<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>A</mml:mi></mml:math>dependence of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mfrac><mml:mrow><mml:mi>J</mml:mi></mml:mrow><mml:mrow><mml:mi>ψ</mml:mi></mml:mrow></mml:mfrac></mml:math>production in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>-nucleus collisions at 530 GeV/<i>c</i>

TL;DRAbstract

The $A$ dependence of the cross section for $\frac{J}{\ensuremath{\psi}}$ production was measured in the Feynman-$x$ region $0.1\ensuremath{\le}{x}_{F}\ensuremath{\le}0.8$ with a 530-GeV/c ${\ensuremath{\pi}}^{\ensuremath{-}}$ beam. Thick targets of C, Al, Cu, and Pb were employed. Using the cross-section parametrization $\ensuremath{\sigma}={\ensuremath{\sigma}}_{0}{A}^{\ensuremath{\alpha}}$, we find $\ensuremath{\alpha}=0.85\ifmmode\pm\else\textpm\fi{}0.06$. No statistically significant dependence of $\ensuremath{\alpha}$ on either ${x}_{F}$ or transverse momentum ${p}_{t}$ is observed.

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