The fate of the weakly-bound ψ(2s) in nuclear matter

Durham, J. M. and Adare, A. and Afanasiev, S. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Akimoto, R. and Al-Bataineh, H. and Al-Ta'ani, H. and Alexander, J. and Alfred, M. and Andrews, K. R. and Angerami, A. and Aoki, K. and Apadula, N. and Aphecetche, L. and Appelt, E. and Aramaki, Y. and Armendariz, R. and Aronson, S. H. and Asai, J. and Asano, H. and Aschenauer, E. C. and Atomssa, E. T. and Averbeck, R. and Awes, T. C. and Azmoun, B. and Babintsev, V. and Bai, M. and Bai, X. and Csanád, Máté and Csörgő, Tamás and Imrek, József and Kiss, Árpád and Varga-Kőfaragó, Mónika and Nagy, Márton and Ster, András and Sziklai, János István and Tarján, Péter and Vargyas, Márton and Vértesi, Róbert and Zimányi, József (2014) The fate of the weakly-bound ψ(2s) in nuclear matter. NUCLEAR PHYSICS A, 931. pp. 622-627. ISSN 0375-9474

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Abstract

We present new results of a completed PHENIX analysis of ψ(2s) modification at midrapidity in 200 GeV d+Au collisions. Strong suppression of the ψ(2s) relative to the J/ψ is observed. This difference in suppression is too strong to be explained by breakup effects in the nucleus, due to the short nuclear crossing times at RHIC. Given the observation of long range correlations in p(d)+A collisions at LHC and RHIC, consistent with hydrodynamics, these observations raise interesting questions about the mechanism of ψ(2s) suppression when it is produced in a nuclear target. In 2012, the PHENIX Collaboration installed the FVTX, a silicon tracker that precisely measures muon pair opening angles prior to any multiple scattering in the muon arm absorber, and thus provides an improved dimuon mass resolution. The FVTX allows the ψ(2s) to be separated from the J/ψ at forward and backward rapidity for the first time at RHIC. We present new results on ψ(2s) production in p + p collisions at √s = 510 GeV from the 2013 data set.

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