Dortmund 2006 – scientific programme

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T: Teilchenphysik

T 601: Seltene Zerf
älle

T 601.2: Talk

Friday, March 31, 2006, 11:30–11:45, HG2-HS2

Charm Baryon Studies at BABAR — •Wolfgang Mader — Technische Universitaet Dresden — The University of Iowa

We report on the analysis of charmed baryon production and decay. The data samples used for this analyses are taken with the BaBar detector at the asymmetric e⁺e⁻ B factory PEP-II at SLAC. The samples consist of data taken at the Υ(4S) resonance (on-peak data) and data taken approximately 40 MeV below (off-peak data).

We study the charm baryon Ξ_c⁰ in its decay modes into Ξ⁻π⁺ and Ω⁻K⁺ using ∼ 116 fb⁻¹ of data. We measure the ratio of branching fractions, the branching fraction product B(B→Ξ_c⁰ X)× B(Ξ_c⁰→ Ξ⁻ π⁺) and the cross section product σ(e⁺e⁻→ cc→Ξ_c⁰ X)× B(Ξ_c⁰→Ξ⁻π⁺).

The Ω_c⁰ charmed baryon is reconstructed in its decay modes into Ω⁻π⁺, Ω⁻π⁺π⁻π⁺, and Ξ⁻ K⁻π⁺π⁺ using ∼ 230 fb⁻¹ of data. We measure the ratio of branching fractions relative to the Ω⁻π⁺ mode.

For both charmed baryons we study the production mechanism by measuring their momentum spectra in the center-of-mass frame. By comparing on-peak and off-peak data, clear evidence for copious production of these charm baryons from B decays is found. In the case of the Ω_c⁰, this measurement constitutes a first time observation of the process B→Ω_c⁰ X.