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Veneziano ghost, modified gluon propagator, and gauge copies in QCD

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Abstract
In this short note, we come back to the recent proposal put forward by Kharzeev and Levin [Phys. Rev. Lett. 114, 242001 (2015)], in which they phenomenologically couple the nonperturbative Veneziano ghost to the perturbative gluon, leading to a modified gluon propagator (the "glost") of the Gribov type, with complex poles. As such, a possible link was made between the QCD topological theta-vacuum (Veneziano ghost) and color confinement (no physically observable gluons). We discuss some subtleties concerning gauge (Becchi-Rouet-Stora-Tuytin) invariance of this proposal, related to the choice of Feynman gauge. We draw particular attention to the incompatibility in the longitudinal sector with available nonperturbative results for the linear covariant gauge. We furthermore provide an example in the Landau gauge of a similar phenomenological vertex that also describes the necessary Veneziano ghost but does not affect the Landau gauge gluon propagator.
Keywords
LATTICE, U(1), LIMIT

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Please use this url to cite or link to this publication:

Chicago
Dudal, David, and MS Guimaraes. 2016. “Veneziano Ghost, Modified Gluon Propagator, and Gauge Copies in QCD.” Physical Review D 93 (8).
APA
Dudal, D., & Guimaraes, M. (2016). Veneziano ghost, modified gluon propagator, and gauge copies in QCD. PHYSICAL REVIEW D, 93(8).
Vancouver
1.
Dudal D, Guimaraes M. Veneziano ghost, modified gluon propagator, and gauge copies in QCD. PHYSICAL REVIEW D. 2016;93(8).
MLA
Dudal, David, and MS Guimaraes. “Veneziano Ghost, Modified Gluon Propagator, and Gauge Copies in QCD.” PHYSICAL REVIEW D 93.8 (2016): n. pag. Print.
@article{7280928,
  abstract     = {In this short note, we come back to the recent proposal put forward by Kharzeev and Levin [Phys. Rev. Lett. 114, 242001 (2015)], in which they phenomenologically couple the nonperturbative Veneziano ghost to the perturbative gluon, leading to a modified gluon propagator (the "glost") of the Gribov type, with complex poles. As such, a possible link was made between the QCD topological theta-vacuum (Veneziano ghost) and color confinement (no physically observable gluons). We discuss some subtleties concerning gauge (Becchi-Rouet-Stora-Tuytin) invariance of this proposal, related to the choice of Feynman gauge. We draw particular attention to the incompatibility in the longitudinal sector with available nonperturbative results for the linear covariant gauge. We furthermore provide an example in the Landau gauge of a similar phenomenological vertex that also describes the necessary Veneziano ghost but does not affect the Landau gauge gluon propagator.},
  articleno    = {085010},
  author       = {Dudal, David and Guimaraes, MS},
  issn         = {2470-0010},
  journal      = {PHYSICAL REVIEW D},
  keywords     = {LATTICE,U(1),LIMIT},
  language     = {eng},
  number       = {8},
  pages        = {6},
  title        = {Veneziano ghost, modified gluon propagator, and gauge copies in QCD},
  url          = {http://dx.doi.org/10.1103/PhysRevD.93.085010},
  volume       = {93},
  year         = {2016},
}

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