{
  "id": 3776773,
  "title": "ATLAS and CMS narrow in on double-Higgs production",
  "url": "https://urgent.news/2026/08/27/atlas-and-cms-narrow-in-on-double-higgs-production",
  "topic": "science",
  "section": "Science",
  "published": "2026-08-27T11:40:06.000Z",
  "source": {
    "name": "CERN",
    "slug": "cern",
    "url": "https://home.cern/atlas-and-cms-narrow-in-on-double-higgs-production/"
  },
  "original_language": "en",
  "account": "Collaborations at the Large Hadron Collider, ATLAS and CMS, have refined constraints on the production rate of double-Higgs bosons. Researchers presented their findings at the International Conference on High Energy Physics 2026. The Higgs boson was discovered in 2012 at the LHC, initiating a new era in particle physics. The Higgs boson's interactions with other particles are crucial in determining their mass. However, observing the Higgs boson interacting with itself remains a challenge. This process, if observed, could test the Standard Model's limits and reveal the stability of the universe's vacuum. The rarity of double-Higgs production makes it difficult to study. Researchers estimate that for around 1500 single Higgs bosons produced in LHC collisions, only one pair will be produced. To search for double-Higgs production, ATLAS and CMS looked for signs of the two Higgs bosons decaying into other particles, specifically one decaying into a bottom quark and antiquark and the other into a tau particle and its antiparticle. Both collaborations searched for double-Higgs production using data from previous LHC runs. By incorporating the most recent third run of the LHC and using advanced machine-learning techniques, ATLAS and CMS were able to conduct a more sensitive search for double-Higgs bosons decaying into two bottom quarks and two tau particles. They identified more events consistent with double-Higgs production compared to previous studies, but the signal is not strong enough to confirm the production. ATLAS saw a 2.6 standard deviation excess above what would be expected without double-Higgs production, hinting at the presence of pairs of Higgs bosons. CMS ruled out double-Higgs production rates exceeding four times the current Standard Model prediction. Both collaborations also set limits on the Higgs self-coupling parameter, which determines the Higgs boson's interaction strength with another Higgs boson. These results indicate a promising direction for future analyses combining full LHC Run 2 and Run 3 datasets and all decay modes, potentially revealing more about double-Higgs boson production. The High-Luminosity LHC, with its increased collision rate, will provide around six times more data, bringing researchers closer to observing double-Higgs boson production. Additional information about these studies is available on the ATLAS and CMS websites.",
  "summary": "Finding one Higgs boson was hard enough, but physicists at the Large Hadron Collider (LHC) are hunting for something even more elusive: pairs of Higgs bosons. At the recent International Conference on High Energy Physics 2026, the ATLAS and CMS Collaborations presented new constraints on the double-Higgs production rate, providing insight into how the Higgs […]",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 3,
    "also_reported_by": [
      {
        "outlet": "CERN",
        "title": "ATLAS and CMS narrow in on twin Higgs production",
        "url": "https://urgent.news/2026/08/27/atlas-and-cms-narrow-in-on-twin-higgs-production",
        "published": "2026-08-27T11:40:06.000Z"
      },
      {
        "outlet": "Phys.org",
        "title": "ATLAS and CMS narrow in on twin Higgs production",
        "url": "https://urgent.news/2026/08/27/atlas-and-cms-narrow-in-on-twin-higgs-production-3781395",
        "published": "2026-08-27T17:00:04.000Z"
      }
    ]
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}