Difference between revisions of "DF Definitions of Tracking Elements"

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An extension of Hit.java which is meant to be used in fitted clusters, this includes additional information:
 
An extension of Hit.java which is meant to be used in fitted clusters, this includes additional information:
 
{| class="wikitable" style="text-align: left;"
 
{| class="wikitable" style="text-align: left;"
|X
+
|X||X at Z in local coordinate system
 
|-
 
|-
|XMP
+
|XMP||X at the midplane in the sector coordinate system
 
|-
 
|-
|Z
+
|Z||Z in the Sector Coordinate System
 
|-
 
|-
|lX
+
|lX||X in the local coordinate system; used in hit-based fit to cluster.
 
|-
 
|-
|lY
+
|lY||Y in the local coordinate system; used in hit-based fit to cluster.
 
|-
 
|-
|Residual
+
|Residual||Cluster line to the wire position residual
 
|-
 
|-
|Time Residual
+
|Time Residual||Cluster line to wire position time residual
 
|-
 
|-
|Left-Right Ambiguity
+
|Left-Right Ambiguity|| Gives a value to handle the left-right ambiguity: -1 => y-fit < 0 to the left of the wire=> <code>y=y-lr*TimeToDistance</code>
 
|-
 
|-
|Quality Fac
+
|Quality Fac||
 
|-
 
|-
|Tracking Status
+
|Tracking Status||
 
|-
 
|-
|Cluster Fit DoCA
+
|Cluster Fit DoCA||
 
|-
 
|-
|Track Fit DoCA
+
|Track Fit DoCA||
 
|-
 
|-
|Time to Distance
+
|Time to Distance||
 
|-
 
|-
|Beta
+
|Beta||
 
|-
 
|-
|Associated State Vector
+
|Associated State Vector||
 
|-
 
|-
|DoCA
+
|DoCA||
 
|-
 
|-
|B
+
|B||
 
|-
 
|-
|lr
+
|lr||
 
|-
 
|-
|Associated Cluster ID
+
|Associated Cluster ID||
 
|-
 
|-
|Remove Flag
+
|Remove Flag||
 
|-
 
|-
|Associated HB Track ID
+
|Associated HB Track ID||
 
|-
 
|-
|Associated TB Track ID
+
|Associated TB Track ID||
 
|-
 
|-
|CrossDirIntersWire
+
|CrossDirIntersWire||
 
|-
 
|-
|SignalPropagAlongWire
+
|SignalPropagAlongWire||
 
|-
 
|-
|SignalPropagTimeAlongWire
+
|SignalPropagTimeAlongWire||
 
|-
 
|-
|T0
+
|T0||
 
|-
 
|-
|tFlight
+
|tFlight||
 
|-
 
|-
|tProp
+
|tProp||
 
|-
 
|-
|tStart
+
|tStart||
 
|-
 
|-
|Time
+
|Time||
 
|}
 
|}
 
=Clusters=
 
=Clusters=

Revision as of 20:33, 24 May 2018

Below are definitions of the structures used in the clas12 dc reconstructions.

Hits

Hit.java

The basic building block of the other structures used in the reconstruction, Hits are simply a representation of a drift chamber wire interaction. It stores all of the relevant information for identifying a wire:

Sector Which of the six radial sectors the hit is in.
DF Test Image.png
Superlayer Which of the six superlayers the hit is in.
Layer Which of the six wire plane layers within the superlayer the hit is in.
Wire The wire within the layer the hit is in.
TDC The Time-to-Digital Converter which processed the hit

And some information about the interaction itself:

ID The hit index in the Evio column.
Cell Size The size of the wire cell. The wires are arranged in hexagonal cells, but different layers have different sizes of hexagons.
DF Test Image.png
DoCA Error Uncertainty in the distance of closest approach time.

It should be noted that this implements the Comparable interface; that is to say the the function compareTo() has been implemented such that hits can be absolutely ordered. The ordering appears to be exactly as you would expect: Sector > SuperLayer > Layer > Wire. This allows you to call the built in sort function of ArrayLists of Hits (such as Clusters).

FittedHit.java

An extension of Hit.java which is meant to be used in fitted clusters, this includes additional information:

X X at Z in local coordinate system
XMP X at the midplane in the sector coordinate system
Z Z in the Sector Coordinate System
lX X in the local coordinate system; used in hit-based fit to cluster.
lY Y in the local coordinate system; used in hit-based fit to cluster.
Residual Cluster line to the wire position residual
Time Residual Cluster line to wire position time residual
Left-Right Ambiguity Gives a value to handle the left-right ambiguity: -1 => y-fit < 0 to the left of the wire=> y=y-lr*TimeToDistance
Quality Fac
Tracking Status
Cluster Fit DoCA
Track Fit DoCA
Time to Distance
Beta
Associated State Vector
DoCA
B
lr
Associated Cluster ID
Remove Flag
Associated HB Track ID
Associated TB Track ID
CrossDirIntersWire
SignalPropagAlongWire
SignalPropagTimeAlongWire
T0
tFlight
tProp
tStart
Time

Clusters

Segments

Crosses

Tracks