---
title: "ATLAS and CMS discovered the Higgs boson with about 10 fb⁻¹ of integrated luminosity, a tenth of the 100 fb⁻¹ their own technical design reports said would be needed to guarantee discovery"
type: "claim"
status: "seedling"
source_url: "https://arxiv.org/abs/2611.03315"
source_author: "John Ellis"
source_date: "2026-11-02"
source_title: "The search for the Higgs Boson and the EBH mechanism"
source_venue: "arXiv:2611.03315 [physics.hist-ph]"
source_quote: "ATLAS and CMS guaranteed the discovery of the Higgs boson with 100 fb−1 , but they discovered it with about 10 fb−1 [54]."
source_tier: 1
source_sha: "6c0e656978f7f3e5bc4b215e5473692139abd9f6e01805a8abfe47ffa27a23d3"
audit_status: "capture-verified — direct read of arXiv PDF (sha 6c0e656978f7f3e5bc4b215e5473692139abd9f6e01805a8abfe47ffa27a23d3) at capture, 2026-11-03. The 100 fb⁻¹ TDR figure is cited by Ellis to the ATLAS and CMS Physics Technical Design Reports ([74]/[75]); the 2012 discovery papers are cited as [54] (Phys. Lett. B 716 (2012), the ATLAS/CMS Higgs discovery papers). Neither the TDRs nor the discovery papers were independently re-fetched this session; the quantitative claim rests on Ellis's own Tier-1 statement of both figures side by side, not on a separately re-derived comparison. APPENDED 2026-11-05, cross-model audit (writer claude-sonnet-5, auditor claude-fable-5): source_quote re-verified verbatim against a live re-fetch of the arXiv PDF (sha matches capture, 6c0e65…); source_sha corrected from the abstract-page archive (was ac2df57e25ab5adc902fb3f4c14d2cd0021e43d4a93c27a33b1b85b296424d0e) to the PDF the quote was actually read from, matching house convention. One nuance recorded: Ellis's Fig. 12 caption plots the ATLAS and CMS TDR projections 'assuming 100 (30) fb−1 of integrated luminosity' respectively — his prose sentence attributes the 100 fb⁻¹ guarantee to both, but his own figure shows the CMS projection at 30 fb⁻¹; the TDRs themselves remain unread. Body wording '(1999 and contemporaneous)' corrected — Ellis dates only the ATLAS TDR to 1999 and says the CMS TDR 'appeared a few years later' (his ref [75] is J. Phys. G 34, 2007)."
provenance: "Promotion from 10-inbox/raw/2026-11-03-outside-arxiv261103315-the-search-for-the-higgs-boson.md, 2026-11-04"
origin: "batch"
derived_from: "10-inbox/raw/2026-11-03-outside-arxiv261103315-the-search-for-the-higgs-boson.md"
date_created: "2026-11-04T00:00:00.000Z"
writer_model: "claude-sonnet-5"
tags: ["physics","history-of-science","higgs-boson","LHC","ATLAS","CMS","CERN"]
seek_code_commit: "d40ee39"
quote_sweep: "PASS 2026-11-06 — recheck: source_quote verbatim in the capture-time archive (sha256 6c0e656978f7…); was: FAIL 2026-11-05 — source_quote NOT found in the capture-time archive (sha256 ac2df57e25ab…) — the quote does not match the bytes read at capture; repair before promotion; RESOLVED 2026-11-05 (cross-model audit, claude-fable-5): false negative — the sweep checked the abstract-page archive (ac2df5…) but the quote was read from the PDF; quote verified verbatim against a live re-fetch of arXiv:2611.03315's PDF (sha 6c0e656978f7f3e5bc4b215e5473692139abd9f6e01805a8abfe47ffa27a23d3, matches capture); source_sha now points at the PDF (quote since repaired, or the earlier check misread the extraction)"
verified_verbatim: "2026-11-05 — source_quote matched verbatim (normalized) against a direct fetch of source_url by seek_verify (no model involved)"
---


The ATLAS and CMS Physics Technical Design Reports (ATLAS published 1999;
the CMS physics TDR, per Ellis, "appeared a few years later" — his reference
places it in J. Phys. G 34, 2007) stated that 100 fb⁻¹ of integrated
luminosity would be needed to *guarantee* a Higgs discovery across the full
range of possible masses. The actual 2012
discovery required roughly a tenth of that figure — about 10 fb⁻¹ — because
the Higgs turned out to sit at a mass (near 125 GeV) with an unusually
favorable combination of production and decay channels for the LHC
detectors, rather than at a harder-to-reach point the guarantee figure had
to cover.

This pairs with [[claim-lep-shutdown-2000-higgs-mass-limit-114-4-gev-aleph-excess-unconfirmed|the
LEP shutdown claim]] as a second instance of the same pattern in this
capture: a planning figure calibrated to the worst case turning out, after
the fact, to have been far more conservative than nature required. Both are
quantitative claims resting on a single Tier-1 historical source (Ellis
himself) restating figures from primary technical documents he does not
quote directly in this paper; the underlying TDRs and discovery papers
remain unread by this vault.

> [!note] Seek's commentary:
> "Guaranteed" is a planning word, not a prediction — it's the number you need to cover every unlucky draw, and the Higgs simply wasn't an unlucky draw. Ten percent of the insured amount is still a good outcome; it says more about how conservatively 100 fb⁻¹ was chosen than about how lucky anyone was. — Seek