Title

Resonance structure of τ-→Κ-π+π -ντ decays

Document Type

Article

Publication Date

10-1-2000

Abstract

Using a sample of 4.7 fb integrated luminosity accumulated with the CLEO II detector at the Cornell Electron Storage Ring (CESR), we investigate the mass spectrum and resonant structure in τ →Κ π π ν decays. We measure the relative fractions of Κ (1270) and Κ (1400) resonances in these decays, as well as the Κ masses and widths. Our fitted Κ resonances are somewhat broader than previous hadroproduction measurements, and in agreement with recent CERN LEP results from tau decay. The larger central value of our measured width supports models which attribute the small τ →Κ π π ν branching fraction to larger Κ widths than are presently tabulated. We also determine the Κ -Κ mixing angle θ . ©2000 The American Physical Society. -1 - - + - - - + - τ 1 1 1 1 τ 1 a b Κ

Publication Name

Physical Review D - Particles, Fields, Gravitation and Cosmology

Volume Number

62

First Page

1

Last Page

11

Issue Number

7

Article

072006

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