{"paper":{"title":"Measurement of the branching ratio and search for a CP violating asymmetry in the eta -> pi+pi-e+e-(gamma) decay at KLOE","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. Antonelli, A. Denig, A. De Santis, A. Di Domenico, A. Passeri, B. Di Micco, B. Sciascia, C. Bini, C. Bloise, C. Di Donato, C. Gatti, D. Leone, E. De Lucia, E. Graziani, E. Pasqualucci, F. Archilli, F. Bossi, F. Ceradini, F. Crucianelli, F. Murtas, F. Nguyen, F. Perfetto, G. Bencivenni, G. Capon, G. De Zorzi, G. Felici, G. Lanfranchi, G. Venanzoni, G. Xu, J. Lee-Franzini, KLOE collaboration: F. Ambrosino, L. Tortora, M. Antonelli, M. Dreucci, M. Martini, M. Moulson, M. Napolitano, M. Palutan, M. Testa, P. Beltrame, P. Branchini, P. Ciambrone, P. De Simone, P. Franzini, P. Gauzzi, P. Massarotti, P. Santangelo, P. Valente, R. Versaci, S. Bertolucci, S. Bocchetta, S. Fiore, S. Giovannella, S. Meola, S. Miscetti, S. M\\\"uller, T. Capussela, T. Spadaro, V. Patera","submitted_at":"2008-12-28T17:13:26Z","abstract_excerpt":"We have studied the eta->pi+pi-e+e-(gamma) decay using about 1.7 fb^-1 collected by the KLOE experiment at the DAFNE phi-factory. This corresponds to about 72 millions eta mesons produced in phi radiative decays. We have measured the branching ratio, inclusive of radiative effects, with 4% accuracy: BR(eta->pi+pi-e+e-(gamma)) = (26.8 +/- 0.9_Stat. +/- 0.7_Syst.) x 10^-5. We have obtained the first measurement of the CP-odd pipi-ee decay planes angular asymmetry, A_phi = (-0.6 +/- 2.5_Stat. +/- 1.8_Syst.) x 10^-2."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0812.4830","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"}