Journal article

Observation of the Doubly Cabibbo-Suppressed Decay D-s( )-> K K pi(-)

BR Ko, E Won, H Aihara, K Arinstein, T Aushev, AM Bakich, V Balagura, E Barberio, A Bondar, A Bozek, M Bracko, J Brodzicka, TE Browder, A Chen, BG Cheon, I-S Cho, Y Choi, A Drutskoy, W Dungel, S Eidelman Show all

Physical Review Letters | AMER PHYSICAL SOC | Published : 2009


We report the first observation of the doubly Cabibbo-suppressed decay D_{s};{+}-->K;{+}K;{+}pi;{-} using 605 fb;{-1} of data collected with the Belle detector at the KEKB asymmetric-energy e;{+}e;{-} collider. The branching ratio with respect to its Cabibbo-favored counterpart B(D_{s};{+}-->K;{+}K;{+}pi;{-})/B(D_{s};{+}-->K;{+}K;{-}pi;{+}) is (0.229+/-0.028+/-0.012)%, where the first uncertainty is statistical and the second is systematic. We also report a significantly improved measurement of the doubly Cabibbo-suppressed decay D;{+}-->K;{+}pi;{+}pi;{-}, with a branching ratio B(D;{+}-->K;{+}pi;{+}pi;{-})/B(D;{+}-->K;{-}pi;{+}pi;{+})=(0.569+/-0.018+/-0.014)%.


Funding Acknowledgements

We thank the KEKB group for operation of the accelerator, the KEK cryogenics group for solenoid operations, and the KEK computer group and the NII for valuable computing and SINET3 network support. We acknowledge support from MEXT, JSPS, and Nagoya's TLPRC (Japan); ARC and DIISR (Australia); NSFC (China); DST (India); MOEHRD and KOSEF (Korea); MNiSW (Poland); MES and RFAAE (Russia); ARRS (Slovenia); SNSF (Switzerland); NSC and MOE (Taiwan); and DOE (U.S.A.).