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Direct measurements of the branching fractions for D0→K−e+νe and D0→π−e+νe and determinations of the form factors f+K(0) and f+π(0)
- Source :
- Physics Letters B. (1):39-46
- Publisher :
- Elsevier B.V.
-
Abstract
- The absolute branching fractions for the decays D0→K−e+νe and D0→π−e+νe are determined using 7584±198±341 singly tagged D¯0 sample from the data collected around 3.773 GeV with the BES-II detector at the BEPC. In the system recoiling against the singly tagged D¯0 meson, 104.0±10.9 events for D0→K−e+νe and 9.0±3.6 events for D0→π−e+νe decays are observed. Those yield the absolute branching fractions to be BF(D0→K−e+νe)=(3.82±0.40±0.27)% and BF(D0→π−e+νe)=(0.33±0.13±0.03)%. The vector form factors are determined to be |f+K(0)|=0.78±0.04±0.03 and |f+π(0)|=0.73±0.14±0.06. The ratio of the two form factors is measured to be |f+π(0)/f+K(0)|=0.93±0.19±0.07.
Details
- Language :
- English
- ISSN :
- 03702693
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Physics Letters B
- Accession number :
- edsair.core.ac.uk....d2a2508d8487e4e9c94ac33bf40c067c
- Full Text :
- https://doi.org/10.1016/j.physletb.2004.07.004