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首页> 外文期刊>Physical review, C >Combined analysis of the pi(-) p -> K-0 Lambda, eta n reactions in a chiral quark model
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Combined analysis of the pi(-) p -> K-0 Lambda, eta n reactions in a chiral quark model

机译：pi（ - ）p - > k-0 lambda，手性夸克模型中的ETA n反应的组合分析

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A combined analysis of the reactions pi(-) p -> K-0 Lambda and eta n is carried out with a chiral quark model. The data in the center-of-mass (c.m.) energy range from threshold up to W similar or equal to 1.8 GeV are reasonably described. For pi(-) p -> K-0 Lambda, it is found that N(1535)S-11 and N(1650) S11 play crucial roles near threshold. The N(1650) S-11 resonance contributes to the reaction through configuration mixing with N(1535)S-11. The constructive interference between N(1535) S11 and N(1650) S11 is responsible for the peak structure around threshold in the total cross section. The n-pole, u-, and t-channel backgrounds provide significant contributions to the reaction as well. For the pi(-) p -> eta n process, the "first peak" in the total cross section is dominated by N(1535)S-11, which has a sizeable destructive interference with N(1650)S-11. Around P-pi similar or equal to 1.0 GeV/c (W similar or equal to 1.7 GeV), there seems to be a small bump structure in the total cross section, which might be explained by the interference between the u channel and N(1650)S-11. The N(1520)D-13 resonance affects the angle distributions of the cross sections notably, although no obvious effects are seen in the total cross section. The role of P-wave state N(1720)P-13 should be further confirmed by future experiments. If N(1720) P13 has a narrow width of Gamma similar or equal to 120 MeV as found in our previous work by a study of the pi(0) photoproduction processes, obvious evidence should be seen in the pi(-) p -> K-0 Lambda and eta n processes as well. Finally, we give our predictions of the s-channel isospin-1/2 resonance contributions to the pi N -> pi N reactions.
机译：用手性夸克模型进行反应PI（ - - ）p - > K-0λ和η1的组合分析。可合理地描述了与阈值相似或等于1.8 gev的阈值的质量中心（C.）能量范围。对于pi（ - ）p - > k-0 lambda，发现n（1535）S-11和n（1650）S11在阈值附近发挥关键作用。 N（1650）S-11共振通过与N（1535）S-11混合有助于反应。 N（1535）S11和N（1650）S11之间的建设性干扰负责总横截面中的周围阈值的峰值结构。 N极，U-和T沟道背景也为反应提供了显着的贡献。对于PI（ - ）P - > ETA工艺，总横截面中的“第一峰”由N（1535）S-11主导，其具有可大量的破坏性干扰N（1650）S-11。 P-PI周围类似或等于1.0 GEV / C（类似或等于1.7 GEV），总横截面似乎是一个小的凸块结构，这可能通过U通道和N之间的干扰来解释（ 1650）S-11。 N（1520）D-13谐振显着影响横截面的角度分布，尽管在总横截面中没有看到明显效果。应该通过未来的实验进一步证实p波态N（1720）P-13的作用。如果n（1720）p13具有相似或等于120 mev的较窄宽度，如我们以前的工作中发现的pi（0）光生产过程中的研究，则在PI（ - ）p - >中应该看到明显的证据K-0 Lambda和ETA N进程也是如此。最后，我们向PI N - > Pi N反应提供了对S渠道isospin-1/2共振贡献的预测。

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