Fig 14 - uploaded by Horst D Wahl
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Data flow through the TFC. Dotted lines indicate data paths; solid lines, control paths. Boxes represent logic functions and the boxes with dotted lines indicate specific Altera 10k100 FPGAs.
Source publication
Many physics topics to be studied by the D0 experiment during Run II of the Fermilab Tevatron ppbar collider give rise to final states containing b--flavored particles. Examples include Higgs searches, top quark production and decay studies, and full reconstruction of B decays. The sensitivity to such modes has been significantly enhanced by the in...
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Citations
... Clusters from SMT hits are associated to tracks from L1CTT; the STT then fits the SMT hits to a track by minimizing a χ 2 function in b, κ, and φ . [4]. ...
... Dataflow through the STT. The Level 3 data paths have been omitted [4] then ...
... As we saw in equation 1.1, the resolution σ b is of the order 40 µm, meaning a significance cut of 3 would pick out tracks with an impact parameter of at least 120 µm at that resolution. For comparison, simulated tracks from b-quarks in ZH → ννbb events showed an average impact parameter of 80 µm [4]. By requiring an STT track in the trigger, one can enhance the b-jet content of the sample while avoiding the use of other topological variables involving the jets that lower the trigger efficiency. ...
... In some triggers one simply requires an STT track without regard to fit quality or impact parameter. In this case the idea is to use the siliconFigure 10: Left: Efficiency for a good STT track to be matched to a good RECO track as a function of the STT track fit χ 2 [4] in Z → µ µ events. Right: Efficiency for a good STT track to be matched to a good RECO track as a function of the STT track fit in multijet events. ...
... As we saw in equation 1.1, the resolution σ b is of the order 40 µm, meaning a significance cut of 3 would pick out tracks with an impact parameter of at least 120 µm at that resolution. For comparison, simulated tracks from b-quarks in ZH → ννb ¯ b events showed an average impact parameter of 80 µm[4]. By requiring an STT track in the trigger, one can enhance the b-jet content of the sample while avoiding the use of other topological variables involving the jets that lower the trigger efficiency. ...
The Silicon Track Trigger is a dedicated preprocessor within the Level 2 trigger system of the D0 detector. It is designed to provide fast pattern recognition using inputs from the central tracking detectors to search for high-impact parameter tracks. Triggering on high-impact parameter tracks enhances the heavy-quark content of the data, benefiting Higgs searches, Top physics, and b-physics.
... The L2 Silicon Track Trigger (STT) is a new L2 trigger system [48]. It is designed to utilize the SMT hit information so that better triggers on charged particle tracks can be obtained at earlier trigger stage than L3. ...
This paper describes the mechanical design, the readout chain, the
production, testing and the installation of the Silicon Microstrip Tracker of
the D0 experiment at the Fermilab Tevatron collider. In addition, description
of the performance of the detector during the experiment data collection
between 2001 and 2010 is provided.
