Measurement of B(Ds+ → μ+νμ)B(Ds+ → φμ+νμ) and determination of the decay constant fDs

K. Kodama,S Torikai,N. Ushida,A. Mokhtarani,V. Paolone,J. T. Volk,J. O. Wilcox,P. M. Yager,R. M. Edelstein,A. P. Freyberger,D. B. Gibaut,Ron Lipton,William R. Nichols,D. M. Potter,James Russ,C. Zhang,Y. Zhang,H. I. Jang, J. Y. Kim,B. Baller,R. J. Stefanski,Kazuma Nakazawa,S. H. Chung,M. S. Park,I. G. Park,J. S. Song,C. S. Yoon,M. Aryal,N. W. Reay,R. A. Sidwell,N. R. Stanton,S. Yoshida,Michiyuki Chikawa,T. Hara,Shigeki Aoki,K. Hoshino,Makoto Kobayashi,Masahiro Komatsu,Motoaki Miyanishi,M. Nakamura,S. Nakanishi,Kimio Niwa,M. Nomura,K. Okada,H. Tajima,K Teraoka,J. M. Dunlea,S. G. Frederiksen,S. Kuramata,B. G. Lundberg,G. A. Oleynik,K. Reibel,George R. Kalbfleisch,P. Skubic,J. Snow,S. E. Willis,K. Nakamura,T. Okusawa,Tomoko Yoshida,H. Okabe,J. Yokota,N Ihara,M. Kazuno,T. Koya,E. Niu,S. Ogawa,H. Shibuya,S. Watanabe,N. Yasuda,K Ehara,K Horie,Yoshihiro Sato,K Suzuki,I. Tezuka

Physics Letters B（1996）

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Abstract

Abstract We have observed 23.2 ± 6.0−0.9+1.0 purely-leptonic decays of Ds+ → μ+νμ from a sample of muonic one prong decay events detected in the emulsion target of Fermilab experiment E653. Using the Ds+ → φμ+νμ yield measured previously in this experiment, we obtain B(D s + → μ + ν μ ) B(D s + → φμ + ν μ ) = 0.16 ± 0.06 ± 0.03 . In addition, we extract the decay constant fDs = 194 ± 35 ± 20 ± 14 MeV.

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Key words

decay

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