Spikes in distributions produced by validators

[rtysonCLAS12]

Chris noticed spikes in certain distributions, for example the photon momentum and angles when looking at the photon filter, or in the electron z vertex (but not pion z vertex) when looking at the z vertex filter. See below for examples

We're not sure if these are related or not. The spikes in photon momentum/angles are at 0. Spikes in electron z vertex are at -3, the notional target position. This is only observed for electrons, maybe due to FT reconstruction? (Should check for photons).

Several hypothesis:

• missing banks? What happens if/when a bank is missing?
• neutrals sometimes have 0 momentum, might explain photon spikes?
• the Z vertex might default to the notional position. Is it due to how the zvertex is reconstructed in the FT?

photon momentum and angles (cf https://github.com/JeffersonLab/iguana/pull/216)

e- Z Vertex (cf https://github.com/JeffersonLab/iguana/pull/242)

photon Z Vertex (cf https://github.com/JeffersonLab/iguana/pull/242)

[rtysonCLAS12]

Spikes in ZVertex are due to the fact that there is no z-vertex position from the FT (no tracker). See https://github.com/JeffersonLab/iguana/pull/242#issuecomment-2225122654. and https://github.com/JeffersonLab/iguana/pull/246