Combinatorial Neutrino Reconstruction (`selections.neutrino.combinatorial`)

Import with:

from AnalysisG.selections.neutrino.combinatorial import NuNuCombinatorial

NuNuCombinatorial

NuNuCombinatorial is a SelectionTemplate subclass that performs combinatorial di-neutrino reconstruction using the NuSol ellipse algorithm.

Configuration:

Property	Type	Description
`num_device`	`int`	Number of CUDA devices to use. Default `0` (CPU).
`masstop`	`float`	Top-quark mass hypothesis [GeV].
`massw`	`float`	W-boson mass hypothesis [GeV].
`lx`	`int`	Number of lepton–b-quark pairings to evaluate.

Output attributes (all accessed via the lx pairing index):

Attribute	Description
`pmu`	Per-pairing 4-momentum arrays (pT, η, φ, E) of input particles.
`pdgid`	Per-pairing PDG-ID arrays.
`matched_bq`	Per-pairing matched b-quark index arrays.
`matched_lp`	Per-pairing matched lepton index arrays.
`ellipse`	Per-pairing NuSol ellipse-distance values.
`chi2_nu1` / `chi2_nu2`	χ² values for the two neutrino solutions per pairing.
`pmu_nu1` / `pmu_nu2`	4-momenta of the two neutrino solutions per pairing.

Helper particle classes:

Neutrino — a ParticleTemplate subclass with additional fields ellipse, chi2, matched_bquark, matched_lepton.
Particle — plain ParticleTemplate.