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Physik-Institut The SHiP experiment at UZH

Timing Detector Studies

Background muons, mostly from backscattering in the environmental hall, can enter the decay vessel and can be reconstructed as fake signals. These combinatorial di-muon background tracks are randomly distributed in time along the whole length of a spill, so an effective rejection of these events would be a coincidence timing requirement. In order to reduce this background to an acceptable level, a dedicated timing detector located
between the spectrometer and calorimeters with a timing resolution of 100 ps or less is required.
Our group is studying one option for such a detector, consisting of rows of plastic scintillating bars, readout on either end by Silicon Photomultipliers. Such a technology has already been shown to resolve signals in the sub 100 ps range. An ongoing effort is under way to optimize the geometry and electronic readout of such a set-up as would be appropriate for SHiP, with initial studies indicating that a resolution down to 50 ps is achievable.

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