def ChiAndCharm ( self ) :
"""
Get charm & chi:
Select events with at leats one charm particle and
at least one chi
"""
sel = self._selection ( 'ChiAndCharm_Selection' )
if sel : return sel
cmb = CombineParticles (
##
DecayDescriptors = [
"[ Upsilon(1S) -> J/psi(1S) D0 gamma ]cc" ,
"[ Upsilon(1S) -> J/psi(1S) D*(2010)+ gamma ]cc" ,
"[ Upsilon(1S) -> J/psi(1S) D+ gamma ]cc" ,
"[ Upsilon(1S) -> J/psi(1S) D_s+ gamma ]cc" ,
"[ Upsilon(1S) -> J/psi(1S) Lambda_c+ gamma ]cc"
] ,
##
DaughtersCuts = {
# J/psi Upsilon(1S)
"J/psi(1S)" : " ( M < 3.21 * GeV ) | in_range ( 9.3 * GeV , M , 9.6 * GeV ) " ,
"gamma" : " ( PT > 500 * MeV ) & ( CL > 0.05 ) "
},
## require chi_(c,b)
CombinationCut = """
AM13 - AM1 < 1.01 * GeV
""",
##
MotherCut = " ALL "
)
##
sel_ = Selection (
"ChiAndCharmPreFor" + self.name() ,
Algorithm = cmb ,
RequiredSelections = [ self.DiMuonAndCharm () , ## fake one!
self.DiMuon () ,
self.PromptCharm () ,
StdLooseAllPhotons ]
)
## apply pi0-veto-tagger !
from GaudiConfUtils.ConfigurableGenerators import Pi0Veto__Tagger
tag = Pi0Veto__Tagger (
MassWindow = 25 * MeV ,
MassChi2 = -1 ,
ExtraInfoIndex = 25010 ## unique !
)
## the final selection
sel = Selection (
"SelChiAndCharmFor" + self.name() ,
Algorithm = tag ,
RequiredSelections = [ sel_ ]
)
return self._add_selection( 'ChiAndCharm_Selection' , sel )
def makeDsg_vetoed(name,
DsgSel
):
from GaudiConfUtils.ConfigurableGenerators import Pi0Veto__Tagger
_g = Pi0Veto__Tagger(
MassWindow = 25,
MassChi2 = -1 ,
ExtraInfoIndex = 25040 ## unique !
)
return Selection(name, Algorithm=_g, RequiredSelections=[DsgSel])
def etap2rhog ( self ) :
"""
Preselection for Eta' -> rho gamma
"""
sel = self._selection ( 'Etap2rhog_Selection')
if sel : return sel
##
_alg = CombineParticles (
##
DecayDescriptor = " eta_prime -> pi+ pi- gamma" ,
##
DaughtersCuts = {
'gamma' : self['GammaCut']
} ,
##
CombinationCut = """
( APT > %s ) &
in_range ( 500 * MeV , AM12 , 950 * MeV ) &
( ADAMASS ( 'eta_prime' ) < 100 * MeV )
""" % ( 0.9 * self['X0PT'] ) ,
##
MotherCut = """
( PT > %s ) & ( chi2vx < 16 )
""" % self['X0PT'] ,
##
ParticleCombiners = { '' : "LoKi::VertexFitter" }
)
##
_sel = Selection (
"SelPreEtap2rhogFor" + self.name() ,
Algorithm = _alg ,
RequiredSelections = [ self.pions () ,
self.gamma () ]
)
##
_tag = Pi0Veto__Tagger (
MassWindow = 25 * MeV ,
MassChi2 = -1 ,
ExtraInfoIndex = 25017 ## unique !
