Direct Measurement Of The Branching Fraction For The Decay Of D+ -> K-E(0)+V(E) And Determination Of Gamma(D-0 -> K(-)E(+)V(E))/Gamma(D+ -> K(0)E(+)V(E))

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PHYSICS LETTERS B（2005）

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摘要

The absolute branching fraction for the decay D+ --> (K) over bar (0)e(+)nu(e) is determined using 5321 +/- 149 +/- 160 singly tagged D- event sample from the data collected around 3.773 GeV with the BES-II detector at the BEPC collider. In the system recoiling against the singly tagged D- mesons, 34.4 +/- 6.1 events for D+ --> (K) over bar (0)e(+)nu(e) are observed. Those yield the absolute branching fraction to be BF(D+ --> (K) over bar (0)e(+)nu(e)) = (8.95 +/- 1.59 +/- 0.67)%. The ratio of the two partial widths for the decays of D-0 --> (K) over bar (0)e(+)nu(e) and D+ --> (K) over bar (0)e(+)nu(e) is determined to be Gamma(D-0 --> K(-)e(+)nu(e))/Gamma(D+ --> (K) over bar (0)e(+)nu(e)) = 1.08 +/- 0.22 +/- 0.07. (C) 2004 Elsevier B.V. All rights reserved.

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