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We study the ratio of $J/\psi$ over minimum bias in $Pb$ $Pb$ collisions atSPS energy. The NA50 data exhibit a sharp turn-over at $E_T \sim 100$ GeV(close to the knee of the $E_T$ distribution) followed by a steady, steepdecrease at larger $E_T$. We show that this behaviour can be explained by thecombined effects of a small decrease of the hadronic $E_T$ in the $J/\psi$event sample (due to the $E_T$ taken by the $J/\psi$ trigger), together withthe sharp decrease of the $E_T$ distributions in this $E_T$ region (tail). Thisphenomenon does not affect the (true) ratio $J/\psi$ over $DY$ (obtained by theNA50 standard analysis), but does affect the one obtained by the so-calledminimum bias analysis. A good agreement is obtained with the data coming fromboth analysis -- as well as with the ratios of $J/\psi$ and $DY$ over minimumbias -- in the whole $E_{T}$ region.Comment: 20 pages, 4 postscript figures One modified equation and one added  table. No modifications in results and figure

physical review. c. nuclear physics/physical review. c, nuclear physics

Why is the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math>suppression enhanced at large transverse energy?

Why is theJ/ψsuppression enhanced at large transverse energy?