Difference: AsymmetryFitting (9 vs. 10)

Revision 102010-10-04 - AlisonBates

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META TOPICPARENT	name="WebHome"

B2hh GFact Asymmetry Fitting page

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I am studiying the pdf obtained from the following distribution

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f(t|tmin,signal)=N.1/τ.exp(-t/τ)[1+q(1-2ω){Adir.cos(Δmt)-Amix.cos(Δmt)}Θ(t)conv 1/√2πexp-(t'-t)^2/2σ^2

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f(t|tmin,signal)=N.1/τ.exp(-t/τ).[cosh(ΔΓ.t/2)-A_ΔΓ.sinh(ΔΓ/2)].[1+q(1-2ω).(Adir.cos(Δmt)-Amix.cos(Δmt))].Θ(t) conv 1/√2πexp-(t'-t)^2/2σ^2

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and obtained the following for q=+1 (red) and q=-1(blue).

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and obtained the following for q=+1 (red) and q=-1(blue)....

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Basic Checks with asymmetry fitter

Toy data was generated with a mix of 56.1% Bd → π π, 10.3% Bd → K π and 33.6% combinatoric background with ssb of 0.664 (ssb is S/S+B) generated in a mass region of 5-5.8 GeV. The mistag rates in generation and fitting was ωBs = 0.361and ωBd = 0.355 and ACPBd→Kπ = 0.1. 100 data sets with 100,000 events per data set was used here but Lars ran with 1000 data sets with 100k events per set and found no bias on the pulls and much improved uncertainties. I just show the plots below (100 data sets) for completion.

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