{"paper":{"title":"First measurement of low momentum dielectrons radiated off cold nuclear matter","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"nucl-ex","authors_text":"A. Balanda, A. Belyaev, A. Blanco, A. Dybczak, A. Ierusalimov, A. Ivashkin, A. Kr\\'asa, A. Kugler, A. Kurepin, A. Lebedev, A. Mangiarotti, A. Reshetin, A. Rustamov, A. Sadovsky, A. Schmah, A. Tarantola, B. K\\\"ampfer, B. Michalska, B. Ramstein, B. Spruck, B. W. Kolb, C. M\\\"untz, C. Sturm, C. Wendisch, D. Belver, D. Gonz\\'alez-D\\'iaz, D. Mishra, E. Epple, E. Schwab, F. Guber, F. Krizek, G. Agakishiev, G. Kornakov, H. Kuc, H. Str\\\"obele, H. Tsertos, I. Fr\\\"ohlich, I. Iori, I. Koenig, J. A. Garz\\'on, J. C. Berger-Chen, J. Friese, J. L. Boyard, J. Markert, J. Michel, J. Pietraszko, J. Siebenson, J. Stroth, J. W\\\"ustenfeld, K. G\\\"obel, K. Lapidus, K. Teilab, L. Fabbietti, L. Lopes, L. Maier, L. Naumann, M. B\\\"ohmer, M. Golubeva, M. Gumberidze, M. Jurkovic, M. Lorenz, M. Palka, M. Traxler, M. Weber, O. Fateev, O. Pechenova, P. Cabanelas, P. Finocchiaro, P. Fonte, P. Salabura, P. Tlusty, R. Gernh\\\"auser, R. Holzmann, R. Kotte, R. Kr\\\"ucken, R. Lalik, R. Trebacz, S. Chernenko, S. Lang, S. Spataro, S. Yurevich, T. Galatyuk, T. Heinz, T. Hennino, T. Karavicheva, T. Liu, T. Vasiliev, V. Ladygin, V. Metag, V. Pechenov, V. Wagner, W. Koenig, W. K\\\"uhn, W. Przygoda, Y. C. Pachmayer, Y. Parpottas, Yu. G. Sobolev, Y. Zanevsky","submitted_at":"2012-05-09T09:14:07Z","abstract_excerpt":"We present data on dielectron emission in proton induced reactions on a Nb target at 3.5 GeV kinetic beam energy measured with HADES installed at GSI. The data represent the first high statistics measurement of proton-induced dielectron radiation from cold nuclear matter in a kinematic regime, where strong medium effects are expected. Combined with the good mass resolution of 2%, it is the first measurement sensitive to changes of the spectral functions of vector mesons, as predicted by models for hadrons at rest or small relative momenta. Comparing the e+e invariant mass spectra to elementary"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1205.1918","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"}