We report the observation of the b→d penguin-dominated decay B0→K*0K̄*0 with a sample of 383.2±4.2 million BB̄ pairs collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at the Stanford Linear Accelerator Center. The measured branching fraction is B(B0→K*0K̄*0)=[1.28-0.30+0.35±0.11] ×10-6 and the fraction of longitudinal polarization is fL(B0→K*0K̄*0)=0.80-0.12+0.10±0.06. The first error quoted is statistical and the second systematic. We also obtain an upper limit at the 90% confidence level on the branching fraction for B(B0→ K*0K*0)<0.41×10-6.

Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J., Poireau, V., et al. (2008). Observation of B0→K*0K̄*0 and search for B0→K*0K*0. PHYSICAL REVIEW LETTERS, 100(8) [10.1103/PhysRevLett.100.081801].

Observation of B0→K*0K̄*0 and search for B0→K*0K*0

CARPINELLI, Massimo;
2008

Abstract

We report the observation of the b→d penguin-dominated decay B0→K*0K̄*0 with a sample of 383.2±4.2 million BB̄ pairs collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at the Stanford Linear Accelerator Center. The measured branching fraction is B(B0→K*0K̄*0)=[1.28-0.30+0.35±0.11] ×10-6 and the fraction of longitudinal polarization is fL(B0→K*0K̄*0)=0.80-0.12+0.10±0.06. The first error quoted is statistical and the second systematic. We also obtain an upper limit at the 90% confidence level on the branching fraction for B(B0→ K*0K*0)<0.41×10-6.
Articolo in rivista - Articolo scientifico
Linear accelerators; Polarization; Statistical methods; Asymmetric energy; Longitudinal polarization; High energy physics;
English
2008
100
8
081801
none
Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J., Poireau, V., et al. (2008). Observation of B0→K*0K̄*0 and search for B0→K*0K*0. PHYSICAL REVIEW LETTERS, 100(8) [10.1103/PhysRevLett.100.081801].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/389638
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