On relation between Parton Branching Approach and CCFM evolution
| Autor: | Lipatov, A. V., Malyshev, M. A., Jung, Hannes |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
jet [quark]
fusion [gluon gluon] density [parton] parton: distribution function associated production [gauge boson] collinear 0 [higher-order] off-shell transverse momentum dependence bottom: production quantum chromodynamics: factorization tree approximation quark: jet CCFM equation higher-order: 0 factorization [quantum chromodynamics] High Energy Physics::Phenomenology higher-order: 1 charm: production production [charm] CERN LHC Coll gluon gluon: fusion gauge boson: associated production evolution equation transverse momentum: factorization factorization [transverse momentum] production [bottom] High Energy Physics::Experiment parton: density distribution function [parton] 1 [higher-order] |
| Zdroj: | 1-15 (2019). doi:10.3204/PUBDB-2020-00195 |
| DOI: | 10.3204/PUBDB-2020-00195 |
| Popis: | Physical review / D D 101(3), 034022 (2020). doi:10.1103/PhysRevD.101.034022 We consider the associated production of electroweak gauge bosons and charm or beauty quark jets at the LHC using the kT-factorization framework. We apply the transverse momentum dependent (TMD) parton distributions in a proton obtained from the parton branching (PB) method as well as from the Catani-Ciafaloni-Fiorani-Marchesini (CCFM) evolution equation. For the PB approach, our prescription merges the standard leading order O(ααs) kT-factorization calculations with several tree-level next-to-leading order O(ααs2) off-shell production amplitudes. For the CCFM scenario, our consideration is based on the O(ααs2) off-shell gluon-gluon fusion subprocess g*g*→Z/W+QQ¯ and some O(ααs2) subprocesses involving quark interactions, taken into account in conventional (collinear) QCD factorization. We find that the W+c and Z+b cross sections, calculated within the PB and CCFM-based schemes with the proper choice of leading and next-to-leading subprocesses, are in good agreement with each other, thus establishing a correspondence between these two scenarios. A comparison with the latest LHC experimental data is given and the necessity for the proper off-shell treatment of the production amplitudes in determination of the parameters of the TMD parton density is demonstrated. Published by Inst.302363, Melville, NY |
| Databáze: | OpenAIRE |
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