{"paper":{"title":"First $\\pi K$ atom lifetime and $\\pi K$ scattering length measurements","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"nucl-ex","authors_text":"A. Anania, A. Benelli, A. Dudarev, A. Gorin, A. Kulikov, A. Kuptsov, A. Lamberto, A. Lanaro, A. Penzo, A. Romero Vidal, A. Ryazantsev, A. Sidorov, B. Adeva, C. Amsler, C. Ciocarlan, C. Guaraldo, C. Mari\\~nas, D. Drijard, D. Dumitriu, D. Fluerasu, E. Kulish, F. Takeutchi, G. Rappazzo, J. Kluson, J. Martincik, J. Schacher, J. Smolik, K. Gritsay, K. Okada, L. Afanasyev, L. Kruglova, L. Nemenov, L. Tauscher, M. Chiba, M. Duma, M. Gugiu, M. Hansroul, M. Kobayashi, M. Nikitin, M. Pentia, M. Plo, M. Zhabitsky, O. Gorchakov, P. Chliapnikov, P. Doskarova, P. Prusa, P. Zrelov, R. Lednicky, S.Aogaki, S. Constantinescu, S. Horikawa, S. Sugimoto, S. Trusov, T. Cechak, T. Ponta, T. Trojek, T. Urban, T. Vrba, V.Brekhovskikh, V. Karpukhin, V. Kruglov, V. Olchevskii, V. Rykalin, V. Yazkov, Y. Allkofer, Y. Iwashita, Y. Yoshimura, Z. Hons","submitted_at":"2014-03-04T16:31:22Z","abstract_excerpt":"The results of a search for hydrogen-like atoms consisting of $\\pi^{\\mp}K^{\\pm}$ mesons are presented. Evidence for $\\pi K$ atom production by 24 GeV/c protons from CERN PS interacting with a nickel target has been seen in terms of characteristic $\\pi K$ pairs from their breakup in the same target ($178 \\pm 49$) and from Coulomb final state interaction ($653 \\pm 42$). Using these results the analysis yields a first value for the $\\pi K$ atom lifetime of $\\tau=(2.5_{-1.8}^{+3.0})$ fs and a first model-independent measurement of the S-wave isospin-odd $\\pi K$ scattering length $\\left|a_0^-\\right"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1403.0845","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"}