Breakdown of Nonrelativistic QCD Factorization in Processes Involving Two Quarkonia and its Cure
Autor: | Zhi-Guo He, Bernd A. Kniehl, Xiang-Peng Wang |
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Jazyk: | angličtina |
Rok vydání: | 2018 |
Předmět: | |
Zdroj: | Physical Review Letters Physical review letters 121(17), 172001 (2018). doi:10.1103/PhysRevLett.121.172001 |
Popis: | 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. As phenomenologically important examples, we consider the decay ϒ→χcJ+X via bb¯(P3Jb[8])→cc¯(P3J[1])+gg and the production process e+e−→J/ψ+χcJ+X via e+e−→cc¯(P3J1[8])+cc¯(P3J[1])+g. 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. |
Databáze: | OpenAIRE |
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