Difference: LowPtVertices (1 vs. 4)

Revision 42006-11-14 - FerencSikler

Line: 1 to 1
	Vertices with low p_T tracks Dijet Event gallery Minimum bias Event gallery Vertex resolution Multiple vertices Standard parameters Lowering PtMin to 0 Even looser Even looser
Line: 9 to 9

Added:
> >	Event gallery EventGalleryDijet
	Minimum bias Minimum bias Pythia p+p events at 14 TeV. Generated, simulated and reconstructed with CMSSW_1_2_0_pre1 with special code for low p_T reconstruction.
Added:
> >	Event gallery EventGallery
	Vertex resolution Distribution of vertex residuals with the standard setting (PtMin=1GeV/c) and the low p_T setting (PtMin=0).

Revision 32006-11-13 - FerencSikler

Line: 1 to 1

Changed:

<
<

Vertices with low p_T tracks

Minimum bias Pythia p+p events at 14 TeV. Generated, simulated and reconstructed with CMSSW_1_2_0_pre1 with special code for low p_T reconstruction.

>
>

Vertices with low p_T tracks

Added:

>
>

Dijet

Two jet Pythia events (produced with PythiaZ700dijets.cfi). Generated, simulated and reconstructed with CMSSW_1_2_0_pre1 with special code for low p_T reconstruction. The distribution of number of found vertices (NVertices) with several NTrkMin settings, keeping ZSeparation=0.05cm and PtMin=0. While with NTrkMin=5 there are a lot of events with multiple vertices, with NTrkMin=10 their frequency is below 1%.

Minimum bias

Minimum bias Pythia p+p events at 14 TeV. Generated, simulated and reconstructed with CMSSW_1_2_0_pre1 with special code for low p_T reconstruction.

Vertex resolution

Distribution of vertex residuals with the standard setting (PtMin=1GeV/c) and the low p_T setting (PtMin=0).

Line: 40 to 48

META FILEATTACHMENT	attr="h" autoattached="1" comment="" date="1163358659" name="vertices.png" path="vertices.png" size="6651" user="Main.FerencSikler" version="1"
META FILEATTACHMENT	attr="h" autoattached="1" comment="" date="1163358918" name="resolution.png" path="resolution.png" size="4461" user="Main.FerencSikler" version="1"
META FILEATTACHMENT	attr="h" autoattached="1" comment="" date="1163358738" name="vertices_b.png" path="vertices_b.png" size="5988" user="Main.FerencSikler" version="1"

Added:

>
>

META FILEATTACHMENT	attr="h" autoattached="1" comment="" date="1163449055" name="dijet.png" path="dijet.png" size="4218" user="Main.FerencSikler" version="1"

META FILEATTACHMENT	attr="h" autoattached="1" comment="" date="1163358685" name="vertices_a.png" path="vertices_a.png" size="6711" user="Main.FerencSikler" version="1"
META FILEATTACHMENT	attr="h" autoattached="1" comment="" date="1163358646" name="multidep.png" path="multidep.png" size="6480" user="Main.FerencSikler" version="2"
META FILEATTACHMENT	attr="h" autoattached="1" comment="" date="1163358698" name="vertices_c.png" path="vertices_c.png" size="5898" user="Main.FerencSikler" version="1"

Revision 22006-11-12 - FerencSikler

-<
<
+ Vertices with low p_T tracks
->
>
+ Vertices with low p_T tracks
-<
<
+Vertices with low pT tracks
Minimum bias Pythia p+p events at 14 TeV . Generated, simulated and reconstructed with CMSSW_1_2_0_pre1.
->
>
+Minimum bias Pythia p+p events at 14 TeV. Generated, simulated and reconstructed with CMSSW_1_2_0_pre1 with special code for low p_T reconstruction.
-<
<
+Vertex resolution
Distribution of vertex residuals with the standard setting (PtMin =1GeV/c) and the low pT setting (PtMin =0).
->
>
+ Dijet 
 Event gallery
 
  Minimum bias 
 Event gallery
  Vertex resolution
  Multiple vertices 
 Standard parameters
  Lowering PtMin to 0
  Even looser
  Even looser
-<
<
+The resolution has strong multiplicity dependence, shown here as function reconstructed track multiplicity NRecTracks .
->
>
+ Vertex resolution 
Distribution of vertex residuals with the standard setting (PtMin=1GeV/c) and the low p_T setting (PtMin=0).
-<
<
+Multiple vertices
Distribution of the number of reconstructed (charged pixel) tracks for several NVertices values is shown, that is for different number of found vertices. The following four plots are done with different vertex reconstruction parameters in RecoPixelVertexing /PixelVertexFinding/data/PixelVertexes.cff (ZSeparation, NTrkMin , PtMin ).
->
>
-<
<
+    * Standard parameters:
      Only high multiplicity events give vertex.
->
>
+The resolution has strong multiplicity dependence, shown here as function reconstructed track multiplicity NRecTracks.
-<
<
+    * Lowering PtMin  to 0:
      Now all tracks take part in vertex finding. Even low multiplicity events give a vertex, if, say, NRecTracks  > 8.
->
>
-<
<
+    * Even looser:
      Lowering NTrkMin  to 2. This choice gives vertex to very low multiplicity events, but at the same time many events will have multiple vertices.
->
>
+ Multiple vertices
-<
<
+    * Even looser:
      Increasing ZSeparation to 0.5 cm. A possible cure of the previous problem.
->
>
+Distribution of the number of reconstructed (charged pixel) tracks for several NVertices values is shown, that is for different number of found vertices. The following four plots are done with different vertex reconstruction parameters in RecoPixelVertexing/PixelVertexFinding/data/PixelVertexes.cff (ZSeparation, NTrkMin, PtMin).

