Chinese Physics C

Journal Information
ISSN / EISSN : 1674-1137 / 2058-6132
Published by: IOP Publishing (10.1088)
Total articles ≅ 3,478
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Ziyi Yuan, Dong Bai, , Zhen Wang
Published: 22 October 2021
Abstract:
Neutron-deficient actinide nuclei provide a valuable window to probe heavy nuclear systems with large proton-neutron ratios. In recent years, several new neutron-deficient Uranium and Neptunium isotopes have been observed via α-decay spectroscopy [Z. Y. Zhang et al., Phys. Rev. Lett. 122, 192503 (2019); L. Ma et al., Phys. Rev. Lett. 125, 032502 (2020); Z. Y. Zhang et al., Phys. Rev. Lett. 126, 152502 (2021)]. In spite of these achievements, some neutron-deficient key nuclei in this mass region are still unknown in experiments. Machine learning algorithms have been applied successfully in different branches of modern physics. It is interesting to explore their applicability in α-decay studies. In this work, we propose a new model to predict α-decay energies and half-lives within the framework based on a machine learning algorithm called the Gaussian process. We first calculate the α-decay properties of the new actinide nucleus 214U. The theoretical results turn out to be in good agreement with the latest experimental data, which shows the reliability of our model. We continue to use the model to predict α-decay properties of some unknown neutron-deficient actinide isotopes and compare the results with traditional models. The results could be useful for future synthesis and identification of these unknown isotopes.
Qu-Zhi Li, Yao Ma, Wen-Qi Niu, Yu-Fei Wang, Han-Qing郑汉青Zheng
Published: 21 October 2021
Abstract:
Extensive dynamical $N/D$ calculations are made in the study of $S_{11}$ channel low energy $\pi$N scatterings, based on various phenomenological model inputs of left cuts at tree level. The subtleties of the singular behavior of the partial wave amplitude at the origin of the complex $s$ plane are carefully analysed. Furthermore, it is found that the dispersion representation for the phase shift, $\delta$, has to be modified in the case of $\pi $N scatterings. An additional contribution from the dispersion integral exists, which is, however, almost exactly cancelled the contribution from two virtual poles located near the end points of the segment cut induced by $u$ channel nucleon exchanges. Relying very little on the details of the dynamical inputs, the subthreshold resonance $N^*(890)$ survives.
Xiang-Nan Zhou, Yun-Zhi Du, Zhen-Hua Zhao
Published: 20 October 2021
Abstract:
Due to the special structure of a five-dimensional Elko spinor, its localization on a brane with codimension one becomes completely different from that of Dirac spinor. By introducing the coupling between the Elko spinor and the scalar field that can generate the brane, we have two kinds of localization mechanism for the five-dimensional Elko spinor zero mode on a brane. One is the Yukawa-type coupling, the other is the non-minimal coupling. In this paper, we investigate the localization of the Elko zero mode on de Sitter and Anti-de Sitter thick branes with two localization mechanisms, respectively. The results show that both two mechanisms can realize the localization. The forms of the scalar coupling function in two mechanisms have the similar properties, and they play similar role in localization. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.
