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We study the contributions of the non-standard neutrino interactions (NSIs)to the rare meson decays of $K^{+}\to \pi^{+} \nu\bar{\nu}$ and $D^{+}\to\pi^{+} \nu\bar\nu$. We show that both decays could provide strong constraintson the free parameters in the NSIs. We point out that the branching ratio of$D^{+}\to \pi^{+} \nu\bar\nu$ could be at the level of $10^{-8}$.Comment: 7 pages and 2 figures, reference added, version to appear in Phys.  Rev.

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

Nonstandard neutrino interactions in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mi>ν</mml:mi><mml:mover accent="true"><mml:mi>ν</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>D</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mo>→</mml:mo><…

Nonstandard neutrino interactions inK+→π+νν¯andD+→<…