class JVF(JetSystematic):
"""
https://twiki.cern.ch/twiki/bin/view/AtlasProtected/JVFUncertaintyTool
Notes
=====
Assume that all jets are real, hard-scatter jets when applying the JVF
systematic shift.
It have been observed that the JVF is well modelled for hard-scatter jets
in MC while for pile-up jets this is not the case. Much of the JVF mismodelling
is attributed to the overestimation of the pile-up jet multiplicity. Given this
and the fact that the strategy of the JetEtmiss group is to provide support for
real qcd jets, it was decided to assume that all jets are real, hard-scatter
jets when applying the JVF systematic shift. Therefore the function
isPileUpJet() won't be used.
"""
def __init__(self, is_up, JVFcutNominal=0.5, **kwargs):
self.JVFcutNominal = JVFcutNominal
# Tag assumed: JVFUncertaintyTool-00-00-03
self.jvf_tool = JVFUncertaintyTool("AntiKt4LCTopo")
super(JVF, self).__init__(is_up, **kwargs)
@JetSystematic.set
def run(self, jet, event):
# JVF is only used in a certain range, so only correct for those
if jet.pt < 50e3 and abs(jet.constscale_eta) < 2.4:
# Assume that all jets are real, hard-scatter jets when applying
# the JVF systematic shift (2nd arg = False)
jvf_cut_sys = self.jvf_tool.getJVFcut(
self.JVFcutNominal, False,
jet.pt, jet.constscale_eta, self.is_up)
jvf_cut_diff = jvf_cut_sys - self.JVFcutNominal
jet.jvtxf -= jvf_cut_diff
class JVF(JetSystematic):
"""
https://twiki.cern.ch/twiki/bin/view/AtlasProtected/JVFUncertaintyTool
Notes
=====
Assume that all jets are real, hard-scatter jets when applying the JVF
systematic shift.
It have been observed that the JVF is well modelled for hard-scatter jets
in MC while for pile-up jets this is not the case. Much of the JVF mismodelling
is attributed to the overestimation of the pile-up jet multiplicity. Given this
and the fact that the strategy of the JetEtmiss group is to provide support for
real qcd jets, it was decided to assume that all jets are real, hard-scatter
jets when applying the JVF systematic shift. Therefore the function
isPileUpJet() won't be used.
"""
def __init__(self, is_up, JVFcutNominal=0.5, **kwargs):
self.JVFcutNominal = JVFcutNominal
# Tag assumed: JVFUncertaintyTool-00-00-03
self.jvf_tool = JVFUncertaintyTool("AntiKt4LCTopo")
super(JVF, self).__init__(is_up, **kwargs)
@JetSystematic.set
def run(self, jet, event):
# JVF is only used in a certain range, so only correct for those
if jet.pt < 50e3 and abs(jet.constscale_eta) < 2.4:
# Assume that all jets are real, hard-scatter jets when applying
# the JVF systematic shift (2nd arg = False)
jvf_cut_sys = self.jvf_tool.getJVFcut(self.JVFcutNominal, False,
jet.pt, jet.constscale_eta,
self.is_up)
jvf_cut_diff = jvf_cut_sys - self.JVFcutNominal
jet.jvtxf -= jvf_cut_diff
