Constraining the Kπ vector form factor by τ→Kπν_τ and K_l3 decay data

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• 作者：Diogo R. Boito ; Rafel Escribano ; Matthias Jamin
• 关键词：τ ; decays ; Kaon decays ; dispersion relations
• 刊名：Nuclear Physics B - Proceedings Supplements
• 出版年：2010
• 出版时间：October-November 2010
• 年：2010
• 卷：207-208
• 期：Complete
• 页码：148-151
• 全文大小：177 K

文摘

A subtracted dispersive representation of the Kπ vector form factor, , is used to fit the Belle spectrum of τ→Kπν_τ decays incorporating constraints from results on K_l3 decays. Through the use of three subtractions, the slope and curvature of are obtained directly from the data yielding and . The phase-space integrals relevant for K_l3 analyses are calculated. Additionally, from the pole position on the second Riemann sheet the mass and width of the K(892)^± are found to be and . Finally, we study the P-wave isospin-1/2 Kπ phase-shift and its threshold parameters.