Analysis of theD+→K−π+e+νedecay channel
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Abstract
Using 347.5 fb-1 of data recorded by the BABAR detector at the PEP-II electron-positron collider, 244103 signal events for the D+K-+e+e decay channel are analyzed. This decay mode is dominated by the K *(892)0 contribution. We determine the K *(892)0 parameters: mK*(892)0=(895.40.20.2) MeV/c2, K*(892)00=(46.50.30.2) MeV/c2, and the Blatt-Weisskopf parameter rBW=2.10.50.5 (GeV/c)-1, where the first uncertainty comes from statistics and the second from systematic uncertainties. We also measure the parameters defining the corresponding hadronic form factors at q2=0 (rV=V(0)/A1(0)=1.4630.0170.031, r2=A2(0)/A1(0)=0.8010.0200.020) and the value of the axial-vector pole mass parametrizing the q2 variation of A1 and A2: mA=(2.630.100.13) GeV/c2. The S-wave fraction is equal to (5.790.160.15)%. Other signal components correspond to fractions below 1%. Using the D+K-++ channel as a normalization, we measure the D+ semileptonic branching fraction: B(D+K-+e+e)=(4.000.030.040.09)10-2, where the third uncertainty comes from external inputs. We then obtain the value of the hadronic form factor A1 at q2=0: A1(0)=0.62000.00560.00650.0071. Fixing the P-wave parameters, we measure the phase of the S wave for several values of the K mass. These results confirm those obtained with K production at small momentum transfer in fixed target experiments.
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