Difference between revisions of "DF Definitions of Tracking Elements"
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=Hits= | =Hits= | ||
| − | " | + | Hits are representations of the locations where a particle flying through the drift chamber layers induces a voltage pulse in a nearby wire. In the image below they are represented by the red hexagons. Note that the fact that the track doesn't intersect the hexagons is due to projecting the 3D data onto a 2D plane. |
| − | + | ||
| + | [[File:DF_DC_Hits.png|600px]] | ||
| + | |||
| + | Below is an example of how Hits are stored in a Hipo file. | ||
| + | |||
| + | <pre style="overflow-x: scroll; overflow-y: scroll; white-space: pre;"> | ||
| + | SHOWING BANK | ||
| + | ------------------------+---------------------------+ | ||
| + | >>>> GROUP (group= 20621) (name=HitBasedTrkg::HBHits): | ||
| + | ------------------------+---------------------------+ | ||
| + | id ( SHORT) : 114 129 125 103 56 54 55 52 53 50 72 73 74 76 90 85 86 83 84 94 92 130 132 133 81 87 134 88 113 122 112 120 111 110 109 108 106 105 98 124 100 101 115 116 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 18 17 20 19 21 23 24 25 26 27 32 34 33 36 35 39 38 41 40 | ||
| + | status ( SHORT) : 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 | ||
| + | sector ( BYTE) : 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 | ||
| + | superlayer ( BYTE) : 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 2 2 2 2 2 2 3 3 3 3 3 3 3 3 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5 | ||
| + | layer ( BYTE) : 1 2 3 5 3 4 4 5 5 6 1 2 2 3 4 5 5 6 6 1 2 2 3 4 5 5 6 6 1 1 2 2 3 3 4 4 5 5 1 2 3 4 4 5 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 5 6 6 1 2 3 4 5 6 2 3 3 4 4 5 5 6 6 | ||
| + | wire ( SHORT) : 40 43 42 40 12 11 12 9 10 9 26 27 28 29 29 28 29 27 28 31 31 32 32 32 31 32 32 33 35 38 36 38 35 36 36 37 37 38 41 42 41 41 42 41 61 61 61 61 61 61 60 61 60 61 60 61 48 48 47 47 46 47 46 47 44 44 43 43 42 42 8 6 7 5 6 3 4 3 4 | ||
| + | TDC ( INT) : 75 27 36 25 13 47 89 28 120 129 78 126 11 28 160 72 17 93 71 154 32 169 114 34 44 99 89 6 76 108 66 119 155 146 122 121 10 89 16 38 13 7 21 21 25 103 65 65 112 20 147 44 94 89 41 144 44 24 92 145 204 274 277 210 149 112 99 78 64 72 147 267 242 418 95 567 11 92 414 | ||
| + | trkDoca ( FLOAT) : -1.0000 -1.0000 -1.0000 -1.0000 0.0731 0.2925 0.5119 0.5119 0.2925 0.0731 1.4833 1.0587 0.3088 2.1009 1.1580 0.2151 1.5826 2.0954 0.7279 0.0055 0.9282 0.4420 0.8785 0.0552 0.9890 0.3812 0.5525 0.8177 1.5174 2.6210 1.0346 1.7244 1.9313 0.5518 1.4485 0.0690 0.4138 1.7933 0.2795 0.4945 0.1290 0.7525 0.6450 0.0215 0.1909 0.4199 0.3054 0.3054 0.4199 0.1909 0.1998 0.4395 0.3197 0.3197 0.4395 0.1998 0.2469 0.0000 0.2469 0.4938 0.7407 1.2345 0.9876 0.9876 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0199 0.5494 1.3383 1.1486 0.7392 1.6781 0.2096 0.3895 1.4983 | ||
| + | docaError ( FLOAT) : 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.1941 0.1941 0.1941 0.1941 0.1941 0.1941 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.3127 0.3127 0.3127 0.3127 0.3127 0.3127 0.3127 0.3127 0.3311 0.3311 0.3311 0.3311 0.3311 0.3311 0.4701 0.4701 0.4701 0.4701 0.4701 0.4701 0.4701 0.4701 0.4701 | ||
| + | LR ( BYTE) : 0 0 0 0 1 1 -1 1 -1 -1 1 1 -1 -1 -1 -1 -1 1 1 -1 1 -1 -1 1 1 -1 1 -1 1 -1 1 -1 1 1 1 1 -1 -1 1 -1 1 1 -1 -1 -1 1 -1 1 -1 1 1 -1 1 -1 1 -1 -1 1 1 1 1 -1 1 -1 -1 -1 -1 -1 -1 -1 1 1 -1 1 -1 1 -1 1 -1 | ||
| + | LocX ( FLOAT) : 1.0000 2.0000 3.0000 5.0000 3.0000 4.0000 4.0000 5.0000 5.0000 6.0000 1.0000 2.0000 2.0000 3.0000 4.0000 5.0000 5.0000 6.0000 6.0000 1.0000 2.0000 2.0000 3.0000 4.0000 5.0000 5.0000 6.0000 6.0000 1.0000 1.0000 2.0000 2.0000 3.0000 3.0000 4.0000 4.0000 5.0000 5.0000 1.0000 2.0000 3.0000 4.0000 4.0000 5.0000 1.0000 2.0000 3.0000 4.0000 5.0000 6.0000 1.0000 2.0000 3.0000 4.0000 5.0000 6.0000 1.0000 2.0000 3.0000 4.0000 5.0000 5.0000 6.0000 6.0000 1.0000 2.0000 3.0000 4.0000 5.0000 6.0000 2.0000 3.0000 3.0000 4.0000 4.0000 5.0000 5.0000 6.0000 6.0000 | ||
