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Role of the N*(1535) resonance and the pi(-)p -> KY amplitudes in the OZI forbidden pi N ->phi N reaction

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Role of the N*(1535) resonance and the pi(-)p -> KY amplitudes in the OZI forbidden pi N ->phi N reaction

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Döring, Michael; Oset Báguena, Eulogio; Zou, B. S.

Aquest document és un/a article, creat/da en: 2008

We study the pi N --> phi N reaction close to the phi N threshold within the chiral unitary approach, by combining the pi^- p --> K^+ Sigma^-, pi^- p --> K^0 Sigma^0 and pi^- p --> K^0 Lambda amplitudes with the coupling of the phi to the K components of the final states of these reactions via quantum loops. We obtain a good agreement with experiment when the dominant pi^- p --> K^0 Lambda amplitude is constrained with its experimental cross section. We also evaluate the coupling of the N*(1535) to phi N and find a moderate coupling as a consequence of partial cancellation of the large KY components of the N*(1535). We also show that the N*(1535) pole approximation is too small to reproduce the measured cross section for the pi N --> phi N reaction.

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