[PWGLF] Change Generated Event selection in NucleiSpectra.cxx

[Cristian-Moscatelli]

I modified the selection criteria for generated events (MC collisions) in the task NucleiSpectra.cxx (PWGLF/TableProducer/Nuspex). Previously, no selections were applied to generated events. I applied the following requirements:

1. TVXtrigger: the MC collision must satisfy the TVX trigger condition. This is reproduced by requiring at least two particles within the pseudorapidity region covered by the FT0A and FT0C detectors.
2. Z vertex: the collision must have |z_vertex| < 10 cm.
3. INEL>0: the MC collision must satisfy the INEL > 0 condition. This requirement is applied only when the corresponding configurable (lines 236, 252) is active.

Additionally, I replaced the hardcoded triggerList (line 459) with a configurable parameter (line 339). The default value (fHe) is left unvaried.

[Cristian-Moscatelli]

I remain at disposal for any further refinement of the code, to improve the evaluation of the signal and event loss

[mpuccio]

Dear @Cristian-Moscatelli,
I think what would be best here is to track the selections in a bit mask that we can store in the gen particles. See the comments below for a few more details.

[Cristian-Moscatelli]

Thank you for your comment. I will work to refine the task including your suggestions

[alibuild]

Error while checking build/O2Physics/o2 for 45987a4 at 2026-02-25 19:49:

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