Rate measurement of D(0)-->K+pi(-)pi(0) and constraints on D(0) -- D(0) mixing.

G Brandenburg,A Ershov,D Y Kim,R Wilson,T Bergfeld,B I Eisenstein,J Ernst,G E Gladding,G D Gollin,R M Hans,E Johnson,I Karliner,M A Marsh,C Plager,C Sedlack,M Selen,J J Thaler,J Williams,K W Edwards,A J Sadoff,R Ammar,A Bean,D Besson,X Zhao,S Anderson,V V Frolov,Y Kubota,S J Lee,R Poling,A Smith,C J Stepaniak,J Urheim,S Ahmed,M S Alam,S B Athar,L Jian,L Ling,M Saleem,S Timm,F Wappler,A Anastassov,E Eckhart,K K Gan,C Gwon,T Hart,K Honscheid,D Hufnagel,H Kagan,R Kass,T K Pedlar,J B Thayer,E von Toerne,M M Zoeller,S J Richichi,H Severini, P Skubic,A Undrus,V Savinov,S Chen,J W Hinson,J Lee,D H Miller,E I Shibata,I P Shipsey,V Pavlunin,D Cronin-Hennessy,A L Lyon,E H Thorndike,T E Coan,V Fadeyev,Y S Gao,Y Maravin,I Narsky,R Stroynowski,J Ye,T Wlodek,M Artuso,K Benslama,C Boulahouache,K Bukin,E Dambasuren,G Majumder,R Mountain,T Skwarnicki,S Stone,J C Wang,A Wolf,S Kopp,M Kostin,A H Mahmood,S E Csorna,I Danko,K W McLean,Z Xu,R Godang,G Bonvicini,D Cinabro,M Dubrovin,S McGee,G J Zhou,A Bornheim,E Lipeles,S P Pappas,A Shapiro,W M Sun,A J Weinstein,D E Jaffe,R Mahapatra,G Masek,H P Paar,D M Asner,A Eppich,T S Hill,R J Morrison,H N Nelson,R A Briere,G P Chen,T Ferguson,H Vogel,J P Alexander,C Bebek,B E Berger,K Berkelman,F Blanc,V Boisvert,D G Cassel,P S Drell,J E Duboscq,K M Ecklund,R Ehrlich,P Gaidarev,L Gibbons,B Gittelman,S W Gray,D L Hartill,B K Heltsley,L Hsu,C D Jones,J Kandaswamy,D L Kreinick,M Lohner,A Magerkurth,T O Meyer,N B Mistry,E Nordberg,M Palmer,J R Patterson,D Peterson,D Riley,A Romano,H Schwarthoff,J G Thayer,D Urner,B Valant-Spaight,G Viehhauser,A Warburton,P Avery,C Prescott,A I Rubiera,H Stoeck,J Yelton,

Physical review letters（2001）

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摘要

We present an observation and time-integrated rate measurement of the decay D(0)-->K(+)pi(-)pi(0) produced in 9 fb(-1) of e(+)e(-) collisions near the Upsilon(4S) resonance. The signal is inconsistent with an upward fluctuation of the background by 4.9 standard deviations. We measured the time-integrated rate of D(0)-->K(+)pi(-)pi(0) normalized to the rate of D(0)-->K(+)pi(-)pi(0) to be 0.0043(+0.0011)(-0.0010) (stat)+/-0.0007 (syst). This decay can be produced by doubly Cabibbo-suppressed decays or by the D(0) evolving into a D(0) through mixing, followed by a Cabibbo-favored decay to K(+)pi(-)pi(0). We also found the CP asymmetry A = (9(+25)(-22))% be consistent with zero.

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