Kai-Lei Wang, Xian-Hui Zhong
Published: 20 October 2021
Abstract:
In this work, by combing the equal spacing rule with the recent observations of the $\Omega_c^*(X)$ and $\Xi_c^*(X)$ baryons we predict a spectrum of the low-lying $\lambda$-mode $1P$-wave excited $\Sigma_c$ states. Furthermore, their strong decay properties are predicted within the chiral quark model. The nature of $\Sigma_c(2800)$ is also discussed by analyzing the $\Lambda_c\pi$ invariant mass spectrum. It is found that the $\Sigma_c(2800)$ structure observed in the $\Lambda_c \pi$ mass spectrum might arise from two overlapping $P$-wave $\Sigma_c$ resonances $\Sigma_c(2813)3/2^-$ and $\Sigma_c(2840)5/2^-$. These two resonances have a comparable decay width of $\Gamma\sim 40$ MeV and dominantly decay into the $\Lambda_c \pi$ channel. The $\Sigma_c(2755)1/2^-$ state may be a very narrow state with a width of $\Gamma\sim 15$ MeV, its decays are nearly saturated by the $\Lambda_c \pi$ channel. Obvious evidence of the $\Sigma_c(2755)\frac{1}{2}^-$ resonance, as a very narrow peak, may be seen in the $\Lambda_c\pi$ invariant mass spectrum. The other two $P$-wave states $\Sigma_c(2746)\frac{1}{2}^-$ and $\Sigma_c(2796)\frac{3}{2}^-$ are relatively narrow states with comparable widths of $\Gamma\sim 30$ MeV, they mainly decay into $\Sigma_c\pi$ and $\Sigma^{*}_c\pi$, respectively. We hope our study can provide useful references for establishing these low-lying $P$-wave states in forthcoming experiments.
Xuan Luo,
Published: 20 October 2021
Abstract:
In this paper we study the Kotzinian-Mulders effect in semi-inclusive deep inelastic scattering (SIDIS) within the framework of transverse momentum dependent (TMD) factorization. The asymmetry is contributed by the convolution of the Kotzinian-Mulders function $g_{1T}$ and the unpolarized fragmentation function $D_1$. As a TMD distribution, the Kotzinian-Mulders function in the coordinate space in the perturbative region can be represented as the convolution of the $C$-coefficients and the corresponding collinear correlation function. The Wandzura-Wilczek approximation is used to obtain this correlation function. We perform a detailed phenomenological numerical analysis of the Kotzinian-Mulders effect in the SIDIS process within TMD factorization at the kinematics of the HERMES and COMPASS experiments. It is found that the obtained $x_B$-, $z_h$- and $P_{h\perp}$-dependent Kotzinian-Mulders effect are basically consistent with the HERMES and COMPASS measurements. We also make predictions in EIC and EicC kinematics. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.
Khepani Raya, Zhu-Fang Cui, , Jose-Manuel Morgado, , Jose Rodriguez-Quintero
Published: 18 October 2021
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 \emph{Ans\"atze}, constrained entirely by hadron-scale $\pi$ and $K$ 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 $\pi$ profiles, with both mesons sustaining near-core pressures at magnitudes similar to that expected at the core of neutron stars; deliver parameter-free predictions for $\pi$ and $K$ valence, glue, and sea GPDs at the resolving scale $\zeta=2\,$GeV; and predict that at this scale the fraction of meson mass-squared carried by glue and sea combined matches that lodged with the valence degrees-of-freedom, with a similar statement holding for mass-squared radii. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.
Jiarong袁家荣Yuan, Hua-Jie Cheng,
Published: 14 October 2021
Abstract:
The proposed Circular Electron Positron Collider (CEPC), with a center-of-mass energy $\sqrt{s} = 240$ GeV, will primarily serve as a Higgs factory. At the same time, it can offer good opportunities to search for new physics phenomena at low energy, which can be challenging to discover at hadron colliders, but well motivated by some theoretical models developed to explain, e.g., the relic abundance of dark matter. This paper presents sensitivity studies of chargino pair production, considering scenarios for both a Bino-like and a Higgsino-like neutralino as the lightest supersymmetric particle, using full Monte Carlo (MC) simulation. With the assumption of systematic uncertainties at the level of 5\%, the CEPC has the ability to discover chargino pair production up to the kinematic limit of $\sqrt{s}/2$ for both scenarios. The results have a minor dependence on the reconstruction model and detector geometry. These results can also be considered as a reference and benchmark for similar searches at other proposed electron-positron colliders, such as the Future Circular Collider ee (FCC-ee) or the International Linear Collider (ILC), particularly given the similar nature of the facilities, detectors, center-of-mass energies, and target luminosities. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.
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