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arXiv 1505.04571hep-phhep-exnucl-exnucl-th
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观测到的$ψ(3770)\to p\bar{p}π^0$对研究$p\bar{p}\to ψ(3770)π^0$过程的启示

Implication of the observed $ψ(3770)\to p\bar{p}π^0$ for studying the $p\bar{p}\to ψ(3770)π^0$ process

Lanzhou University(兰州大学);Institute of Modern Physics, Chinese Academy of Sciences(中国科学院近代物理研究所);School of Physical Science and Technology, Lanzhou University(兰州大学物理科学与技术学院);Institute of Theoretical Physics, Chinese Academy of Sciences(中国科学院理论物理研究所)

Hao Xu, Ju-Jun Xie, Xiang Liu

AI总结:

本研究采用有效拉格朗日方法,利用e⁺e⁻→p̄pπ⁰实验数据确定参数,预测p̄p→ψ(3770)π⁰等反应的截面,发现核子极点贡献主导但干涉效应显著影响角分布,结果可由未来PANDA实验检验。

摘要:

我们采用有效拉格朗日方法研究粲偶素$p \bar{p} \to ψ(3770) π^0$反应,其中考虑了已确立的$N^*$态的贡献,所有参数均通过质心系能量$\sqrt{s} = 3.773$ GeV下的$e^+e^- \to p \bar{p}π^0$过程确定。$e^+e^- \to p\bar{p}π^0$的质量分布线形实验数据可被很好地重现。基于对$e^+e^- \to p \bar{p}π^0$的研究,我们预测了$p \bar{p} \to ψ(3770) π^0$反应的总截面和微分截面。同时我们也计算了$p \bar{p} \to ψ(3686) π^0$反应的截面。结果表明,在从反应阈值开始的较宽范围内,核子极点对该反应的贡献最大。然而,核子极点与其他核子共振之间的干涉仍可显著改变角分布。这些理论结果可通过未来的$\overline{\mbox{P}}$ANDA实验进行检验。

英文摘要:

We study the charmonium $p \bar{p} \to ψ(3770) π^0$ reaction using the effective lagrangian approach where the contributions from well established $N^*$ states are considered, and all parameters are fixed in the process of $e^+e^- \to p \bar{p}π^0$ at center of mass energy $\sqrt{s} = 3.773$ GeV. The experimental data on the line shape of the mass distribution of the $e^+e^- \to p\bar{p}π^0$ can be well reproduced. Based on the studying of $e^+e^- \to p \bar{p}π^0$, the total and differential cross sections of the $p \bar{p} \to ψ(3770) π^0$ reaction are predicted. At the same time we evaluated also the cross sections of the $p \bar{p} \to ψ(3686) π^0$ reaction. It is shown that the contribution of the nucleon pole to this reaction is largest from the reaction threshold within a wide range. However, the interference between nucleon pole and the other nucleon resonance can still change the angle distributions significantly. Those theoretical results may be test by the future experiments at $\overline{\mbox{P}}$ANDA.

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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