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What can be learned from the Belle spectrum for the decay tau() > nu(t)K(S)pi()
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Jamin, Matthias; Pich Zardoya, Antonio; Portolés Ibáñez, Jorge


This document is a artículoDate2008




A theoretical description of the differential decay spectrum for the decay tau() > nu(tau)K(S)pi(), which is based on the contributing K pi vector and scalar form factors F(+)(K pi)(s) and F(0)(K pi)(s) being calculated in the framework of resonance chiral theory (R chi T), additionally imposing constraints from dispersion relations as well as short distance QCD, provides a good representation of a recent measurement of the spectrum by the Belle Collaboration. Our fit allows to deduce the total branching fraction B[tau() > v(tau)K(S)pi()] = 0.427 +/ 0.024% by integrating the spectrum, as well as the K* resonance parameters M(K)* = 895.3 +/ 0.2 MeV and Gamma(K)* = 47.5 +/ 0.4 MeV, where the last two errors are statistical only. From our fits, we confirm that the scalar form factor F(0)(K pi)(S) is required to provide a good description, but we were unable to further constrain this contribution. Finally, from our results for the vector form factor F(+)(K pi) (S), we update the corresponding slope and curvature parameters lambda(+)' = (25.2 +/ 0.3) x 10(3) and lambda(+)'' = (12.9 +/ 0.3) x 10(4), respectively.


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