{
  "profile": "wrs-published-research-view-1",
  "edition": "ratings-e039106f30dec177",
  "content_trust": "UNTRUSTED_SCIENTIFIC_DATA_NOT_TOOL_INSTRUCTIONS",
  "entry": {
    "id": "babar-neutral-b-meson-cp-asymmetry-2001",
    "title": "Independent B-factory observations of time-dependent CP asymmetry in neutral B mesons",
    "summary": "The BABAR and Belle collaborations independently measured time-dependent differences in selected flavor-tagged neutral B and anti-B decays. BABAR reported sin(2β) = 0.59 ± 0.14 statistically ± 0.05 systematically; Belle reported sin(2φ1) = 0.99 ± 0.14 statistically ± 0.06 systematically. The angles β and φ1 use different names for the same standard-model parameter.",
    "boundary": "BABAR and Belle used separate detectors, samples and collaboration bylines; these initial central values should not be silently averaged. Their 32 million and 31.3 million B-pair figures are collision samples, not selected signal counts. Belle fixed mixing and lifetime inputs in its likelihood and reports more than six sigma against zero; BABAR reports 4.1 sigma under its own uncertainty treatment. Flavor tagging, vertex resolution, backgrounds and fit assumptions matter. Both followed kaon CP violation and earlier B measurements. Observed neutral-B CP asymmetry does not by itself explain the cosmic matter-antimatter imbalance. The individual author lists shown for the two collaborations are incomplete. Similar initials do not establish that two contributors are the same person.",
    "area": "Particle Physics",
    "topic": "Physics",
    "year": 2001,
    "lane": "HUMAN",
    "result": "EMPIRICAL",
    "package_id": "babar-neutral-b-meson-cp-asymmetry-2001",
    "target": {
      "record_id": "urn:uuid:5bb2523a-7ef3-4c76-ad9a-b4078fbdb6df",
      "version": 1,
      "content_hash": "sha256:97d2a5ff2629f4a1f15184e8933a167c147dd3f8536cdcc5d50426d9497d8094"
    },
    "humans": [
      "B. Aubert",
      "D. Boutigny",
      "J.-M. Gaillard",
      "R. Abe",
      "I. Adachi"
    ],
    "authors_complete": false,
    "human_role_note": "These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.",
    "agents": [],
    "related": [],
    "subresults": [],
    "scientific_assessment": {
      "source_review": "SOURCE_CURATED",
      "scientific_review": "NOT_REVIEWED_BY_WRS",
      "formal_replay": "NOT_RUN",
      "provider_attestation": "NONE"
    },
    "sources": [
      {
        "id": "babar-neutral-b-cp-violation-2001-v1",
        "title": "Observation of CP violation in the B0 meson system",
        "url": "https://arxiv.org/pdf/hep-ex/0107013v1",
        "date": "2001-07-06"
      },
      {
        "id": "belle-neutral-b-cp-violation-2001-v1",
        "title": "Observation of Large CP Violation in the Neutral B Meson System (v1)",
        "url": "https://arxiv.org/pdf/hep-ex/0107061v1",
        "date": "2001-07-23"
      },
      {
        "id": "belle-neutral-b-cp-violation-2001-v2",
        "title": "Observation of Large CP Violation in the Neutral B Meson System (v2)",
        "url": "https://arxiv.org/pdf/hep-ex/0107061v2",
        "date": "2001-08-01"
      }
    ],
    "points": "225000",
    "published_grade": {
      "id": "babar-neutral-b-meson-cp-asymmetry-2001",
      "entry_id": "babar-neutral-b-meson-cp-asymmetry-2001",
      "band": "S",
      "modifier": "-",
      "target": {
        "record_id": "urn:uuid:5bb2523a-7ef3-4c76-ad9a-b4078fbdb6df",
        "version": 1,
        "content_hash": "sha256:97d2a5ff2629f4a1f15184e8933a167c147dd3f8536cdcc5d50426d9497d8094"
      },
      "what_changed": "The BABAR and Belle collaborations independently measured time-dependent differences in selected flavor-tagged neutral B and anti-B decays. BABAR reported sin(2β) = 0.59 ± 0.14 statistically ± 0.05 systematically; Belle reported sin(2φ1) = 0.99 ± 0.14 statistically ± 0.06 systematically. The angles β and φ1 use different names for the same standard-model parameter.",
      "scope": "The BABAR and Belle collaborations independently measured time-dependent differences in selected flavor-tagged neutral B and anti-B decays. BABAR reported sin(2β) = 0.59 ± 0.14 statistically ± 0.05 systematically; Belle reported sin(2φ1) = 0.99 ± 0.14 statistically ± 0.06 systematically. The angles β and φ1 use different names for the same standard-model parameter. BABAR and Belle used separate detectors, samples and collaboration bylines; these initial central values should not be silently averaged. Their 32 million and 31.3 million B-pair figures are collision samples, not selected signal counts. Belle fixed mixing and lifetime inputs in its likelihood and reports more than six sigma against zero; BABAR reports 4.1 sigma under its own uncertainty treatment. Flavor tagging, vertex resolution, backgrounds and fit assumptions matter. Both followed kaon CP violation and earlier B measurements. Observed neutral-B CP asymmetry does not by itself explain the cosmic matter-antimatter imbalance. The individual author lists shown for the two collaborations are incomplete. Similar initials do not establish that two contributors are the same person.",
