论文标题
奇怪的媒介介子在不对称超声质物质中的光谱函数
Spectral functions of strange vector mesons in asymmetric hyperonic matter
论文作者
论文摘要
我们研究了光谱函数的中等修改以及奇怪的媒介媒介（$ ϕ $，$ k^*$和$ \ bar {k^*} $）的生产横截面。这些是从开放式奇怪的介子的中等质量中获得的，衰减宽度$ ϕ \ rightarrow k \ bar k $，$ k^* \ rightarrowkπ$和$ \ bar {k^*} \ rightarrow {\ bar k}π$在Hadronic介质中。衰减宽度是使用带有夸克/古夸克成分的复合载体的场理论模型，该模型是从初始状态和最终状态之间的Free Dirac Hamiltonian的Light Quark-Antiquark Pair creation创建项的矩阵元素中计算出来的。矩阵元件乘以光夸克 - 易夸克对创建的耦合强度参数，该参数拟合到衰减过程的观察到的真空衰减宽度。观察到，由于异种不对称性以及高密度下的Hadroonic Medum的陌生性，这些矢量介体的光谱函数以及这些载体介体的生产横截面进行了实质性修饰。这些研究应具有可见的后果，例如在GSI的未来设施中，在压缩的重磅质量（CBM）实验中，由等素不对称的高能重离子碰撞引起的隐藏和开放式奇怪的介子的产量。
We study the medium modifications of the spectral functions as well as production cross-sections of the strange vector mesons ($ϕ$, $K^*$ and $\bar {K^*}$) in isospin asymmetric strange hadronic matter. These are obtained from the in-medium masses of the open strange mesons and the decay widths $ϕ\rightarrow K\bar K$, $K^* \rightarrow Kπ$ and $\bar {K^*} \rightarrow {\bar K}π$ in the hadronic medium. The decay widths are computed using a field theoretic model of composite hadrons with quark/antiquark constituents, from the matrix element of the light quark-antiquark pair creation term of the free Dirac Hamiltonian between the initial and final states. The matrix element is multiplied with a coupling strength parameter for the light quark-antiquark pair creation, which is fitted to the observed vacuum decay width of the decay process. There are observed to be substantial modifications of the spectral functions as well as production cross-sections of these vector mesons due to isospin asymmetry as well as strangeness of the hadronic medum at high densities. These studies should have observable consequences, e.g. in the yield of the hidden and open strange mesons arising from the isospin asymmetric high energy heavy ion collisions at the Compressed baryonic matter (CBM) experiments at the future facility at GSI.
