New production of ntuples for the analysis of $\eta$ and $\eta^\prime$ decays

Generating n-tuples for the analysis of \eta and \eta^\prime decays into \mu \mu and \pi \pi \mu \mu, coming from charm mesons.

The data includes:

• MC for all signal channels in the analysis, corresponding to all three years in Run 2: \eta^\prime \to \mu \mu, \eta \to \mu \mu, \eta^\prime \to \pi \pi \mu \mu, and \eta \to \pi \pi \mu \mu. All coming from D_s^+ or D^+. The full decays are D_s^+ \to \eta \pi^+ and D^+ \to \eta \pi^+, or \eta^\prime.
• Data for all signal channels, separated in two- and four-body channels since the stripping selections are different. In the case of two-body channels, we also include same-sign tuples where the resonance goes to mu+ mu+, and the pion takes a negative sign. This will be used to train the BDT as a proxy for combinatorial background.
• The goals of the analysis are: improve upon the measurements of \eta^\prime \to \pi \pi \mu \mu and \eta \to \mu \mu, improve upon the limit of \eta \to \pi \pi \mu \mu, and look for the first time for \eta^\prime \to \mu μ

The analysis is currently in WG review. This new production includes:

• New MC for \eta^\prime \to \mu \mu
• Implementation for same-sign final states on \eta^\prime \to \mu \mu
• New branches that weren't present before

Previous productions were under the BandQ WG