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The main challenge in the Standard Model calculation of the mass and widthdifference in the D0-D0bar system is to estimate the size of SU(3) breakingeffects. We prove that D meson mixing occurs in the Standard Model only atsecond order in SU(3) violation. We consider the possibility that phase spaceeffects may be the dominant source of SU(3) breaking. We find that y=(DeltaGamma)/(2Gamma) of the order of one percent is natural in the Standard Model,potentially reducing the sensitivity to new physics of measurements of D mesonmixing.Comment: 18 pages; minor corrections, version to appear in Phys. Rev.

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

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>SU</mml:mi><mml:mo>(</mml:mo><mml:mn>3</mml:mn><mml:mo>)</mml:mo><mml:mn /></mml:math>breaking and<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:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:…

SU(3)breaking andD0−D0