Comparison Of D -> K(S)(0)Pi And D -> K(L)(0)Pi Decay Rates

Q. He,J. Insler,H. Muramatsu,C. S. Park,E. H. Thorndike, F. Yang,T. E. Coan,Y. S. Gao,M. Artuso,S. Blusk,J. Butt,J. Li,N. Menaa,R. Mountain,S. Nisar,K. Randrianarivony,R. Sia,T. Skwarnicki,S. Stone,J. Wang,K. Zhang,G. Bonvicini,D. Cinabro,M. Dubrovin,A. Lincoln,D. M. Asner,K. W. Edwards,R. A. Briere,T. Ferguson,G. Tatishvili,H. Vogel,M. E. Watkins,J. L. Rosner,N. E. Adam,J. P. Alexander,D. G. Cassel,J. E. Duboscq,R. Ehrlich,L. Fields,L. Gibbons,R. Gray,S. W. Gray,D. L. Hartill,B. K. Heltsley,D. Hertz,C. D. Jones,J. Kandaswamy,D. L. Kreinick,V. E. Kuznetsov,H. Mahlke-Krüger,P. U E Onyisi,J. R. Patterson,D. Peterson,J. Pivarski,D. Riley,A. Ryd,A. J. Sadoff,H. Schwarthoff,X. Shi,S. Stroiney,W. Sun,T. Wilksen,M. Weinberger,S. B. Athar,R. Patel,V. Potlia,J. Yelton,P. Rubin,C. Cawlfield,B. I. Eisenstein,I. Karliner,D. Kim,N. Lowrey,P. Naik,M. Selen,E. J. White,J. Wiss,R. E. Mitchell,M. R. Shepherd,D. Besson,T. K. Pedlar,D. Cronin-Hennessy,K. Y. Gao,J. Hietala,Y. Kubota,T. Klein,B. W. Lang,R. Poling,A. W. Scott,A. Smith,P. Zweber,S. Dobbs,Z. Metreveli,K. K. Seth,A. Tomaradze,J. Ernst,Karl Matthew Ecklund,H. Severini,W. Love,V. Savinov,O. Aquines,Z. Li,A. Lopez,S. Mehrabyan,H. Mendez,J. Ramirez,G. S. Huang,D. H. Miller,V. Pavlunin,B. Sanghi,I. P. J. Shipsey,B. Xin,G. S. Adams,M. Anderson,J. P. Cummings,I. Danko,D. Hu,B. Moziak,J. Napolitano

PHYSICAL REVIEW LETTERS（2008）

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摘要

We present measurements of D -> K(S)(0)pi and D -> K(L)(0)pi branching fractions using 281 pb(-1) of psi(3770) data at the CLEO-c experiment. We find that B(D(0)-> K(S)(0)pi(0)) is larger than B(D(0)-> K(L)(0)pi(0)), with an asymmetry of R(D(0))=0.108 +/- 0.025 +/- 0.024. For B(D(+)-> K(S)(0)pi(+)) and B(D(+)-> K(L)(0)pi(+)), we observe no measurable difference; the asymmetry is R(D(+))=0.022 +/- 0.016 +/- 0.018. The D(0) asymmetry is consistent with the value based on the U-spin prediction A(D(0)-> K(0)pi(0))/A(D(0)->(K) over bar (0)pi(0))=-tan(2)theta(C), where theta(C) is the Cabibbo angle.

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physics,decay rate,multidisciplinary

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