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B meson decay constants from two-flavor lattice QCD with nonrelativistic heavy quarks
http://hdl.handle.net/10191/27627
http://hdl.handle.net/10191/27627ec5b284e-6d0f-4152-a749-4df812917a63
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
64_5_054504.pdf (1.8 MB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
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| 公開日 | 2014-06-23 | |||||
| タイトル | ||||||
| タイトル | B meson decay constants from two-flavor lattice QCD with nonrelativistic heavy quarks | |||||
| タイトル | ||||||
| タイトル | B meson decay constants from two-flavor lattice QCD with nonrelativistic heavy quarks | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| 著者 |
Khan, A.Ali
× Khan, A.Ali× Aoki, S.× Burkhalter, R.× Ejiri, S.× Fukugita, M.× Hashimoto, S.× Ishizuka, N.× Iwasaki, Y.× Kanaya, K.× Kaneko, T.× Kuramashi, Y.× Manke, T.× Nagai, K.I.× Okawa, M.× Shanahan, H.P.× Ukawa, A.× Yoshie, T.× CP-PACS, Collaboration |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | We present a study of leptonic B meson decay constants in lattice QCD with two flavors (N f =2) of light dynamical quarks using nonrelativistic QCD for the heavy quark. Gauge configurations are generated with a renormalization-group improved gauge action and a mean-field-improved clover light quark action. Measurements are carried out at two values of β=6/g 2 , each for four sea quark masses, corresponding to inverse lattice spacings a -1 ≈1.3 and 1.8 GeV in the chiral limit of the sea quark. The continuum values of the decay constants are derived by evaluating the discretization errors at each finite lattice spacing. We find f N f =2 B =204(8)(29)(+44) MeV, f N f =2 B s =242(9)(34)(+38) MeV, and f N f =2 B s /f N f =2 B =1.179(18)(23), where the errors listed are statistical, systematic and uncertainty due to choice of the physical quantity used to fix the scale. Comparison is made to quenched results (N f =0) obtained with the same action combination and matching lattice spacings. We find f N f =2 B /f N f =0 B =1.07(5), f N f =2 B s /f N f =0 B s =1.10(5) and (f B s /f B ) N f =2 /(f B s /f B ) N f =0 =1.03(2), which indicate a 5–10 % increase in the values of the decay constants, but no appreciable change in the ratio f B s /f B , due to sea quarks. | |||||
| 書誌情報 |
Physical Review D en : Physical Review D 巻 64, 号 5, p. 054504, 発行日 2001-08 |
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| 出版者 | ||||||
| 出版者 | American Physical Society | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 15507998 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AA00773624 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | info:doi/10.1103/PhysRevD.64.054504 | |||||
| 権利 | ||||||
| 権利情報 | (C) 2001 American Physical Society | |||||
| 著者版フラグ | ||||||
| 値 | publisher | |||||
