We present measurements of the branching fraction and fraction of longitudinal polarization for the decay B(+) -> (K) over bar*(0)K*(+) with a sample of (467 +/- 5) x 10(6) B (B) over bar B pairs collected with the BABAR detector at the PEP- II asymmetric- energy e(+)e(-) collider at the SLAC National Accelerator Laboratory. We obtain the branching fraction B(B(+) -> (K) over bar*(0)K*(+)) = (1.2 +/- 0.5 +/- 0.1) x 10(-6) with a significance of 3.7 standard deviations including systematic uncertainties. We measure the fraction of longitudinal polarization f(L) = 0.75(-0.26)(+0.16) +/- 0.03. The first error quoted is statistical and the second is systematic.
Evidence for B(+) -> (K)over-bar*(0)K*(+) RID C-5223-2009
ANGELINI, CARLO;BATIGNANI, GIOVANNI;BETTARINI, STEFANO;CALDERINI, GIOVANNI;FORTI, FRANCESCO;GIORGI, MARCELLO;PAOLONI, EUGENIO;RIZZO, GIULIANA;
2009-01-01
Abstract
We present measurements of the branching fraction and fraction of longitudinal polarization for the decay B(+) -> (K) over bar*(0)K*(+) with a sample of (467 +/- 5) x 10(6) B (B) over bar B pairs collected with the BABAR detector at the PEP- II asymmetric- energy e(+)e(-) collider at the SLAC National Accelerator Laboratory. We obtain the branching fraction B(B(+) -> (K) over bar*(0)K*(+)) = (1.2 +/- 0.5 +/- 0.1) x 10(-6) with a significance of 3.7 standard deviations including systematic uncertainties. We measure the fraction of longitudinal polarization f(L) = 0.75(-0.26)(+0.16) +/- 0.03. The first error quoted is statistical and the second is systematic.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
