Chinese Physics C

Highlights

Lattice QCD study of Λ_cΛ_c scattering
Hanyang Xing, Yiqi Geng, Chuan Liu, Liuming Liu, Peng Sun, Jiajun Wu, Zhicheng Yan, Ruilin Zhu

2025, 49(6): 063107. doi: 10.1088/1674-1137/adc11f

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We present the first lattice result of the near threshold $ \Lambda_c\Lambda_c $ scattering with $ I(J^P) = 0(0^+) $. The calculation is performed on two $ N_f = 2+1 $ Wilson-Clover ensembles with pion mass $ m_\pi \sim 303 $ MeV and lattice spacing $ a = 0.07746 $ fm. Lüscher's finite volume method is utilized to extract the scattering parameters from the finite-volume spectrum. The coupled channel $ \Xi_{cc}N $ is ignored in the scattering analysis based on the observation that the energy levels computed from the $ \Lambda_c\Lambda_c $ and $ \Xi_{cc}N $ operators do not mix. The $ \Sigma_c\Sigma_c $ channel is not included either since the energy range explored in this study is well below its threshold. Our results indicate that the interaction in the $ \Lambda_c\Lambda_c $ single channel is repulsive, and the scattering length is determined to be $ a_0 = -0.21(4)(8) $ fm, where the first error is statistical and the second is systematic.
New constraints on coherent elastic neutrino–nucleus scattering by the νGeN experiment
V. Belov, A. Bystryakov, M. Danilov, S. Evseev, M. Fomina, G. Ignatov, S. Kazartsev, J. Khushvaktov, T. Khussainov, A. Konovalov, A. Kuznetsov, A. Lubashevskiy, D. Medvedev, D. Ponomarev, D. Sautner, K. Shakhov, E. Shevchik, M. Shirchenko, S. Rozov, I. Rozova, S. Vasilyev, E. Yakushev, I. Zhitnikov, D. Zinatulina, (νGeN Collaboration)

2025, 49(5): 053004. doi: 10.1088/1674-1137/adb9c8

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The $ \nu $GeN experiment searches for coherent elastic neutrino-nucleus scattering (CE$ \nu $NS) at the Kalinin Nuclear Power Plant. A 1.41 kg high-purity low-threshold germanium detector surrounded by active and passive shielding is deployed at the minimal distance of 11.1 m allowed by the lifting mechanism from the center of the reactor core, utilizing one of the highest antineutrino fluxes among competing experiments. The direct comparison of the count rates obtained during reactor-ON and reactor-OFF periods with the energy threshold of 0.29 keV$ _{ee} $ shows no statistically significant difference. New upper limits on the number of CE$ \nu $NS events are evaluated on the basis of the residual ON$ - $OFF count rate spectrum.
Model-independent constraints on the Hubble constant using lensed quasars and the latest supernova
Liang Liu, Ai-Yang Bi, Li Tang, Ying Wu

2025, 49(5): 055107. doi: 10.1088/1674-1137/adbc87

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The Hubble constant $H_0$, a key parameter quantifying the present expansion rate of the universe, remains a subject of significant debate due to the persistent tension between early- and late-universe measurements. Strong gravitational lensing (SGL) time delays provide an independent avenue to constrain $H_0$. In this paper, we utilize seven SGL systems from the TDCOSMO sample to constrain $H_0$, employing the model-independent approaches: deep neural networks (DNN), Gaussian process (GP), polynomial fitting (polyfit) and Padé approximant (PA). Using these methods, we reconstruct unanchored luminosity distances from the Pantheon+ SNe Ia dataset and obtain $H_0=72.3^{+3.8}_{-3.6}$ km s⁻¹ Mpc⁻¹, $H_0=72.4^{+1.6}_{-1.7}$ km s⁻¹ Mpc⁻¹, $H_0=70.7^{+3.0}_{-3.1}$ km s⁻¹ Mpc⁻¹ and $H_0=74.0^{+2.7}_{-2.7}$ km s⁻¹ Mpc⁻¹, respectively. These estimates are consistent within 1σ level and align with local distance ladder results. Notably, the GP method achieves uncertainties that are half those of the DNN approach, whereas the DNN method offers more reliable confidence intervals in reconstruction at high redshifts. Our findings underscore the potential of these methodologies to refine constraints on $H_0$ and contribute to resolving the Hubble tension with future advancements.

