Ronald Jacobsen

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A search for the exclusive radiative decays B → ρ(770)γ and B 0 → ω(782)γ is performed on a sample of 84 million BB events collected by the BABAR detector at the P EP − II asymmetric e + e − collider. No significant signal is seen in any of the channels. We set preliminary upper limits of B[B 0 → ρ 0 γ] < 1.4 × 10 −6 , B[B + → ρ + γ] < 2.3 × 10 −6 and B[B 0(More)
The D 0 mixing parameter y = ∆Γ/2Γ was determined by measuring the D 0 lifetime separately for the K − π + decay mode and the K − K + decay mode with 12.4 fb −1 of data collected by the BABAR experiment in 2001. Backgrounds were suppressed with the D * → D 0 π + decay and particle identification. The following preliminary result was obtained: y = (−1.0 ±(More)
The SLC linac must produce stable high energy, low emittance beams to make maximum luminosity. The incoming beam conditions must be correct and stable. The trajectories of the two beams must be controlled to about 100 pm. The energy and energy spectrum of each beam are controlled to a few parts per thousand. The beam transverse dimensions are measured to be(More)
Using about 23M BB events collected in 1999-2000 with the BABAR detector, we report the observation of several hundred B → D (*) D (*) K decays with two completely reconstructed D mesons. The preliminary branching fractions of the low background decay modes B 0 → D * − D (*)0 K + are determined to be B(B 0 → D * − D 0 K +) = (2.8 ± 0.7 ± 0.5) × 10 −3 and(More)
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