{"paper":{"title":"Rare decay $\\pi^{0}\\to e^+ e^-$ constraints on the light CP-odd Higgs in NMSSM","license":"http://creativecommons.org/licenses/by/3.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Qin Chang, Ya-Dong Yang","submitted_at":"2008-08-21T14:03:23Z","abstract_excerpt":"We constrain the light CP-odd Higgs $A_{1}^{0}$ in NMSSM via the rare decay $\\pi^{0}\\to e^{+}e^{-}$. It is shown that the possible $3\\sigma$ discrepancy between theoretical predictions and the recent KTeV measurement of ${\\cal B}({\\pi}^{0}\\to e^+ e^-)$ cannot be resolved when the constraints from $\\Upsilon\\to\\gamma A_1^0$, $a_{\\mu}$ and $\\pi^{0}\\to \\gamma \\gamma$ are combined. Furthermore, the combined constraints also exclude the scenario involving $m_{A_1^0}=214.3$ MeV, which is invoked to explain the anomaly in the $\\Sigma^{+}\\to p \\mu^{+}\\mu^{-}$ decay found by the HyperCP Collaboration."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0808.2933","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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"}