Breakdown of Nonrelativistic QCD Factorization in Processes Involving Two Quarkonia and its Cure

Autor:	Zhi-Guo He, Bernd A. Kniehl, Xiang-Peng Wang
Jazyk:	angličtina
Rok vydání:	2018
Předmět:	Physics Quantum chromodynamics Particle physics 010308 nuclear & particles physics General Physics and Astronomy Order (ring theory) Quarkonium 01 natural sciences Fock space Factorization 0103 physical sciences Effective field theory ddc:530 Gravitational singularity 010306 general physics
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
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bbfff909742821ac1e58efc9e3e4b196 http://repo.scoap3.org/api Zobrazit plný text záznamu