Post on 01-Apr-2015
Jet energy correction (Zmumu, 10k)
June 4,2008 Jongseok Lee(Sungkyunkwan University)
1
# of jet
2
red : calojetgreen : genjetpt>15, ΔR(jet,mu)>0.5
Jet energy correction factor
3
PT(calojet)
factor
Matching jet with MC μ
4
ΔR
(gen
jet,
mcm
u)
PT(genjet)/PT(mcmu)
ΔR
(corj
et,
mcm
u)
PT(corjet)/PT(mcmu)
ΔR
(gen
jet,
mcm
u)
ΔR
(corj
et,
mcm
u)
PT(genjet)/PT(mcmu) PT(corjet)/PT(mcmu)
no cut no cut
pt>15 pt>15
nConstituent
5
no corrected nCpt>15
no corrected nCpt>15ΔR(jet,mcmu)>0.5
red : corjet, black : genjet
corrected nCpt>15
corrected nCpt>15ΔR(jet,mcmu)>0.5
Average PT of jet tower
6
corrected nCpt>15
corrected nCpt>15ΔR(jet,mcmu)>0.5
red : corjet, black : genjet
# of jet
7
pt>15, ΔR(jet,mu)>0.5
pt>15
pt>15, nC>=5, ΔR(jet,mu)>0.5
pt>15, nC>=5
red : corjet, black : genjet
PT
8
red : corjet, black : genjet
pt>15, ΔR(jet,mu)>0.5
pt>15
pt>15, nC>=5, ΔR(jet,mu)>0.5
pt>15, nC>=5
η
9
red : corjet, black : genjet
pt>15, ΔR(jet,mu)>0.5
pt>15
pt>15, nC>=5, ΔR(jet,mu)>0.5
pt>15, nC>=5
Jet efficiency (corjet/genjet)
10
pt>15, ΔR(jet,mu)>0.5
pt>15, ΔR(jet,mu)>0.5
pt>15
pt>15
black : pt>15, ΔR(jet,mu)>0.5red : pt>15
black : pt>15, ΔR(jet,mu)>0.5red : pt>15
back up
11
Jet energy correction factor
12
Many reasons why a calorimeter jet energy differs
from anunderlying particle and parton jet energies:
Energy offset due to electronics noise and event pile-up
Energy lost due to energy thresholds applied at cell and
tower level
Energy lost due to particles bent away in 4T magnetic field
Nonlinear HCAL response (e/h < 1)