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The shape of the hadronic form factor f+(q2) in the decay D0 --> K- e+ nuehas been measured in a model independent analysis and compared with theoreticalcalculations. We use 75 fb(-1) of data recorded by the BABAR detector at thePEPII electron-positron collider. The corresponding decay branching fraction,relative to the decay D0 --> K- pi+, has also been measured to be RD = BR(D0--> K- e+ nue)/BR(D0 --> K- pi+) = 0.927 +/- 0.007 +/- 0.012. From theseresults, and using the present world average value for BR(D0 --> K- pi+), thenormalization of the form factor at q2=0 is determined to be f+(0)=0.727 +/-0.007 +/- 0.005 +/- 0.007 where the uncertainties are statistical, systematic,and from external inputs, respectively.

Measurement of the Hadronic Form Factor in D0 --> K- e+ nue Decays