CHIRAL SYMMETRY AND THE PENGUIN INTERACTION
Journal or Book Title
PHYSICAL REVIEW D
It is shown how the "penguin" interaction, proposed by Shifman, Vainshtein, and Zakharov in the theory of nonleptonic weak decays, is consistent with the constraints of chiral symmetry. For the K-π transition this involves including a diagram which was missed in previous work. The formulas for the K→2π matrix elements are found to be a factor of 2 larger than the original estimates using the vacuum-saturation method. In addition the equivalence of a procedure using a normal-ordered operator and the more standard technique is demonstrated.
Donoghue, JF, "CHIRAL SYMMETRY AND THE PENGUIN INTERACTION" (1984). PHYSICAL REVIEW D. 204.
Retrieved from https://scholarworks.umass.edu/physics_faculty_pubs/204