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arXiv 1003.1098nucl-thhep-phnucl-ex
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$γd\to K^{+}K^{-}np$反应的研究和“$Θ^{+}(1540)$五夸克态”峰的另一种解释

Study of the $γd\to K^{+}K^{-}np$ reaction and an alternative explanation for the "$Θ^{+}(1540)$ pentaquark" peak

A. Martínez Torres, E. Oset

摘要:

我们提出了一个计算的$γd \to K^+ K^- n p $反应的目的,看看是否实验峰观察到的$K^+ n$不变质量约1526兆电子伏,从那里的证据存在的$Θ^+$已被要求,可以得到没有这种共振作为一个结果的过程中的特定动力学和削减应用的实验设置。我们发现,事实的组合确实导致一个峰值约1530兆电子伏的不变质量的$K^+ n$,而不需要调用任何新的共振围绕这个能量。这一点,再加上我们用实验的统计数据证明是很大的统计波动,很可能产生那里观察到的较窄的峰。

英文摘要:

We present a calculation of the $γd \to K^+ K^- n p $ reaction with the aim of seeing if the experimental peak observed in the $K^+ n$ invariant mass around 1526 MeV, from where evidence for the existence of the $Θ^+$ has been claimed, can be obtained without this resonance as a consequence of the particular dynamics of the process and the cuts applied in the experimental set up. We find that a combination of facts leads indeed to a peak around 1530 MeV for the invariant mass of $K^+ n$ without the need to invoke any new resonance around this energy. This, together with statistical fluctuations that we prove to be large with the statistics of the experiment, is likely to produce the narrower peak observed there.

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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