We study inclusive processes involving two heavy quarkonia in nonrelativistic QCD (NRQCD) and demonstrate that, in the presence of two P-wave Fock states, NRQCD factorization breaks down, leaving uncanceled infrared singularities. We infer that such singularities will appear for double quarkonium hadroproduction at next-to-leading order. As a solution to this problem, we introduce to NRQCD effective field theory new types of operators whose quantum corrections absorb these singularities.

2014 – 2018 PhD at Universität Hamburg & DESY, Hamburg, Germany 2011 – 2014 MA at University of Chinese Academy of Sciences, Beijing, China 2007 – 2011 BA at Jilin University, Changchun, China