-wave effects in heavy quarkonium production in ultraperipheral nuclear collisions
M. Krelina (Czech Technical University in Prague, FNSPE, Břehová 7, 11519 Prague, Czech Republic); J. Nemchik (Czech Technical University in Prague, FNSPE, Břehová 7, 11519 Prague, Czech Republic, Institute of Experimental Physics SAS, Watsonova 47, 04001 Košice, Slovakia)
The -wave admixture in quarkonium wave functions is acquired from the photonlike structure of transition in the light-front frame widely used in the literature. Such a -wave ballast is not justified by any nonrelativistic model for interaction potential and leads to falsified predictions for the cross sections in heavy quarkonium production in ultraperipheral nuclear collisions. We analyze this negative role of -wave contribution by comparing with our previous studies based on a simple non-photon-like “-wave-only” transition in the rest frame.