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Semileptonic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mo>→</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mi>π</mml:mi></mml:math>decay in a constituent quark-meson model
We evaluate the form factors describing the exclusive decay $\stackrel{\ensuremath{\rightarrow}}{B}\ensuremath{\pi}l\ensuremath{\nu}$ by using a constituent quark-meson model based on an effective quark-meson Lagrangian. The model allows for an expansion in the pion momenta and we consider terms up to the first order in the pion field derivatives. We compute the leading …