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

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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. doi:10.1103/PhysRevLett.102.141802 ISSN 0031-9007.

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

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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, Engineering and Medicine > Science > Physics
Journal or Publication Title: Physical Review Letters
Publisher: American Physical Society
ISSN: 0031-9007
Official Date: 10 April 2009
Dates:
DateEvent
10 April 2009Published
Volume: Vol.102
Number: No.14
Number of Pages: 7
Page Range: article no.141802
DOI: 10.1103/PhysRevLett.102.141802
Status: Peer Reviewed
Publication Status: Published
Funder: DOE and NSF (USA), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MEC (Spain), STFC (United Kingdom), Marie Curie EIF (European Union), A.P. Sloan Foundation

Data sourced from Thomson Reuters' Web of Knowledge

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