论文标题
$γn\ to K^+σ^ - $ photoduction中的核子和$δ$共振
Nucleon and $Δ$ resonances in $γn \to K^+Σ^-$ photoproduction
论文作者
论文摘要
最新的有关Beam不对称，$σ$的数据以及来自CLAS协作的$ e $的束目标不对称的数据，以及先前关于差异横截面和LEPS合作的差异数据的数据，以基于$γn\ for k^+σ^ - $反应的$γn\ for the lagr lagrangian方法。 $ t $ -CHANNEL $ K $和$ k^\ ast（892）$交换，$ u $ -Channel $σ$交换，交互电流以及$ n $，$δ$的交流以及它们在$ S $频道中的激发态在构建可用的实验性数据的反应时都被认为是在构建反应时。分析了$γn\至k^+σ^ - $的反应机理，并提取了相关的共振参数。数值结果表明，$δ$交换和$ n（1710）1/2^+$，$ n（1880）1/2^+$，$ n（1900）3/2^+$，以及$δ（1920）3/2^+$ $ $ s $ s $ channel possion $ s $ poction $γn\ the $γ^^them-k^^them-k^^$ quy-k^^ - $ k^\ ast（892）$交易所在较高能源区域的正角中起着至关重要的作用。
The most recent data on beam asymmetries, $Σ$, and beam-target asymmetries, $E$, from the CLAS Collaboration, together with the previous data on differential cross sections and beam asymmetries from the CLAS and LEPS Collaborations, for the $γn \to K^+Σ^-$ reaction are studied based on an effective Lagrangian approach in the tree-level Born approximation. The $t$-channel $K$ and $K^\ast(892)$ exchanges, the $u$-channel $Σ$ exchange, the interaction current, and the exchanges of $N$, $Δ$, and their excited states in the $s$ channel are considered in constructing the reaction amplitudes to describe the available experimental data. The reaction mechanisms of $γn \to K^+Σ^-$ are analyzed, and the associated resonances' parameters are extracted. The numerical results show that the $Δ$ exchange and the $N(1710)1/2^+$, $N(1880)1/2^+$, $N(1900)3/2^+$, and $Δ(1920)3/2^+$ resonance exchanges in the $s$-channel dominate the $γn \to K^+Σ^-$ reaction in the lower energy region, and the $t$-channel $K^\ast(892)$ exchange plays a crucial role at forward angles in the higher energy region.
