K. Abe, for the Belle Collaboration
Published 2005-07-14Version 1
We present a preliminary measurement of the angle phi1 of the CKM Unitarity Triangle using time-dependent analysis of D -> Ks pi+ pi- decays produced in neutral B meson decay to a neutral D meson and a light meson (B -> D h). The method allows one to directly extract the value of 2phi1. The ambiguity between 2phi1 and pi-2phi1 in the measurement of sin(2phi1) can then be resolved. We obtain phi1=16 +- 21 +- 11. The 95% CL region including systematic error is -30<phi1<62, thus ruling out the second solution from sin(2phi1)=0.726 +- 0.037 at the 97% CL.
Comments: 12 pages, 7 figures, submitted to the Lepton Photon 2005 conference in Uppsala, Sweden and to the HEP2005 Europhysics Conference in Lisbon, Portugal
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