DELPHI event display
DELPHI events straight from edm4hep — no DELGRA, no X11, no ROOT. Drawn with Plotly, and it runs in your browser.
.edm4hep.root file to explore any event.
Documentation →
Install, command line, collections and roles, what is drawn, the decoding rules, Python API.
What it does
Opens any DELPHI edm4hep file, in the browser. Drop a file on the display and uproot reads it locally under Pyodide — nothing is uploaded, and there is no server behind this page.
Nothing is pinned by collection name. A DELPHI file holds 3 Track collections, 7
Vertex, 4 Cluster, 2 TrackerHit3D and 24 ParticleID. The display
discovers them from podio's own metadata and binds each part of the picture to one by role, which you can
change. Beside the figure, every collection is listed with its type, domain, provenance, links and per-event count;
select one and everything not from it dims, or click a track to select its collection.
Only measured quantities are drawn. Tracks are helices from their own perigee parameters, started at the vertex they belong to, with the back-extrapolation to the IP dotted so the picture never claims a path the particle did not travel.
Four panels, or the detector
- (a) r-φ whole event — helices, EM showers as towers, the HPC radius taken from the shower positions
- (b) r-z — the same tracks, r signed by thrust hemisphere
- (c) vertex detector — VD layers, R-φ hits, primary and secondary vertices; zoom replaces the fixed inset
- (d) RICH — Cherenkov angle against momentum, liquid and gas radiators, with π/K/p curves and veto markers
- 3-D — the barrels, the helices in space, showers and vertices, physically proportional
From the command line
pip install -e .
delphi-display FILE.edm4hep.root --entry 3990 --out event.html --view bothSee the command-line reference.