Weak mode (detector alignment)
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In tracker alignment, weak modes are coherent misalignments that have little effect on the goodness of fit (e.g. χ2) of a track. This makes them difficult (or impossible) to correct for with track-based alignment, which relies on the dependence of the goodness of fit on the detector alignment.
Learn more
John Alison's PhD thesis (2012), see PDF page 12 (document page 53, section 5.2.3)
