We use the fact that the electrons in Z -> ee events are not mono-energetic
to constrain the EM offset in the EC, as was done for the CC analysis [ 3 ]. The offsets for north and south cryostats are consistent with each other and that's why we use only one offset value for both of them.
deltaec measurements obtained
from CC-ECN, CC-ECS, ECN-ECN and ECS-ECS Z -> ee events
respectively, and the combined measurement.
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