GLAS-PPE/2009-27

A non-parametric method to estimate the Forward Backward Asymmetry from the B_d-> K* mu⁺ mu^- decay at LHCb

F Marinho(1), C Parkes(1), S Viret(1,2)

(1) University of Glasgow, Kelvin Building, Glasgow G12 8QQ, Scotland.
(2) Now at CNRS, Clermont-Ferrand.

This note discusses the use of a non-parametric unbinned method to evaluate the dimuon mass squared distribution and the Forward Backward asymmetry (FBA) from the B_d-> K* mu⁺ mu^- decay. This method gives access to the complete shape of the FBA distribution: the FBA zero point is obtained directly, no straight line fit or other assumptions on the shape of the distribution are required. The implementation of this approach and the results obtained using simulated events are presented. The sensitivity obtained for the FBA zero point was σ_{Zero Point} = 0.40 ± 0.04 GeV²/ c⁴ for an integrated luminosity of 2 fb^-1.

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