Chiral theory of nucleons and pions in the presence of an external gravitational field
| Autor: | J. Gegelia, Maxim V. Polyakov, Dalibor Djukanovic, H. Alharazin |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Nuclear Theory
High Energy Physics::Lattice Extrapolation FOS: Physical sciences 01 natural sciences Nuclear Theory (nucl-th) Gravitation High Energy Physics - Phenomenology (hep-ph) Pion High Energy Physics - Lattice Gravitational field Lattice (order) 0103 physical sciences ddc:530 010306 general physics Nuclear Experiment Physics 010308 nuclear & particles physics High Energy Physics - Lattice (hep-lat) Observable High Energy Physics - Phenomenology Amplitude Quantum electrodynamics Nucleon |
| Zdroj: | Physical review / D 102(7), 076023 (2020). doi:10.1103/PhysRevD.102.076023 Physical Review |
| DOI: | 10.15120/gsi-2021-00667 |
| Popis: | We extend the standard second order effective chiral Lagrangian of pions and nucleons by considering the coupling to an external gravitational field. As an application we calculate one-loop corrections to the one-nucleon matrix element of the energy-momentum tensor to fourth order in chiral counting, and next-to-leading order tree-level amplitude of the pion-production in an external gravitational field. We discuss the relation of the obtained results to experimentally measurable observables. Our expressions for the chiral corrections to the nucleon gravitational form factors differ from those in the literature. That might require to revisit the chiral extrapolation of the lattice data on the nucleon gravitational form factors obtained in the past. 11 pages |
| Databáze: | OpenAIRE |
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