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The recent experimental data on $D^{+}-D^{0}$ and $D^{\ast\, +}-D^{\ast\,0}$mass differences are used as inputs in the QCD sum rules to obtain newestimates on the mass difference of light quarks and on the difference of theircondensates: $m_d -m_u =3\pm 1\, MeV$, $\langle\bar{d}d\rangle-\langle\bar{u}u\rangle = -(2.5\pm 1)\cdot 10^{-3}\langle\bar{u}u\rangle$ (at astandard normalization point, $\mu = 0.5\, GeV$).Comment: 6 pages, TPI-MINN-92/69-T and BUTP-93/

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

Estimates of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>m</mml:mi></mml:mrow><mml:mrow><mml:mi>d</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mo>−</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi>m</mml:mi></mml:mrow><mml:mrow><mml:mi>u</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>〈</mml:mi><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>…

Estimates ofmd−muand〈…