BABAR Publications

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PUB-08/014 Study of the decay Ds+ -> K+ K- e+ nu_e
Doc Type Journal Papers
Record Created April 17, 2008
SLAC-PUB
SLAC-PUB-13294  No citations
Preprint # 0807.1599 [hep-ex]
Accession Code DUR1027
First Author Aubert
Abstract
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Using 214 fb-1 of data recorded by the Babar detector
at the PEPII electron-positron collider, we study the
decay Ds+ --> K+ K- e+ nu. 
Except for a small S-wave contribution, 
 the events with K+K- masses in the range 1.01-1.03 GeV/c2 correspond to phi mesons.
For Ds+ --> phi e+ nu decays, we measure the relative normalization  
of the Lorentz invariant form factors at q2=0, 
rV=V(0)/A1(0)=1.849 +/- 0.060 +/- 0.095, r2=A2(0)/A1(0)=0.763 +/- 0.071 +/- 0.065 and the pole mass of the axial-vector 
form factors mA=(2.28^{+0.23}_{-0.18}+/- 0.18) GeV/c2.
Within the same K+K- mass range, we also measure the relative  branching fraction B(Ds+ --> K+ K- e+ nu)/B(Ds+ --> K+ K- pi+)=0.558 +/- 0.007 +/- 0.016,  from which we obtain the 
 total branching fraction  B(Ds+ --> phi e+ nu) = (2.61 +/- 0.03 +/- 0.08 +/- 0.15)* 10^{-2}.
By comparing this value with the predicted decay rate, we extract 
A1(0) = 0.607 +/- 0.011 +/- 0.019 +/- 0.018.
The stated uncertainties are statistical, systematic, and  from external inputs.
Revisions and Files 1 revised April 17, 2008
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Thumbnails
File Name File Type File Format File Size (Kb) Comments
16-JUL-2008 abstract.txt Abstract txt 1.01
16-JUL-2008 babar-pub-08014.pdf Paper (journal paper or conference submission by BABAR Collaboration) pdf 189.05
16-JUL-2008 babar-pub-08014.ps.gz Paper (journal paper or conference submission by BABAR Collaboration) ps.gz 201.41
16-JUL-2008 fig01.eps Figure or plot eps 41.94
16-JUL-2008 fig02.eps Figure or plot eps 70.53
Submitted ToPhysical Review D - Rapid Communications
Date SubmittedJuly 15, 2008
Journal Year2008
Journal Volume78
Journal Article/Page Range051101
Categories
  • AWG: Semileptonic