论文标题
中等内部分散关系和$nπ\ leftrightarrowδ$的介质校正靠近茶的阈值产生的阈值
In-medium pion dispersion relation and medium correction of $Nπ\leftrightarrow Δ$ near the threshold energy of pion production
论文作者
论文摘要
传输模型不能同时解释在0.27 A GEV中反应中SN+SN的暂停多数的最新数据和PION带电的比率。这刺激了对裂期分散关系的进一步研究，$nπ\至δ$横截面以及$δ\ $δ\ tonπ$衰减宽度附近的阈值能量或在等异种中的pion产生的亚阈值能量中。在这项研究中，通过使用单验证模型研究了阈值的中等内部$nπ\至δ$横截面中的中等$nπ\至δ$横截面，$δ\ to $δ\ to $δ\ tonπ$衰减宽度。考虑到能量守恒效应，在$ s^{1/2} <1.11 $ GEV的核培养基中，中等内的$nπ\toδ$横截面在核培养基处得到增强。如果在传输模型模拟中考虑这种效果，则可以修改Pion多样性的预测和$π^ - /π^+$比率。
Transport models cannot simultaneously explain very recent data on pion multiplicities and pion charged ratios of Sn+Sn in the reaction at 0.27 A GeV. This stimulates further investigations on the pion dispersion relation, in-medium $Nπ\to Δ$ cross sections and $Δ\to N π$ decay widths near the threshold energy or at subthreshold energy of pion production in isospin asymmetric nuclear matter. In this study, the pion dispersion relation, in-medium $Nπ\to Δ$ cross section and $Δ\to N π$ decay width near the threshold energy are investigated in isospin asymmetric nuclear matter by using the one-boson-exchange model. With the consideration of the energy conservation effect, the in-medium $Nπ\toΔ$ cross sections are enhanced at $s^{1/2}<1.11$ GeV in nuclear medium. The prediction of pion multiplicity and $π^-/π^+$ ratios near the threshold energy can be modified if this effect is considered in transport model simulations.
