Tracking volume comparison: saveall vs longtv

This page compares the two candidate fixes for the MCParticle Lambda bugs (see the campaign index for bug links):

• saveall — runs with --part.keepAllParticles=True (tracking-volume handler ON, but the flag is supposed to preserve everything). Intended as the physics-correct baseline.
• longtv — runs with the new, extended tracking volume proposed in eic/epic#1081. Keeps the handler but makes the Λ decay region fit inside the volume so daughter particles are kept without the save-all crutch.

All plots are produced by analysis/acceptance/plot_lambda_endpoints.py and show primary Λ (lam_is_first == 1) endpoints, grouped by daughter count nd ∈ {0, 1, 2, ≥3, any}.

How to read Use the global selector at the top to switch everything to one energy or variant at once. Use the per-plot dropdown to pick any pair — in particular the saveall X vs longtv X comparisons show saveall first, longtv below, which is the intended reading order.

Display Mode:-- Select display mode --saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

All plots below will show: saveall 5x41 vs longtv 5x41

I. ZX plane (EIC detector overlay)

Scatter — coloured by daughter count

Primary Λ endpoint ZX — coloured by n daughters

Per-event scatter of Λ endpoints in the ZX plane. Colour encodes number of recorded daughters (0, 1, 2, ≥3).

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

2-D histogram, all categories (any nd)

ZX endpoint density — any nd

Combined density of all primary Λ endpoints in the ZX plane.

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

2-D histogram, nd = 0 (undecayed)

ZX endpoint density — nd = 0

Primary Λ with no recorded daughters — indicates the particle left the simulated volume without decaying OR that the tracking-volume bug dropped its daughters.

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

2-D histogram, nd = 1

ZX endpoint density — nd = 1

Primary Λ with a single recorded daughter (partial-keep artefact).

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

2-D histogram, nd = 2 (canonical two-body)

ZX endpoint density — nd = 2

Canonical two-body Λ decay topology (p π- or n π0).

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

2-D histogram, nd ≥ 3 (showering)

ZX endpoint density — nd ≥ 3

Showering / re-interacting Λ endpoints.

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

II. ZY plane

Scatter

Primary Λ endpoint ZY — coloured by n daughters

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

2-D histograms

ZY endpoint density — any nd

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

ZY endpoint density — nd = 0

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

ZY endpoint density — nd = 1

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

ZY endpoint density — nd = 2

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

ZY endpoint density — nd ≥ 3

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

III. ZR plane (EIC detector overlay, R = sqrt(X²+Y²))

Scatter

Primary Λ endpoint ZR — coloured by n daughters

Radial view. Since R ≥ 0, only the upper half of the overlaid detector cross-section receives data points.

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

2-D histograms

ZR endpoint density — any nd

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

ZR endpoint density — nd = 0

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

ZR endpoint density — nd = 1

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

ZR endpoint density — nd = 2

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

ZR endpoint density — nd ≥ 3

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

IV. 1-D Λ endpoint Z distributions

Overlay (all categories on one figure)

Λ endpoint Z — categories overlaid

Step histograms per daughter-count category plus a dashed outline for the combined sample.

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

Λ endpoint Z — categories overlaid (log y)

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

Per category, with EIC image as a Z-landmark ribbon

Λ endpoint Z — any nd

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

Λ endpoint Z — nd = 0

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

Λ endpoint Z — nd = 1

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

Λ endpoint Z — nd = 2

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

Λ endpoint Z — nd ≥ 3

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

V. Λ polar angle with respect to +Z

The EIC hadron-beam crossing angle (25 mrad) is marked on both plots.

Primary Λ polar angle θ (mrad), categories overlaid

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

Primary Λ polar angle θ (mrad), log y

saveall 5x41longtv 5x41saveall 10x100longtv 10x100saveall 10x130longtv 10x130saveall 18x275longtv 18x275saveall 5x41 vs longtv 5x41saveall 5x41 vs saveall 10x100saveall 5x41 vs longtv 10x100saveall 5x41 vs saveall 10x130saveall 5x41 vs longtv 10x130saveall 5x41 vs saveall 18x275saveall 5x41 vs longtv 18x275longtv 5x41 vs saveall 10x100longtv 5x41 vs longtv 10x100longtv 5x41 vs saveall 10x130longtv 5x41 vs longtv 10x130longtv 5x41 vs saveall 18x275longtv 5x41 vs longtv 18x275saveall 10x100 vs longtv 10x100saveall 10x100 vs saveall 10x130saveall 10x100 vs longtv 10x130saveall 10x100 vs saveall 18x275saveall 10x100 vs longtv 18x275longtv 10x100 vs saveall 10x130longtv 10x100 vs longtv 10x130longtv 10x100 vs saveall 18x275longtv 10x100 vs longtv 18x275saveall 10x130 vs longtv 10x130saveall 10x130 vs saveall 18x275saveall 10x130 vs longtv 18x275longtv 10x130 vs saveall 18x275longtv 10x130 vs longtv 18x275saveall 18x275 vs longtv 18x275

Notes

• The interesting regions to watch are (a) the nd = 0 populations — ideally these concentrate far downstream or at world-volume boundaries, not inside the detector, and (b) the nd ≥ 3 populations, which should be rare. A working fix moves events out of nd = 0 and nd ≥ 3 into nd = 2.
• The angular overlay is the cleanest sanity check: all variants must peak at 25 mrad (hadron beam) and show consistent tails. Any big asymmetry between saveall and longtv there indicates a different kinematic pre-selection slipped in, not a tracking-volume effect.