MC FF Re-weighting                                                                        Kenji Hamano

Last modified : Dec 30, 2007                                              Back to Home Back to privious page

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Document from EvtGen
guide.ps
Code from EvtGenModels
EvtGenModels/EvtGoityRoberts.cc
EvtGenModels/EvtHQET2FF.cc
EvtGenModels/EvtISGW2FF.cc

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R16b skims Run2 was used.

Tihghter Kaon Selection is applied.
D prob > 0.001 and B prob > 0.01 applied
|cosTheta_{Dl-nonDl}| < 0.92 applied

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Weights

Form Factor and weight distribution plots for D and D*

B->Dlnu (rho_D^2 = 1.17 (HFAG))	B->D*lnu
ISGW2 FF	HQET, old R1, R2, rho^2
HQET FF	HQET, new R1, R2, rho^2
RN = 1.36301	RN = 1.04412
weight	weight

Comparison of dfferential decay rates as functions of w.

differential decay rate	Dlnu dGdw	differential decay rate	D*lnu dGdw
Branching Fraction ISGW2	0.0311973	Branching Fraction ISGW2	n/a
BF HQET old slope = 0.8	0.0239236	BF HQET SP5/SP6	0.0570195
BF HQET new alope = 1.17 (HFAG)	0.0228877	BF HQET slope=1.179, R1=1.417, R2=0.836	0.0546053

Comparison of J(w) part.

differential decay rate

Dlnu FF

D*lnu FF

Form Factor and weight distribution plots for D**

B->D0*lnu	B->D1'lnu	B->D1lnu	B->D2*lnu
ISGW2 FF	ISGW2 FF	ISGW2 FF	ISGW2 FF
HQET FF	HQET FF	HQET FF	HQET FF
RN = 0.162471	RN = 0.548861	RN = 0.733062	RN = 0.749073
weight	weight	weight	weight

Comparison of dfferential decay rates as functions of w.

differential decay rate	D0star dGdw	D1' dGdw	D1 dGdw	D2star dGdw
Branching Fraction ISGW2	0.000703387	0.000895448	0.00441657	0.00234673
BF LLSW Approximation A	0.00286809	0.00167845	0.00597438	0.00237221
BF LLSW Approximation B1	0.00433118	0.00163522	0.00604722	0.00314166
BF LLSW Approximation B2	0.00373653	0.00220823	0.00590435	0.00397941

Comparison of J(w) part

B->D0*lnu	B->D1'lnu	B->D1lnu	B->D2*lnu
D0star FF	D1' FF	D1 FF	D2star FF

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D plots

D new FF (HQET) slope=1.4	D ISGW2(black) vs HQET(colored histograms)
L momentum	L momentum
D momentum	D momentum
cosBY	cosBY

D* plots

D* new FF parameters	D* old parameters(black) vs new parameters(colored histograms)
L momentum	L momentum
D momentum	D momentum
cosBY	cosBY

Note that D momentum is not D* momentum.


D** plots

D** theta dependent	D** 4 components 1	D** 4 components 2	D** ISGW2(black) vs LLSW(colored histograms)
L momentum	L momentum	L momentum	L momentum
D momentum	D momentum	D momentum	D momentum
cosBY	cosBY	cosBY	cosBY

Note that D momentum is not D** momentum.

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Effect of Re-weighting

New B decay BF from AWG (All)

D mass
Fit result
Plots : Lepton momentum (fitted binning)
       D momentum (fitted binning)
       cosBY (fitted binning)
       Bin by bin (D0)
       Bin by bin (D+)

New B decay BF from AWG (Electron)

D mass
Fit result
Plots : Lepton momentum (fitted binning)
       D momentum (fitted binning)
       cosBY (fitted binning)
       Bin by bin (D0)
       Bin by bin (D+)

New B decay BF from AWG (Muon)

D mass
Fit result
Plots : Lepton momentum (fitted binning)
       D momentum (fitted binning)
       cosBY (fitted binning)
       Bin by bin (D0)
       Bin by bin (D+)

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After FF re-weighting (All)

D mass
Fit result
Plots : Lepton momentum (Lepton momentum 2) (fitted binning)
       D momentum (D momentum 2) (fitted binning)
       cosBY (cosBY 2) (fitted binning)
       Bin by bin (D0)
       Bin by bin (D+)

After FF re-weighting (Electron)

D mass
Fit result
Plots : Lepton momentum (Lepton momentum 2) (fitted binning)
       D momentum (D momentum 2) (fitted binning)
       cosBY (cosBY 2) (fitted binning)
       Bin by bin (D0)
       Bin by bin (D+)

After FF re-weighting (Muon)

D mass
Fit result
Plots : Lepton momentum (Lepton momentum 2) (fitted binning)
       D momentum (D momentum 2) (fitted binning)
       cosBY (cosBY 2) (fitted binning)
       Bin by bin (D0)
       Bin by bin (D+)

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