We present an analysis of the decays B(0)-> K(*0)(892)gamma and B(+)-> K(*+)(892)gamma using a sample of about 383x10(6) BB events collected with the BABAR detector at the PEP-II asymmetric energy B factory. We measure the branching fractions B(B(0)-> K(*0)gamma)=(4.47 +/- 0.10 +/- 0.16)x10(-5) and B(B(+)-> K(*+)gamma)=(4.22 +/- 0.14 +/- 0.16)x10(-5). We constrain the direct CP asymmetry to be -0.033 < A(B -> K(*)gamma)< 0.028 and the isospin asymmetry to be 0.017 <Delta(0-)< 0.116, where the limits are determined by the 90% confidence interval and include both the statistical and systematic uncertainties.
Measurement of B -> K(*)(892)gamma Branching Fractions and CP and Isospin Asymmetries 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 an analysis of the decays B(0)-> K(*0)(892)gamma and B(+)-> K(*+)(892)gamma using a sample of about 383x10(6) BB events collected with the BABAR detector at the PEP-II asymmetric energy B factory. We measure the branching fractions B(B(0)-> K(*0)gamma)=(4.47 +/- 0.10 +/- 0.16)x10(-5) and B(B(+)-> K(*+)gamma)=(4.22 +/- 0.14 +/- 0.16)x10(-5). We constrain the direct CP asymmetry to be -0.033 < A(B -> K(*)gamma)< 0.028 and the isospin asymmetry to be 0.017File in questo prodotto:
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