| + | LocY ( FLOAT) : 46.7654 49.6521 49.0748 46.7654 14.4338 12.7017 13.8564 10.9697 12.1244 10.3923 30.5996 31.1769 32.3316 34.0637 33.4863 32.9090 34.0637 31.1769 32.3316 36.3731 35.7957 36.9504 37.5278 36.9504 36.3731 37.5278 36.9504 38.1051 40.9919 44.4560 41.5692 43.8786 40.9919 42.1466 41.5692 42.7239 43.3013 44.4560 47.9201 48.4974 47.9201 47.3427 48.4974 47.9201 71.0141 70.4367 71.0141 70.4367 71.0141 70.4367 69.8594 70.4367 69.8594 70.4367 69.8594 70.4367 56.0030 55.4256 54.8483 54.2709 53.6936 54.8483 53.1162 54.2709 51.3842 50.8068 50.2295 49.6521 49.0748 48.4974 9.2376 7.5056 8.6603 5.7735 6.9282 4.0415 5.1962 3.4641 4.6188 | ||
| + | X ( FLOAT) : 0.0000 0.0000 0.0000 0.0000 -71.6639 -73.7759 -72.3679 -75.8878 -74.4799 -76.5918 -51.9523 -51.2483 -49.8404 -47.7284 -48.4324 -49.1364 -47.7284 -51.2483 -49.8404 -44.9125 -45.6164 -44.2085 -43.5045 -44.2085 -44.9125 -43.5045 -44.2085 -42.8005 -39.2806 -35.0567 -38.5766 -35.7606 -39.2806 -37.8726 -38.5766 -37.1686 -36.4646 -35.0567 -30.8327 -30.1287 -30.8327 -31.5367 -30.1287 -30.8327 -1.6736 -2.3461 -1.6736 -2.3461 -1.6736 -2.3461 -4.0813 -3.3773 -4.0813 -3.3773 -4.0813 -3.3773 -24.1981 -25.2812 -26.3643 -27.4474 -28.5305 -26.3643 -29.6136 -27.4474 -34.9155 -36.0625 -37.2095 -38.3565 -39.5035 -40.6506 -158.4696 -163.2955 -160.0383 -168.2414 -164.9842 -173.0673 -169.8101 -174.7560 -171.4987 | ||
| + | Z ( FLOAT) : 0.0000 0.0000 0.0000 0.0000 242.3253 243.5380 243.5380 244.7507 244.7507 245.9633 239.9000 241.1127 241.1127 242.3253 243.5380 244.7507 244.7507 245.9633 245.9633 239.9000 241.1127 241.1127 242.3253 243.5380 244.7507 244.7507 245.9633 245.9633 239.9000 239.9000 241.1127 241.1127 242.3253 242.3253 243.5380 243.5380 244.7507 244.7507 239.9000 241.1127 242.3253 243.5380 243.5380 244.7507 229.2365 230.3950 231.5534 232.7119 233.8704 235.0289 239.9000 241.1127 242.3253 243.5380 244.7507 245.9633 353.4097 355.2754 357.1411 359.0069 360.8726 360.8726 362.7383 362.7383 373.7406 375.7163 377.6921 379.6679 381.6437 383.6195 494.7098 497.5153 497.5153 500.3207 500.3207 503.1261 503.1261 505.9315 505.9315 | ||
| + | B ( FLOAT) : 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 | ||
| + | TProp ( FLOAT) : 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 | ||
| + | TFlight ( FLOAT) : 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 | ||
| + | clusterID ( SHORT) : -1 -1 -1 -1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 6 6 6 6 6 6 7 7 7 7 7 7 8 8 8 8 8 8 8 8 9 9 9 9 9 9 10 10 10 10 10 10 10 10 10 | ||
| + | trkID ( BYTE) : -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 | ||
| + | ------------------------+---------------------------+ | ||
| + | </pre> | ||
| + | |||
| + | =Clusters= | ||
| + | Clusters are collections of hits that are near to one another. In the image below, all of the hits would be included in the cluster. The red one is culled from the group when making the segment for this cluster. | ||
| + | |||
| + | [[File:DF_DC_Clusters.png|600px]] | ||
| + | |||
| + | Below is an example of how Clusters are stored in a Hipo file. | ||
| + | |||
| + | <pre style="overflow-x: scroll; overflow-y: scroll; white-space: pre;"> | ||
| + | SHOWING BANK | ||
| + | ------------------------+---------------------------+ | ||
| + | >>>> GROUP (group= 20622) (name=HitBasedTrkg::HBClusters): | ||
| + | ------------------------+---------------------------+ | ||
| + | id ( SHORT) : 1 2 3 4 5 6 7 8 | ||
| + | status ( SHORT) : 0 1 0 0 0 0 0 0 | ||
| + | sector ( BYTE) : 2 2 5 5 5 5 5 5 | ||
| + | superlayer ( BYTE) : 1 2 1 2 3 4 5 6 | ||
| + | Hit1_ID ( SHORT) : 1 11 35 43 50 56 63 70 | ||
| + | Hit2_ID ( SHORT) : 2 13 34 42 49 57 65 71 | ||
| + | Hit3_ID ( SHORT) : 3 14 36 44 51 59 64 72 | ||
| + | Hit4_ID ( SHORT) : 4 15 37 45 52 58 66 73 | ||
| + | Hit5_ID ( SHORT) : 6 16 39 46 53 60 67 75 | ||
| + | Hit6_ID ( SHORT) : 7 -1 38 47 54 61 68 74 | ||
| + | Hit7_ID ( SHORT) : -1 -1 40 48 55 62 69 76 | ||
| + | Hit8_ID ( SHORT) : -1 -1 41 -1 -1 -1 -1 -1 | ||
| + | Hit9_ID ( SHORT) : -1 -1 -1 -1 -1 -1 -1 -1 | ||
| + | Hit10_ID ( SHORT) : -1 -1 -1 -1 -1 -1 -1 -1 | ||
| + | Hit11_ID ( SHORT) : -1 -1 -1 -1 -1 -1 -1 -1 | ||
| + | Hit12_ID ( SHORT) : -1 -1 -1 -1 -1 -1 -1 -1 | ||
| + | avgWire ( FLOAT) : 68.6667 77.4000 33.3750 37.4286 29.2857 31.5714 21.8571 23.1429 | ||
| + | fitChisqProb ( FLOAT) : 0.0000 0.0036 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 | ||
| + | fitSlope ( FLOAT) : 0.0166 0.2322 -0.2100 -0.1887 -0.2322 -0.2996 -0.3680 -0.3680 | ||
| + | fitSlopeErr ( FLOAT) : 0.0403 0.0533 0.0348 0.0352 0.0352 0.0400 0.0382 0.0382 | ||
