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We study the impact of the four-quark dipenguin operator to the D^0 - \barD^0 mixing. It is shown to contribute to the short distance piece at the sameorder of magnitude as the box diagram.Comment: 9 pages, RevTex, 1 figur

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Dipenguin contribution to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mo>−</mml:mo><mml:mrow><mml:msup><mml:mover><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mi>¯</mml:mi></mml:mrow></mml:mover><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>mixing

Dipenguin contribution toD0−D¯0mixing