Gluon fragmentation into quarkonium at next-to-leading order using FKS subtraction
| Autor: | Eric Braaten, Pierre Artoisenet |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Physics
Nuclear and High Energy Physics Particle physics 010308 nuclear & particles physics High Energy Physics::Phenomenology Subtraction FOS: Physical sciences Quarkonium 01 natural sciences Gluon Renormalization Dimensional regularization High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) Fragmentation (mass spectrometry) NLO Computations Phase space 0103 physical sciences Fragmentation function lcsh:QC770-798 lcsh:Nuclear and particle physics. Atomic energy. Radioactivity High Energy Physics::Experiment 010306 general physics Nuclear Experiment |
| Zdroj: | Journal of High Energy Physics Journal of High Energy Physics, Vol 2019, Iss 1, Pp 1-45 (2019) |
| Popis: | We present the calculation at next-to-leading order (NLO) in alpha_s of the fragmentation function of a gluon into heavy quarkonium in the color-octet spin-singlet S-wave channel. To calculate the real NLO corrections, we adapt a subtraction scheme introduced by Frixione, Kunszt, and Signer. Ultraviolet and infrared divergences in the real NLO corrections are calculated analytically by evaluating the phase-space integrals of the subtraction terms using dimensional regularization. The subtracted phase-space integrals are then evaluated in 4 space-time dimensions. The divergences in the virtual NLO corrections are also calculated analytically. After renormalization, all the divergences cancel. The NLO corrections significantly increase the fragmentation probability for a gluon into the spin-singlet quarkonium states eta_c and eta_b. 52 pages, 6 figures |
| Databáze: | OpenAIRE |
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