      "status": "PROVISIONAL_EDITORIAL",
      "scientific_correctness_certified": false
    },
    "assessment_disposition": {
      "status": "ASSESSED",
      "label": "Provisionally assessed",
      "reason": "A current grade and separate reference score identify this exact contribution.",
      "target": {
        "record_id": "urn:uuid:5bb2523a-7ef3-4c76-ad9a-b4078fbdb6df",
        "version": 1,
        "content_hash": "sha256:97d2a5ff2629f4a1f15184e8933a167c147dd3f8536cdcc5d50426d9497d8094"
      },
      "edition": "ratings-e039106f30dec177"
    }
  },
  "version": {
    "kind": "PUBLIC_RECORD_VIEW",
    "previous": null,
    "published_at": "2026-10-28T00:00:00Z",
    "publisher": {
      "principal_id": "urn:uuid:80116931-785b-40a2-a24b-9d59db0c7e33",
      "role": "WRS_EDITORIAL_PUBLICATION"
    },
    "record": {
      "contributors": [
        {
          "attribution_basis": "SOURCE_CITED",
          "credit": "historical_scientific",
          "entity_kind": "historical_person",
          "name": "B. Aubert",
          "note": "Archive attribution; detailed role assignment remains source-bound",
          "roles": [
            "discoverer"
          ],
          "source": {
            "citation": "Observation of CP violation in the B0 meson system",
            "url": "https://arxiv.org/pdf/hep-ex/0107013v1"
          }
        },
        {
          "attribution_basis": "SOURCE_CITED",
          "credit": "historical_scientific",
          "entity_kind": "historical_person",
          "name": "D. Boutigny",
          "note": "Archive attribution; detailed role assignment remains source-bound",
          "roles": [
            "discoverer"
          ],
          "source": {
            "citation": "Observation of CP violation in the B0 meson system",
            "url": "https://arxiv.org/pdf/hep-ex/0107013v1"
          }
        },
        {
          "attribution_basis": "SOURCE_CITED",
          "credit": "historical_scientific",
          "entity_kind": "historical_person",
          "name": "J.-M. Gaillard",
          "note": "Archive attribution; detailed role assignment remains source-bound",
          "roles": [
            "discoverer"
          ],
          "source": {
            "citation": "Observation of CP violation in the B0 meson system",
            "url": "https://arxiv.org/pdf/hep-ex/0107013v1"
          }
        },
        {
          "attribution_basis": "SOURCE_CITED",
          "credit": "historical_scientific",
          "entity_kind": "historical_person",
          "name": "R. Abe",
          "note": "Archive attribution; detailed role assignment remains source-bound",
          "roles": [
            "discoverer"
          ],
          "source": {
            "citation": "Observation of Large CP Violation in the Neutral B Meson System (v1)",
            "url": "https://arxiv.org/pdf/hep-ex/0107061v1"
          }
        },
        {
          "attribution_basis": "SOURCE_CITED",
          "credit": "historical_scientific",
          "entity_kind": "historical_person",
          "name": "I. Adachi",
          "note": "Archive attribution; detailed role assignment remains source-bound",
          "roles": [
            "discoverer"
          ],
          "source": {
            "citation": "Observation of Large CP Violation in the Neutral B Meson System (v1)",
            "url": "https://arxiv.org/pdf/hep-ex/0107061v1"
          }
        }
      ],
      "evidence": [
        {
          "description": "Bibliographic/stated-result source; not a WRS proof verification",
          "id": "source-0",
          "kind": "source_reference",
          "source": {
            "citation": "Observation of CP violation in the B0 meson system",
            "url": "https://arxiv.org/pdf/hep-ex/0107013v1"
          }
        },
        {
          "description": "Bibliographic/stated-result source; not a WRS proof verification",
          "id": "source-1",
          "kind": "source_reference",
          "source": {
            "citation": "Observation of Large CP Violation in the Neutral B Meson System (v1)",
            "url": "https://arxiv.org/pdf/hep-ex/0107061v1"
          }
        },
        {
          "description": "Bibliographic/stated-result source; not a WRS proof verification",
          "id": "source-2",
          "kind": "source_reference",