 Standard parameters 
      Only high multiplicity events give vertex. 
 
      

 Lowering PtMin to 0 
      Now all tracks take part in vertex finding. Even low multiplicity events give a vertex, if, say, NRecTracks > 8. 
 
      

 Even looser 
      Lowering NTrkMin to 2. This choice gives vertex to very low multiplicity events, but at the same time many events will have multiple vertices. 
 
      

 Even looser 
      Increasing ZSeparation to 0.5 cm. A possible cure of the previous problem.
 -- FerencSikler - 12 Nov 2006
-<
<
+ META FILEATTACHMENT 
 attachment="vertices.png" attr="h" comment="" date="1163353531" name="vertices.png" path="vertices.png" size="6651" stream="vertices.png" user="Main.FerencSikler" version="1"
- META FILEATTACHMENT
+ attachment="vertices.png" attr="h" comment="" date="1163353531" name="vertices.png" path="vertices.png" size="6651" stream="vertices.png" user="Main.FerencSikler" version="1"
->
>
+ META FILEATTACHMENT 
 attr="h" autoattached="1" comment="" date="1163358659" name="vertices.png" path="vertices.png" size="6651" user="Main.FerencSikler" version="1" 


 META FILEATTACHMENT 
 attr="h" autoattached="1" comment="" date="1163358918" name="resolution.png" path="resolution.png" size="4461" user="Main.FerencSikler" version="1" 


 META FILEATTACHMENT 
 attr="h" autoattached="1" comment="" date="1163358738" name="vertices_b.png" path="vertices_b.png" size="5988" user="Main.FerencSikler" version="1" 


 META FILEATTACHMENT 
 attr="h" autoattached="1" comment="" date="1163358685" name="vertices_a.png" path="vertices_a.png" size="6711" user="Main.FerencSikler" version="1" 


 META FILEATTACHMENT 
 attr="h" autoattached="1" comment="" date="1163358646" name="multidep.png" path="multidep.png" size="6480" user="Main.FerencSikler" version="2" 


 META FILEATTACHMENT 
 attr="h" autoattached="1" comment="" date="1163358698" name="vertices_c.png" path="vertices_c.png" size="5898" user="Main.FerencSikler" version="1"
- META FILEATTACHMENT
+ attr="h" autoattached="1" comment="" date="1163358659" name="vertices.png" path="vertices.png" size="6651" user="Main.FerencSikler" version="1"
- META FILEATTACHMENT
+ attr="h" autoattached="1" comment="" date="1163358918" name="resolution.png" path="resolution.png" size="4461" user="Main.FerencSikler" version="1"
- META FILEATTACHMENT
+ attr="h" autoattached="1" comment="" date="1163358738" name="vertices_b.png" path="vertices_b.png" size="5988" user="Main.FerencSikler" version="1"
- META FILEATTACHMENT
+ attr="h" autoattached="1" comment="" date="1163358685" name="vertices_a.png" path="vertices_a.png" size="6711" user="Main.FerencSikler" version="1"
- META FILEATTACHMENT
+ attr="h" autoattached="1" comment="" date="1163358646" name="multidep.png" path="multidep.png" size="6480" user="Main.FerencSikler" version="2"
- META FILEATTACHMENT
+ attr="h" autoattached="1" comment="" date="1163358698" name="vertices_c.png" path="vertices_c.png" size="5898" user="Main.FerencSikler" version="1"

Revision 12006-11-12 - FerencSikler

Line: 1 to 1

Added:

>
>

Vertices with low p_T tracks

Vertices with low pT tracks Minimum bias Pythia p+p events at 14 TeV . Generated, simulated and reconstructed with CMSSW_1_2_0_pre1.

Vertex resolution Distribution of vertex residuals with the standard setting (PtMin =1GeV/c) and the low pT setting (PtMin =0).

The resolution has strong multiplicity dependence, shown here as function reconstructed track multiplicity NRecTracks .

Multiple vertices Distribution of the number of reconstructed (charged pixel) tracks for several NVertices values is shown, that is for different number of found vertices. The following four plots are done with different vertex reconstruction parameters in RecoPixelVertexing /PixelVertexFinding/data/PixelVertexes.cff (ZSeparation, NTrkMin , PtMin ).

* Standard parameters: Only high multiplicity events give vertex.

* Lowering PtMin to 0: Now all tracks take part in vertex finding. Even low multiplicity events give a vertex, if, say, NRecTracks > 8.

* Even looser: Lowering NTrkMin to 2. This choice gives vertex to very low multiplicity events, but at the same time many events will have multiple vertices.

* Even looser: Increasing ZSeparation to 0.5 cm. A possible cure of the previous problem.

-- FerencSikler - 12 Nov 2006

META FILEATTACHMENT	attachment="vertices.png" attr="h" comment="" date="1163353531" name="vertices.png" path="vertices.png" size="6651" stream="vertices.png" user="Main.FerencSikler" version="1"

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