Lattice NRQCD calculation of the B0-B̅0 mixing parameter BB

Physical Review D 60 巻 9 号 094503-1-094503-10 頁 1999-09-27 発行
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タイトル ( eng )
Lattice NRQCD calculation of the B0-B̅0 mixing parameter BB
作成者
Hashimoto Shoji
Ishikawa Ken-Ichi
Matsufuru Hideo
Onogi Tetsuya
Yamada Norikazu
収録物名
Physical Review D
60
9
開始ページ 094503-1
終了ページ 094503-10
抄録
We present a lattice calculation of the B meson B parameter BB using the NRQCD action. The heavy quark mass dependence is explicitly studied over a mass range between mb and 4mb with the O(1/mQ) and O(1/mQ2) actions. We find that the ratios of lattice matrix elements 〈ONlat〉/〈A0lat〉2 and 〈OSlat〉/〈A0lat〉2, which contribute to BB through mixing, have significant 1/mQ dependence while that of the leading operator 〈OLlat〉/〈A0lat〉2 has little 1/mQ effect. The combined result for BB(mb) has small but nonzero mass dependence, and the BB(mb) becomes smaller by 10% with the 1/mQ correction compared to the static result. Our result in the quenched approximation at β=5.9 is BBd(5 GeV) = 0.75(3)(12), where the first error is statistical and the second is a systematic uncertainty.
言語
英語
資源タイプ 学術雑誌論文
出版者
American Physical Society
発行日 1999-09-27
権利情報
Copyright (c) 1999 The American Physical Society.
出版タイプ Version of Record(出版社版。早期公開を含む)
アクセス権 オープンアクセス
収録物識別子
[ISSN] 1550-7998
[DOI] 10.1103/PhysRevD.60.094503
[NCID] AA00773624
[DOI] http://dx.doi.org/10.1103/PhysRevD.60.094503