We search for the decays B0→ρ0ρ0, B0→ρ0f0(980), and B0→f0(980)f0(980) in a sample of about 384×106 Υ(4S) →BB̄ decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at Stanford Linear Accelerator Center. We find evidence for B0→ρ0ρ0 with 3.5σ significance and measure the branching fraction B=(1.07±0.33±0.19)×10-6 and longitudinal polarization fraction fL=0.87±0.13±0.04, where the first uncertainty is statistical, and the second is systematic. The uncertainty on the Cabibbo-Kobayashi-Maskawa quark-mixing matrix unitarity angle α due to penguin contributions in B→ρρ decays is 18° at the 1σ level. We also set upper limits on the B0→ρ0f0(980) and B0→f0(980)f0(980) decay rates.

Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J., Poireau, V., et al. (2007). Evidence for B0→ρ0ρ0 decays and implications for the Cabibbo-Kobayashi-Maskawa angle α. PHYSICAL REVIEW LETTERS, 98(11) [10.1103/PhysRevLett.98.111801].

Evidence for B0→ρ0ρ0 decays and implications for the Cabibbo-Kobayashi-Maskawa angle α

CARPINELLI, Massimo;
2007

Abstract

We search for the decays B0→ρ0ρ0, B0→ρ0f0(980), and B0→f0(980)f0(980) in a sample of about 384×106 Υ(4S) →BB̄ decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at Stanford Linear Accelerator Center. We find evidence for B0→ρ0ρ0 with 3.5σ significance and measure the branching fraction B=(1.07±0.33±0.19)×10-6 and longitudinal polarization fraction fL=0.87±0.13±0.04, where the first uncertainty is statistical, and the second is systematic. The uncertainty on the Cabibbo-Kobayashi-Maskawa quark-mixing matrix unitarity angle α due to penguin contributions in B→ρρ decays is 18° at the 1σ level. We also set upper limits on the B0→ρ0f0(980) and B0→f0(980)f0(980) decay rates.
Articolo in rivista - Articolo scientifico
Colliding beam accelerators; Electromagnetic waves; Linear accelerators; Particle detectors; Polarization; Statistical methods; BABAR detectors; Branching fraction; Cabibbo Kobayashi Maskawa angles; PEP-II asymmetric energy; High energy physics;
English
2007
98
11
111801
none
Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J., Poireau, V., et al. (2007). Evidence for B0→ρ0ρ0 decays and implications for the Cabibbo-Kobayashi-Maskawa angle α. PHYSICAL REVIEW LETTERS, 98(11) [10.1103/PhysRevLett.98.111801].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/389698
Citazioni
  • Scopus 22
  • ???jsp.display-item.citation.isi??? 11
Social impact