Chinese Physics C: 2019 Reviewer Awards FUTURE PHYSICS PROGRAMME OF BESIII 2018 Impact Factor 5.861
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  • Simple Woods-Saxon-type form for Ωα and Ξα interactions using folding model
    Faisal Etminan, Mohammad Mehdi Firoozabadi
    2020, 44(5): 054106. doi: 10.1088/1674-1137/44/5/054106
    We derive a simple Woods-Saxon-type form for potentials between $Y=\Xi, \Omega$, and $\alpha$ using a single-folding potential method, based on a separable Y-nucleon potential. The potentials $\Xi+\alpha$ and $\Omega+\alpha$ are accordingly obtained using the ESC08c Nijmegens $\Xi N$ potential (in $^{3}S_{1}$ channel) and HAL QCD collaboration $\Omega N$ interactions (in lattice QCD), respectively. In deriving the potential between Y and $\alpha$, the same potential between Y and N is employed. The binding energy, scattering length, and effective range of the Y particle on the alpha particle are approximated by the resulting potentials. The depths of the potentials in $\Omega \alpha $ and $\Xi \alpha $ systems are obtained at $-61$ MeV and $-24.4$ MeV, respectively. In the case of the $\Xi \alpha$ potential, a fairly good agreement is observed between the single-folding potential method and the phenomenological potential of the Dover-Gal model. These potentials can be used in 3-,4- and 5-body cluster structures of $ \Omega$ and $\Xi$ hypernuclei.
  • Sea quark contributions to nucleon electromagnetic form factors with the nonlocal chiral effective Lagrangian
    Ming-Yang Yang, Ping Wang
    2020, 44(5): 053101. doi: 10.1088/1674-1137/44/5/053101
    The sea quark contributions to the nucleon electromagnetic form factors of the up, down and strange quarks are studied with the nonlocal chiral effective Lagrangian. Both octet and decuplet intermediate states are included in the one loop calculations. Compared with the strange quark form factors, although their signs are the same, the absolute value of the light quark form factors are much larger. For both the electric and magnetic form factors, the contribution of the d quark is larger than of the u quark. The current lattice simulations of the light sea quark form factors are in between our results for the u and d quarks.
  • Probe chiral magnetic effect with signed balance function
    A. H. Tang
    2020, 44(5): 054101. doi: 10.1088/1674-1137/44/5/054101
    In this paper a pair of observables are proposed as alternative ways, by examining the fluctuation of net momentum-ordering of charged pairs, to study the charge separation induced by the Chiral Magnetic Effect (CME) in relativistic heavy ion collisions. They are, the out-of-plane to in-plane ratio of fluctuation of the difference between signed balance functions measured in pair’s rest frame, and the ratio of it to similar measurement made in the laboratory frame. Both observables have been studied with simulations including flow-related backgrounds, and for the first time, backgrounds that are related to resonance's global spin alignment. The two observables have similar positive responses to signal, and opposite, limited responses to identifiable backgrounds arising from resonance flow and spin alignment. Both observables have also been tested with two realistic models, namely, a multi-phase transport (AMPT) model and the anomalous-viscous fluid dynamics (AVFD) model. These two observables, when cross examined, will provide useful insights in the study of CME-induced charge separation.
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  • D*Dρ and B*Bρ strong couplings in light-cone sum rules
    Chao Wang, Hua-Dong Li
    Published: 2020-05-18, doi: 10.1088/1674-1137/44/7/073103
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    We present an improved calculation of the strong coupling constants $ g_{D^*D\rho} $ and $ g_{B^*B\rho} $ in light-cone sum rules, including one-loop QCD corrections of leading power with $ \rho $ meson distribution amplitudes. We further compute subleading-power corrections from two-particle and three-particle higher-twist contributions at leading order up to twist-4 accuracy. The next-to-leading order corrections to the leading power contribution numerically offset the subleading-power corrections to a certain extent, and our numerical results are consistent with those of previous studies on sum rules. A comparison between our results and existing model-dependent estimations is also made.
  • One-pion-exchange potential with contact terms from lattice QCD simulations
    Jinniu Hu, Ying Zhang, Hong Shen, Hiroshi Toki
    Published: 2020-05-18, doi: 10.1088/1674-1137/44/7/071002
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    Pion-mass-dependent nucleon-nucleon (NN) potentials are obtained in terms of the one-pion exchange and contact terms from the latest lattice QCD simulations of the two-nucleon system. They assume the forms of the leading order (LO) NN potential from the chiral effective field theory and thus are referred to as the LO chiral potential in this study. We extract the coefficients of contact terms and cut-off momenta in these potentials, for the first time, by fitting the phase shifts of $^1S_0$ and $^3S_1$ channels obtained from the HALQCD collaboration with various pion masses from 468.6 to 1170.9 MeV. The low-energy constants in the $^1S_0$ and $^3S_1$ channels become weaker and approach each other for larger pion masses. These LO chiral potentials are applied to symmetric nuclear and pure neutron matter within the Brueckner-Hartree-Fock method. Presently, however, we do not yet have the information of the P-wave NN interaction to be provided by the lattice QCD simulations for a complete description of nuclear matter. Our results enhance understanding of the development of nuclear structure and nuclear matter by controlling the contribution of the pionic effect and elucidate the role of chiral symmetry of the strong interaction in complex systems.
  • Chiral magnetic effect for chiral fermion system
    Ren-Da Dong, Ren-Hong Fang, De-Fu Hou, Duan She
    Published: 2020-05-12, doi: 10.1088/1674-1137/44/7/074106
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    The chiral magnetic effect is concisely derived by employing the Wigner function approach in the chiral fermion system. Subsequently, the chiral magnetic effect is derived by solving the Landau levels of chiral fermions in detail. The second quantization and ensemble average leads to the equation of the chiral magnetic effect for righthand and lefthand fermion systems. The chiral magnetic effect arises uniquely from the contribution of the lowest Landau level. We carefully analyze the lowest Landau level and find that all righthand (chirality is +1) fermions move along the direction of the magnetic field, whereas all lefthand (chirality is −1) fermions move in the opposite direction of the magnetic field. Hence, the chiral magnetic effect can be explained clearly using a microscopic approach.
Current Issued
Chinese Physics C
2020 Vol. 44, No. 5
Published:
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Chinese Physics C
IF: 5.861

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