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Discard splash events with nVeloCluster GEC

Saverio Mariani requested to merge samarian_nVeloCluster_gec into master

PVz peak @ -100mm was observed with PbPb + SMOG, due to the so-called (already in Run2) splash events. These have very high occupancy in the VELO and cannot be reconstructed/used for physics.

A nVeloCluster cut at 15k (safe wrt central PbPb collisions, see the plot below) is added with MR to prefilter physics trigger lines. GEC was tested against simulation (30-90% centrality) and no difference in trigger lines is observed (see enclosed logs)

Screenshot_from_2023-10-10_11-26-21

output_Allen_nVeloClusterGEC.txt output_Allen_master.txt diff.txt

cc @cagapopo

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