{
  "abstract": "The GBAR experiment has measured the formation rate of antihydrogen from antiproton impact on a positronium cloud for antiproton kinetic energies of 4 and 6 keV. This is the first charge-exchange cross section measurement performed using antiproton beams, which are provided by the AD-ELENA facility at CERN. The measured cross section values are $(14.1 \\pm 1.3 \\mathrm{(stat)} ^{+2.2}_{-1.4} \\mathrm{(sys)}) \\times 10^{-16}$~cm$^2$ at 6.2 keV energy and $(8.7 \\pm 2.4 \\mathrm{(stat)} ^{+1.5}_{-0.09} \\mathrm{(sys)}) \\times 10^{-16}$~cm$^2$ at 4.15 keV energy, and agree with recent theoretical three-body calculations for antihydrogen formation. These measurements are an important input for experiments with antimatter, e.g the planned measurements of antihydrogen gravitational acceleration in the GBAR collaboration.",
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  "arxiv": "2609.33990",
  "author_total": 44,
  "authors": [
    {
      "name": "P Adrich"
    },
    {
      "name": "I Belosevic"
    },
    {
      "name": "M Chung"
    },
    {
      "name": "P Cladé"
    },
    {
      "name": "P Comini"
    },
    {
      "name": "P Crivelli"
    },
    {
      "name": "P Debu"
    },
    {
      "name": "A Douillet"
    },
    {
      "name": "S Geffroy"
    },
    {
      "name": "S Guellati-Khelifa"
    },
    {
      "name": "P Guichard"
    },
    {
      "name": "P.-A Hervieux"
    },
    {
      "name": "L Hilico"
    },
    {
      "name": "P Indelicato"
    },
    {
      "name": "S Jonsell"
    },
    {
      "name": "J.-P Karr"
    },
    {
      "name": "B Kim"
    },
    {
      "name": "S Kim"
    },
    {
      "name": "E.-S Kim"
    },
    {
      "name": "N Kuroda"
    },
    {
      "name": "B Lee"
    },
    {
      "name": "L Liszkay"
    },
    {
      "name": "D Lunney"
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    {
      "name": "G Manfredi"
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    {
      "name": "B Mansoulié"
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    {
      "name": "V Martimort"
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    {
      "name": "M Matusiak"
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    {
      "name": "V Nesvizhevsky"
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    {
      "name": "F Nez"
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    {
      "name": "K Park"
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    {
      "name": "N Paul"
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    {
      "name": "E Perez"
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    {
      "name": "P Pérez"
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    {
      "name": "C Regenfus"
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    {
      "name": "C Roumegou"
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    {
      "name": "J.-Y Roussé"
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    {
      "name": "F Schmidt-Kaler"
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    {
      "name": "K Szymczyk"
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    {
      "name": "T.A Tanaka"
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    {
      "name": "B Tuchming"
    },
    {
      "name": "D.P van der Werf"
    },
    {
      "name": "D Won"
    },
    {
      "name": "S Wronka"
    },
    {
      "name": "P Yzombard"
    }
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  "bibtex": "https://research.draconitic.com/paper/7e82494bwrmcp.bib",
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  "doi": "10.48550/arxiv.2609.33990",
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  "pdf_url": "https://arxiv.org/pdf/2609.33990",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-27",
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  "ris": "https://research.draconitic.com/paper/7e82494bwrmcp.ris",
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      "first_seen": "2026-10-30T12:17:49Z",
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      "field": "physics",
      "origin": "arxiv:hep-ex",
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  ],
  "title": "First measurement of the antihydrogen production cross section through the charge-exchange reaction of low-energy antiprotons with orthopositronium",
  "title_text": "First measurement of the antihydrogen production cross section through the charge-exchange reaction of low-energy antiprotons with orthopositronium",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:12Z",
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