Precision measurement of B(D+→μ+ν) and the pseudoscalar decay constant fD+

B. I. Eisenstein, I. Karliner,S. Mehrabyan,N. Lowrey,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,P. Zweber,S. Dobbs,Z. Metreveli,K. K. Seth, A. Tomaradze,J. Libby,L. Martin,A. Powell, G. Wilkinson,K. M. Ecklund, V. Savinov,H. Mendez,J. Y. Ge,D. H. Miller, I. P. J. Shipsey,B. Xin, G. S. Adams,M. Anderson,J. P. Cummings,I. Danko,D. Hu,J. Napolitano,J. Insler,H. Muramatsu,E. H. Thorndike, F. Yang,M. Artuso,S. Blusk, S. Khalil, J. Li,N. Menaa,S. Nisar, K. Randrianarivony,N. Sultana,T. Skwarnicki,J. C. Wang, L. M. Zhang,G. Bonvicini,D. Cinabro, M. Dubrovin,A. Lincoln,P. Naik, J. Rademacker,D. M. Asner, K. W. Edwards,J. Reed, R. A. Briere,T. Ferguson,G. Tatishvili,H. Vogel,M. E. Watkins,J. L. Rosner, J. P. Alexander,D. G. Cassel,J. E. Duboscq,R. Ehrlich,R. S. Galik, L. Gibbons,R. Gray, S. W. Gray,D. L. Hartill, B. K. Heltsley,D. Hertz,J. M. Hunt,J. Kandaswamy,D. L. Kreinick,V. E. Kuznetsov,J. Ledoux,H. Mahlke-Kruger,D. Mohapatra,J. R. Patterson, D. Peterson, D. Riley, A. Ryd,A. J. Sadoff,S. Stroiney, W. M. Sun,T. Wilksen,S. B. Athar,R. Patel,J. Yelton,P. Rubin,A. Sadoff, X. Shi,S. Stroiney, W. Sun,T. Wilksen,S. Athar,R. Patel,J. Yelton,P. Rubin

PHYSICAL REVIEW D（2008）

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Abstract

We measure the branching ratio of the purely leptonic decay of the D+ meson with unprecedented precision as B(D+ -> mu(+nu)) = (3.82 +/- 0.32 +/- 0.09) x 10(-4), using 818 pb(-1) of data taken on the psi(3770) resonance with the CLEO-c detector at the CESR collider. We use this determination to derive a value for the pseudoscalar decay constant f(D+), combining with measurements of the D+ lifetime and assuming vertical bar V-cd vertical bar = vertical bar V-us vertical bar. We find f(D+) = (205.8 +/- 8.5 +/- 2.5) MeV. The decay rate asymmetry Gamma(D+ -> mu(+)nu) - Gamma(D- -> mu(-) (nu) over bar) / Gamma(D+ -> mu(+)nu) + Gamma(D- -> mu(-) (nu) over bar) = 0.08 +/- 0.08, consistent with no CP violation. We also set 90% confidence level upper limits on B(D+ -> tau(+) v) < 1.2 x 10(-3) and B(D+ -> e(+) v) < 8.8 x 10(-6).

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Key words

cp violation,decay rate,elementary particles,confidence level

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