{"paper":{"title":"Parity Nonconservation in Rb and Sr$^+$ due to Low-Mass Vector Boson","license":"http://creativecommons.org/licenses/by/4.0/","headline":"In rubidium and strontium ions, the relative contribution of a low-mass Z' boson to parity violation grows rapidly with decreasing nuclear charge.","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"G. K. Vong, V. A. Dzuba, V. V. Flambaum","submitted_at":"2025-12-14T23:55:34Z","abstract_excerpt":"We calculate the parity non-conserving (PNC) electric-dipole ($E1$) transition amplitudes for the $5s - 6s$ and $5s - 4d_{3/2}$ transitions in Rb and Sr$^+$. Our results include both the nuclear-spin-independent and nuclear-spin-dependent contributions, with particular emphasis on the potential effects of a hypothetical additional $Z'$-boson. We highlight possible advantages of using light atoms in searches for such new interaction. The ratio of the contribution of a low mass $Z'$-boson to the contribution of the Standard model $Z$ -boson to PNC effects increases rapidly (faster than $1/Z^2$) "},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"The ratio of the contribution of a low mass Z'-boson to the contribution of the Standard model Z-boson to PNC effects increases rapidly (faster than 1/Z^2) with decreasing nuclear charge Z.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The hypothetical low-mass Z' boson exists and couples to electrons and nucleons in a manner that produces an additional parity-violating interaction whose strength and range are not constrained by other data.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"The relative contribution of a hypothetical low-mass Z' boson to parity nonconservation in Rb and Sr+ increases faster than 1/Z² with decreasing nuclear charge Z, highlighting advantages of light atoms for new physics searches.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"In rubidium and strontium ions, the relative contribution of a low-mass Z' boson to parity violation grows rapidly with decreasing nuclear charge.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"13aa22c7f4adf5d19b073ef3d0efe05ce7d644323374ebcf995c4726e93df0d6"},"source":{"id":"2512.12882","kind":"arxiv","version":4},"verdict":{"id":"912a8341-4032-4dc6-97ab-8fcf5a14a9bb","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-16T22:10:51.453566Z","strongest_claim":"The ratio of the contribution of a low mass Z'-boson to the contribution of the Standard model Z-boson to PNC effects increases rapidly (faster than 1/Z^2) with decreasing nuclear charge Z.","one_line_summary":"The relative contribution of a hypothetical low-mass Z' boson to parity nonconservation in Rb and Sr+ increases faster than 1/Z² with decreasing nuclear charge Z, highlighting advantages of light atoms for new physics searches.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The hypothetical low-mass Z' boson exists and couples to electrons and nucleons in a manner that produces an additional parity-violating interaction whose strength and range are not constrained by other data.","pith_extraction_headline":"In rubidium and strontium ions, the relative contribution of a low-mass Z' boson to parity violation grows rapidly with decreasing nuclear charge."},"references":{"count":25,"sample":[{"doi":"","year":1991,"title":"I. B. Khriplovich,Parity Nonconservation in Atomic Phenomena(Gordon and Breach, Philadelphia, 1991)","work_id":"69f83a04-3b5a-416b-a1a8-54ff318d42b6","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2004,"title":"J. S. M. Ginges and V. V. Flambaum, Phys. Rep.397, 63 (2004)","work_id":"232e790d-396b-4eea-9e15-d13eb9d23ec1","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2004,"title":"V. F. Dmitriev and I. B. Khriplovich, Phys. Rep.391, 243 (2004)","work_id":"ea4eac04-9a31-408a-9646-dab89af4081b","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2012,"title":"V. A. Dzuba and V. V. Flambaum, Int. J. Mod. Phys. E 21, 1230010 (2012)","work_id":"dd38aeb5-051a-4626-af8f-13be34a41903","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":1989,"title":"V. A. Dzuba, V. V. Flambaum, and O. P. Sushkov, Phys. Lett. A140, 493 (1989)","work_id":"61d7dd4c-02fc-4db7-b6c3-79ea71508aef","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":25,"snapshot_sha256":"bcbd8ef6e6c74e3bb4f9a84d1ac05ebec773df56deeec5d8463cc74d8bd6e93b","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"}