We present results from an analysis of B0(B̄0)→ρ+ρ- using 232×106 Υ(4S)→BB̄ decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. We measure the longitudinal polarization fraction fL=0.978±0.014(stat)+0.021-0.029(syst) and the CP-violating parameters SL=-0.33±0.24(stat)+0.08-0.14(syst) and CL=-0.03±0.18(stat)±0.09(syst). Using an isospin analysis of B→ρρ decays, we determine the unitarity triangle parameter α. The solution compatible with the standard model is α=(100±13) °.

Aubert, B., Barate, R., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J., et al. (2005). Improved measurement of the Cabibbo-Kobayashi-Maskawa angle α using B0(B̄)→ρ+ρ- decays. PHYSICAL REVIEW LETTERS, 95(4) [10.1103/PhysRevLett.95.041805].

Improved measurement of the Cabibbo-Kobayashi-Maskawa angle α using B0(B̄)→ρ+ρ- decays

CARPINELLI, Massimo;
2005

Abstract

We present results from an analysis of B0(B̄0)→ρ+ρ- using 232×106 Υ(4S)→BB̄ decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. We measure the longitudinal polarization fraction fL=0.978±0.014(stat)+0.021-0.029(syst) and the CP-violating parameters SL=-0.33±0.24(stat)+0.08-0.14(syst) and CL=-0.03±0.18(stat)±0.09(syst). Using an isospin analysis of B→ρρ decays, we determine the unitarity triangle parameter α. The solution compatible with the standard model is α=(100±13) °.
Articolo in rivista - Articolo scientifico
Electromagnetic wave polarization; Mathematical models; Parameter estimation; Particle detectors; Asymmetric-energy; Longitudinal polarization fraction; Standard model; High energy physics;
English
2005
95
4
041805
none
Aubert, B., Barate, R., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J., et al. (2005). Improved measurement of the Cabibbo-Kobayashi-Maskawa angle α using B0(B̄)→ρ+ρ- decays. PHYSICAL REVIEW LETTERS, 95(4) [10.1103/PhysRevLett.95.041805].
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/10281/389889
Citazioni
  • Scopus 50
  • ???jsp.display-item.citation.isi??? 26
Social impact