[PWGLF] Update on Xi1820 Analysis and add the Armenteros-Qt, Alpha info. on the ResoV0s table

[mjkim525]

This update includes a V0 table update and minor fixes in the resonance initializer, as well as an analysis code update in xi1820analysis.cxx.

----- Resonance initializer -----
• Added Armenteros–Podolanski variables (qT and α) to the ResoV0 table.
• Removed the INFO log message that was printed while constructing the Reso-MCV0s and Cascades tables.

----- xi1820analysis.cxx -----
• Added the acceptance × efficiency evaluation block.
Charged kaon cuts
• Applied pT-dependent DCAxy and DCAz cuts.

Lambda cuts
• Added a K0S mass rejection cut.
• Added an Armenteros–Podolanski cut.

K0S cuts
• Made the Λ mass rejection cut configurable.
• Added an Armenteros–Podolanski cut.

Charged K + Λ channel analysis
• Added a guard to skip track-level analysis when either track table has fewer than 2 entries.
• Added a rapidity cut for reconstructed Ξ(1820) candidates, with a configurable parameter.
• Added the MC-reco part needed to compute acceptance × efficiency.
• Fixed a bug in the event-mixing pool construction.

K0S + Λ channel analysis
• Added a guard to skip V0-level analysis when the V0 track table has fewer than 2 entries.
• Added a check to skip combinations where the K0S candidate index is the same as the Λ candidate index.
• Added the MC-reco part needed to compute acceptance × efficiency.
• Fixed a bug in the event-mixing pool construction.

[BongHwi]

Hello @mjkim525 , thanks for the contribution.

The update on the resonance framework looks minimum and reasonable.

(We all know that the additonal variables in the table of the V0, Cascades are almost negligible in terms of dervied dataset size due to its smallers yields then the primary tracks)

Regarding the Xi(1820) analysis taks, thanks for the finalisation. I think we can go as it is.

Since it includes the modification of the table producer, we need an approval from the LF Conveners. @omvazque @mpuccio

Cheers,
Bong-Hwi