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    "story_id": "mp-2026-08-08-011",
    "source_story_id": "tmp-story-spt3g-lensing-template",
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    "headline": "The Lensing Template Left Half the B-Mode Power Behind",
    "slug": "the-lensing-template-left-half-the-b-mode-power-behind",
    "dek": "SPT-3G and Planck data produced a foreground-robust template intended to clear contamination from primordial-wave searches.",
    "summary": "SPT-3G and Planck data produced a foreground-robust template intended to clear contamination from primordial-wave searches.",
    "body_text": "The team combined SPT-3G polarization and reconstructed lensing data with a Planck cosmic-infrared-background tracer, then tested estimators with different foreground immunity. Simulations put residual foreground bias below 10 percent of the template power spectrum's statistical uncertainty for the profile-hardened construction; data-difference tests found no significant contamination. Its residual lensing B-mode power averaged about 0.48 over the stated angular range, which the authors call the highest delensing efficiency for such a template to date; it has not detected primordial gravitational waves.",
    "why_it_matters": "SPT-3G and Planck data produced a foreground-robust template intended to clear contamination from primordial-wave searches.",
    "limitations": [
      "Its residual lensing B-mode power averaged about 0.48 over the stated angular range, which the authors call the highest delensing efficiency for such a template to date; it has not detected primordial gravitational waves."
    ],
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    "first_published_at": "2026-08-08T09:00:00.000-04:00",
    "modified_at": "2026-08-08T09:00:00.000-04:00",
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        "text": "SPT-3G and Planck data produced a foreground-robust template intended to clear contamination from primordial-wave searches.",
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        "qualification": "Its residual lensing B-mode power averaged about 0.48 over the stated angular range, which the authors call the highest delensing efficiency for such a template to date; it has not detected primordial gravitational waves."
      }
    ],
    "source_ids": [
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    "tags": [
      "cosmic microwave background",
      "gravitational waves",
      "SPT-3G",
      "Planck"
    ],
    "image_url": null,
    "corrections": []
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  "sources": [
    {
      "source_id": "source-2026-08-08-011",
      "title": "arXiv preprint 2608.06343",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2608.06343",
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      "accessed_at": "2026-08-08T08:24:00.000-04:00",
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    "name": "The Machine Press",
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  "cite_this_report": {
    "title": "The Lensing Template Left Half the B-Mode Power Behind",
    "publisher": "The Machine Press",
    "published_at": "2026-08-08T09:00:00.000-04:00",
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