{"paper":{"title":"Resonances contribution to two-photon exchange effects and possible large forward-backward asymmetry in $e^+ e^- \\rightarrow p \\bar{p}$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Bing-Song Zou, Hai-Qing Zhou","submitted_at":"2011-12-20T09:21:09Z","abstract_excerpt":"The resonances ($\\eta_c,\\chi_{c0,c2}$) contribution to two-photon exchange (TPE) effects in $e^+ e^- \\leftrightarrow p \\bar{p}$ is calculated in a simple hadronic model. The calculation shows the TPE contributions by resonance $\\chi_{c2}$, which are dependent on the unknown phases $\\phi_{E,M}$ of proton's time-like form factors $G_{E,M}$, are much larger than the TPE contributions by non-resonance and are comparable with measurement precision of coming PANDA detector at $\\sqrt{s} \\sim M_{\\chi_{c2}}$ for most $\\phi_{E,M}$."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1112.4615","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"}