Letter of Intent for KEK Super B Factory Part I: Physics

3/2
ΦfBq
r
0
2.4
2.2
2.0
1.8
1.6
Φ fBs
quad
quad+log
Φ fBd
quad
quad+chlog
Φ (quenched)
fBq
0.0 2.0 4.0 6.0
(r m )
0 π 2
0.0 2.0 4.0 6.0
(r m )
0 π 2
0.0 2.0 4.0 6.0
(r m )
0 π 2
Figure 2.7: Chiral extrapolation of unquenched fB. The plot is for ΦfB
with a Sommer scale r0. Figure from [76].
√
≡ fB mB normalized
second is uncertainty from the chiral extrapolation and the third is from other systematic
errors.
• heavy-to-heavy semileptonic decay. The zero recoil form factor of the semileptonic decay
B → D (∗) lν has been calculated rather precisely using a double-ratio technique [79, 80].
• heavy-to-light semileptonic decay. The B → πℓν form factor has been calculated in
quenched QCD to an accuracy of order 20% [81–84].
These and other recent results have been reviewed at recent conferences [75, 85–87].
References
[1] N. Cabibbo, “Unitary Symmetry And Leptonic Decays,” Phys. Rev. Lett. 10 (1963) 531.
[2] M. Kobayashi and T. Maskawa, “CP Violation In The Renormalizable Theory Of Weak
Interaction,” Prog. Theor. Phys. 49, 652 (1973).
[3] S. L. Glashow, J. Iliopoulos and L. Maiani, “Weak Interactions With Lepton – Hadron
Symmetry,” Phys. Rev. D 2, 1285 (1970).
[4] K. Hagiwara et al. [Particle Data Group Collaboration], “Review Of Particle Physics,”
Phys. Rev. D 66, 010001 (2002).
[5] L. Wolfenstein, “Parametrization Of The Kobayashi-Maskawa Matrix,” Phys. Rev. Lett.
51, 1945 (1983).
[6] M. Battaglia et al., “The CKM matrix and the unitarity triangle,” Proceedings of the
First Workshop on the CKM Unitarity Triangle, CERN 13-16 February 2002; arXiv:hepph/0304132.
[7] K. G. Wilson, “Nonlagrangian Models Of Current Algebra,” Phys. Rev. 179 (1969) 1499.
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