Measured J/ψ production cross sections for 200 and 450 GeV/c protons incident on a variety of nuclear targets are analyzed within a Glauber framework which takes into account energy loss of the beam proton, the time delay of particle production due to quantum coherence, and absorption of the J/ψ on nucleons. The best representation is obtained for a coherence time of 0.5 fm/c, previously determined by Drell-Yan production in protonnucleus col lisions, and an absorption cross section of 3.6 mb, which is consistent with the value deduced from photoproduction of the J/ψ on nuclear targets.
|Original language||English (US)|
|Number of pages||6|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - 1999|
Bibliographical noteFunding Information:
The authors gratefully acknowledge discussions with S. Gavin, D. Kharzeev, C. Lourenço, J. Moss, and H. Satz. C.G. thanks the School of Physics and Astronomy at the University of Minnesota for its hospitality during a sabbatical leave. C.G. and J.K. thank the Institute for Nuclear Theory at the University of Washington for its hospitality and the Department of Energy for partial support during the program “Probes of Dense Matter in Ultrarelativistic Heavy Ion Collisions”. This work was also supported by the U.S. Department of Energy under grant DE-FG02-87ER40328, by the Natural Sciences and Engineering Research Council of Canada, by the Fonds FCAR of the Quebec Government, and by the Director, Office of Energy Research, Office of High Energy and Nuclear Physics, Division of Nuclear Physics, of the U.S. Department of Energy under Contract No. DE-AC03-76SF00098 and DE-FG03-93ER40792.