)
##
sel = Selection (
"SelEtap2rhogFor" + self.name() ,
Algorithm = _tag ,
RequiredSelections = [ _sel ]
)
return self._add_selection( 'Etap2rhog_Selection' , sel )
def ChiAndW(self):
"""
select dimuon + W+
"""
sel = self._selection('ChiW_Selection')
if sel: return sel
_alg = CombineParticles(
##
DecayDescriptor="[chi_b2(2P) -> J/psi(1S) gamma mu+]cc",
##
DaughtersCuts={
"J/psi(1S)":
" ( M < 3.21 * GeV ) | in_range ( 8.5 * GeV , M , 12.0 * GeV ) ",
'gamma': self['GammaChi']
},
## mimic chi_(c,b):
CombinationCut="""
( AM12 - AM1 < 1.05 * GeV ) |
( AM12 - AM1 < 1.05 * GeV )
""",
MotherCut=" ALL ")
_sel = Selection(
"SelPreChiAndWFor" + self._name,
Algorithm=_alg,
RequiredSelections=[
self.DiMuonAndW(), ## fake!
self.W(),
self.DiMuon(),
StdLooseAllPhotons
])
## apply pi0-veto-tagger !
from GaudiConfUtils.ConfigurableGenerators import Pi0Veto__Tagger
_tag = Pi0Veto__Tagger(
MassWindow=25 * MeV,
MassChi2=-1,
ExtraInfoIndex=25013 ## unique !
)
sel = Selection("SelChiAndWFor" + self._name,
Algorithm=_tag,
RequiredSelections=[_sel])
return self._add_selection('ChiW_Selection', sel)
def ChiAndDiMuon ( self ) :
"""
Construct Chi_(c,b) + dumuon line
"""
sel = self._selection ( 'ChiAndDiMuon_Selection' )
if sel : return sel
_alg = CombineParticles (
##
DecayDescriptor = "chi_b2(1P) -> J/psi(1S) J/psi(1S) gamma " ,
##
DaughtersCuts = {
'gamma' : '( PT > 500 * MeV ) & ( CL > 0.05 )'
} ,
## mimic chi_(c,b):
CombinationCut = """
( AM13 - AM1 < 1.05 * GeV ) |
( AM23 - AM2 < 1.05 * GeV )
""" ,
MotherCut = " ALL "
)
_sel = Selection (
"SelPreChiAndDiMuonFor" + self._name ,
Algorithm = _alg ,
RequiredSelections = [ self.DoubleDiMuon () , ##fake!
self.DiMuon () ,
StdLooseAllPhotons ]
)
## apply pi0-veto-tagger !
from GaudiConfUtils.ConfigurableGenerators import Pi0Veto__Tagger
_tag = Pi0Veto__Tagger (
MassWindow = 25 * MeV ,
MassChi2 = -1 ,
ExtraInfoIndex = 25011 ## unique !
)
## the final selection
sel = Selection (
"SelChiAndDiMuonFor" + self._name ,
Algorithm = _tag ,
RequiredSelections = [ _sel ]
)
return self._add_selection ( 'ChiAndDiMuon_Selection' , sel )
def DiChi(self):
"""
Construct 2xChi_(c,b) line
"""
sel = self._selection('DiChi_Selection')
if sel: return sel
_alg = CombineParticles(
##
DecayDescriptor="chi_b2(1P) -> J/psi(1S) J/psi(1S) gamma gamma",
##
DaughtersCuts={'gamma': self['GammaChi']},
## mimic 2xchi_(c,b):
CombinationCut="""
( ( AM13 - AM1 < 1.05 * GeV ) & ( AM24 - AM2 < 1.05 * GeV ) ) |
( ( AM14 - AM1 < 1.05 * GeV ) & ( AM23 - AM2 < 1.05 * GeV ) )
""",
MotherCut=" ALL ")
_sel = Selection(
"SelPreDiChiFor" + self._name,
Algorithm=_alg,
RequiredSelections=[
self.ChiAndDiMuon(), ##fake!
self.DiMuon(),
StdLooseAllPhotons
])
## apply pi0-veto-tagger !
from GaudiConfUtils.ConfigurableGenerators import Pi0Veto__Tagger
_tag = Pi0Veto__Tagger(
MassWindow=25 * MeV,
MassChi2=-1,
ExtraInfoIndex=25012 ## unique !
)
sel = Selection("SelDiChiFor" + self._name,
Algorithm=_tag,
RequiredSelections=[_sel])
return self._add_selection('DiChi_Selection', sel)
