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.
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