3

**Abstract:**

The Nambu–Jona-Lasinio (NJL) model is one of the most useful tools for studying non-perturbative strong interactions in matter. Because it is a nonrenormalizable model, the choice of regularization is a subtle issue. In this paper, we discuss one of the general issues regarding regularization in the NJL model, which is whether we need to use regularization for the thermal part by evaluating the quark chiral condensate and thermal properties in the two-flavor NJL model. The calculations in this work include three regularization schemes that contain both gauge covariant and invariant schemes. We found that, regardless of the regularization scheme we choose, it is necessary to use regularization for the thermal part when calculating physical quantities related to the chiral condensate and to not use regularization for the thermal part when calculating physical quantities related to the grand potential.

2022, 46(1): 013104. doi: 10.1088/1674-1137/ac2f93

**Abstract:**

The proposed Circular Electron Positron Collider (CEPC) with a center-of-mass energy

2022, 46(1): 013105. doi: 10.1088/1674-1137/ac3071

**Abstract:**

Clear windows onto emergent hadron mass (EHM) and modulations thereof by Higgs boson interactions are provided by observable measures of pion and kaon structure, many of which are accessible via generalised parton distributions (GPDs). Beginning with algebraic GPD

*Ansätze*, constrained entirely by hadron-scale

*K*valence-parton distribution functions (DFs), in whose forms both EHM and Higgs boson influences are manifest, numerous illustrations are provided. They include the properties of electromagnetic form factors, impact parameter space GPDs, gravitational form factors and associated pressure profiles, and the character and consequences of all-orders evolution. The analyses predict that mass-squared gravitational form factors are stiffer than electromagnetic form factors; reveal that

*K*pressure profiles are tighter than

*K*valence, glue, and sea GPDs at the resolving scale

2022, 46(1): 014001. doi: 10.1088/1674-1137/ac2a95

**Abstract:**

The photoneutron reaction

*γ*-activity method. The bremsstrahlung flux-averaged cross-sections

2022, 46(1): 014002. doi: 10.1088/1674-1137/ac2ed4

**Abstract:**

Experimentally measured neutron activation cross sections are presented for the

*n*,

*α*)

*n*,

*α*)

*n*,

*2n*)

*t*(

*d*,

*n*)

*α*fusion reaction. The

*n*,

*α*)

*γ*-ray spectra. The data from the measured cross sections are compared to the previously measured cross sections from the EXFOR database, theoretically calculated cross sections using the TALYS and EMPIRE codes, and evaluated nuclear data.

2022, 46(1): 014003. doi: 10.1088/1674-1137/ac2ed5

**Abstract:**

The elemental fragmentation cross sections of boron fragments produced by stable and neutron-rich

^{12-16}C beams with a carbon target were systematically measured at an incident beam energy of approximately 240 MeV/nucleon. The measured cross sections were found to increase as the projectile mass number increases. The observed feature is explained qualitatively based on the abrasion-ablation two-stage reaction model and is compared quantitatively with predictions from various reaction models, including empirical and statistical models. All models agree with the measured cross sections within a factor of 2.

2022, 46(1): 014004. doi: 10.1088/1674-1137/ac2ff9

**Abstract:**

Understanding the EMC effect and its relation to the short-range nucleon-nucleon correlations (SRC) in nuclei is a major challenge for modern nuclear physics. One of the key aspects of the connection between these phenomena is the universality. The universality states that the SRC is responsible for the EMC effect and that the modification of the partonic structure of the SRC is the same in different nuclei. The flavor dependence of the universality is one of the unanswered questions. The investigations conducted to date have demonstrated the existence and universality of the SRC for light

*X*structure of the SRC and to establish universality for heavy flavors using nuclear semi-inclusive deep inelastic scattering (nSIDIS), which probes different quark flavor combinations depending on the final state hadron. The specific reaction can be "tagged" by observation of a strange or charmed particle registered in coincidence with the scattering lepton. The universality of the SRC can be tested in the kinematic region, i.e.,

2022, 46(1): 014101. doi: 10.1088/1674-1137/ac2a1f

**Abstract:**

The chiral magnetic effect (CME) is a novel transport phenomenon, arising from the interplay between quantum anomalies and strong magnetic fields in chiral systems. In high-energy nuclear collisions, the CME may survive the expansion of the quark-gluon plasma fireball and be detected in experiments. Over the past two decades, experimental searches for the CME have attracted extensive interest at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC). The main goal of this study is to investigate three pertinent experimental approaches: the

*R*correlator, and the signed balance functions. We exploit simple Monte Carlo simulations and a realistic event generator (EBE-AVFD) to verify the equivalence of the core components among these methods and to ascertain their sensitivities to the CME signal and the background contributions for the isobar collisions at the RHIC.

