{
  "abstract": "Motivated by the recent HAL QCD lattice results on the $D$ - $D^*$ potential at nearly physical point $m_π=146.4$ MeV, we theoretically examine effects from the two-pion exchange in (semi-)long-range parts of the $DD^*$ system. We employ the framework of heavy-meson chiral perturbation theory with heavy-quark spin symmetry. The pion exchanges up to next-to-next-to-leading order (N$^2$LO) are taken into account. In order to separate the (semi-)long-range contributions, we apply the dispersion-relation method to one-loop diagrams. As a result, we find that the lattice data on the $D$ - $D^*$ potential in the regime of $0.5\\, {\\rm fm} \\lesssim r$ is reproduced by adjusting the unknown $O(p^2)$ couplings. In particular, it turns out that contributions from isospin-independent N$^2$LO triangle diagrams play a central role in reproducing the lattice data of the form $V^{DD^*}\\sim \\left({\\rm e}^{-m_πr}/r\\right)^2$ in $1.0\\, {\\rm fm} \\lesssim r\\lesssim 2.0\\, {\\rm fm}$. We also present predictions of other $D^{(*)}$ - $D^{(*)}$ potentials, where the similar two-pion exchange tail is predicted. Our findings provide useful information on the (semi-)long-range regime of the $D$ - $D^*$ potential focusing on two-pion exchanges.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.10016",
  "author_total": 2,
  "authors": [
    {
      "name": "Daiki Suenaga"
    },
    {
      "name": "Masayasu Harada"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/87hszs2behpbq.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.10016",
  "fulltext_url": null,
  "id": "87hszs2behpbq",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.10016",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "hep-lat"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "arxiv",
      "nucl-th"
    ],
    [
      "openalex",
      "3106|Quantum Chromodynamics and Particle Interactions"
    ]
  ],
  "openalex": "W7221043826",
  "pdf_url": "https://arxiv.org/pdf/2610.10016",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/87hszs2behpbq.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:37Z",
      "native_id": "2610.10016",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.10016"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-lat",
      "subfield": "high-energy"
    },
    {
      "field": "physics",
      "origin": "arxiv:nucl-th",
      "subfield": "nuclear"
    }
  ],
  "title": "Two-pion exchange potential in $D^{(*)}D^{(*)}$ system",
  "title_text": "Two-pion exchange potential in D^(*)D^(*) system",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:37Z",
  "url": "https://research.draconitic.com/paper/87hszs2behpbq",
  "venue": "arXiv",
  "versions": []
}