Oct 27 – 30, 2025
CERN
Europe/Zurich timezone

ISpy NanoAOD: An event display for the NanoAOD format of the CMS Experiment

Oct 27, 2025, 3:30 PM
10m
40/S2-B01 - Salle Bohr (CERN)

40/S2-B01 - Salle Bohr

CERN

100
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Speaker

Thomas McCauley (University of Notre Dame (US))

Description

The CMS Experiment introduced a new lightweight format for physics analysis, NanoAOD, during Run 2. Stored as ROOT TTrees, NanoAOD can be read directly with ROOT or with Python libraries such as uproot. Current CMS event displays rely on the larger MiniAOD data tier, which requires CMS-specific software and resources and includes information not available in NanoAOD.
ISpy NanoAOD is a prototype Python package that provides interactive 3D visualization of NanoAOD event content within Jupyter notebooks. Built on uproot, awkward, and pythreejs (a Python–three.js bridge for Jupyter widgets), it offers lightweight, synoptic views of events directly from NanoAOD.

Author

Thomas McCauley (University of Notre Dame (US))

Presentation materials