| + | fitInterc ( FLOAT) : 4.4520 -36.5574 9.5149 9.5899 17.7931 49.5027 70.7928 79.1137 | ||
| + | fitIntercErr ( FLOAT) : 9.3509 12.9777 8.0593 8.5474 12.5977 15.1560 19.0513 19.9619 | ||
| + | size ( BYTE) : 6 5 8 7 7 7 7 7 | ||
| + | ------------------------+---------------------------+ | ||
| + | </pre> | ||
| + | |||
=Segments= | =Segments= | ||
| + | Segments are collections of hits in a single superlayer which have had "bad" hits culled from them. Additionally, a segment also represents a line segment (surprise!) which is a linear approximation of the path of the particle through the superlayer. In the image below, the two segments are represented by the two collections of yellow hexagons. On the left segment you can see the circles which represent the distance of closest approach (doca) of the particle to the wire. The right segment lacks these as there wasn't enough information to answer the left-right ambiguity. Also notice that on the left the line segment is approximately tangential to all of the doca circles. | ||
| + | |||
| + | [[File:DF_DC_Segments.png|600px]] | ||
| + | |||
| + | Below is an example of how Segments are stored in a Hipo file. | ||
| + | |||
| + | <pre style="overflow-x: scroll; overflow-y: scroll; white-space: pre;"> | ||
| + | SHOWING BANK | ||
| + | ------------------------+---------------------------+ | ||
| + | >>>> GROUP (group= 20623) (name=HitBasedTrkg::HBSegments): | ||
| + | ------------------------+---------------------------+ | ||
| + | id ( SHORT) : 1 3 5 6 7 8 9 10 | ||
| + | status ( SHORT) : 0 0 0 0 0 0 0 0 | ||
| + | sector ( BYTE) : 1 1 1 3 3 3 3 3 | ||
| + | superlayer ( BYTE) : 2 2 2 1 2 3 4 5 | ||
| + | Cluster_ID ( SHORT) : 1 3 5 6 7 8 9 10 | ||
| + | Hit1_ID ( SHORT) : 56 94 98 1 7 13 21 32 | ||
| + | Hit2_ID ( SHORT) : 54 92 124 2 8 14 23 34 | ||
| + | Hit3_ID ( SHORT) : 55 130 100 3 9 15 24 33 | ||
| + | Hit4_ID ( SHORT) : 52 132 101 4 10 16 25 36 | ||
| + | Hit5_ID ( SHORT) : 53 133 115 5 11 18 26 35 | ||
| + | Hit6_ID ( SHORT) : 50 81 116 6 12 17 27 39 | ||
| + | Hit7_ID ( SHORT) : -1 87 -1 -1 -1 20 -1 38 | ||
| + | Hit8_ID ( SHORT) : -1 134 -1 -1 -1 19 -1 41 | ||
| + | Hit9_ID ( SHORT) : -1 88 -1 -1 -1 -1 -1 40 | ||
| + | Hit10_ID ( SHORT) : -1 -1 -1 -1 -1 -1 -1 -1 | ||
| + | Hit11_ID ( SHORT) : -1 -1 -1 -1 -1 -1 -1 -1 | ||
| + | Hit12_ID ( SHORT) : -1 -1 -1 -1 -1 -1 -1 -1 | ||
| + | avgWire ( FLOAT) : 10.5000 31.7778 41.3333 61.0000 60.5000 47.0000 43.0000 5.1111 | ||
| + | fitChisqProb ( FLOAT) : 0.0019 0.0000 0.0000 0.0027 0.0027 0.0000 1.0000 0.0000 | ||
| + | fitSlope ( FLOAT) : -1.4249 0.2107 -0.0625 -0.0498 0.0498 -0.4354 -0.5805 -1.3945 | ||
| + | fitSlopeErr ( FLOAT) : 0.0719 0.0321 0.0512 0.0403 0.0403 0.0344 0.0403 0.0427 | ||
| + | fitInterc ( FLOAT) : 273.7628 -95.4594 -15.5529 9.5410 -15.8175 129.4050 182.0523 531.4352 | ||
| + | fitIntercErr ( FLOAT) : 17.5424 7.8094 12.4168 9.3509 9.7859 12.3491 15.2542 21.4032 | ||
| + | SegEndPoint1X ( FLOAT) : 39.6847 60.6765 73.6974 95.1886 97.8695 127.1811 126.3054 67.8422 | ||
| + | SegEndPoint1Z ( FLOAT) : 246.1951 236.4065 230.3347 208.5473 219.0631 330.6389 353.4799 511.1211 | ||
| + | SegEndPoint2X ( FLOAT) : 34.4168 64.3967 75.9163 97.3753 100.7054 127.4424 125.2827 56.0423 | ||
| + | SegEndPoint2Z ( FLOAT) : 255.3417 241.3618 235.9901 213.9188 224.4308 340.8101 364.8570 532.1007 | ||
| + | size ( BYTE) : 6 9 6 6 6 8 6 9 | ||
| + | ------------------------+---------------------------+ | ||
| + | </pre> | ||
| + | |||
=Crosses= | =Crosses= | ||
| + | Crosses represent a point in space between two superlayers and an associated direction vector. The point is found by taking the average of two points on the midplane between the two superlayers. Those two points are defined by the intersection of the midplane with the lines defined by the Segments. The direction vector is more complicated and can be understood by studying the code below. | ||
| + | |||
| + | <pre> | ||
| + | double z = DcDetector.getRegionMidpoint(this.get_Region() - 1).z; | ||
| + | |||
| + | double wy_over_wx = (Math.cos(Math.toRadians(6.)) / Math.sin(Math.toRadians(6.))); | ||
| + | double val_sl1 = this._seg1.get_fittedCluster().get_clusterLineFitSlope(); | ||
| + | double val_sl2 = this._seg2.get_fittedCluster().get_clusterLineFitSlope(); | ||
| + | double val_it1 = this._seg1.get_fittedCluster().get_clusterLineFitIntercept(); | ||
