Zero temperature string breaking in lattice quantum chromodynamics

Claude Bernard; Thomas DeGrand; Carleton DeTar; Pierre Lacock; Steven Gottlieb; Urs M. Heller; James Hetrick; Kostas Orginos; Doug Toussaint; Robert L. Sugar

doi:10.1103/PhysRevD.64.074509

Zero temperature string breaking in lattice quantum chromodynamics

Claude Bernard, Thomas DeGrand, Carleton DeTar, Pierre Lacock, Steven Gottlieb, Urs M. Heller, James Hetrick, Kostas Orginos, Doug Toussaint, Robert L. Sugar

Physics

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

The separation of a heavy quark and antiquark pair leads to the formation of a tube of flux, or "string," which should break in the presence of light quark-antiquark pairs. This expected zero-temperature phenomenon has proven elusive in simulations of lattice QCD. We study mixing between the string state and the two-meson decay channel in QCD with two flavors of dynamical sea quarks. We confirm that mixing is weak and find that it decreases at level crossing. While our study does not show direct effects of internal quark loops, our results, combined with unitarity, give a clear confirmation of string breaking.

Original language	English (US)
Article number	074509
Journal	Physical Review D
Volume	64
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevD.64.074509
State	Published - 2001

ASJC Scopus subject areas

Nuclear and High Energy Physics

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AU - Bernard, Claude

AU - DeGrand, Thomas

AU - DeTar, Carleton

AU - Lacock, Pierre

AU - Gottlieb, Steven

AU - Heller, Urs M.

AU - Hetrick, James

AU - Orginos, Kostas

AU - Toussaint, Doug

AU - Sugar, Robert L.

PY - 2001

Y1 - 2001

N2 - The separation of a heavy quark and antiquark pair leads to the formation of a tube of flux, or "string," which should break in the presence of light quark-antiquark pairs. This expected zero-temperature phenomenon has proven elusive in simulations of lattice QCD. We study mixing between the string state and the two-meson decay channel in QCD with two flavors of dynamical sea quarks. We confirm that mixing is weak and find that it decreases at level crossing. While our study does not show direct effects of internal quark loops, our results, combined with unitarity, give a clear confirmation of string breaking.

AB - The separation of a heavy quark and antiquark pair leads to the formation of a tube of flux, or "string," which should break in the presence of light quark-antiquark pairs. This expected zero-temperature phenomenon has proven elusive in simulations of lattice QCD. We study mixing between the string state and the two-meson decay channel in QCD with two flavors of dynamical sea quarks. We confirm that mixing is weak and find that it decreases at level crossing. While our study does not show direct effects of internal quark loops, our results, combined with unitarity, give a clear confirmation of string breaking.

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Zero temperature string breaking in lattice quantum chromodynamics

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