{"paper":{"title":"Test beam results with prototypes for the new Cylindrical GEM Inner Tracker of the BESIII experiment","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.ins-det","authors_text":"A. Amoroso, A. Calcaterra, A. Cotta Ramusino, A. Pelosi, A. Rivetti, CY. Leng, D. Bettoni, E. Fioravanti, E. Soldani, E. Tskhadadze, F. Bianchi, F. Cossio, F. De Mori, F. Evangelisti, G. Cibinetto, G. Felici, G. Mezzadri, G. Morello, H. Li, I. Garzia, J. Dong, J. Pellegrino, JY. Chai, L. Fava, L. Lavezzi, L. Yan, M. Alexeev, M. Bertani, M. Capodiferro, M. Destefanis, M. D. Rolo, M. Gatta, M. Greco, M. Maggiora, M. Melchiorri, M. Mignone, M. Savrie', M. Scodeggio, N. Canale, P. Patteri, R. Baldini Ferroli, R. Farinelli, R. Malaguti, R. Wheadon, S. Cerioni, S. Chiozzi, S. Marcello, S. Pacetti, S. Sosio, S. Spataro, S. Verma, V. Carassiti","submitted_at":"2018-03-20T05:50:02Z","abstract_excerpt":"A cylindrical GEM tracker is under construction in order to replace and improve the inner tracking system of the BESIII experiment. Tests with planar chamber prototypes were carried out on the H4 beam line of SPS (CERN) with muons of 150 GeV/c momentum, to evaluate the efficiency and resolution under different working conditions. The obtained efficiency was in the 96 - 98% range. Two complementary algorithms for the position determination were developed: the charge centroid and the micro-TPC methods. With the former, resolutions <100 micron and <200 micron were achieved without and with magnet"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.07263","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"}