| + | double val_it2 = this._seg2.get_fittedCluster().get_clusterLineFitIntercept(); | ||
| + | |||
| + | double x = 0.5 * (val_it1 + val_it2) + 0.5 * z * (val_sl1 + val_sl2); | ||
| + | double y = 0.5 * wy_over_wx * (val_it2 - val_it1) + 0.5 * wy_over_wx * z * (val_sl2 - val_sl1); | ||
| + | |||
| + | this.set_Point(new Point3D(x, y, z)); | ||
| + | |||
| + | double tanThX = val_sl2; | ||
| + | double tanThY = FastMath.atan2(y, z); | ||
| + | double uz = 1. / Math.sqrt(1 + tanThX * tanThX + tanThY * tanThY); | ||
| + | double ux = uz * tanThX; | ||
| + | double uy = uz * tanThY; | ||
| + | |||
| + | Point3D dirVec = new Point3D(ux, uy, uz); | ||
| + | this.set_Dir(dirVec); | ||
| + | </pre> | ||
| + | |||
| + | The image below shows the cross from the image above. | ||
| + | |||
| + | [[File:DF_DC_Crosses.png|600px]] | ||
| + | |||
| + | Below is an example of how Crosses are stored in a Hipo file. | ||
| + | |||
| + | <pre style="overflow-x: scroll; overflow-y: scroll; white-space: pre;"> | ||
| + | SHOWING BANK | ||
| + | ------------------------+---------------------------+ | ||
| + | >>>> GROUP (group= 20625) (name=HitBasedTrkg::HBCrosses): | ||
| + | ------------------------+---------------------------+ | ||
| + | id ( SHORT) : 1 2 3 4 5 | ||
| + | status ( SHORT) : 0 0 0 0 0 | ||
| + | sector ( BYTE) : 3 3 3 6 6 | ||
| + | region ( BYTE) : 1 2 3 1 1 | ||
| + | x ( FLOAT) : -0.3618 -11.9840 -56.9372 -68.7670 -65.6416 | ||
| + | y ( FLOAT) : 32.3521 55.8878 59.5648 7.2446 -22.4919 | ||
| + | z ( FLOAT) : 237.4644 368.2394 510.0512 237.4644 237.4644 | ||
| + | err_x ( FLOAT) : 0.1643 0.2976 0.3015 0.1788 0.2135 | ||
| + | err_y ( FLOAT) : 1.5629 2.8317 2.8681 1.7015 2.0310 | ||
| + | err_z ( FLOAT) : 0.0000 0.0000 0.0000 0.0000 0.0000 | ||
| + | ux ( FLOAT) : 0.0492 -0.2238 -0.4260 0.2261 0.2252 | ||
| + | uy ( FLOAT) : 0.1340 0.1452 0.1045 0.0297 -0.0916 | ||
| + | uz ( FLOAT) : 0.9898 0.9638 0.8987 0.9737 0.9700 | ||
| + | err_ux ( FLOAT) : 0.0401 0.0361 0.0529 0.0273 0.0404 | ||
| + | err_uy ( FLOAT) : 0.3828 0.3286 0.2649 0.2079 0.2514 | ||
| + | err_uz ( FLOAT) : 0.0014 0.0518 0.0726 0.0908 0.1186 | ||
| + | Segment1_ID ( SHORT) : 1 3 5 7 8 | ||
| + | Segment2_ID ( SHORT) : 2 4 6 10 10 | ||
| + | ------------------------+---------------------------+ | ||
| + | </pre> | ||
| + | |||
=Tracks= | =Tracks= | ||
| + | Tracks represent the culmination of the entire reconstruction chain. Importantly, they include the reconstructed interaction vertex, momentum at that vertex, and the charge of the particle. They also contain some basic information about the crosses from which the interaction vertex was reconstructed and some statistical data about the fit. | ||
| + | |||
| + | [[File:DF_DC_Tracks.png|600px]] | ||
| + | |||
| + | Below is an example of how Tracks are stored in a Hipo file. | ||
| + | |||
| + | <pre style="overflow-x: scroll; overflow-y: scroll; white-space: pre;"> | ||
| + | SHOWING BANK | ||
| + | ------------------------+---------------------------+ | ||
| + | >>>> GROUP (group= 20626) (name=HitBasedTrkg::HBTracks): | ||
| + | ------------------------+---------------------------+ | ||
| + | id ( SHORT) : 1 | ||
| + | status ( SHORT) : 100 | ||
| + | sector ( BYTE) : 3 | ||
| + | c1_x ( FLOAT) : -128.5109 | ||
| + | c1_y ( FLOAT) : 115.4666 | ||
| + | c1_z ( FLOAT) : 506.9086 | ||
| + | c1_ux ( FLOAT) : 0.0032 | ||
| + | c1_uy ( FLOAT) : -0.0799 | ||
| + | c1_uz ( FLOAT) : -0.9968 | ||
| + | c3_x ( FLOAT) : -128.7847 | ||
| + | c3_y ( FLOAT) : 120.8905 | ||
| + | c3_z ( FLOAT) : 574.3513 | ||
| + | c3_ux ( FLOAT) : -0.0045 | ||
| + | c3_uy ( FLOAT) : 0.0802 | ||
| + | c3_uz ( FLOAT) : 0.9968 | ||
| + | t1_x ( FLOAT) : -57.5850 | ||
| + | t1_y ( FLOAT) : 45.6473 | ||
| + | t1_z ( FLOAT) : 166.7499 | ||
| + | t1_px ( FLOAT) : -0.3076 | ||
| + | t1_py ( FLOAT) : 0.2565 | ||
| + | t1_pz ( FLOAT) : 0.7588 | ||
| + | Vtx0_x ( FLOAT) : -2.2362 | ||
| + | Vtx0_y ( FLOAT) : -1.3091 | ||
| + | Vtx0_z ( FLOAT) : 28.8956 | ||
| + | p0_x ( FLOAT) : -0.1872 | ||
| + | p0_y ( FLOAT) : 0.3537 | ||
| + | p0_z ( FLOAT) : 0.7590 | ||
| + | Cross1_ID ( SHORT) : 1 | ||
| + | Cross2_ID ( SHORT) : 2 | ||
| + | Cross3_ID ( SHORT) : 3 | ||
| + | q ( BYTE) : -1 | ||
| + | pathlength ( FLOAT) : 583.9297 | ||
