Measurement of the Pseudoscalar Decay Constantf_D_s Using Charm-Tagged Events in E+e- Collisions Atsqrt{s}

Download or read book Measurement of the Pseudoscalar Decay Constantf_D_s Using Charm-Tagged Events in E+e- Collisions Atsqrt{s} written by and published by . This book was released on 2006 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using 230.2 fb−1 of ee− annihilation data collected with the BABAR detector at and near the peak of the?(4S) resonance, 489 ± 55 events containing the pure leptonic decay D{sub s}+ →?+?{sub?} have been isolated in charm-tagged events. The ratio of partial widths?(D{sub s}+ → {mu}+?{sub {mu}})/?(D{sub s}+ →??+) is measured to be 0.143 ± 0.018 ± 0.006 allowing a determination of the pseudoscalar decay constant f{sub D{sub 2}} = (283 ± 17 ± 7 ± 14) MeV. The errors are statistical, systematic, and from the D{sub s}+ →??+ branching ratio, respectively.