Impact factor of Chinese Physics C is 3.6 in 2022 2021 Impact Factor 2.944
Advanced Search
Highlights
  • Solar neutrino background in high-pressure gaseous 82SeF6 TPC neutrinoless double beta decay experiments
    Jiemiao Wang, Hulin Wang, Dongliang Zhang
    2024, 48(4): 043003. doi: 10.1088/1674-1137/ad2675
    In this study, the possibility of observing a solar neutrino background in a future neutrinoless double beta decay experiment using a high-pressure gaseous 82SeF6 TPC is investigated. Various contributions are simulated, and possible features that could be used for event classification are discussed; two types of backgrounds are identified. The rate of multi-site background events is approximately 0.63 events/(ton·yr) in a 30 keV ROI window. This background could be effectively reduced to less than 0.0001 events/(ton·yr) (95% C.L.) while maintaining a high signal efficiency of 93% by applying a selection based on the number of clusters and energy of the leading cluster. The rate of the single-electron background events is approximately 0.01 events/(ton·yr) in the ROI. Assuming a reduction factor of 10 for the single-electron background events obtained via the algorithms developed for radioactive background rejection, the total background induced by the solar neutrino would be 0.001 events/(ton·yr), which is sufficiently small for conducting ton-level experiments.
  • Gravitational wave footprints from Higgs-portal scalegenesis with multiple dark chiral scalars
    He-Xu Zhang, Shinya Matsuzaki, Hiroyuki Ishida
    2024, 48(4): 045106. doi: 10.1088/1674-1137/ad2b4f
    We discuss the gravitational wave (GW) spectra predicted from the electroweak scalegenesis of the Higgs portal type with a large number of dark chiral flavors, which many flavor QCD would underlie and give the dynamical explanation of the negative Higgs portal coupling required to trigger the electroweak symmetry breaking. We employ the linear-sigma model as the low-energy description of dark many flavor QCD and show that the model undergoes ultra-supercooling due to the produced strong first-order thermal phase transition along the (approximately realized) flat direction based on the Gildener-Weinberg mechanism. Passing through evaluation of the bubble nucleation/percolation, we address the reheating and relaxation processes, which are generically non-thermal and nonadiabatic. Parametrizing the reheating epoch in terms of the e-folding number, we propose proper formulae for the redshift effects on the GW frequencies and signal spectra. It then turns out that the ultra-supercooling predicted from the Higgs-portal scalegenesis generically yields none of GW signals with the frequencies as low as nano Hz, unless the released latent heat is transported into another sector other than reheating the universe. Instead, models of this class prefer to give the higher frequency signals and still keeps the future prospected detection sensitivity, like at LISA, BBO, and DECIGO, etc. We also find that with large flavors in the dark sector, the GW signals are made further smaller and the peak frequencies higher. Characteristic phenomenological consequences related to the multiple chiral scalars include the prediction of dark pions with the mass much less than TeV scale, which is also briefly addressed.
  • Correlations of baryon and charge stopping in heavy ion collisions
    Wendi Lv, Yang Li, Ziyang Li, Rongrong Ma, Zebo Tang, Prithwish Tribedy, Chun Yuen Tsang, Zhangbu Xu, Wangmei Zha
    2024, 48(4): 044001. doi: 10.1088/1674-1137/ad243f
    Baryon numbers are theorized to be carried by valence quarks in the standard QCD picture of the baryon structure. Another theory proposed an alternative baryon number carrier, a non-perturbative Y-shaped configuration of the gluon field, called the baryon junction in the 1970s. However, neither of these theories has been verified experimentally. Recently, searching for the baryon junction by investigating the correlation of net-charge and net-baryon yields at midrapidity in heavy-ion collisions has been suggested. This paper presents studies of such correlations in collisions of various heavy ions from oxygen to uranium with the UrQMD Monte Carlo model. The UrQMD model implements valence quark transport as the primary means of charge and baryon stopping at midrapidity. Detailed studies are also conducted for isobaric $ _{40}^{96}{\rm{Zr}} $ + $ _{40}^{96}{\rm{Zr}} $ and $ _{44}^{96}{\rm{Ru}} $ + $ _{44}^{96}{\rm{Ru}} $ collisions. We found a universal trend of charge stopping with respect to baryon stopping and discovered that the charge stopping is always greater than the baryon stopping. This study provides a model baseline in valence quark transport for what is expected in net-charge and net-baryon yields at the midrapidity of relativistic heavy-ion collisions.
Just Accepted
More >
Recent
More >
