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  • Characterizing the CJPL’s site-specific neutrino floor as the neutrino fog boundary
    2025, 49(10): 103001-103001-8. doi: 10.1088/1674-1137/ade65e
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    The neutrino floor, a theoretical sensitivity limit for dark matter (DM) direct detection, is being redefined as the boundary of a dynamic ''neutrino fog,'' where neutrino signals become inevitable, obscuring DM detection due to statistical and systematic uncertainties. This study provides the first site-specific analysis of the neutrino floor at China Jinping Underground Laboratory (CJPL), leveraging its unique geographic and environmental characteristics. We quantify how CJPL’s suppressed atmospheric neutrino flux (approximately 30% lower than that of Laboratori Nazionali del Gran Sasso (LNGS)) reshapes the neutrino floor, thereby enabling improved sensitivity to high-mass WIMPs (mass > 10 GeV). Using a gradient-based framework, we derive the CJPL’s neutrino floor and estimate the detection prospects for the PandaX-xT experiment. Our results demonstrate that a 500 tonne-year exposure with PandaX-xT could reach the floor, probing spin independent cross-sections down to $ \sigma_{n}\sim 3\times 10^{-49}\; {\rm{cm}}^2$ at a DM mass of 70 GeV/c2.
  • Revisiting the deuteron mass radius via near-threshold ρ0, ω, and ϕ meson photoproduction
    2025, 49(10): 103105-103105-9. doi: 10.1088/1674-1137/ade1c9
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    We present a comprehensive analysis of near-threshold photoproduction of $\rho^0$, ω, and ϕ mesons on a deuterium target, utilizing published datasets from DESY and SLAC for $\rho^0$ and ω production, as well as data from the LEPS and CLAS Collaborations for ϕ production. In extracting the deuteron mass radius, we adopt a dipole parameterization for the scalar gravitational form factor, which effectively captures the $|t|$-dependence of the differential cross sections associated with vector meson photoproduction. In addition, results from alternative commonly used form factor parameterizations are considered and compared. By employing the vector meson dominance (VMD) framework and invoking low-energy Quantum Chromodynamics (QCD) theorems, we extract the deuteron mass radius from near-threshold photoproduction data of $\rho^0$, ω, and ϕ mesons. The mass radii obtained from the various datasets are found to be consistent within statistical uncertainties, yielding an average value of $2.03 \pm 0.13$ fm under the dipole form assumption. We also provide a detailed discussion of the sensitivity of the extracted radius to the choice of gravitational form factor models. Our result represents a significant improvement in precision compared to earlier estimates based solely on ϕ meson photoproduction, offering new constraints for theoretical models of nuclear structure and deepening our understanding of the mass distribution within the deuteron.
  • Two-body strong decays of the hidden-charm tetraquark molecular states via QCD sum rules
    2025, 49(10): 103104-103104-11. doi: 10.1088/1674-1137/add912
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    In this study, we extend our previous study on the $ D^*\bar{D}^* $ molecular states with $ J^{PC}=0^{++} $, $ 1^{+-} $, and $ 2^{++} $to investigate their two-body strong decays via the QCD sum rules based on rigorous quark-hadron duality. We obtain the partial decay widths and, therefore, the total widths of the ground states with $ J^{PC}=0^{++} $, $ 1^{+-} $, and $ 2^{++} $, which indicate that it is reasonable to assign $ X_2(4014) $ as the $ D^*\bar{D}^* $ tetraquark molecular states with $ J^{PC}=2^{++} $.
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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
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