Suppression of the J/ψ nuclear-modification factor has been seen as a trademark signature of final-state effects in large collision systems for decades. In small systems, the nuclear modification was attributed to cold-nuclear-matter effects until the observation of strong differential suppression of the ψ(2S) state in p+A and d+A collisions suggested the presence of final-state effects. Results of J/ψ and ψ(2S) measurements in the dimuon decay channel are presented here for p+p, p+Al, and p+Au collision systems at sNN=200GeV. The results are predominantly shown in the form of the nuclear-modification factor, RpA, the ratio of the ψ(2S) invariant yield per nucleon-nucleon collision in collisions of proton on target nucleus to that in p+p collisions. Measurements of the J/ψ and ψ(2S) nuclear-modification factor are compared with shadowing and transport-model predictions, as well as to complementary measurements at Large Hadron Collider energies.
|Journal||Physical Review C|
|Publication status||Published - 2022 Jun|
Bibliographical noteFunding Information:
This work was supported by Beijing Advanced Innovation Center for Imaging Technology (No. BAICIT-2016001), the National Natural Science Foundation of China (Grand Nos. 61370126, 61672081, 61602237, U1636211, U1636210), National High Technology Research and Development Program of China (No. 2015AA016004), the Fund of the State Key Laboratory of Software Development Environment (No. SKLSDE-2015ZX-16).
© 2022 American Physical Society.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics