Pith Number

pith:2WBZ2HCW

pith:2015:2WBZ2HCWOLDU4U5PMCRFADOJ5A

not attested not anchored not stored refs pending

Observation of positronium annihilation in the 2S state: towards a new measurement of the 1S-2S transition frequency

A. Antognini, A. Gabard, A. Rubbia, B. Brown, D. A. Cooke, J. Alnis, K. Kirch, P. Crivelli, S. Friedreich, T. W. Haensch, V. Vrankovic

arxiv:1503.05755 v1 · 2015-03-19 · physics.atom-ph · hep-ex

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{2WBZ2HCWOLDU4U5PMCRFADOJ5A}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-18T02:20:58.169569Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d5839d1c5672c74e53af60a2500dc9e81478e8256398236ca14f9548652b93be

Aliases

arxiv: 1503.05755 · arxiv_version: 1503.05755v1 · doi: 10.48550/arxiv.1503.05755 · pith_short_12: 2WBZ2HCWOLDU · pith_short_16: 2WBZ2HCWOLDU4U5P · pith_short_8: 2WBZ2HCW

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/2WBZ2HCWOLDU4U5PMCRFADOJ5A \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: d5839d1c5672c74e53af60a2500dc9e81478e8256398236ca14f9548652b93be

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c0694a812aa1a68077dafdfb558f598deccd1a38f12124ff6a99063e64f35a3b",
    "cross_cats_sorted": [
      "hep-ex"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.atom-ph",
    "submitted_at": "2015-03-19T13:08:42Z",
    "title_canon_sha256": "eacd31eaaf5c91bd422905c0a157f546c18ff8ec4fdea82f6396da2898a32d0d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1503.05755",
    "kind": "arxiv",
    "version": 1
  }
}