String breaking with 2+1 dynamical fermions using the stochastic LapH method

Koch, Vanessa; Bulava, John; Hörz, Ben; Knechtli, Francesco; Moir, Graham; Morningstar, Colin; Peardon, Mike

doi:10.22323/1.334.0053

“…The avoided level crossing between the ground-and first-excited states is clearly visible and the expected second avoided crossing due to the formation of two static-strange mesons is also evident for the first time. As the distance over which this phenomenon occurs is small, this effect cannot be resolved using only on-axis separations [26]. For distances beyond the string breaking scale, the ground state tends rapidly towards the mass of two non-interacting static-light mesons.…”

Section: )mentioning

confidence: 99%

String breaking by light and strange quarks in QCD

Bulava

¹

,

Hörz

²

,

Knechtli

³

et al. 2019

Self Cite

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The energy spectrum of a system containing a static quark anti-quark pair is computed for a wide range of source separations using lattice QCD with N f = 2 + 1 dynamical flavours. By employing a variational method with a basis including operators resembling both the gluon string and systems of two separated static mesons, the first three energy levels are determined up to and beyond the distance where it is energetically favourable for the vacuum to screen the static sources through light-or strange-quark pair creation, enabling both these screening phenomena to be observed. The separation dependence of the energy spectrum is reliably parameterised over this saturation region with a simple model which can be used as input for subsequent investigations of quarkonia above threshold and heavy-light and heavy-strange coupled-channel meson scattering.

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“…First-principle numerical Monte Carlo simulations of QCD on a space-time lattice represent the most eligible tool for testing (or ruling out) models of confinement, but can also provide "phenomenological" results that can suggest new insights into the mechanism of confinement. Numerical simulations have clearly established the presence of a linear confining potential between a static quark an antiquark for distances larger than 0.5 fm up to infinite distance in SU(3) pure gauge theory, and up to a distance of about 1.4 fm in presence of dynamical quarks, where string breaking should take place [3][4][5][6][7][8]. This long-distance linear potential is naturally associated with the observation of a tube-like structure of the chromoelectric field produced by a static quark-antiquark pair.…”

Section: Introductionmentioning

confidence: 94%

The flux tube profile in full QCD

Baker¹,

Chelnokov²,

Cosmai³

et al. 2021

Preprint

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“…First-principle numerical Monte Carlo simulations of QCD on a space-time lattice represent the most eligible tool for testing (or ruling out) models of confinement, but can also provide "phenomenological" results that can suggest new insights into the mechanism of confinement. Numerical simulations have clearly established the presence of a linear confining potential between a static quark an antiquark for distances larger than 0.5 fm up to infinite distance in SU(3) pure gauge theory, and up to a distance of about 1.4 fm in presence of dynamical quarks, where string breaking should take place [3][4][5][6][7][8]. This long-distance linear potential is naturally associated with the observation of a tube-like structure of the chromoelectric field produced by a static quark-antiquark pair.…”

Section: Introductionmentioning

confidence: 99%