{"paper":{"title":"Sensitivity of MAGIX@MESA to BSM effects via Bethe-Heitler pair production","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Aleksandr Pustyntsev, Marc Vanderhaeghen","submitted_at":"2026-05-18T17:49:13Z","abstract_excerpt":"We explore the sensitivity of the upcoming MAGIX experiment at the MESA facility to light Beyond the Standard Model (BSM) mediators in the few to hundred MeV mass range. Utilizing high-intensity electron beams of 55 MeV and 105 MeV on a heavy $^{181}\\text{Ta}$ target, we investigate the production of scalar, pseudoscalar, vector, and axial vector mediators via the Bethe-Heitler process. By optimizing the asymmetric kinematic acceptance of the double-spectrometer setup to enhance the signal over background ratio, we demonstrate that MAGIX can probe mediator-electron couplings down to $\\mathcal{"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.18718","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.18718/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"claim_evidence","ran_at":"2026-05-20T00:01:59.045288Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"26d51ddd5c44e2f4e5cae7c96a4e615f25d97da44099d0c7b717898e69a644c8"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}