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Extracting the neutron skin thickness of ¹²⁴Sn from the ¹²C + ¹²⁴Sn elastic scattering angular distribution
Zhi-Cheng ZHANG, Zhi-Hong LI, Ge-Xing LI, Chen CHEN, Na SONG, Chao DONG, Jun-Wen TIAN, Jia-Ying-Hao LI

Published: 2025-04-27

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Published: 2025-04-27

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Harvesting entanglement from the cylindrical gravitational wave spacetime
Feifan He, Yongjie Pan, Baocheng Zhang

Published: 2025-04-27

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Published: 2025-04-27

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The new Z' boson of the Bestest Little Higgs Model as a portal to signatures of Higgs bosons h₀ and H₀ at the future muon collider
J. M. Martínez-Martínez, A. Gutiérrez-Rodríguezy, E. Cruz-Albaroz, M. A. Hernández-Ruízx

Published: 2025-04-27

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Published: 2025-04-27

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Collective impact of higher-order deformations of target nuclei on the fusion dynamics of heavy-ion induced reactions
Harshit Sharma, Raj Kumar, Manoj K. Sharma

2025, 49(6): 064110-064110-12. doi: 10.1088/1674-1137/adbace

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Several studies on fusion reaction dynamics focused on the impact of quadrupole $\beta_2^{\pm}$ deformation. However, existing literature highlights the importance of the octupole $\beta_3^{\pm}$ and hexadecapole $\beta_4^{\pm}$ deformations associated with both the projectile and target nuclei. However, the collective influence of these deformations ($\beta_2$, $\beta_3$, and $\beta_4$) on the fusion reaction dynamics has not been examined explicitly. In this study, we investigated the collective influence of higher-order deformations up to $\beta_4$ on the barrier characteristics, in particular $V_B$, $R_B$, and $\hbar\omega$, and their impact on the fusion cross-sections of heavy-ion induced reactions in the mass range $163\leq{ {A}}\leq182$. The reactions were examined at both compact and elongated configurations of the deformed nuclei. Heavy ion-induced reactions, which consist of target nuclei with higher-order deformations up to $\beta_4$, reveal a notable alteration in the barrier characteristics $V_B$ and $R_B$, along with a significant change in orientation $\theta_i$ for both compact and elongated configurations. In addition, the incorporation of deformations up to $\beta_4$ and their corresponding orientations $\theta_i$ contributes to enhanced capture cross-sections $\sigma_{cap}$ as well as integrated cross-sections $\sigma_{int.}$, resulting in better agreement with experimental data for $^{16}{\rm{O}}$-induced reactions with $^{148}{\rm{Nd}}$, $^{149-150}{\rm{Sm}}$, and $^{32}{\rm{S}}$-induced reactions with $^{150}{\rm{Sm}}$. We conclude that the incorporation of deformations of all orders up to $\beta_4$ at their optimized compact and elongated configurations is essential because it provides better outcomes compared to the optimized configurations of $\beta_2$ and $\beta_3$ deformed nuclei.

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Strong decays of the fully charmed tetraquark states with explicit P-waves via QCD sum rules
Xiao-Song Yang, Zhi-Gang Wang

2025, 49(6): 063108-063108-10. doi: 10.1088/1674-1137/adc081

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We introduce a relative P-wave to construct the doubly charmed diquark $ (\widetilde{V}) $ vector. Therefore, scalar and tensor four-quark currents were constructed to investigate the decay widths of the fully charmed tetraquark states with $ J^{PC}=0^{++} $, $ 1^{+-} $ and $ 2^{++} $ via quantum chromodynamics (QCD) sum rules. We observed that the total width of the ground state $ \widetilde{V}\overline{\widetilde{V}} $-type scalar tetraquark state is compatible with that of the $ X(6552) $ within uncertainties, and the branching ratios are quite different from that of the first radial excitation of the $ A\bar{A} $-type scalar tetraquark state. Other predictions can be verified in future experiments to shed light on the nature of the fully charmed tetraquark states.

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Electron-ion collision spectroscopy at the CRYRING@ESR electron cooler
C. Brandau, S. Fuchs, V. Hannen, E. O. Hanu, C. Krantz, M. Lestinsky, M. Looshorn, E. B. Menz, S. X. Wang, S. Schippers

2025, 49(6): 064001-064001-9. doi: 10.1088/1674-1137/adbf81

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Electron-ion collision spectroscopy at heavy-ion storage rings aims at precision measurements of resonance features that occur in the cross sections of electron collision processes such as electron-impact ionization of ions or electron-ion recombination. As part of the international Facility for Antiproton and Ion Research (FAIR) project, the low-energy ion storage ring CRYRING@ESR has been coupled with the heavy-ion accelerators operated by the GSI Helmholtz Center for Heavy-Ion Research in Darmstadt, Germany. This has created a new opportunity for stringent strong field quantum electrodynamics tests through electron-ion collision spectroscopy of heavy few-electron ions. The present contribution provides details of the electron-ion collision spectroscopy setup at CRYRING@ESR and associated data-analysis procedures along with first results for nonresonant and resonant recombination of berylliumlike lead ions. A recombination rate enhancement factor of 3.5 was observed for nonresonant recombination at zero electron-ion collision energy. For resonant recombination excellent agreement with recent theoretical results was obtained when these were shifted by 340 meV in energy.

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Current Issued

2025 Vol. 49, No. 4
Published: 28 March 2025

Particles And Fields
Nuclear Physics
Particle And Nuclear Astrophysics And Cosmology