{"paper":{"title":"Light flavor-singlet scalars and walking signals in $N_f=8$ QCD on the lattice","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ph"],"primary_cat":"hep-lat","authors_text":"Akihiro Shibata, Ed Bennett, Enrico Rinaldi, Hiroshi Ohki, Kei-ichi Nagai, Kohtaroh Miura, Koichi Yamawaki, Masafumi Kurachi, Takeshi Yamazaki (the LatKMI Collaboration), Tatsumi Aoyama, Toshihide Maskawa, Yasumichi Aoki","submitted_at":"2016-10-22T07:51:31Z","abstract_excerpt":"Based on the highly improved staggered quark action, we perform lattice simulations of $N_f=8$ QCD and confirm our previous observation of a flavor-singlet scalar meson (denoted as $\\sigma$) as light as the pion and various \"walking signals\" through low-lying spectra, with higher statistics, smaller fermion masses $m_f$, and larger volumes. We measure $M_\\pi$, $F_\\pi$, $M_\\rho$, $M_{a_0}$, $M_{a_1}$, $M_{b_1}$, $M_N$, $M_\\sigma$, $F_\\sigma$, $\\langle \\bar{\\psi} \\psi\\rangle$ (both directly and through the GMOR relation), and the string tension. The data are consistent with the spontaneously bro"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.07011","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"}