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Measurement of Differences Between J/Psi and Psi' Suppression in p-A Collisions

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arxiv nucl-ex/9909007 v3 pith:2QPZETO4 submitted 1999-09-14 nucl-ex

Measurement of Differences Between J/Psi and Psi' Suppression in p-A Collisions

M.J. Leitch , W.M. Lee , M.E. Beddo , C.N. Brown , T.A. Carey , T.H. Chang , W.E. Cooper , C.A. Gagliardi
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G.T. Garvey D.F. Geesaman E.A. Hawker X.C. He L.D. Isenhower D.M. Kaplan S.B. Kaufman D.D. Koetke P.L. McGaughey J.M. Moss B.A. Mueller V. Papavassiliou J.C. Peng G. Petitt P.E. Reimer M.E. Sadler W.E. Sondheim P.W. Stankus R.S. Towell R.E. Tribble M.A. Vasiliev J.C. Webb J.L. Willis G.R. Young
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Measurements of the suppression of the yield per nucleon of J/Psi and Psi' production for 800 GeV/c protons incident on heavy relative to light nuclear targets have been made with very broad coverage in xF and pT. The observed suppression is smallest at xF values of 0.25 and below and increases at larger values of xF. It is also strongest at small pT. Substantial differences between the Psi' and J/Psi are observed for the first time in p-A collisions. The suppression for the Psi' is stronger than that for the J/Psi for xF near zero, but becomes comparable to that for the J/Psi for xF > 0.6.

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