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Lattice Matrix Elements and CP Violation in B and K Physics: Status and Outlook.

DE200415006338

Publication Date	2003
Personal Author	Soni, A.
Page Count	30
Abstract	Status of lattice calculations of hadron matrix elements along with CP violation in B and in K systems is reviewed. Lattice has provided useful input which, in conjunction with experimental data, leads to the conclusion that CP-odd phase in the CKM matrix plays the dominant role in the observed asymmetry in B(yields)(psi)K(sub s). It is now quite likely that any beyond the SM, CP-odd, phase will cause only small deviations in B-physics. Search for the effects of the new phase(s) will consequently require very large data samples as well as very precise theoretical predictions. Clean determination of all the angles of the unitarity triangle therefore becomes essential. In this regard B(yields) KD(sup 0) processes play a unique role. Regarding K-decays, remarkable progress made by theory with regard to maintenance of chiral symmetry on the lattice is briefly discussed. First application already provide quantitative information on B(sub K) and the(Delta)I= 1/2 rule. The enhancement in ReA(sub 0) appears to arise solely from tree operators, esp. Q(sub 2); penguin contribution to ReA(sub 0) appears to be very small. However, improved calculations are necessary for(epsilon)(prime)/(epsilon) as there the contributions of QCD penguins and electroweak penguins largely seem to cancel. There are good reasons, though, to believe that these cancellations will not survive improvements that are now underway. Importance of determining the unitarity triangle purely from K-decays is also emphasized.
Keywords	Lattice matrices CP violation Elements Asymmetry Chiral symmetry Hadrons Maintenance Matrix elements Quantum chromodynamics Trees Unitarity B physics KA physics
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Brookhaven National Lab., Upton, NY. Physics Dept.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200418

Lattice Matrix Elements and CP Violation in B and K Physics: Status and Outlook.

Lattice Matrix Elements and CP Violation in B and K Physics: Status and Outlook.
DE200415006338

Publication Date	2003
Personal Author	Soni, A.
Page Count	30
Abstract	Status of lattice calculations of hadron matrix elements along with CP violation in B and in K systems is reviewed. Lattice has provided useful input which, in conjunction with experimental data, leads to the conclusion that CP-odd phase in the CKM matrix plays the dominant role in the observed asymmetry in B(yields)(psi)K(sub s). It is now quite likely that any beyond the SM, CP-odd, phase will cause only small deviations in B-physics. Search for the effects of the new phase(s) will consequently require very large data samples as well as very precise theoretical predictions. Clean determination of all the angles of the unitarity triangle therefore becomes essential. In this regard B(yields) KD(sup 0) processes play a unique role. Regarding K-decays, remarkable progress made by theory with regard to maintenance of chiral symmetry on the lattice is briefly discussed. First application already provide quantitative information on B(sub K) and the(Delta)I= 1/2 rule. The enhancement in ReA(sub 0) appears to arise solely from tree operators, esp. Q(sub 2); penguin contribution to ReA(sub 0) appears to be very small. However, improved calculations are necessary for(epsilon)(prime)/(epsilon) as there the contributions of QCD penguins and electroweak penguins largely seem to cancel. There are good reasons, though, to believe that these cancellations will not survive improvements that are now underway. Importance of determining the unitarity triangle purely from K-decays is also emphasized.
Keywords	Lattice matrices CP violation Elements Asymmetry Chiral symmetry Hadrons Maintenance Matrix elements Quantum chromodynamics Trees Unitarity B physics KA physics
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Brookhaven National Lab., Upton, NY. Physics Dept.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200418