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非等方格子上での 　クォーク作用の非摂動繰り込み　

非等方格子上での 　クォーク作用の非摂動繰り込み　. 梅田貴士 、大野木哲也、深谷英則（京大基研） 根岸俊輔（京大理）　松古栄夫（ KEK). ２００５年 3 月２７日　 日本物理学会（東京理科大学野田キャンパス）. Motivation. Hadronic matrix elements with high precision. Relativistic quark Fermilab approach, AKT NRQCD Nonperturbtive HQET (Alpha collab.). Our motivation:

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非等方格子上での 　クォーク作用の非摂動繰り込み　

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  1. 非等方格子上での　クォーク作用の非摂動繰り込み　非等方格子上での　クォーク作用の非摂動繰り込み　 梅田貴士、大野木哲也、深谷英則（京大基研） 根岸俊輔（京大理）　松古栄夫（KEK) ２００５年3月２７日　 日本物理学会（東京理科大学野田キャンパス）

  2. Motivation Hadronic matrix elements with high precision • Relativistic quark • Fermilab approach, AKT • NRQCD • Nonperturbtive HQET (Alpha collab.) Our motivation: study the heavy quark action on anisotropic lattice

  3. Why anisotropic lattice ? Anisotropic lattice: ( anisotropy: ) Our expectation: for ,( not necessarily ) mass dep. of parameters in the action are so small. Nonperturbative renormalization techniqe (based on the PCAC relation) is possible.

  4. Parameters we have to tune Quark action on the anisotropic lattice: ( , , ) should be determined. is to control the O(ma) error.

  5. Is mass dependence really small ? • One-loop calc. for , Harada et al. Phys. Rev. D64 (2001) 074501 • Nonperturbative calc. for Matsufuru et al., Phys. Rev. D64(2001)114503 Harada et al., Phys. Rev. D66(2002)014509 • Application to Heavy-light decay constant Matsufuru et al., hep-lat/0209090 Encouraging result for fully O(a) improvement !

  6. Fully nonperturb. O(a) improvement We have to tune ( ) simultaneously. tuning fixed Using Physical isotropic condition (spatial meson mass) (temporal meson mass) vs (=4) with tree-level & Well determined !

  7. Fully nonperturb. O(a) improvement tuning We have to tune ( ) simultaneously. fixed Schrödinger Functional method (PCAC relation)

  8. Fully nonperturb. O(a) improvement Schrödinger Functional method (PCAC relation) boundary C’ Constant Chromo-Electric background field Improvement cond. for boundary C

  9. Fully nonperturb. O(a) improvement Schrödinger Functional method (PCAC relation) • at high beta • consistent with • (mean-field) tree-level • dependence is weak ( only chromo-elect. field is induced ) Well determined !

  10. Fully nonperturb. O(a) improvement We have to tune ( ) simultaneously. fixed tuning (1) Self-dual background field ??

  11. Fully nonperturb. O(a) improvement We have to tune ( ) simultaneously. fixed tuning (2) Constant Chromo-Magnetic background field causes oscillating modes from doublers

  12. Fully nonperturb. O(a) improvement We have to tune ( ) simultaneously. fixed tuning (2) Constant Chromo-Magnetic background field causes oscillating modes from doublers

  13. Fully nonperturb. O(a) improvement (2) Constant Chromo-Magnetic background field (Dirichlet) (Neumann) (Neumann) (Dirichlet)

  14. Summary • Anisotropic lattice is efficient for heavy quark physics in practical. • , can be determined. • could be determined. Outlook • Application to heavy-light matrix elements.  High precision comp. actually possible ? • Extension to dynamical QCD.

  15. Contents Nonperturbative improvement for anisotropic lattice quark action Motivation tree-level improved results Nonperturbative improvement Summary & Outlook

  16. Is mass dependence really small ? • Application to Heavy-light decay constant Matsufuru et al., hep-lat/0209090 Our result vs ALPHA’s result Scaling violation is small ↓ is under control Encouraging result for fully O(a) improvement !

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