| + | chi2 ( FLOAT) : 9557.5850 | ||
| + | ndf ( SHORT) : 27 | ||
| + | ------------------------+---------------------------+ | ||
| + | </pre> | ||
| + | |||
| + | =Trajectories= | ||
| + | |||
| + | |||
| + | Below is an example of how Trajectories are stored in a Hipo file. | ||
| + | |||
| + | <pre style="overflow-x: scroll; overflow-y: scroll; white-space: pre;"> | ||
| + | SHOWING BANK | ||
| + | ------------------------+---------------------------+ | ||
| + | >>>> GROUP (group= 20653) (name=TimeBasedTrkg::Trajectory): | ||
| + | ------------------------+---------------------------+ | ||
| + | tid ( SHORT) : 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 | ||
| + | did ( SHORT) : 0 1 2 3 4 5 6 12 18 24 30 36 42 43 45 46 47 48 0 | ||
| + | x ( FLOAT) : -9.9529 -3.7311 -3.7962 -3.8596 -3.9212 -3.9789 -4.0374 -13.2187 -13.7865 -18.8099 -19.4285 -22.3313 -22.9000 -25.2570 -26.2660 -26.6888 -27.0723 -27.9423 0.0000 | ||
| + | y ( FLOAT) : -50.6146 -11.4803 -11.8263 -12.1727 -12.5193 -12.8522 -13.1992 -68.0507 -71.0887 -100.0908 -103.8051 -117.5637 -119.6376 -128.3220 -132.0461 -133.6067 -135.0220 -138.2330 0.0000 | ||
| + | z ( FLOAT) : 167.2291 30.3110 31.5104 32.7099 33.9094 35.0609 36.2604 228.7963 239.5100 355.4784 376.8500 505.6019 529.8580 631.0645 674.4456 692.6249 709.1107 746.5151 0.0000 | ||
| + | tx ( FLOAT) : -0.0506 -0.0528 -0.0514 -0.0500 -0.0487 -0.0474 -0.0462 -0.0510 -0.0508 -0.0305 -0.0266 -0.0234 -0.0233 -0.0232 -0.0232 -0.0232 -0.0232 -0.0232 0.0000 | ||
| + | ty ( FLOAT) : -0.2722 -0.2767 -0.2769 -0.2772 -0.2774 -0.2775 -0.2777 -0.2723 -0.2726 -0.1825 -0.1599 -0.0850 -0.0853 -0.0855 -0.0855 -0.0855 -0.0855 -0.0855 0.0000 | ||
| + | tz ( FLOAT) : 0.9609 0.9595 0.9595 0.9595 0.9595 0.9595 0.9596 0.9609 0.9608 0.9827 0.9868 0.9961 0.9961 0.9961 0.9961 0.9961 0.9961 0.9961 0.0000 | ||
| + | B ( FLOAT) : 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 | ||
| + | L ( FLOAT) : 185.6421 43.1024 44.3525 45.6025 46.8526 48.0527 49.3027 249.7139 260.8645 380.5711 402.2723 531.8295 556.1809 657.7866 701.3390 719.5900 736.1409 773.6930 0.0000 | ||
| + | ------------------------+---------------------------+ | ||
| + | </pre> | ||
| − | + | =Main Page= | |
| + | [[User:Friadavi]] | ||
Latest revision as of 01:03, 7 March 2019
Hits
Hits are representations of the locations where a particle flying through the drift chamber layers induces a voltage pulse in a nearby wire. In the image below they are represented by the red hexagons. Note that the fact that the track doesn't intersect the hexagons is due to projecting the 3D data onto a 2D plane.
Below is an example of how Hits are stored in a Hipo file.
SHOWING BANK
------------------------+---------------------------+
>>>> GROUP (group= 20621) (name=HitBasedTrkg::HBHits):
------------------------+---------------------------+
id ( SHORT) : 114 129 125 103 56 54 55 52 53 50 72 73 74 76 90 85 86 83 84 94 92 130 132 133 81 87 134 88 113 122 112 120 111 110 109 108 106 105 98 124 100 101 115 116 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 18 17 20 19 21 23 24 25 26 27 32 34 33 36 35 39 38 41 40
status ( SHORT) : 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
sector ( BYTE) : 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
superlayer ( BYTE) : 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 2 2 2 2 2 2 3 3 3 3 3 3 3 3 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5
layer ( BYTE) : 1 2 3 5 3 4 4 5 5 6 1 2 2 3 4 5 5 6 6 1 2 2 3 4 5 5 6 6 1 1 2 2 3 3 4 4 5 5 1 2 3 4 4 5 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 5 6 6 1 2 3 4 5 6 2 3 3 4 4 5 5 6 6
wire ( SHORT) : 40 43 42 40 12 11 12 9 10 9 26 27 28 29 29 28 29 27 28 31 31 32 32 32 31 32 32 33 35 38 36 38 35 36 36 37 37 38 41 42 41 41 42 41 61 61 61 61 61 61 60 61 60 61 60 61 48 48 47 47 46 47 46 47 44 44 43 43 42 42 8 6 7 5 6 3 4 3 4
TDC ( INT) : 75 27 36 25 13 47 89 28 120 129 78 126 11 28 160 72 17 93 71 154 32 169 114 34 44 99 89 6 76 108 66 119 155 146 122 121 10 89 16 38 13 7 21 21 25 103 65 65 112 20 147 44 94 89 41 144 44 24 92 145 204 274 277 210 149 112 99 78 64 72 147 267 242 418 95 567 11 92 414
