ψ′ production in Pb–Pb collisions at 158 GeV/nucleon B. Alessandro, C. Alexa, R. Arnaldi, M. Atayan, S. Beolè, V. Boldea, P. Bordalo, G. Borges, J. Castor, B. Chaurand et al. (61 more) Eur. Phys. J. C, 49 2 (2007) 559-567 Published online: 21 November 2006 DOI: 10.1140/epjc/s10052-006-0153-y