As is the case in lwtnn-2.11.1.

Gabriel Facini authored 4 years ago and Vakhtang Tsulaia committed 4 years ago

Tracks passing a selection designed to identify photon conversions were
given a shortcut through the ambi for a small efficiency gain. This had
the unwanted side-effect of allowing electron brem tracks (mostly in the
forward direction) to have incorrect hits and overshare IBL hits
lowering the EM LH identification rate.

Simple fix - remove short cut
Impact on digest - 3 tracks over 3 events

These are renamed versions of the lwtnn classes, prefixed with 'Fast' and in
the 'lwt::atlas::' namespace, but otherwise identical. Next step: make them
not identical.