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Preselection of elastic weak scattering in NOvA Near Detector (docdb 14344v2).

• Pre-selection (Similar to nue FA but much looser):
– L<800 cm, NPlane<120, NCell<600

• Containment:
– Min X > -170 cm
– Max X < 170 cm
– Min Y > -170 cm
– Max Y < 190 cm
– minZ > 75 cm, maxZ < 1250cm

• Single shower:
– Eshower/Etot > 0.9 GeV
– Vertex energy = 0 GeV.
– Gap < 20 cm

• Energy Cut:
– Electron Energy > 0.5 GeV

By Biao Wang (王宸钰)