  • Observational appearance and extra photon rings of an asymmetric thin-shell wormhole with a Bardeen profile
    Ke-Jian He, Zhi Luo, Sen Guo, Guo-Ping Li
    2024, 48(6): 065105-065105-11. doi: 10.1088/1674-1137/ad34bf
    Show Abstract
    In this work, the optical appearance of an asymmetric thin-shell wormhole with a Bardeen profile is studied. To initiate the process, we need to construct an asymmetric thin-shell wormhole utilizing the cut-and-paste technique proposed by Visser and subsequently ascertain its pertinent physical quantities such as the radius of the photon sphere and critical impact parameters for different values of magnetic charge g. Then, the effective potential and motion behavior of photons are also investigated within the framework of asymmetric thin-shell wormholes with a Bardeen profile. It can be found that the effective potential, ray trajectory, and azimuthal angle of the thin-shell wormhole exhibit a strong correlation with the mass ratio of black holes. By considering the accretion disk as the sole background light source, we observe additional photon rings and lensing bands in the optical appearance of the asymmetric thin-shell wormhole with a Bardeen profile compared to those exhibited by the Bardeen black hole. One can find that there is an increase in the size of the specific additional light bands with increasing magnetic charge g, which is different from the black hole case. These exceptionally luminous rings can serve as a robust criterion for the identification and characterization of the thin-shell wormhole spacetime.
  • Systematic study of cluster radioactivity within the generalized liquid drop model
    Jun-Gang Deng, Jun-Hao Cheng, Xiao-Jun Bao, Hong-Fei Zhang
    2024, 48(6): 064101-064101-12. doi: 10.1088/1674-1137/ad30ef
    Show Abstract
    Cluster radioactivity is studied within the generalized liquid drop model (GLDM), in which the shell correction energy, pairing energy, and cluster preformation factor are considered. The calculations show significant improvements and can reproduce the experimental data within a factor of 8.04 after considering these physical effects. In addition, the systematic trend of the cluster preformation factors $ P_c $ is discussed in terms of the $ N_p N_n $ scheme to study the influence of the valence proton-neutron interaction and shell effect on cluster radioactivity. It is found that $ \log_{10}{P_c} $ is linearly related to $ N_p N_n $. This is in agreement with a recent study [L. Qi et al., Phys. Rev. C 108, 014325 (2023)], in which $ \log_{10}{P_c} $, obtained using different theoretical models and treatment methods than those used in this study, also had a linear relationship with $ N_p N_n $. Combined with the work by Qi et al., this study suggests that the linear relationship between $ \log_{10}{P_c} $ and $ N_p N_n $ is model-independent and both the shell effect and valence proton-neutron interaction play essential roles in cluster radioactivity. An analytical formula is proposed to calculate the cluster preformation factor based on the $ N_p N_n $ scheme. In addition, the cluster preformation factors and the cluster radioactivity half-lives of some heavy nuclei are predicted, which can provide a reference for future experiments.
  • X(3960), X0(4140), and other compact ${\boldsymbol c \boldsymbol s\bar{\boldsymbol c}\bar{\boldsymbol s}} $ states
    Shi-Yuan Li, Yan-Rui Liu, Zi-Long Man, Zong-Guo Si, Jing Wu
    2024, 48(6): 063109-063109-10. doi: 10.1088/1674-1137/ad34c4
    Show Abstract
    We studied the spectrum and rearrangement decays of S-wave $ cs\bar{c}\bar{s} $ tetraquark states in a simplified quark model. The masses and widths were estimated by assuming that $ X(4140) $ is the lower $ 1^{++} \;\; cs\bar{c}\bar{s} $ tetraquark. Comparing our results with experimental measurements, we found that $ X(3960) $, recently observed by LHCb, can be considered the lowest $ 0^{++} \;\; cs\bar{c}\bar{s} $ tetraquark state and $ X_0(4140) $ could be the second lowest $ 0^{++} \;\; cs\bar{c}\bar{s} $ tetraquark. Predictions of ratios between partial widths for the involved tetraquarks are provided in this paper. We aim to identify more $ cs\bar{c}\bar{s} $ tetraquarks with $ J^{PC}=1^{+-} $, $ 0^{++} $, and $ 2^{++} $.
Current Issued
Chinese Physics C
2024 Vol. 48, No. 4
Published: 01 April 2024
Archive
Chinese Physics C
IF: 3.6

Monthly founded in 1977

Sponsored by:

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
News
More
Cover Story
More

Advertising

Advertising
Link
IOPScience
SCOAP3
arXiv
Chinese Physical Society
Journal information
Introduction
Editorial Board
Others
Subscribe
Contact us
QQ: 1307685413
Tel: +86-010-88235947
Fax: +86-010-88233126
E-mail: cpc@ihep.ac.cn

  • CPC Website

  • IOP Website

  • CPC WeChat

Copyright © Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing 100049, China 京ICP备05002789号-1

Supported by: Beijing Renhe Information Technology Co. Ltd  E-mail: info@rhhz.net