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We demonstrate that a $u-d$ mass difference (which we estimate to be about 4MeV) within quantum loops, can reproduce the effects of the Coleman-Glashowelectromagnetic tadpole operator.Comment: 14 pages, RevTeX. Replacement includes $a_0$ tadpole contribution. To  appear in Phys Rev

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

Electromagnetic properties of hadrons via the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>u</mml:mi><mml:mo>−</mml:mo><mml:mi>d</mml:mi></mml:math>mass difference and direct photon exchange

Electromagnetic properties of hadrons via theu−dmass difference and direct photon exchange