标题： LHCb上超周边PbPb碰撞中的夸克偶素产生 显示英文标题

标题： Quarkonia production in ultra-peripheral PbPb collisions at LHCb

摘要： 在质心能量为$5.02\,\mathrm{TeV}$的超周边铅-铅碰撞中，研究了相干charmonium产生截面及其比值的测量结果，并且微分截面分别作为快速度和横向动量的函数进行测量。 在周边铅-铅碰撞中，研究了低横向动量下的\jpsi 介子的光致产生，这证实了强子碰撞中的相干\jpsi 产生。 这些最新结果显著改进了先前的测量，并与一些理论预测进行了比较。 显示英文摘要

摘要： Measurements of coherent charmonium production cross sections together with their ratio in ultra-peripheral PbPb collisions are studied at a nucleon-nucleon centre-of-mass energy of $5.02\,\mathrm{TeV}$, the differential cross-sections are measured as a function of rapidity and transverse momentum, separately. The photo-production of \jpsi mesons at low transverse momentum is studied in peripheral PbPb collisions, which confirms coherent \jpsi production in hadronic collisions. These latest results significantly improve previous measurements and are compared with some theoretical predictions.