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 / S., Bertolini; M., Fabbrichesi; Gabrielli, Emidio. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 327:(1994), pp. 136-144. [10.1016/0370-2693(94)91541-5]
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.Pubblicazioni consigliate
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