{
  "abstract": "We present FTFT (Fixed-Target Fragmentation Tune), a set of Pythia8 parameters optimised for the production of charm and beauty hadrons in fixed-target collisions at centre-of-mass energies $\\sqrt{s} \\simeq 20-42$ GeV. Accurate heavy-flavour production in this regime is needed to predict neutrino fluxes and hidden-particle yields at beam-dump experiments such as SHiP. The tune is derived in two stages. First, differential distributions in Feynman-$x$ ($x_F$), transverse momentum squared ($p_T^2$), and charge or leading-particle production asymmetry of $D$ mesons are fitted to data from pion- and proton-beam fixed-target experiments. Second, $K$-factors for each beam are extracted from inclusive charm cross-section measurements to scale the simulated cross section to the measured data. The fitted charm-fragmentation and multiparton-interaction parameters depart from standard LHC-tuned defaults, in line with earlier fixed-target studies.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.29076",
  "author_total": 3,
  "authors": [
    {
      "name": "Matei Climescu"
    },
    {
      "name": "Didar Dobur"
    },
    {
      "name": "Kirill Skovpen"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/er2zafcr7s4kp.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.29076",
  "fulltext_url": null,
  "id": "er2zafcr7s4kp",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.29076",
  "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-ex"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "openalex",
      "3106|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7204963758",
  "pdf_url": "https://arxiv.org/pdf/2608.29076",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/er2zafcr7s4kp.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:41Z",
      "native_id": "2608.29076",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.29076"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "A Pythia8 Tune for Open Charm and Beauty Production in Fixed-Target Collisions",
  "title_text": "A Pythia8 Tune for Open Charm and Beauty Production in Fixed-Target Collisions",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:41Z",
  "url": "https://research.draconitic.com/paper/er2zafcr7s4kp",
  "venue": "arXiv",
  "versions": []
}