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Adding upstream electrons to di-electron combiners for B2CC, RD and PID

Maarten Van Veghel requested to merge mveghel-dielectronlu into 2024-patches

Adds Upstream electrons to di-electron combiners for B2CC, RD (RK and RKstar lines), boosting efficiency 20-30% (for J/psi at 20%, at low q^2 for e.g. RK it goes up to 30%). Vast majority of added signal is LU (not UU).

With loosened Upstream tracking from !2589 the gains go up to 30% for J/psi (possibly 50% at low q^2 for e.g. RK).

Also fixes bug in jpsi2ee selection (PT < 1 GeV) and moves PT to PT_WITH_BREM for electron candidates.

See slides

Edited by Maarten Van Veghel

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