Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2006-03-29
Phys.Rev.D74:034510,2006
Physics
High Energy Physics
High Energy Physics - Lattice
48 pages, 9 figures; references and comments added
Scientific paper
10.1103/PhysRevD.74.034510
We discuss the implementation and properties of the quenched approximation in the calculation of the left-right, strong penguin contributions (i.e. Q_6) to epsilon'/epsilon. The coefficient of the new chiral logarithm, discovered by Golterman and Pallante, which appears at leading order in quenched chiral perturbation theory is evaluated using both the method proposed by those authors and by an improved approach which is free of power divergent corrections. The result implies a large quenching artifact in the contribution of Q_6 to epsilon'/epsilon. This failure of the quenched approximation affects only the strong penguin operators and so does not affect the Q_8 contribution to epsilon'/epsilon nor Re A_0, Re A_2 and thus the Delta I=1/2 rule at tree level in chiral perturbation theory.
Aubin Christopher
Christ Norman H.
Dawson Chris
Laiho Jack
Li Shiheng
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