Abstract
The three body decays [Formula: see text], may be used to measure both sin 2β and cos 2β. Crucial to the cos 2β measurement is the resonant contribution to the three body decay from p-wave excited Ds, states. If these p-wave states are the newly discovered Ds(2317) and Ds(2460) then they are below the D(*)K threshold and hence do not contribute to [Formula: see text]. The three body decays can then be used to measure sin 2β without resonant dilution and to look for new physics in [Formula: see text] transition.
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