{"paper":{"title":"Measurement of the energy spectrum of \\nu_e from muon decay and implications for the Lorentz structure of the weak interaction","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"B. A. Bodmann, B.Zeitnitz, C. Eichner, C. Oehler, C. Ruf, E. Finckh, G. Drexlin, H. Gemmeke, I. M. Blair, J. A. Edgington, J. H\\\"o{\\ss}l, J. Kleinfeller, J. Rapp, J. Wolf, KARMEN group: B. Armbruster, K. Eitel, M. Kleifges, M. Steidl, N. E. Booth, O. Stumm, P. J\\\"unger, P. Plischke, R. Maschuw, T. Jannakos, V. Eberhard, W. Kretschmer","submitted_at":"1998-06-24T10:51:54Z","abstract_excerpt":"The KARMEN experiment uses the reaction 12C(\\nu_e,e-)12N to measure the energy distribution of \\nu_e emitted in muon decay at rest. The \\nu_e analog \\omega_l of the famous Michel parameter \\rho has been derived from a maximum-likelihood analysis of events near the kinematic end point, E_max. The result, \\omega_l = (2.7^{+3.8}_{-3.3}\\pm 3.1) * 10^{-2}, is in good agreement with the standard model prediction \\omega_l= 0. We deduce a 90% confidence upper limit of \\omega_l <= 0.113, which corresponds to a limit of |g^S_RL + 2 g^T_RL| <= 0.78 on the interference term between scalar and tensor coupl"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ex/9806024","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":""},"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"}