Changes between Version 16 and Version 17 of WorkBook/PileUp

Timestamp:

Mar 7, 2013, 11:49:48 AM (12 years ago)

Author:

Michele Selvaggi

Comment:

--

WorkBook/PileUp

@@ -32 +32 @@
 
 For estimating pile-up contribution we use the well known fastjet area method, see for instance [http://arxiv.org/abs/0802.1188 arXiv:0802.1188], [http://arxiv.org/abs/0707.1378 arXiv:0707.1378].
-First, the user must specify whether to calculate the area while clustering the jets within the {{{FastJetFinder}}} module . Several methods for the area calculation can also be specified (active area, passive area, Voronoi …) via the parameter {{{AreaAlgorithm}}}. By default this parameter is set to 0 (no area calculation):
+First, the user must specify whether to calculate the area while clustering the jets within the {{{FastJetFinder}}} module. Several methods for the area calculation can be specified (active area, passive area, Voronoi …) via the parameter {{{AreaAlgorithm}}}. By default this parameter is set to 0 (no area calculation):
 
 {{{
@@ -39 +39 @@
 }}} 
 
-Then the median density (in GeV/A) of pile-up contamination (rho) per event can computed by defining the following parameters are defined:
+Then the median density (in GeV/A) of pile-up contamination (rho) per event can the be computed within the {{{FastJetFinder}}} module:
 
 {{{
@@ -46 +46 @@
 }}}
 
+Note that it is common to use one jet algorithm for the rho density calculation (e.g kt with 0.6 cone) and one for the analysis (anti-kt with 0.5). In such a case, in order to be able to perform the pile subtraction (see below), one needs to compute the area also for the analysis jets.  
 
+#k_t
 === Pile-up subtraction ===
 
@@ -86 +88 @@
 }}}
 
-