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Improved measurement of B+->rho(+)rho(0) and determination of the quark-mixing phase angle alpha

Tools

BaBar Collaboration (Including:

Aubert, B., Karyotakis, Y., Lees, J. P., Poireau, V., Prencipe, E., Prudent, X., Tisserand, V., Tico, J. Garra, Grauges, E., Lopez, L. et al.

). (2009) Improved measurement of B+->rho(+)rho(0) and determination of the quark-mixing phase angle alpha. Physical Review Letters, Vol.102 (No.14). article no.141802. ISSN 0031-9007

Full text not available from this repository.

Official URL: http://dx.doi.org/10.1103/PhysRevLett.102.141802

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(-VtdVtb*/VudVub*) to be (92.4(-6.5)(+6.0))degrees.

Item Type:

Journal Article

Subjects:

Q Science > QC Physics

Divisions:

Faculty of Science > Physics

Journal or Publication Title:

Physical Review Letters

Publisher:

American Physical Society

ISSN:

0031-9007