trkDoca ( FLOAT) : -1.0000 -1.0000 -1.0000 -1.0000 0.0731 0.2925 0.5119 0.5119 0.2925 0.0731 1.4833 1.0587 0.3088 2.1009 1.1580 0.2151 1.5826 2.0954 0.7279 0.0055 0.9282 0.4420 0.8785 0.0552 0.9890 0.3812 0.5525 0.8177 1.5174 2.6210 1.0346 1.7244 1.9313 0.5518 1.4485 0.0690 0.4138 1.7933 0.2795 0.4945 0.1290 0.7525 0.6450 0.0215 0.1909 0.4199 0.3054 0.3054 0.4199 0.1909 0.1998 0.4395 0.3197 0.3197 0.4395 0.1998 0.2469 0.0000 0.2469 0.4938 0.7407 1.2345 0.9876 0.9876 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0199 0.5494 1.3383 1.1486 0.7392 1.6781 0.2096 0.3895 1.4983
docaError ( FLOAT) : 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.1941 0.1941 0.1941 0.1941 0.1941 0.1941 0.2032 0.2032 0.2032 0.2032 0.2032 0.2032 0.3127 0.3127 0.3127 0.3127 0.3127 0.3127 0.3127 0.3127 0.3311 0.3311 0.3311 0.3311 0.3311 0.3311 0.4701 0.4701 0.4701 0.4701 0.4701 0.4701 0.4701 0.4701 0.4701
LR ( BYTE) : 0 0 0 0 1 1 -1 1 -1 -1 1 1 -1 -1 -1 -1 -1 1 1 -1 1 -1 -1 1 1 -1 1 -1 1 -1 1 -1 1 1 1 1 -1 -1 1 -1 1 1 -1 -1 -1 1 -1 1 -1 1 1 -1 1 -1 1 -1 -1 1 1 1 1 -1 1 -1 -1 -1 -1 -1 -1 -1 1 1 -1 1 -1 1 -1 1 -1
LocX ( FLOAT) : 1.0000 2.0000 3.0000 5.0000 3.0000 4.0000 4.0000 5.0000 5.0000 6.0000 1.0000 2.0000 2.0000 3.0000 4.0000 5.0000 5.0000 6.0000 6.0000 1.0000 2.0000 2.0000 3.0000 4.0000 5.0000 5.0000 6.0000 6.0000 1.0000 1.0000 2.0000 2.0000 3.0000 3.0000 4.0000 4.0000 5.0000 5.0000 1.0000 2.0000 3.0000 4.0000 4.0000 5.0000 1.0000 2.0000 3.0000 4.0000 5.0000 6.0000 1.0000 2.0000 3.0000 4.0000 5.0000 6.0000 1.0000 2.0000 3.0000 4.0000 5.0000 5.0000 6.0000 6.0000 1.0000 2.0000 3.0000 4.0000 5.0000 6.0000 2.0000 3.0000 3.0000 4.0000 4.0000 5.0000 5.0000 6.0000 6.0000
LocY ( FLOAT) : 46.7654 49.6521 49.0748 46.7654 14.4338 12.7017 13.8564 10.9697 12.1244 10.3923 30.5996 31.1769 32.3316 34.0637 33.4863 32.9090 34.0637 31.1769 32.3316 36.3731 35.7957 36.9504 37.5278 36.9504 36.3731 37.5278 36.9504 38.1051 40.9919 44.4560 41.5692 43.8786 40.9919 42.1466 41.5692 42.7239 43.3013 44.4560 47.9201 48.4974 47.9201 47.3427 48.4974 47.9201 71.0141 70.4367 71.0141 70.4367 71.0141 70.4367 69.8594 70.4367 69.8594 70.4367 69.8594 70.4367 56.0030 55.4256 54.8483 54.2709 53.6936 54.8483 53.1162 54.2709 51.3842 50.8068 50.2295 49.6521 49.0748 48.4974 9.2376 7.5056 8.6603 5.7735 6.9282 4.0415 5.1962 3.4641 4.6188
X ( FLOAT) : 0.0000 0.0000 0.0000 0.0000 -71.6639 -73.7759 -72.3679 -75.8878 -74.4799 -76.5918 -51.9523 -51.2483 -49.8404 -47.7284 -48.4324 -49.1364 -47.7284 -51.2483 -49.8404 -44.9125 -45.6164 -44.2085 -43.5045 -44.2085 -44.9125 -43.5045 -44.2085 -42.8005 -39.2806 -35.0567 -38.5766 -35.7606 -39.2806 -37.8726 -38.5766 -37.1686 -36.4646 -35.0567 -30.8327 -30.1287 -30.8327 -31.5367 -30.1287 -30.8327 -1.6736 -2.3461 -1.6736 -2.3461 -1.6736 -2.3461 -4.0813 -3.3773 -4.0813 -3.3773 -4.0813 -3.3773 -24.1981 -25.2812 -26.3643 -27.4474 -28.5305 -26.3643 -29.6136 -27.4474 -34.9155 -36.0625 -37.2095 -38.3565 -39.5035 -40.6506 -158.4696 -163.2955 -160.0383 -168.2414 -164.9842 -173.0673 -169.8101 -174.7560 -171.4987
Z ( FLOAT) : 0.0000 0.0000 0.0000 0.0000 242.3253 243.5380 243.5380 244.7507 244.7507 245.9633 239.9000 241.1127 241.1127 242.3253 243.5380 244.7507 244.7507 245.9633 245.9633 239.9000 241.1127 241.1127 242.3253 243.5380 244.7507 244.7507 245.9633 245.9633 239.9000 239.9000 241.1127 241.1127 242.3253 242.3253 243.5380 243.5380 244.7507 244.7507 239.9000 241.1127 242.3253 243.5380 243.5380 244.7507 229.2365 230.3950 231.5534 232.7119 233.8704 235.0289 239.9000 241.1127 242.3253 243.5380 244.7507 245.9633 353.4097 355.2754 357.1411 359.0069 360.8726 360.8726 362.7383 362.7383 373.7406 375.7163 377.6921 379.6679 381.6437 383.6195 494.7098 497.5153 497.5153 500.3207 500.3207 503.1261 503.1261 505.9315 505.9315
B ( FLOAT) : 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
TProp ( FLOAT) : 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
TFlight ( FLOAT) : 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
clusterID ( SHORT) : -1 -1 -1 -1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 6 6 6 6 6 6 7 7 7 7 7 7 8 8 8 8 8 8 8 8 9 9 9 9 9 9 10 10 10 10 10 10 10 10 10
trkID ( BYTE) : -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
------------------------+---------------------------+
Clusters
Clusters are collections of hits that are near to one another. In the image below, all of the hits would be included in the cluster. The red one is culled from the group when making the segment for this cluster.
Below is an example of how Clusters are stored in a Hipo file.
