Measurement of R(D) and R(D*) Using Semileptonic Tags and Hadronic τ Decays

Jae Hong Kim
We present a measurement of R(D(*)) = B(B → D̅(*) τντ)/B(B → D̅(*) ℓνℓ) using semileptonic tagging and hadronic τ decays on the 433 fb-1 of data collected at the Υ(4S) resonance using the BaBar detector at the PEP-II collider. We obtain a high statistics data sample using loose selection criteria. The signal is extracted by performing a 2-dimensional fit of the component densities to the kernel density estimate of the data, which is made...
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