Description:
<jats:p>We investigate the momentum transfer dependence of differential cross
sections <jats:inline-formula><jats:alternatives><jats:tex-math>d\sigma/dt</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>d</mml:mi><mml:mi>σ</mml:mi><mml:mi>/</mml:mi><mml:mi>d</mml:mi><mml:mi>t</mml:mi></mml:mrow></mml:math></jats:alternatives></jats:inline-formula>
in diffractive electroproduction of heavy quarkonia on proton targets.
Model predictions for <jats:inline-formula><jats:alternatives><jats:tex-math>d\sigma/dt</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>d</mml:mi><mml:mi>σ</mml:mi><mml:mi>/</mml:mi><mml:mi>d</mml:mi><mml:mi>t</mml:mi></mml:mrow></mml:math></jats:alternatives></jats:inline-formula>
within the light-front QCD dipole formalism are based on a realistic
model for a proper correlation between the impact parameter
<jats:inline-formula><jats:alternatives><jats:tex-math>\vec b</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mover><mml:mi>b</mml:mi><mml:mo accent="true">⃗</mml:mo></mml:mover></mml:math></jats:alternatives></jats:inline-formula>
of a collision and color dipole orientation
<jats:inline-formula><jats:alternatives><jats:tex-math>\vec r</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mover><mml:mi>r</mml:mi><mml:mo accent="true">⃗</mml:mo></mml:mover></mml:math></jats:alternatives></jats:inline-formula>.
We demonstrate a significance of <jats:inline-formula><jats:alternatives><jats:tex-math>\vec b-\vec r</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mover><mml:mi>b</mml:mi><mml:mo accent="true">⃗</mml:mo></mml:mover><mml:mo>−</mml:mo><mml:mover><mml:mi>r</mml:mi><mml:mo accent="true">⃗</mml:mo></mml:mover></mml:mrow></mml:math></jats:alternatives></jats:inline-formula>
correlation by comparing with a standard simplification
<jats:inline-formula><jats:alternatives><jats:tex-math>\vec{b}\parallel\vec{r}</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mover><mml:mi>b</mml:mi><mml:mo accent="true">⃗</mml:mo></mml:mover><mml:mo>∥</mml:mo><mml:mover><mml:mi>r</mml:mi><mml:mo accent="true">⃗</mml:mo></mml:mover></mml:mrow></mml:math></jats:alternatives></jats:inline-formula>,
frequently used in the literature.</jats:p>