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ρ is calculated using k_{t} R=0.4 jets reconstructed from locally calibrated (LCW) topoclusters within η<2. The density calculation is with respect to the Voronoi area of the jets as defined  
Changed:  
< <  in [[http://iopscience.iop.org/11266708/2008/04/005][JHEP 0804 (2008) 005]]. Topoclusters are an attempt to reconstruct threedimensional  
> >  in JHEP 0804 (2008) 005. Topoclusters are an attempt to reconstruct threedimensional  
energy deposits in the calorimeter and are built using a nearestneighbor algorithm that clusters calorimeter cells with energy significance (E_{cell}/σ) >4 for the seed, >2 for  
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using informaton derived from test beam and detailed GEANT4 simulatons (EM scale) and σ is the sum in quadrature of the electronic and expected pileup noise, as described in Sec. 10.5.2 of  
Changed:  
< <  [[http://iopscience.iop.org/17480221/3/08/S08003][JINST 3 (2008) S08003]]. Topoclusters can be further calibrated using local  
> >  JINST 3 (2008) S08003. Topoclusters can be further calibrated using local  
information (LCW) as described in  
Changed:  
< <  [[http://www.sciencedirect.com/science/article/pii/S0168900204012884][Nucl. Instrum. Meth. A 531 (2004) 481]]. The pileup noise used in  
> >  Nucl. Instrum. Meth. A 531 (2004) 481. The pileup noise used in  
topoclustering is chosen to match the pileup conditons. Pileup is simulated by overlaying GEANT4 simulated events from PYTHIA (v6.4) including nondiffractive and diffractive events. 
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Added:  
> > 
Information Common To All Plots
ρ is calculated using k_{t} R=0.4 jets reconstructed from locally calibrated (LCW) topoclusters within η<2. The density calculation is with respect to the Voronoi area of the jets as defined in [[http://iopscience.iop.org/11266708/2008/04/005][JHEP 0804 (2008) 005]]. Topoclusters are an attempt to reconstruct threedimensional energy deposits in the calorimeter and are built using a nearestneighbor algorithm that clusters calorimeter cells with energy significance (E_{cell}/σ) >4 for the seed, >2 for neighbors, and >0 at the boundary. E_{cell} is calibrated using informaton derived from test beam and detailed GEANT4 simulatons (EM scale) and σ is the sum in quadrature of the electronic and expected pileup noise, as described in Sec. 10.5.2 of [[http://iopscience.iop.org/17480221/3/08/S08003][JINST 3 (2008) S08003]]. Topoclusters can be further calibrated using local information (LCW) as described in [[http://www.sciencedirect.com/science/article/pii/S0168900204012884][Nucl. Instrum. Meth. A 531 (2004) 481]]. The pileup noise used in topoclustering is chosen to match the pileup conditons. Pileup is simulated by overlaying GEANT4 simulated events from PYTHIA (v6.4) including nondiffractive and diffractive events. Truth jets are built using stable particles from the hardscatter collision excluding muons and neutrinos. A pileupjet is defined as a reconstructed jet that is not closely matched in ΔR to a truth jet. We define a close match as ΔR<0.6, and only truth jets with p_{T} >5 GeV are considered.  
 
Changed:  
< <  Distributions of the LCWscale perevent median p_{T} density ρ (based on topological clusters with η < 2) for four representative values of the reconstructed primary vertex multiplicity N_{PV}. Events with the same number of vertices may have widely varying levels of pileup activity in the calorimeter, as measured by ρ. The use of ρ instead of N_{PV} in the pileup correction therefore results in significantly reduced fluctuations, or improved energy resolution.
 
> > 
The mean pileup jet multiplicity as a function of the number of truth
vertices N_{vtx} in events with an average number of
interactions per bunch crossing (<μ>) of 140. The closed circles (squares) represent the mean number of
pileup jets with p_{T} >20 GeV (solid markers) and 40 GeV
(open markers) before (magenta) and after (blue) pileup subtraction
using the eventbyevent median p_{T} density, ρ.
Pileup subtraction significantly reduces the mean number of pileup jets
per event.
 
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Added:  
> > 

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Added:  
> > 
JetEtmissApproved2013HighMuJets
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