The standard model contribution to epsilon'/epsilon of the magnetic- and electric-dipole penguin operators Q11 = (g(s)/16pi2) m(s)SBAR sigma(munu) x t(a)Ga(a)muvu) (1 - gamma5) d and Q12 = (eQd/16pi2) m(s)sBAR sigma(muvu) (1 -gamma5) d is discussed. While the electromagnetic penguin Q12 seems to have a vanishingly small matrix element, we find that the gluonic dipole operator Q11 may give a contribution to epsilon'/epsilon comparable to that of other operators so far considered, and should therefore be consistently included in the analysis.
THE RELEVANCE OF THE DIPOLE PENGUIN OPERATORS IN EPSILON'EPSILON
GABRIELLI, Emidio
1994-01-01
Abstract
The standard model contribution to epsilon'/epsilon of the magnetic- and electric-dipole penguin operators Q11 = (g(s)/16pi2) m(s)SBAR sigma(munu) x t(a)Ga(a)muvu) (1 - gamma5) d and Q12 = (eQd/16pi2) m(s)sBAR sigma(muvu) (1 -gamma5) d is discussed. While the electromagnetic penguin Q12 seems to have a vanishingly small matrix element, we find that the gluonic dipole operator Q11 may give a contribution to epsilon'/epsilon comparable to that of other operators so far considered, and should therefore be consistently included in the analysis.File in questo prodotto:
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