Nuclear interaction, and non-primary TRUTH vertices ( fabs( vertex barcode ) > 200 000 )

uploaded on 23 Sept 2009


J6, J5 and J4 samples. Each 10000 events

  • Fraction of positive charged tracks per vertex plot
    Cuts for this plot is :
    multiplicity > 2 (to reject pure photon conversions)
    eta < 2.5 and transverse distance, R of vertex < 1082 mm ( all vertices are within inner detector )
    NO cuts on multiplicity, vertexmass or child_pT.
    ** J6 dijets (560-1120 GeV) in BLUE entries = 327685
    ** J5 dijets (280-560 GeV) in RED entries = 325746
    ** J4 dijets (140-280 GeV) in BLACK entries = 8523
Ratiobeforecut.gif

Example of vertex (excerpt from event record, 211 = pi+, 2112 = neutron )

Vertex:  -200559 ID:    0 (X,cT)=-1.48e+02,+3.03e+02,+1.31e+03,+1.40e+03
 I: 1       736      211 -2.43e+02,+2.75e+02,+1.49e+03,+1.54e+03   1   -200559
 O:10    2008341000040070 +3.49e+00,-4.79e+01,+3.67e+02,+6.54e+03   1
         200835       22 +1.53e-01,+6.61e-02,+2.12e-02,+1.68e-01   1
         200836     2112 +6.86e+01,-7.08e+01,+3.00e+01,+9.45e+02   1
         200837     2112 -7.90e+00,-1.58e+02,+5.37e+01,+9.54e+02   1
         200838     2112 -1.27e+02,+7.51e+01,-1.33e+02,+9.60e+02   1
         200839     2112 -1.36e+01,-1.73e+02,+2.36e+02,+9.84e+02   1
         200840     2112 -1.76e+02,-6.39e+01,+2.69e+02,+9.95e+02   1
         200841      211 +1.44e+02,+8.08e+01,+4.34e+01,+2.21e+02   1
         200842      211 -1.86e+02,+1.99e+02,+3.06e+02,+4.33e+02   1
         200843      211 +2.14e+02,+5.16e+02,+2.77e+02,+6.39e+02   1

  • Plots with these cuts: multiplicity > 10, vertexmass > 10 GeV, child_pT > 1 GeV
    eta < 2.5 && R < 1082 mm

|Ratioaftercut.gif|multiplicityvsvertexmass.gif
|ratiovsmultiplicity.gif|locationrz.gif|
errata: for R-z plot, J6 = red, J5 = blue, J4 = black


-- ChangWeiLoh - 2009-09-23
Topic attachments
I Attachment History Action Size Date Who Comment
GIFgif Ratioaftercut.gif r1 manage 12.3 K 2009-09-24 - 06:44 Changwei  
GIFgif Ratiobeforecut.gif r1 manage 9.3 K 2009-09-24 - 06:14 Changwei  
GIFgif locationrz.gif r1 manage 16.3 K 2009-09-24 - 08:23 Changwei  
GIFgif multiplicityvsvertexmass.gif r1 manage 8.3 K 2009-09-24 - 07:12 Changwei  
GIFgif ratiovsmultiplicity.gif r1 manage 10.8 K 2009-09-24 - 07:19 Changwei  
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Topic revision: r3 - 2009-09-24 - Changwei
 
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