Abstract
Using and interactions at 4170 MeV collected with the CLEO-c detector, we investigate the semileptonic decays and . By examining the decay rates as functions of the four-momentum transfer squared , we measure the ratio at of zero to be . This ratio has been predicted to equal the rate ratio , thus indicating that the eigenstate could be useful for measuring violation via mixing. Assuming a simple pole model for the form factor in the decay, we find a pole mass of . We also determine the mass and width as and , respectively. In addition, we present updated results for and . Assuming that the wave function is a combination of strange and nonstrange quark-antiquark components, we use our measurement for to extract a value of the mixing angle that we find consistent with dominance, adding to the mystery as to why the decays predominantly to two pions rather than two kaons.
2 More- Received 18 July 2009
DOI:https://doi.org/10.1103/PhysRevD.80.052009
©2009 American Physical Society