{"paper":{"title":"Measurement of Muon Capture on the Proton to 1% Precision and Determination of the Pseudoscalar Coupling g_P","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"nucl-ex","authors_text":"A. A. Vasilyev, A. A. Vorobyov, A. G. Krivshich, B. Kiburg, B. Lauss, C. Petitjean, D. W. Hertzog, E. M. Maev, F. E. Gray, F. Mulhauser, G. E. Petrov, G. G. Semenchuk, G. N. Schapkin, J. Deutsch, J. Egger, K. M. Crowe, K. R. Lynch, M. A. Soroka, M. E. Vznuzdaev, M. Hildebrandt, O. E. Maev, P. A. Kravtsov, P. Kammel, P. Winter, R. M. Carey, R. Prieels, S. J. Freedman, S. Knaack, S. M. Clayton, T. A. Case, T. Gorringe, T. I. Banks, V. A. Andreev, V. A. Ganzha, V. Tishchenko","submitted_at":"2012-10-24T14:26:15Z","abstract_excerpt":"The MuCap experiment at the Paul Scherrer Institute has measured the rate L_S of muon capture from the singlet state of the muonic hydrogen atom to a precision of 1%. A muon beam was stopped in a time projection chamber filled with 10-bar, ultra-pure hydrogen gas. Cylindrical wire chambers and a segmented scintillator barrel detected electrons from muon decay. L_S is determined from the difference between the mu- disappearance rate in hydrogen and the free muon decay rate. The result is based on the analysis of 1.2 10^10 mu- decays, from which we extract the capture rate L_S = (714.9 +- 5.4(st"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1210.6545","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"}