Journal
PHYSICS LETTERS B
Volume 803, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2020.135329
Keywords
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Funding
- U.S. Department of Energy [DE-AC02-76SF00515]
- Agence Nationale de la Recherche [ANR-18-ERC1-0002]
- FCT [UID/FIS/04564/2016, CERN/FIS-COM/0029/2017, SFRH/BPD/40998/2007, SFRH/BPD/109971/2015]
- European Community [RI-283493]
- PRACE-3IP project [FP7 RI312763]
- Fundação para a Ciência e a Tecnologia [CERN/FIS-COM/0029/2017] Funding Source: FCT
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Gauge theory correlators are potentially more singular in the infrared than those in non-gauge theories. We determine the implications that these singularities have on the spectrum of the theory, proving that the appearance of generalised poles implies the existence of on-shell states with fixed mass, but zero norm. For quantum chromodynamics these poles have direct relevance for the confinement of coloured states. Using lattice data for the Landau gauge gluon propagator we subsequently test for the presence of these poles, establishing that the data is indeed consistent with such a component. (C) 2020 The Author(s). Published by Elsevier B.V.
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