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Decay <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>D</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mo>*</mml:mo><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:msup><mml:msup><mml:mrow><mml:mo>ℓ</mml:mo></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:msub><mml:mrow><mml:mi>ν</mml:mi></mml:mrow><mml:mrow><mml:mo>ℓ</mml:mo></mml:mrow…
We study the leptonic and semileptonic $D$-meson decays ($D\ensuremath{\rightarrow}{\mathit{\ensuremath{\ell}}}^{+}{\ensuremath{\nu}}_{\mathit{\ensuremath{\ell}}}$ and $D\ensuremath{\rightarrow}{K}^{(*)}{\mathit{\ensuremath{\ell}}}^{+}{\ensuremath{\nu}}_{\mathit{\ensuremath{\ell}}}$) in the framework of covariant quark model with built-in infrared confinement. We compute the required form factors in the entire kinematical momentum transfer region. The calculated form factors are used to evaluate the branching fractions of these transitions. We …