We present improved measurements of the branching fraction B, the longitudinal polarization fraction f(L), and the direct CP asymmetry A(CP) in the B meson decay channel B(+)->rho(+)rho(0). The data sample was collected with the BABAR detector at SLAC. The results are B(B(+)->rho(+)rho(0))=(23.7 +/- 1.4 +/- 1.4)x10(-6), f(L)=0.950 +/- 0.015 +/- 0.006, and A(CP)=-0.054 +/- 0.055 +/- 0.010, where the uncertainties are statistical and systematic, respectively. Based on these results, we perform an isospin analysis and determine the Cabibbo-Kobayashi-Maskawa phase angle alpha=arg(-V(td)V(tb)(*)/V(ud)V(ub)(*)) to be (92.4(-6.5)(+6.0))degrees.

Improved Measurement of B(+)->rho(+)rho(0) and Determination of the Quark-Mixing Phase Angle alpha RID C-5223-2009

LUSIANI, Alberto;
2009

Abstract

We present improved measurements of the branching fraction B, the longitudinal polarization fraction f(L), and the direct CP asymmetry A(CP) in the B meson decay channel B(+)->rho(+)rho(0). The data sample was collected with the BABAR detector at SLAC. The results are B(B(+)->rho(+)rho(0))=(23.7 +/- 1.4 +/- 1.4)x10(-6), f(L)=0.950 +/- 0.015 +/- 0.006, and A(CP)=-0.054 +/- 0.055 +/- 0.010, where the uncertainties are statistical and systematic, respectively. Based on these results, we perform an isospin analysis and determine the Cabibbo-Kobayashi-Maskawa phase angle alpha=arg(-V(td)V(tb)(*)/V(ud)V(ub)(*)) to be (92.4(-6.5)(+6.0))degrees.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11384/5023
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