Mainz 2004 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

T: Teilchenphysik

T 504: Schwere Quarks V

T 504.4: Vortrag

Mittwoch, 31. März 2004, 17:00–17:15, HS V

Measurement of Branching Fractions of Color-Suppressed Decays of the B⁰ Meson to D^(∗)0π⁰, D^(∗)0η, D^(∗)0 ω, and D⁰ η^′ — •Ullrich Schwanke^1,2, A. Hicheur³, H. Paar¹, and V. Tisserand³ — ¹UC San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0319, USA — ²Now at: Humboldt University, Newtonstrasse 15, 12489 Berlin, Germany — ³Laboratoire de Physique des Particules, F-74941, Annecy-le-Vieux, France

Using a sample of 88.8 × 10⁶ BB events collected with the BaBar detector at the PEP-II storage rings at the Stanford Linear Accelerator Center, we have measured the branching fractions of seven color-suppressed B-meson decays. The branching fractions for B⁰ → D^{∗ 0}η, D^{∗ 0}ω, and D⁰ η^′ were detected for the first time with more than five-sigma statistical significance. We also set an upper limit on the branching fraction for the D^{∗ 0} η^′ decay. All of these branching fractions are significantly larger than theoretical expectations based on the “naive” factorization model.