What are Stubbs in the CMS Tracker?

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  • Thread starter Thread starter Silviu
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SUMMARY

Stubs in the CMS (Compact Muon Solenoid) detector refer to short tracks formed by hits in at least four different tracker layers. They are crucial for primary vertex finding tasks in particle collision experiments. Unlike calorimeters, which measure energy accumulation, stubs are defined by the presence of hits in the tracking layers of the detector, indicating particle trajectories. Understanding stubs is essential for interpreting data from the CMS tracking system.

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Silviu
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Hello! I am reading some stuff about the tracker of a detector in a particle collider and I am not sure I know what stubs are. They appear without any definition: "To be used for the primary vertex finding task, the resulting tracks must have stubs in at least four different tracker layers". I didn't really find a definition online. From this sentence I guess a stub is like an accumulation of energy in certain cells inside a layer of a tracker (those cells form the stub) but I am not totally sure. Can someone clarify this? (I am reading about the CMS detector) Thank you!
 
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A stub is a short track.
 
Accumulation of energy is something you'll find in a calorimeter, not a tracker.
The CMS tracking detector has several layers where both sides are instrumented, so you can look for places in the detector where both sides had a hit at the same place.
 

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