We present a measurement of the branching fraction for the rare decays B→ρeν and extract a value for the magnitude of Vub, one of the smallest elements of the Cabibbo-Kobayashi-Maskawa quark-mixing matrix. The results are given for five different calculations of form factors used to parametrize the hadronic current in semileptonic decays. Using a sample of 55×106 BB̅ meson pairs recorded with the BABAR detector at the PEP-II e+e- storage ring, we obtain B(B0→ρ-e+ν)=(3.29±0.42±0.47±0.55)×10-4 and |Vub|=(3.64±0.22±0.25-0.56+0.39)×10-3, where the uncertainties are statistical, systematic, and theoretical, respectively.

Measurement of the Cabibbo-Kobayashi-Maskawa Matrix Element |Vub| with B→ρeν Decays

LO VETERE, MAURIZIO;MONGE, MARIA ROBERTA;PATRIGNANI, CLAUDIA;TOSI, SILVANO;
2003-01-01

Abstract

We present a measurement of the branching fraction for the rare decays B→ρeν and extract a value for the magnitude of Vub, one of the smallest elements of the Cabibbo-Kobayashi-Maskawa quark-mixing matrix. The results are given for five different calculations of form factors used to parametrize the hadronic current in semileptonic decays. Using a sample of 55×106 BB̅ meson pairs recorded with the BABAR detector at the PEP-II e+e- storage ring, we obtain B(B0→ρ-e+ν)=(3.29±0.42±0.47±0.55)×10-4 and |Vub|=(3.64±0.22±0.25-0.56+0.39)×10-3, where the uncertainties are statistical, systematic, and theoretical, respectively.
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/11567/384245
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 30
  • ???jsp.display-item.citation.isi??? 111
social impact