# E4-muon

Rows: 2. Files: E4-muon.csv, E4-muon.json (same rows).
Unit: microseconds.

Columns:
- value: measured value
- sigma: 1-sigma uncertainty, same unit
- source: publication (authors, journal, volume, page)
- year: year of publication
- provenance: where the lab first read the number (internal notes name the lab record; the primary source is the source column)
- pooled: yes: used in the combined value; no: shown as a cross-check only

Notes from the record:
- E4 muon lifetime in the CERN storage ring. Quantity: lab lifetime, microseconds. Prediction gamma x tau0, gamma = 29.327 (Bailey 1977, as restated in arXiv 1508.02339), tau0 = 2.1969811 us (CODATA 2018, the record's value). One gamma for both signs, so the prediction error is common.

Source of the data: the publications in the source column.

Licence: Values are numerical results quoted from the cited publications; the publications themselves remain under their publishers' copyright and licences, and the numbers are reproduced here for scholarly citation, each with its source. This compilation (the selection, the columns and the notes): licence to be set by the author; CC BY 4.0 proposed.

sha256 of E4-muon.csv: 184f2c51d1400439a390245c2c791da158499e7dfaf3366a305262d02c654863
Record file last written: 2026-11-07 19:14:10 IST.