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arXiv 1508.04882nucl-thhep-ph
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Lambda_c^+的弱衰变用于Lambda(1405)和Lambda(1670)的研究

Weak decay of Lambda_c^+ for the study of Lambda(1405) and Lambda(1670)

Kenta Miyahara, Tetsuo Hyodo, Eulogio Oset

摘要:

我们研究了π ^+和介子-重子末态的Lambda_c衰变过程,分析了Lambda共振。考虑Cabibbo-Kobayashi-Maskawa矩阵、色抑制、双夸克关联和运动学条件,我们证明了当介子-重子不变质量较小时,最终的介子-重子态应该是纯I=0的组合.由于I=1的污染通常使直接从实验中分析λ共振变得困难,因此λ c衰变是研究λ共振的理想过程。用手征幺正方法计算末态相互作用,发现π Σ不变质量分布在π Σ态的全部电荷组合中具有相同的峰结构,且与λ(1405)的两极中的高极有关.此外,在KbarN和etaLambda谱中还得到了清晰的Lambda(1670)峰结构.

英文摘要:

We study the Lambda_c decay process to pi^+ and the meson-baryon final state for the analysis of Lambda resonances. Considering the Cabibbo-Kobayashi-Maskawa matrix, color suppression, diquark correlation and the kinematical condition, we show that the final meson-baryon state should be in a pure I=0 combination, when the meson-baryon invariant mass is small. Because the I=1 contamination usually makes it difficult to analyze Lambda resonances directly from experiments, the Lambda_c decay is an ideal process to study Lambda resonances. Calculating the final state interaction by chiral unitary approaches, we find that the piSigma invariant mass distributions have the same peak structure in the all charge combination of the piSigma states related to the higher pole of the two poles of the Lambda(1405). Furthermore, we obtain a clear the Lambda(1670) peak structure in the KbarN and etaLambda spectra.

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