Difference: ExclusiveJetStudy (11 vs. 12)

Revision 122010-11-22 - MichaelWright

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META TOPICPARENT name="WebHome"

Exclusive Jet Study With Kt, AntiKt and Cambridge Aachen Jet Finders

  • Reference used to calculate bin width with respect to Jet Energy Resoultion (Calculated using dijet sample): Jet_Energy_Resolution.eps
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Kt Jet Finder

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The Kt jet finding algorithm can be broken down into three steps.

1) For each particle i, j in the event the Kt distance is calculated dij = min(P^2ti,P^2tj) ΔR ^2ij / R

Where ΔR ij= (Δetai - Δetaj)^2 + (Δphii - Δphij)^2

The Kt distance from particle i to the beam is also calculated

dij = P^2iB

2) The next step is to find the dmin value for all dij and diB. (Note there are differences between the Inclusive and Exclusive Kt Jet algorithms)

  • INCLUSIVE Kt Jet Algorithm:

If dij is the dmin value then the i, j particles are combined ( the particles four momenta are summed together).

if diB is the dmin value then the particle i is a final jet and the particle i is removed from the list.

  • Exclusive Kt Jet Algorithm:

If dij is the dmin value and is less than dcut then the i, j particles are combined ( the particles four momenta are summed together).

if diB is the dmin value and is less than dcut then the particle i combined with the beam jet.

3)

  • INCLUSIVE Kt Jet Algorithm:

This process is repeated until no more particles are left.

  • Exclusive Kt Jet Algorithm:

This process ends when all dij and diB are above the dcut value

 

Signal and Background Comparisons (Bin Width 100 GeV^2)

Signal and Background Comparisons Not Normalized
Fig1.1 AllDminSigBckKtUnNorm.png
 
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