{"paper":{"title":"Search for eta-mesic 4He in the dd->3He n pi0 and dd->3He p pi- reactions with the WASA-at-COSY facility","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"9 M. Buescher, A. Bondar, A. Erven, A. Goswami, A. Khoukaz, A. Kupsc, A. Kuzmin, A. Magiera, A. Pyszniak, A. Roy, A. Szczurek, A. Trzcinski, A. Wronska, A. Yamamoto, B. Kamys, B. Klos, B. Lorentz, B. Marianski, B. Shwartz, C.-O. Gullstroem, D. A. Kirillov, D. Lersch, D. Prasuhn, D. Pszczel, E. Czerwinski, E. Perez del Rio, E. Stephan, F. Goldenbaum, F. S. Bergmann, G. Kemmerling, G. Khatri, G. Sterzenbach, H. Bhatt, H. Calen, H. Clement, H. Kleines, H. Ohm, H.-P. Morsch, H. Stockhorst, H. Stroeher, I. Ciepal, I. Schaetti-Ozerianska, J. Ritman, J. Smyrski, J. Stepaniak, J. Zabierowski, J. Zlomanczuk, K. Demmich, K. Foehl, K. Fransson, K. Grigoryev, K. Lalwani, K. Pysz, K. Sitterberg, L. Heijkenskjoeld, L. Jarczyk, M. Bashkanov, M. Berlowski, M. J. Zielinski, M. Skurzok, M. Wolke, M. Zurek, N.G. Kelkar, N. Huesken, N.M. Piskunov, O. Khreptak, O. Rundel, P. Adlarson, P. Fedorets, P. Kulessa, P. Marciniewski, P. Moskal, P. Wuestner, P. Zupranski, R. Engels, R. Maier, R. Stassen, R. Varma, S. Kistryn, S. Sawant, S. Schadmand, T. Johansson, T. Sefzick, T. Skorodko, V. Hejny, V. Serdyuk, V. Sopov, W. Augustyniak, W. Bardan, W. Erven, W. Eyrich, W. Krzemien, Z. Rudy","submitted_at":"2016-11-04T12:15:19Z","abstract_excerpt":"The search for 4He-eta bound states was performed with the WASA-at-COSY facility via the measurement of the excitation function for the dd->3He n pi0 and dd->3He p pi- processes. The beam momentum was varied continuously between 2.127 GeV/c and 2.422 GeV/c, corresponding to the excess energy for the dd->4He eta reaction ranging from Q=-70 MeV to Q=30 MeV. The luminosity was determined based on the dd->3He n reaction and quasi-free proton-proton scattering via dd->pp n_spectator n_spectator reactions. The excitation functions determined independently for the measured reactions do not reveal a s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1611.01348","kind":"arxiv","version":3},"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"}