{"paper":{"title":"$B \\to \\pi l\\bar{\\nu}$ Form Factors with NRQCD Heavy Quark and Clover Light Quark Actions","license":"","headline":"","cross_cats":[],"primary_cat":"hep-lat","authors_text":"A. Ukawa, JLQCD Collaboration: S. Aoki, K-I. Ishikawa, K. Kanaya, M. Fukugita, M. Okawa, N. Ishizuka, N. Tsutsui, N. Yamada, S. Hashimoto, S. Kaya, S. Tominaga, T. Kaneda, T. Onogi, T. Yoshi\\'e, Y. Iwasaki, Y. Kuramashi","submitted_at":"1999-11-29T01:37:33Z","abstract_excerpt":"We report results on semileptonic $B\\to\\pi l\\bar{\\nu}$ decay form factors near $q^2_{\\rm max}$ using NRQCD heavy quark and clover light quark actions and currents improved through $O(\\alpha a)$. An inconsistency with the soft pion relation $f^0(q^2_{\\rm max})= f_B/f_{\\pi}$ found in a previous work is confirmed, and a possible solution with nonperturbative renormalization is discussed. We find that $f^+(q^2)$ is well described by the $B^*$ pole near $q^2_{\\rm max}$, and its $1/M_B$ scaling is also consistent with the prediction of the pole dominance model."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-lat/9911036","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"}