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https://hdl.handle.net/2440/113517
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Type: | Journal article |
Title: | Scattering processes and resonances from lattice QCD |
Author: | Briceño, R. Dudek, J. Young, R. |
Citation: | Reviews of Modern Physics, 2018; 90(2):025001-1-025001-38 |
Publisher: | American Physical Society |
Issue Date: | 2018 |
ISSN: | 0034-6861 1539-0756 |
Statement of Responsibility: | Raúl A. Briceño, Jozef J. Dudek, Ross D. Young |
Abstract: | The vast majority of hadrons observed in nature are not stable under the strong interaction; rather they are resonances whose existence is deduced from enhancements in the energy dependence of scattering amplitudes. The study of hadron resonances offers a window into the workings of quantum chromodynamics (QCD) in the low-energy nonperturbative region, and in addition many probes of the limits of the electroweak sector of the standard model consider processes which feature hadron resonances. From a theoretical standpoint, this is a challenging field: the same dynamics that binds quarks and gluons into hadron resonances also controls their decay into lighter hadrons, so a complete approach to QCD is required. Presently, lattice QCD is the only available tool that provides the required nonperturbative evaluation of hadron observables. This article reviews progress in the study of few-hadron reactions in which resonances and bound states appear using lattice QCD techniques. The leading approach is described that takes advantage of the periodic finite spatial volume used in lattice QCD calculations to extract scattering amplitudes from the discrete spectrum of QCD eigenstates in a box. An explanation is given of how from explicit lattice QCD calculations one can rigorously garner information about a variety of resonance properties, including their masses, widths, decay couplings, and form factors. The challenges which currently limit the field are discussed along with the steps being taken to resolve them. |
Rights: | © 2018 American Physical Society |
DOI: | 10.1103/RevModPhys.90.025001 |
Grant ID: | DE-AC05-06OR23177 DE-SC0016952 http://purl.org/au-research/grants/arc/CE1101004 http://purl.org/au-research/grants/arc/FT120100821 http://purl.org/au-research/grants/arc/DP140103067 |
Published version: | http://dx.doi.org/10.1103/revmodphys.90.025001 |
Appears in Collections: | Aurora harvest 3 Physics publications |
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