2022, 46(1): 014102. doi: 10.1088/1674-1137/ac2ed2

**Abstract:**

The deformation and associated optimum/uniquely fixed orientations play an important role in the synthesis of compound nuclei via cold and hot fusion reactions, respectively, at the lowest and highest barrier energies. The choice of optimum orientation (

**31**, 631-644 (2005)]. In our recent study [Phys. Rev. C

**101**, 051601(R) 2020], we proposed a new set of

^{16}O,

^{48}Ca+octupole deformed nuclei. Compared with the compact configuration, the elongated fusion configuration has a relatively larger impact on the fusion barrier and cross-sections owing to the inclusion of deformations up to

^{16}O+

^{150}Sm reaction (

2022, 46(1): 014103. doi: 10.1088/1674-1137/ac2f2a

**Abstract:**

Within our aim to clarify some aspects of the breakup dynamics of loosely-bound neutron-halo projectiles on a heavy target, we apply the continuum discretized coupled-channel formalism to investigate the beryllium

^{11}Be breakup on a lead

^{208}Pb target at

2022, 46(1): 014104. doi: 10.1088/1674-1137/ac2f94

**Abstract:**

It is known that elastic magnetic electron scattering can be used to study the magnetic properties of nuclei and determine the outermost-shell single-particle orbitals. In this study, the magnetic form factors

*A*nuclei calculated with relativistic and non-relativistic models are systematically compared. We use the relativistic mean-field (RMF) and Skyrme Hartree-Fock (SHF) models to generate single-particle wave functions and calculate the

2022, 46(1): 014105. doi: 10.1088/1674-1137/ac2f95

**Abstract:**

In the contact interaction model, the quark propagator has only one solution, namely, the chiral symmetry breaking solution, at vanishing temperature and density in the case of physical quark mass. We generalize the condensate feedback onto the coupling strength from the 2 flavor case to the 2+1 flavor case, and find the Wigner solution appears in some regions, which enables us to tackle chiral phase transition as two-phase coexistences. At finite chemical potential, we analyze the chiral phase transition in the conditions of electric charge neutrality and

2022, 46(1): 014106. doi: 10.1088/1674-1137/ac3072

**Abstract:**

The isospin dependence of spin-orbit (SO) splitting becomes increasingly important as

*N/Z*increases in neutron-rich nuclei. Following the initial independent-particle strategy toward explaining the occurrence of magic numbers, we systematically investigated the isospin effect on the shell evolution in neutron-rich nuclei within the Woods-Saxon mean-field potential and the SO term. It is found that new magic numbers

*N*= 14 and

*N*=16 may emerge in neutron-rich nuclei if one changes the sign of the isospin-dependent term in the SO coupling, whereas the traditional magic number,

*N*= 20, may disappear. The magic number

*N*= 28 is expected to be destroyed despite the sign choice of the isospin part in the SO splitting, corresponding to the strength of the SO coupling term. Meanwhile, the

*N*= 50 and 82 shells may persist within the single particle scheme, although there is a decreasing trend of their gaps toward extreme proton-deficient nuclei. Besides, an appreciable energy gap appears at

*N*= 32 and 34 in neutron-rich Ca isotopes. All these results are more consistent with those of the interacting shell model when enhancing the strength of the SO potential in the independent particle model. The present study may provide a more reasonable starting point than the existing one for not only the interacting shell model but also other nuclear many-body calculations toward the neutron-dripline of the Segrè chart.

2022, 46(1): 015101. doi: 10.1088/1674-1137/ac2e66

**Abstract:**

The energy content of the charged-Kerr (CK) spacetime surrounded by dark energy (DE) is investigated using approximate Lie symmetry methods for the differential equations. For this, we consider three different DE scenarios: cosmological constant with an equation of state parameter

*ω*, the exact symmetries are recovered as 2nd-order approximate trivial symmetries. These trivial approximate symmetries give the rescaling of arc length parameter

*s*in this spacetime which indicates that the energy in the underlying spacetime has to be rescaled by a factor that depends on the black hole parameters and the DE parameter. This rescaling factor is compared with the factor of the CK spacetime found in [Hussain

*et al*. Gen. Relativ. Gravit. (2009)] and the effects of the DE on it are discussed. It is observed that for all the three values of the equation of state parameter

*ω*, the effect of DE results in decreased energy content of the black hole spacetime, regardless of values of the charge

*Q*, spin

*a*and the DE parameter

*α*. This reduction in the energy content due to the involvement of the DE favours the idea of mass reduction of black holes by accretion of DE given by [Babichev

*et al*. Phys. Rev. Lett. (2004)].

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

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