磁化同位旋非对称核物质中D介子和D*介子的介质性质
In-medium properties of $D$ and $D^*$ mesons in magnetized isospin asymmetric nuclear matter
AI总结：
本研究采用CQMF与LFQM混合框架，探究磁化同位旋非对称核物质中，外磁场、重子密度等因素对D及D*介子介质性质的影响，相关结果对重味动力学研究有重要意义。
AI中文摘要：
我们采用手征SU(3)夸克平均场（CQMF）模型与光前夸克模型（LFQM）结合的混合理论框架，研究有限温度下，外磁场对同位旋非对称核物质中赝标量介子（D⁰、D⁺、Dₛ）和矢量介子（D⁰*、D⁺*、Dₛ*）介质性质的影响。由CQMF模型纳入磁化狄拉克海贡献和核子反常磁矩得到的介质修正组分夸克质量，被用作LFQM计算介子质量、弱衰变常数和领头扭度分布振幅的输入。我们进一步计入带电介子的朗道量子化（限定在最低朗道能级），同时对每组D-D*双重态考虑磁场诱导的赝标量-矢量混合。研究发现，外磁场通过磁催化作用增强赝标量和矢量D介子的有效质量与衰变常数；增加重子密度通常会产生吸引型质量移动，并抑制衰变常数和分布振幅。朗道能级贡献进一步提高带电介子的有效质量，而赝标量-矢量混合产生能级排斥，使矢量介子质量上移、赝标量介子质量下移。磁场与密度效应的相互作用导致重味介子性质呈现非平凡的介质行为，同位旋不对称性还会在所有考虑的介子态中产生微小但系统的质量分裂。这些结果为强相互作用物质中的重味动力学提供了有用的见解，与FAIR、NICA和J-PARC正在进行及未来的研究相关。
英文摘要：
We investigate the impact of an external magnetic field on the in-medium properties of pseudoscalar ($D^0,D^+,D_s$) and vector ($D^{0*},D^{+*},D_{s}^{*}$) mesons in isospin asymmetric nuclear matter at finite temperature using a hybrid theoretical framework combining the chiral SU(3) quark mean-field (CQMF) model and the light-front quark model (LFQM). The medium-modified constituent quark masses, obtained from the CQMF model by including the magnetized Dirac sea contribution and anomalous magnetic moments of nucleons, are used as input to the LFQM calculations of meson masses, weak decay constants, and leading-twist distribution amplitudes. We further incorporate the Landau quantization of the charged mesons restricted to the lowest Landau level, while magnetic field induced pseudoscalar-vector mixing is taken into account for each $D$-$D^{*}$ doublet. We find that the external magnetic field enhances the effective masses and decay constants of both pseudoscalar and vector $D$ mesons by magnetic catalysis, while increasing baryon density generally induces an attractive mass shift and suppresses the decay constant and distribution amplitudes. The Landau level contribution further enhances the effective masses of the charged mesons, whereas the pseudoscalar-vector mixing produces a level repulsion, shifting the vector meson masses upward and the pseudoscalar meson masses downward. The interplay between magnetic field and density effects gives rise to a nontrivial medium behavior of heavy-light meson properties, with isospin asymmetry further inducing a small but systematic mass splitting across all the meson states considered. These results provide useful insights into heavy-flavor dynamics in strongly interacting matter and are relevant to ongoing and future studies at FAIR, NICA, and J-PARC.