SHOWING BANK
------------------------+---------------------------+
>>>> GROUP (group= 20622) (name=HitBasedTrkg::HBClusters):
------------------------+---------------------------+
id ( SHORT) : 1 2 3 4 5 6 7 8
status ( SHORT) : 0 1 0 0 0 0 0 0
sector ( BYTE) : 2 2 5 5 5 5 5 5
superlayer ( BYTE) : 1 2 1 2 3 4 5 6
Hit1_ID ( SHORT) : 1 11 35 43 50 56 63 70
Hit2_ID ( SHORT) : 2 13 34 42 49 57 65 71
Hit3_ID ( SHORT) : 3 14 36 44 51 59 64 72
Hit4_ID ( SHORT) : 4 15 37 45 52 58 66 73
Hit5_ID ( SHORT) : 6 16 39 46 53 60 67 75
Hit6_ID ( SHORT) : 7 -1 38 47 54 61 68 74
Hit7_ID ( SHORT) : -1 -1 40 48 55 62 69 76
Hit8_ID ( SHORT) : -1 -1 41 -1 -1 -1 -1 -1
Hit9_ID ( SHORT) : -1 -1 -1 -1 -1 -1 -1 -1
Hit10_ID ( SHORT) : -1 -1 -1 -1 -1 -1 -1 -1
Hit11_ID ( SHORT) : -1 -1 -1 -1 -1 -1 -1 -1
Hit12_ID ( SHORT) : -1 -1 -1 -1 -1 -1 -1 -1
avgWire ( FLOAT) : 68.6667 77.4000 33.3750 37.4286 29.2857 31.5714 21.8571 23.1429
fitChisqProb ( FLOAT) : 0.0000 0.0036 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
fitSlope ( FLOAT) : 0.0166 0.2322 -0.2100 -0.1887 -0.2322 -0.2996 -0.3680 -0.3680
fitSlopeErr ( FLOAT) : 0.0403 0.0533 0.0348 0.0352 0.0352 0.0400 0.0382 0.0382
fitInterc ( FLOAT) : 4.4520 -36.5574 9.5149 9.5899 17.7931 49.5027 70.7928 79.1137
fitIntercErr ( FLOAT) : 9.3509 12.9777 8.0593 8.5474 12.5977 15.1560 19.0513 19.9619
size ( BYTE) : 6 5 8 7 7 7 7 7
------------------------+---------------------------+
Segments
Segments are collections of hits in a single superlayer which have had "bad" hits culled from them. Additionally, a segment also represents a line segment (surprise!) which is a linear approximation of the path of the particle through the superlayer. In the image below, the two segments are represented by the two collections of yellow hexagons. On the left segment you can see the circles which represent the distance of closest approach (doca) of the particle to the wire. The right segment lacks these as there wasn't enough information to answer the left-right ambiguity. Also notice that on the left the line segment is approximately tangential to all of the doca circles.
Below is an example of how Segments are stored in a Hipo file.
SHOWING BANK
------------------------+---------------------------+
>>>> GROUP (group= 20623) (name=HitBasedTrkg::HBSegments):
------------------------+---------------------------+
id ( SHORT) : 1 3 5 6 7 8 9 10
status ( SHORT) : 0 0 0 0 0 0 0 0
sector ( BYTE) : 1 1 1 3 3 3 3 3
superlayer ( BYTE) : 2 2 2 1 2 3 4 5
Cluster_ID ( SHORT) : 1 3 5 6 7 8 9 10
Hit1_ID ( SHORT) : 56 94 98 1 7 13 21 32
Hit2_ID ( SHORT) : 54 92 124 2 8 14 23 34
Hit3_ID ( SHORT) : 55 130 100 3 9 15 24 33
Hit4_ID ( SHORT) : 52 132 101 4 10 16 25 36
Hit5_ID ( SHORT) : 53 133 115 5 11 18 26 35
Hit6_ID ( SHORT) : 50 81 116 6 12 17 27 39
Hit7_ID ( SHORT) : -1 87 -1 -1 -1 20 -1 38
Hit8_ID ( SHORT) : -1 134 -1 -1 -1 19 -1 41
Hit9_ID ( SHORT) : -1 88 -1 -1 -1 -1 -1 40
Hit10_ID ( SHORT) : -1 -1 -1 -1 -1 -1 -1 -1
Hit11_ID ( SHORT) : -1 -1 -1 -1 -1 -1 -1 -1
Hit12_ID ( SHORT) : -1 -1 -1 -1 -1 -1 -1 -1
avgWire ( FLOAT) : 10.5000 31.7778 41.3333 61.0000 60.5000 47.0000 43.0000 5.1111
fitChisqProb ( FLOAT) : 0.0019 0.0000 0.0000 0.0027 0.0027 0.0000 1.0000 0.0000
fitSlope ( FLOAT) : -1.4249 0.2107 -0.0625 -0.0498 0.0498 -0.4354 -0.5805 -1.3945
fitSlopeErr ( FLOAT) : 0.0719 0.0321 0.0512 0.0403 0.0403 0.0344 0.0403 0.0427
fitInterc ( FLOAT) : 273.7628 -95.4594 -15.5529 9.5410 -15.8175 129.4050 182.0523 531.4352
fitIntercErr ( FLOAT) : 17.5424 7.8094 12.4168 9.3509 9.7859 12.3491 15.2542 21.4032
SegEndPoint1X ( FLOAT) : 39.6847 60.6765 73.6974 95.1886 97.8695 127.1811 126.3054 67.8422
SegEndPoint1Z ( FLOAT) : 246.1951 236.4065 230.3347 208.5473 219.0631 330.6389 353.4799 511.1211
SegEndPoint2X ( FLOAT) : 34.4168 64.3967 75.9163 97.3753 100.7054 127.4424 125.2827 56.0423
SegEndPoint2Z ( FLOAT) : 255.3417 241.3618 235.9901 213.9188 224.4308 340.8101 364.8570 532.1007
size ( BYTE) : 6 9 6 6 6 8 6 9
------------------------+---------------------------+
Crosses
Crosses represent a point in space between two superlayers and an associated direction vector. The point is found by taking the average of two points on the midplane between the two superlayers. Those two points are defined by the intersection of the midplane with the lines defined by the Segments. The direction vector is more complicated and can be understood by studying the code below.
double z = DcDetector.getRegionMidpoint(this.get_Region() - 1).z;
double wy_over_wx = (Math.cos(Math.toRadians(6.)) / Math.sin(Math.toRadians(6.)));
double val_sl1 = this._seg1.get_fittedCluster().get_clusterLineFitSlope();
double val_sl2 = this._seg2.get_fittedCluster().get_clusterLineFitSlope();
double val_it1 = this._seg1.get_fittedCluster().get_clusterLineFitIntercept();
double val_it2 = this._seg2.get_fittedCluster().get_clusterLineFitIntercept();
double x = 0.5 * (val_it1 + val_it2) + 0.5 * z * (val_sl1 + val_sl2);
double y = 0.5 * wy_over_wx * (val_it2 - val_it1) + 0.5 * wy_over_wx * z * (val_sl2 - val_sl1);
this.set_Point(new Point3D(x, y, z));
double tanThX = val_sl2;
double tanThY = FastMath.atan2(y, z);
double uz = 1. / Math.sqrt(1 + tanThX * tanThX + tanThY * tanThY);
double ux = uz * tanThX;
double uy = uz * tanThY;
Point3D dirVec = new Point3D(ux, uy, uz);
this.set_Dir(dirVec);
The image below shows the cross from the image above.
