A06: Theory Heavy quark physics from lattice QCD - PowerPoint PPT Presentation

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A06: Theory Heavy quark physics from lattice QCD

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Graduate School of Pure and Applied Sciences. University of Tsukuba ... decay constant of charm-strange meson has been obtained in the continuum limit of full QCD ... – PowerPoint PPT presentation

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Title: A06: Theory Heavy quark physics from lattice QCD


1
A06 TheoryHeavy quark physics from lattice QCD
  • Sinya AOKI
  • Graduate School of Pure and Applied Sciences
  • University of Tsukuba

Fourth Workshop on Mass Origin and Supersymmetry
Physics March 6-8, 2006, Tsukuba, Japan
2
Introduction
Determination of CKM matrix from experiments
Theoretical (non-perturbative) estimates are
required for these.
Lattice QCD !
3
Problem of lattice QCD for b quark
Methods so far
Research in this project
Aoki-Kuramashi-Tominaga
Aoki-Kayaba-Kuramashi
Aoki-Kayaba-Kuramashi
Aoki-Kayaba-Kuramashi
Aoki-Kuramashi
4
On-shell improvement program for massive quark
Aoki-Kuramashi-Tominaga
Aoki-Kayaba-Kuramashi
5
lattice spacing
continuum limit
Aoki-Kayaba-Kuramashi CP-PACS
6
b quark in our method (quenched QCD)
Aoki-Kuramashi
heavy-heavy meson
7
hyperfine splitting(heavy-heavy)
Vector
Pseudo Scalar
Old
Scalings are better in new method, best in
new(non-perturbative)
8
decay constant (heavy-strange)
Old
Old
New method is as good as old one. Continuum limit
can be taken in new method
9
b quark mass
quark masses can NOT be measured experimentally.
New, from HH
New, from HL
scaling is better in heavy-heavy case HH and HL
seem to agree in the continuum limit
10
Conclusions and Discussions
  • Studied new proposal for bottom as well as charm
    quarks
  • new method works for charm quark
  • decay constant of charm-strange meson has been
    obtained in the continuum limit of full QCD
  • new method also works for bottom quark
  • better than old one in heavy-heavy mesons
  • as good as old one in heavy-light mesons
  • Future works continuum limit of b quark physics
  • meson masses and decay constants, quark mass
  • full QCD(NF 2 and 21) as well as quenched QCD
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