| Measuring
Vertex |
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| • | Octagon
detector hits are strongly |
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| peaked
in Z around main vertex (z) |
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| • | Time
difference between the |
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| paddle
counters and ZDCs |
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| • | Spectrometer
tracks extrapolated |
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| to vertex (x,y,z) |
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| • | Combinations
of Vertex hits |
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| resonate
at vertex (y,z) |
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