Event-of-the-Day

Thu 22 May 2003

Photo of the event-of-the-day for Thu 22 May, 2003.

Today's event of the day is one that is one of the larger sources of headaches in event classification. The event has a decay positron which is followed by a beam positron. The beam positron gets enough hits from the decay positron, that it no longer looks like a beam positron if you compare upstream and downstream. As a result the classification sometimes gets confused. I have tried to put in checks for this, and to correct it when I can -- but sometimes these ones slip by and get misclassified. Above is a photo of this busy event, where (in time order) the green clusters are a first muon, the yellow clusters are an upstream decay positron, the pink clusters are a beam positron, the blue clusters are the second muon, and the grey clusters are a downstream decay positron.

The MCTR information for this event is:
 ------ run:   2   event:   675  geant seeds:   235850170  0  ------
 Have   10  MonteCarlo tracks
MCTR: itrack=  1 pid= 65 istop= 0 V=    0.0336   -0.7031 -300.0000 P=    -0.044     0.154    29.787 Q= 1 T=   -27.0 pmag=  29.788 cost=0.999986
MCTR: itrack=  1 pid= 65 istop= 1 V=    1.0992    0.6958    0.0109 P=     0.000     0.000     0.000 Q= 1 T=    14.2 pmag=   0.000 cost=    -NaN
MCTR: itrack=  2 pid= 65 istop= 0 V=   -0.7980    1.0830 -300.0000 P=     0.096     0.037    29.410 Q= 1 T=  3948.0 pmag=  29.410 cost=0.999994
MCTR: itrack=  2 pid= 65 istop= 1 V=   -0.8817    0.0697    0.0132 P=     0.000     0.000     0.000 Q= 1 T=  3989.5 pmag=   0.000 cost=    -NaN
MCTR: itrack=  3 pid=  2 istop= 0 V=    1.3910   -1.3800 -300.0000 P=    -0.005     0.003    29.769 Q= 1 T=  1525.8 pmag=  29.770 cost=1.000000
MCTR: itrack=  3 pid=  2 istop=98 V=    1.9178   -1.3305  150.6726 P=     1.531    -1.589    29.081 Q= 1 T=  1540.9 pmag=  29.164 cost=0.997135
MCTR: itrack=  4 pid=  2 istop= 0 V=    1.0992    0.6958    0.0109 P=   -12.015    22.881   -37.808 Q= 1 T=   985.2 pmag=  45.796 cost=-.825561
MCTR: itrack=  4 pid=  2 istop= 5 V=    0.9387    1.0265  -80.8848 P=    -9.782    22.297   -38.535 Q= 1 T=   988.4 pmag=  45.583 cost=-.845384
MCTR: itrack=  7 pid=  2 istop= 0 V=   -0.8817    0.0697    0.0132 P=   -42.555     0.157    26.213 Q= 1 T=  5870.3 pmag=  49.981 cost=0.524455
MCTR: itrack=  7 pid=  2 istop= 5 V=    3.7092    1.7791   82.3865 P=   -29.726   -26.550    29.693 Q= 1 T=  5875.3 pmag=  49.701 cost=0.597431

The event classification with the help of MC history is:
nMCWindows:   11
 MCWindow=  1  T0=  0.000000  nMu,nDK,nBeame,nDeltas  0  0  0  0  Min,MaxPl=  0  0  Type=  5  (Empty)
 MCWindow=  2  T0=  6.00000  nMu,nDK,nBeame,nDeltas  1  0  0  0  Min,MaxPl=  1  29  Type=  1  (Muon)
 MCWindow=  3  T0=  0.000000  nMu,nDK,nBeame,nDeltas  0  0  0  0  Min,MaxPl=  0  0  Type=  5  (Empty)
 MCWindow=  4  T0=  987.500  nMu,nDK,nBeame,nDeltas  0  1  0  0  Min,MaxPl=  1  29  Type=  2  (UpStream Decay)
 MCWindow=  5  T0=  0.000000  nMu,nDK,nBeame,nDeltas  0  0  0  0  Min,MaxPl=  0  0  Type=  5  (Empty)
 MCWindow=  6  T0=  1538.00  nMu,nDK,nBeame,nDeltas  0  0  1  0  Min,MaxPl=  1  56  Type=  4  (Beam Positron)
 MCWindow=  7  T0=  0.000000  nMu,nDK,nBeame,nDeltas  0  0  0  0  Min,MaxPl=  0  0  Type=  5  (Empty)
 MCWindow=  8  T0=  3982.00  nMu,nDK,nBeame,nDeltas  1  0  0  0  Min,MaxPl=  1  29  Type=  1  (Muon)
 MCWindow=  9  T0=  0.000000  nMu,nDK,nBeame,nDeltas  0  0  0  0  Min,MaxPl=  0  0  Type=  5  (Empty)
 MCWindow=  10  T0=  5872.00  nMu,nDK,nBeame,nDeltas  0  1  0  0  Min,MaxPl=  29  56  Type=  3  (DownStream Decay)
 MCWindow=  11  T0=  0.000000  nMu,nDK,nBeame,nDeltas  0  0  0  0  Min,MaxPl=  0  0  Type=  5  (Empty)
 OVERALL MC EVENT TYPE=  18

The event classification using only TDC information is:
 EventType:   27  (Other)
 Windows:   11
  window  1, T0= -10000., DC window= -10000.    -44., hits PC,DC=   0   0 Min,MaxZ=   99.0  -99.0, type=   5 (Empty)
  window  2, T0=      6., DC window=    -44.    938., hits PC,DC=   6  22 Min,MaxZ=  -59.8   -0.2, type=   1 (Muon)
  window  3, T0=    938., DC window=    938.    938., hits PC,DC=   0   0 Min,MaxZ=   99.0  -99.0, type=   5 (Empty)
  window  4, T0=    988., DC window=    938.   1488., hits PC,DC=   8  31 Min,MaxZ=  -59.8   -0.2, type=   2 (UpStream Decay)
  window  5, T0=   1488., DC window=   1488.   1488., hits PC,DC=  15  49 Min,MaxZ=  -59.8   59.8, type=   5 (Empty)
  window  6, T0=   1538., DC window=   1488.   3038., hits PC,DC=   0   4 Min,MaxZ=  -42.2   34.6, type=   7 (Upstream Decay (DS delta removed))
  window  7, T0=   3038., DC window=   3038.   3932., hits PC,DC=   0   1 Min,MaxZ=  -42.2  -42.2, type=   5 (Empty)
  window  8, T0=   3982., DC window=   3932.   5482., hits PC,DC=   8  25 Min,MaxZ=  -59.8   -0.2, type=   1 (Muon)
  window  9, T0=   5482., DC window=   5482.   5822., hits PC,DC=   0   0 Min,MaxZ=   99.0  -99.0, type=   5 (Empty)
  window 10, T0=   5872., DC window=   5822.   7372., hits PC,DC=  15  44 Min,MaxZ=    0.2   59.8, type=  20 (Dont know)
  window 11, T0=   7372., DC window=   7372.  20000., hits PC,DC=   0   3 Min,MaxZ=  -47.8   -4.6, type=   5 (Empty)

Last modified by Blair Jamieson.