{"paper":{"title":"Measurement of the $\\pi K$ atom lifetime and the $\\pi K$ scattering length","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-ex"],"primary_cat":"hep-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, C. Amsler, C. Guaraldo, C. Marinas, D. Drijard, D. Dumitriu, D. Fluerasu, DIRAC Collaboration: B. Adeva, E. Kulish, F. Takeutchi, G. Rappazzo, J. Kluson, J. Martincik, J. Saborido, J. Schacher, J. Smolik, K. Gritsay, K. Okada, L. Afanasyev, L. Kruglova, L. Nemenov, L. Tauscher, M. Chiba, M. Gugiu, M. Hansroul, M. Kobayashi, M. Nikitin, M. Pentia, M. Plo, M. Zhabitsky, O. Gorchakov, P. Chliapnikov, P. Federicova, P. Prusa, P. Zrelov, R. Lednicky, S. Aogaki, S. Horikawa, S. Trusov, T. Cechak, 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":"2017-07-07T14:02:40Z","abstract_excerpt":"After having announced the statistically significant observation (5.6~$\\sigma$) of the new exotic $\\pi K$ atom, the DIRAC experiment at the CERN proton synchrotron presents the measurement of the corresponding atom lifetime, based on the full $\\pi K$ data sample: $\\tau = (5.5^{+5.0}_{-2.8}) \\cdot 10^{-15}s$. By means of a precise relation ($<1\\%$) between atom lifetime and scattering length, the following value for the S-wave isospin-odd $\\pi K$ scattering length $a_0^{-}~=~\\frac{1}{3}(a_{1/2}-a_{3/2})$ has been derived: $\\left|a_0^-\\right| = (0.072^{+0.031}_{-0.020}) M_{\\pi}^{-1}$."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.02184","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"}