Inside the SU(3) quark-antiquark QCD flux tube: Screening versus quantum widening

N. Cardoso, M. Cardoso, and P. Bicudo
Phys. Rev. D 88, 054504 – Published 13 September 2013

Abstract

In lattice QCD, color confinement manifests in flux tubes. We compute in detail the quark-antiquark flux tube for pure gauge SU(3) dimension D=3+1 for quark-antiquark distances R ranging from 0.4 to 1.4 fm. To increase the signal-to-noise ratio, we apply the improved multihit and extended smearing techniques. We detail the gauge-invariant squared components of the color electric and color magnetic fields both in the mediator plane between the static quark and static antiquark and in the planes of the charges. We fit the field densities with appropriate Ansätze, and we observe the screening of the color fields in all studied planes together with the quantum widening of the flux tube in the mediator plane. All components squared of the color fields are nonvanishing and are consistent with a penetration length λ0.22 to 0.24 fm and an effective screening mass μ0.8 to 0.9 GeV. The quantum widening of the flux tube is well fitted with a logarithmic law in R.

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  • Received 14 February 2013

DOI:https://doi.org/10.1103/PhysRevD.88.054504

© 2013 American Physical Society

Authors & Affiliations

N. Cardoso*, M. Cardoso, and P. Bicudo

  • Departamento de Física, CFTP, Instituto Superior Técnico, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal

  • *nunocardoso@cftp.ist.utl.pt
  • mjdcc@cftp.ist.utl.pt
  • bicudo@ist.utl.pt

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Issue

Vol. 88, Iss. 5 — 1 September 2013

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