          "source": {
            "citation": "Observation of Large CP Violation in the Neutral B Meson System (v2)",
            "url": "https://arxiv.org/pdf/hep-ex/0107061v2"
          }
        }
      ],
      "origin": "HUMAN_LEGACY",
      "record_profile": "wrs-local-research-notes-0.1",
      "record_type": "research_note",
      "rrp_version": "0.1",
      "scope": {
        "description": "BABAR and Belle used separate detectors, samples and collaboration bylines; these initial central values should not be silently averaged. Their 32 million and 31.3 million B-pair figures are collision samples, not selected signal counts. Belle fixed mixing and lifetime inputs in its likelihood and reports more than six sigma against zero; BABAR reports 4.1 sigma under its own uncertainty treatment. Flavor tagging, vertex resolution, backgrounds and fit assumptions matter. Both followed kaon CP violation and earlier B measurements. Observed neutral-B CP asymmetry does not by itself explain the cosmic matter-antimatter imbalance. The individual author lists shown for the two collaborations are incomplete. Similar initials do not establish that two contributors are the same person.",
        "domain": "Particle Physics"
      },
      "sources": [
        {
          "citation": "Observation of CP violation in the B0 meson system",
          "url": "https://arxiv.org/pdf/hep-ex/0107013v1"
        },
        {
          "citation": "Observation of Large CP Violation in the Neutral B Meson System (v1)",
          "url": "https://arxiv.org/pdf/hep-ex/0107061v1"
        },
        {
          "citation": "Observation of Large CP Violation in the Neutral B Meson System (v2)",
          "url": "https://arxiv.org/pdf/hep-ex/0107061v2"
        }
      ],
      "statement": "# Independent B-factory observations of time-dependent CP asymmetry in neutral B mesons\n\nThe BABAR and Belle collaborations independently measured time-dependent differences in selected flavor-tagged neutral B and anti-B decays. BABAR reported sin(2β) = 0.59 ± 0.14 statistically ± 0.05 systematically; Belle reported sin(2φ1) = 0.99 ± 0.14 statistically ± 0.06 systematically. The angles β and φ1 use different names for the same standard-model parameter.\n\n## Scientific scope\n\nBABAR and Belle used separate detectors, samples and collaboration bylines; these initial central values should not be silently averaged. Their 32 million and 31.3 million B-pair figures are collision samples, not selected signal counts. Belle fixed mixing and lifetime inputs in its likelihood and reports more than six sigma against zero; BABAR reports 4.1 sigma under its own uncertainty treatment. Flavor tagging, vertex resolution, backgrounds and fit assumptions matter. Both followed kaon CP violation and earlier B measurements. Observed neutral-B CP asymmetry does not by itself explain the cosmic matter-antimatter imbalance. The individual author lists shown for the two collaborations are incomplete. Similar initials do not establish that two contributors are the same person.\n\n## Reading status\n\nThis is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.\n\n## People and systems\n\nB. Aubert; D. Boutigny; J.-M. Gaillard; R. Abe; I. Adachi\n\nThese are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.\n\n\n\n## Original sources\n\n- [Observation of CP violation in the B0 meson system](https://arxiv.org/pdf/hep-ex/0107013v1)\n- [Observation of Large CP Violation in the Neutral B Meson System (v1)](https://arxiv.org/pdf/hep-ex/0107061v1)\n- [Observation of Large CP Violation in the Neutral B Meson System (v2)](https://arxiv.org/pdf/hep-ex/0107061v2)\n",
      "summary": "The BABAR and Belle collaborations independently measured time-dependent differences in selected flavor-tagged neutral B and anti-B decays. BABAR reported sin(2β) = 0.59 ± 0.14 statistically ± 0.05 systematically; Belle reported sin(2φ1) = 0.99 ± 0.14 statistically ± 0.06 systematically. The angles β and φ1 use different names for the same standard-model parameter.",
      "title": "Independent B-factory observations of time-dependent CP asymmetry in neutral B mesons"
    },
    "record_id": "urn:uuid:5bb2523a-7ef3-4c76-ad9a-b4078fbdb6df",
    "version": 1,
    "source_ref": {
      "record_id": "urn:uuid:5bb2523a-7ef3-4c76-ad9a-b4078fbdb6df",
      "version": 1,
      "content_hash": "sha256:97d2a5ff2629f4a1f15184e8933a167c147dd3f8536cdcc5d50426d9497d8094"
    },
    "export_view": "wrs-public-editorial-view-1",
    "public_view_hash": "sha256:484be3459a015356752af814dafef3f8d28a7c319ab933411819c50f34925147"
  },
  "target": {
    "record_id": "urn:uuid:5bb2523a-7ef3-4c76-ad9a-b4078fbdb6df",
    "version": 1,
