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arXiv 1509.04786hep-phhep-exnucl-exnucl-th
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有效拉格朗日模型中${\bar p}p$湮灭为${\bar D}D$介子对

${\bar p}p$ annihilation into ${\bar D}D$ meson pair within an effective Lagrangian model

R. Shyam, H. Lenske

摘要:

本文在只包含重子-介子自由度和强子质量的有效拉格朗日模型下研究了${\bar p}p$湮灭过程中粲介子对(${\bar D}^0 D^0$和$D^- D^+$)的产生.反应振幅包括对应于t通道$Λ_c^+$、$Σ_c^+$和$Σ_c^{++}$重子交换以及$Ψ$(3770)共振进入粲介子的s通道激发、传播和衰变的项。的初始和最终状态的失真效应已占通过使用一个简单的程函近似为基础的程序,以同样的方式在我们以前的研究中所做的${\bar p}p \to {\bar Λ}_c^-Λ_c^+$反应在一个类似的模型。${\bar D}^0 D^0$的产生反应主要由$Λ_c^+$重子交换过程控制,当反质子束动量在阈值和20 $GeV/c$之间变化时,相应的总截面在0.18 - 0.7 $μ$ b之间. $Ψ$(3770)共振贡献对$D^- D^+$生成反应的微分截面有很大影响。

英文摘要:

We study the charmed meson pair (${\bar D}^0 D^0$ and $D^- D^+$) production in ${\bar p}p$ annihilation within an effective Lagrangian model that has only the baryon-meson degrees of freedom and involves the physical hadron masses. The reaction amplitudes include terms corresponding to the t-channel $Λ_c^+$, $Σ_c^+$ and $Σ_c^{++}$ baryon exchanges and the s-channel excitation, propagation and decay of the $Ψ$(3770) resonance into the charmed mesons. The initial- and final-state distortion effects have been accounted for by using a simple eikonal approximation-based procedure in the same way as was done in our previous study of the ${\bar p}p \to {\bar Λ}_c^-Λ_c^+$ reaction within a similar model. The ${\bar D}^0 D^0$ production reaction is dominated by the $Λ_c^+$ baryon exchange process, and the corresponding total cross sections are predicted to be in the range of 0.18 - 0.7 $μ$b for antiproton beam momenta varying between threshold and 20 $GeV/c$. The $Ψ$(3770) resonance contributions have a large influence on the differential cross sections of the $D^- D^+$ production reaction.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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