Recoil Resolution

The width of the peta balance and the pxi balance (where the xi axis is perpendicular to the eta axis) is sensetive to the recoild resolution. We use the same recoil resolution for EC W's as for the CC W events and check that peta balance is in good agreement between data and Monte Carlo for all Z topologies.
peta balance measured using the Z -> ee events of different topologies. The data (solid points) are compared to the Monte Carlo (dashed histogram).
peta balance measured using the Z -> ee events of different topologies. The data (left) and the Monte Carlo (right) distributions are fit with Gaussians.
pxi balance measured using the Z -> ee events of different topologies. The data (solid points) are compared to the Monte Carlo (dashed histogram).
pxi balance measured using the Z -> ee events of different topologies. The data (left) and the Monte Carlo (right) distributions are fit with Gaussians.

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