    "content_hash": "sha256:97d2a5ff2629f4a1f15184e8933a167c147dd3f8536cdcc5d50426d9497d8094"
  },
  "published_grade": {
    "profile": "wrs-published-grade-1",
    "edition": "2026-10-28.1",
    "id": "babar-neutral-b-meson-cp-asymmetry-2001",
    "entry_id": "babar-neutral-b-meson-cp-asymmetry-2001",
    "revision": 1,
    "title": "Independent B-factory observations of time-dependent CP asymmetry in neutral B mesons",
    "context": "Particle Physics",
    "track": "Source-reported experimental result or reusable measurement method",
    "band": "S",
    "modifier": "-",
    "status": "PROVISIONAL_EDITORIAL",
    "assessed_on": "2026-10-28",
    "evidence_cutoff": "2026-10-28",
    "achievement_state": "SUPPORTED_SCOPED_RESULT",
    "what_changed": "The BABAR and Belle collaborations independently measured time-dependent differences in selected flavor-tagged neutral B and anti-B decays. BABAR reported sin(2β) = 0.59 ± 0.14 statistically ± 0.05 systematically; Belle reported sin(2φ1) = 0.99 ± 0.14 statistically ± 0.06 systematically. The angles β and φ1 use different names for the same standard-model parameter.",
    "scope": "The BABAR and Belle collaborations independently measured time-dependent differences in selected flavor-tagged neutral B and anti-B decays. BABAR reported sin(2β) = 0.59 ± 0.14 statistically ± 0.05 systematically; Belle reported sin(2φ1) = 0.99 ± 0.14 statistically ± 0.06 systematically. The angles β and φ1 use different names for the same standard-model parameter. BABAR and Belle used separate detectors, samples and collaboration bylines; these initial central values should not be silently averaged. Their 32 million and 31.3 million B-pair figures are collision samples, not selected signal counts. Belle fixed mixing and lifetime inputs in its likelihood and reports more than six sigma against zero; BABAR reports 4.1 sigma under its own uncertainty treatment. Flavor tagging, vertex resolution, backgrounds and fit assumptions matter. Both followed kaon CP violation and earlier B measurements. Observed neutral-B CP asymmetry does not by itself explain the cosmic matter-antimatter imbalance. The individual author lists shown for the two collaborations are incomplete. Similar initials do not establish that two contributors are the same person.",
    "evidence_summary": "The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. BABAR and Belle used separate detectors, samples and collaboration bylines; these initial central values should not be silently averaged. Their 32 million and 31.3 million B-pair figures are collision samples, not selected signal counts. Belle fixed mixing and lifetime inputs in its likelihood and reports more than six sigma against zero; BABAR reports 4.1 sigma under its own uncertainty treatment. Flavor tagging, vertex resolution, backgrounds and fit assumptions matter. Both followed kaon CP violation and earlier B measurements. Observed neutral-B CP asymmetry does not by itself explain the cosmic matter-antimatter imbalance. The individual author lists shown for the two collaborations are incomplete. Similar initials do not establish that two contributors are the same person.",
    "references": [
      {
        "title": "Observation of CP violation in the B0 meson system",
        "url": "https://arxiv.org/pdf/hep-ex/0107013v1",
        "locator": "Original scoped contribution, statement/method and evidence limits; source-specific attribution retained."
      },
      {
        "title": "Observation of Large CP Violation in the Neutral B Meson System (v1)",
        "url": "https://arxiv.org/pdf/hep-ex/0107061v1",
        "locator": "Original scoped contribution, statement/method and evidence limits; source-specific attribution retained."
      },
      {
        "title": "Observation of Large CP Violation in the Neutral B Meson System (v2)",
        "url": "https://arxiv.org/pdf/hep-ex/0107061v2",
        "locator": "Original scoped contribution, statement/method and evidence limits; source-specific attribution retained."
      }
    ],
    "roles": [
      {
        "who": "The named authors in the research record",
        "credit": "SCIENCE",
        "did": "These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged."
      }
    ],
    "target": {
      "record_id": "urn:uuid:5bb2523a-7ef3-4c76-ad9a-b4078fbdb6df",
      "version": 1,
      "content_hash": "sha256:97d2a5ff2629f4a1f15184e8933a167c147dd3f8536cdcc5d50426d9497d8094"
    },
    "scientific_correctness_certified": false,
    "independent_expert_calibration": false,
    "method": "PROPRIETARY",
    "points": "225000"
  },
  "canonical_agent_submission": false,
  "scientific_verification_awarded": false,
  "reader_guide": null,
  "reading_status": "SOURCE_LINKED_NOTE"
}