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American University in Cairo, New Cairo 11835, Egypt.
Texas A&M University, College Station, Texas 77843.
Phys Rev Lett. 2024 Aug 2;133(5):052301. doi: 10.1103/PhysRevLett.133.052301.
We report a measurement of exclusive J/ψ and ψ(2s) photoproduction in Au+Au ultraperipheral collisions at sqrt[s_{NN}]=200 GeV using the STAR detector. For the first time, (i) the ψ(2s) photoproduction in midrapidity at the Relativistic Heavy-Ion Collider has been experimentally measured; (ii) nuclear suppression factors are measured for both the coherent and incoherent J/ψ production. At average photon-nucleon center-of-mass energy of 25.0 GeV, the coherent and incoherent J/ψ cross sections of Au nuclei are found to be 71±10% and 36±7%, respectively, of that of free protons. The stronger suppression observed in the incoherent production provides a new experimental handle to study the initial-state parton density in heavy nuclei. Data are compared with theoretical models quantitatively.
我们报告了利用STAR探测器在(\sqrt{s_{NN}} = 200)GeV的金金超外围碰撞中对专属(J/\psi)和(\psi(2S))光生反应的测量。首次实现了：（i）在相对论重离子对撞机上对中快度区域的(\psi(2S))光生反应进行了实验测量；（ii）测量了相干和非相干(J/\psi)产生的核抑制因子。在平均光子 - 核子质心能量为25.0GeV时，发现金核的相干和非相干(J/\psi)截面分别为自由质子截面的71±10%和36±7%。在非相干产生中观察到的更强抑制为研究重核中的初态部分子密度提供了新的实验手段。数据与理论模型进行了定量比较。