Below is an example of how Crosses are stored in a Hipo file.
SHOWING BANK
------------------------+---------------------------+
>>>> GROUP (group= 20625) (name=HitBasedTrkg::HBCrosses):
------------------------+---------------------------+
id ( SHORT) : 1 2 3 4 5
status ( SHORT) : 0 0 0 0 0
sector ( BYTE) : 3 3 3 6 6
region ( BYTE) : 1 2 3 1 1
x ( FLOAT) : -0.3618 -11.9840 -56.9372 -68.7670 -65.6416
y ( FLOAT) : 32.3521 55.8878 59.5648 7.2446 -22.4919
z ( FLOAT) : 237.4644 368.2394 510.0512 237.4644 237.4644
err_x ( FLOAT) : 0.1643 0.2976 0.3015 0.1788 0.2135
err_y ( FLOAT) : 1.5629 2.8317 2.8681 1.7015 2.0310
err_z ( FLOAT) : 0.0000 0.0000 0.0000 0.0000 0.0000
ux ( FLOAT) : 0.0492 -0.2238 -0.4260 0.2261 0.2252
uy ( FLOAT) : 0.1340 0.1452 0.1045 0.0297 -0.0916
uz ( FLOAT) : 0.9898 0.9638 0.8987 0.9737 0.9700
err_ux ( FLOAT) : 0.0401 0.0361 0.0529 0.0273 0.0404
err_uy ( FLOAT) : 0.3828 0.3286 0.2649 0.2079 0.2514
err_uz ( FLOAT) : 0.0014 0.0518 0.0726 0.0908 0.1186
Segment1_ID ( SHORT) : 1 3 5 7 8
Segment2_ID ( SHORT) : 2 4 6 10 10
------------------------+---------------------------+
Tracks
Tracks represent the culmination of the entire reconstruction chain. Importantly, they include the reconstructed interaction vertex, momentum at that vertex, and the charge of the particle. They also contain some basic information about the crosses from which the interaction vertex was reconstructed and some statistical data about the fit.
Below is an example of how Tracks are stored in a Hipo file.
SHOWING BANK
------------------------+---------------------------+
>>>> GROUP (group= 20626) (name=HitBasedTrkg::HBTracks):
------------------------+---------------------------+
id ( SHORT) : 1
status ( SHORT) : 100
sector ( BYTE) : 3
c1_x ( FLOAT) : -128.5109
c1_y ( FLOAT) : 115.4666
c1_z ( FLOAT) : 506.9086
c1_ux ( FLOAT) : 0.0032
c1_uy ( FLOAT) : -0.0799
c1_uz ( FLOAT) : -0.9968
c3_x ( FLOAT) : -128.7847
c3_y ( FLOAT) : 120.8905
c3_z ( FLOAT) : 574.3513
c3_ux ( FLOAT) : -0.0045
c3_uy ( FLOAT) : 0.0802
c3_uz ( FLOAT) : 0.9968
t1_x ( FLOAT) : -57.5850
t1_y ( FLOAT) : 45.6473
t1_z ( FLOAT) : 166.7499
t1_px ( FLOAT) : -0.3076
t1_py ( FLOAT) : 0.2565
t1_pz ( FLOAT) : 0.7588
Vtx0_x ( FLOAT) : -2.2362
Vtx0_y ( FLOAT) : -1.3091
Vtx0_z ( FLOAT) : 28.8956
p0_x ( FLOAT) : -0.1872
p0_y ( FLOAT) : 0.3537
p0_z ( FLOAT) : 0.7590
Cross1_ID ( SHORT) : 1
Cross2_ID ( SHORT) : 2
Cross3_ID ( SHORT) : 3
q ( BYTE) : -1
pathlength ( FLOAT) : 583.9297
chi2 ( FLOAT) : 9557.5850
ndf ( SHORT) : 27
------------------------+---------------------------+
Trajectories
Below is an example of how Trajectories are stored in a Hipo file.
SHOWING BANK
------------------------+---------------------------+
>>>> GROUP (group= 20653) (name=TimeBasedTrkg::Trajectory):
------------------------+---------------------------+
tid ( SHORT) : 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0
did ( SHORT) : 0 1 2 3 4 5 6 12 18 24 30 36 42 43 45 46 47 48 0
x ( FLOAT) : -9.9529 -3.7311 -3.7962 -3.8596 -3.9212 -3.9789 -4.0374 -13.2187 -13.7865 -18.8099 -19.4285 -22.3313 -22.9000 -25.2570 -26.2660 -26.6888 -27.0723 -27.9423 0.0000
y ( FLOAT) : -50.6146 -11.4803 -11.8263 -12.1727 -12.5193 -12.8522 -13.1992 -68.0507 -71.0887 -100.0908 -103.8051 -117.5637 -119.6376 -128.3220 -132.0461 -133.6067 -135.0220 -138.2330 0.0000
z ( FLOAT) : 167.2291 30.3110 31.5104 32.7099 33.9094 35.0609 36.2604 228.7963 239.5100 355.4784 376.8500 505.6019 529.8580 631.0645 674.4456 692.6249 709.1107 746.5151 0.0000
tx ( FLOAT) : -0.0506 -0.0528 -0.0514 -0.0500 -0.0487 -0.0474 -0.0462 -0.0510 -0.0508 -0.0305 -0.0266 -0.0234 -0.0233 -0.0232 -0.0232 -0.0232 -0.0232 -0.0232 0.0000
ty ( FLOAT) : -0.2722 -0.2767 -0.2769 -0.2772 -0.2774 -0.2775 -0.2777 -0.2723 -0.2726 -0.1825 -0.1599 -0.0850 -0.0853 -0.0855 -0.0855 -0.0855 -0.0855 -0.0855 0.0000
tz ( FLOAT) : 0.9609 0.9595 0.9595 0.9595 0.9595 0.9595 0.9596 0.9609 0.9608 0.9827 0.9868 0.9961 0.9961 0.9961 0.9961 0.9961 0.9961 0.9961 0.0000
B ( FLOAT) : 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
L ( FLOAT) : 185.6421 43.1024 44.3525 45.6025 46.8526 48.0527 49.3027 249.7139 260.8645 380.5711 402.2723 531.8295 556.1809 657.7866 701.3390 719.5900 736.1409 773.6930 0.0000
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