{
  "abstract": "We investigate excited-state effects in nucleon sigma-terms in lattice QCD using twisted-mass clover-improved fermion ensembles. We study correlation functions with nucleon and multihadron nucleon-$σ$-meson interpolating operators. The analysis is performed using three gauge ensembles, including one ensemble simulated with two degenerate light, a strange, and a charm quark with quark masses tuned to approximately their physical value. We solve the generalized eigenvalue problem that arises from the matrix of correlators and show that the three-point function for the light sigma-term obtained using the optimal linear combination of interpolating operators has substantially reduced time dependence without loss of statistical precision. We apply Laplace filtering and investigate residual excited-state contributions in the extraction of $σ_{πN}$. Using the same optimal linear combination of correlators as for $σ_{πN}$ for the strange sigma-term we also observe suppressed excited state contributions over an extended range of source--sink time separations. For the charm sigma-term, we observe negligible time dependence within the large statistical uncertainties, and these improvements show no significant effect.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.20362",
  "author_total": 5,
  "authors": [
    {
      "name": "Constantia Alexandrou"
    },
    {
      "name": "Giannis Koutsou"
    },
    {
      "name": "Yan Li"
    },
    {
      "name": "Srijit Paul"
    },
    {
      "name": "Ferenc Pittler"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/amc7sxs1br0n0.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.20362",
  "fulltext_url": null,
  "id": "amc7sxs1br0n0",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.20362",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "hep-lat"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "arxiv",
      "nucl-th"
    ],
    [
      "openalex",
      "3106|Quantum Chromodynamics and Particle Interactions"
    ]
  ],
  "openalex": "W7221984157",
  "pdf_url": "https://arxiv.org/pdf/2610.20362",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-14",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/amc7sxs1br0n0.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:31Z",
      "native_id": "2610.20362",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.20362"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-lat",
      "subfield": "high-energy"
    },
    {
      "field": "physics",
      "origin": "arxiv:nucl-th",
      "subfield": "nuclear"
    }
  ],
  "title": "Excited-State Effects in Nucleon Sigma Terms from a Variational Analysis",
  "title_text": "Excited-State Effects in Nucleon Sigma Terms from a Variational Analysis",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:31Z",
  "url": "https://research.draconitic.com/paper/amc7sxs1br0n0",
  "venue": "arXiv",
  "versions": []
}