Draft: Sprucing lines for partially reconstructed sexaquark searches

Re-implementation of (https://gitlab.cern.ch/lhcb/Stripping/-/blob/2018-patches/Phys/StrippingSelections/python/StrippingSelections/StrippingBandQ/StrippingSexaquark.py)[Sexaquark stripping] for 2025 sprucing

Looking for b-baryons to an antiproton, a meson and missing 4-momentum carrying two units of strangeness and 2 units of baryon number (labelled S below). The missing momentum can be recovered by kinematical constraints from tagging an excited baryon.

The final states are \bar{p} D_s^+, \bar{p} \bar{D}^0, \bar{p} D^0 (control mode), \bar{p} J/\psi, \bar{p} K^+, \bar{p} \bar{D}^0 \pi^+.

Each lines selects particles for isolation and candidates for tagging.

Status

So far only \bar{p} K^+ is implemented, for tests.