doc/v620/rf513__wsfactory__tools_8py.html

import ROOT


w = ROOT.RooWorkspace("w")


# Build a complex example pdf

# -----------------------------------------------------------


# Make signal model for CPV: A bmixing decay function in t (convoluted with a triple Gaussian resolution model)

# times a Gaussian function the reconstructed mass

w.factory(

    "PROD::sig(  BMixDecay::sig_t( dt[-20,20], mixState[mixed=1,unmix=-1], tagFlav[B0=1,B0bar=-1], "

    "tau[1.54], dm[0.472], w[0.05], dw[0], "

    "AddModel::gm({GaussModel(dt,biasC[-10,10],sigmaC[0.1,3],dterr[0.01,0.2]), "

    "GaussModel(dt,0,sigmaT[3,10]), "

    "GaussModel(dt,0,20)},{fracC[0,1],fracT[0,1]}), "

    "DoubleSided ), "

    "Gaussian::sig_m( mes[5.20,5.30], mB0[5.20,5.30], sigmB0[0.01,0.05] ))")


# Make background component: A plain decay function in t times an Argus

# function in the reconstructed mass

w.factory("PROD::bkg(  Decay::bkg_t( dt, tau, gm, DoubleSided), "

          "ArgusBG::bkg_m( mes, 5.291, k[-100,-10]))")


# Make composite model from the signal and background component

w.factory("SUM::model( Nsig[5000,0,10000]*sig, NBkg[500,0,10000]*bkg )")


# Example of RooSimWSTool interface

# ------------------------------------------------------------------


# Introduce a flavour tagging category tagCat as observable with 4 states corresponding

# to 4 flavour tagging techniques with different performance that require different

# parameterizations of the fit model

#

# ROOT.RooSimWSTool operation:

#     - Make 4 clones of model (for each tagCat) state, will gain an individual

#       copy of parameters w, and biasC. The other parameters remain common

#     - Make a simultaneous p.d.f. of the 4 clones assigning each to the appropriate

#       state of the tagCat index category


# ROOT.RooSimWSTool is interfaced as meta-type SIMCLONE in the factory. The $SplitParam()

# argument maps to the SplitParam() named argument in the

# ROOT.RooSimWSTool constructor

w.factory(

    "SIMCLONE::model_sim( model, $SplitParam({w,dw,biasC},tagCat[Lep,Kao,NT1,NT2]))")


# Example of RooCustomizer interface

# -------------------------------------------------------------------

#

# Class ROOT.RooCustomizer makes clones of existing p.d.f.s with certain prescribed

# modifications (branch of leaf node replacements)

#

# Here we take our model (the original before ROOT.RooSimWSTool modifications)

# and request that the parameter w (the mistag rate) is replaced with

# an expression-based function that calculates w in terms of the Dilution

# parameter D that is defined D = 1-2*w


# Make a clone model_D of original 'model' replacing 'w' with

# 'expr('0.5-D/2',D[0,1])'

w.factory("EDIT::model_D(model, w=expr('0.5-D/2',D[0,1]) )")


# Print workspace contents

w.Print()


# Make workspace visible on command line

ROOT.gDirectory.Add(w)