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arXiv 1702.08645hep-phhep-ex
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具有$N^*$和$t$-通道Regge贡献的$Λ(1405)$的光产生

Photoproduction of $Λ(1405)$ with the $N^*$ and $t$-channel Regge contributions

Sang-Ho Kim, Seung-il Nam, Daisuke Jido, Hyun-Chul Kim

摘要:

我们研究了光生$Λ(1405)\equivΛ^*$超子共振,即,$γp\to K^+Λ^*$,采用有效的拉格朗日方法与$t$通道Regge轨迹在树的水平。我们广泛地探讨了在阈值$\sqrt{s}_\mathrm{th}\approx1900$ MeV附近核子共振的影响,即,$N(2000)$、$N(2030)$、$N(2055)$、$N(2095)$和$N(2100)$,并观察到它们对于再现最近的CLAS/Jlab实验数据非常重要。总截面和微分截面作为数值结果给出,并与实验数据进行比较,除了$t$通道动量转移和光子束不对称性。通过$Λ^*$的$γp\to K^+π^0Σ^0$的不变质量图也从两体过程结果中提取,显示与数据的定性一致。我们还讨论了$Λ^*$的内部结构的成分计数规则,导致$Λ^*$似乎是从一个简单的三夸克$(uds)$状态不同。

英文摘要:

We investigate the photoproduction of $Λ(1405)\equivΛ^*$ hyperon resonance, i.e., $γp\to K^+Λ^*$, employing the effective Lagrangian approach with the $t$-channel Regge trajectories at tree level. We extensively explore the effects from the nucleon resonances in the vicinity of the threshold $\sqrt{s}_\mathrm{th}\approx1900$ MeV, i.e., $N(2000)$, $N(2030)$, $N(2055)$, $N(2095)$, and $N(2100)$, and observe that they are of great importance to reproduce the recent CLAS/Jlab experimental data. Total and differential cross sections are given as numerical results and compared with the experimental data, in addition to the $t$-channel momentum transfer and photon-beam asymmetry. The invariant-mass plots for $γp\to K^+π^0Σ^0$ via $Λ^*$ are also extracted from the two-body process results, showing a qualitative agreement with the data. We also discuss the constituent-counting rule for the internal structure of $Λ^*$, resulting in that $Λ^*$ appears to be different from a simple three-quark $(uds)$ state.

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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