Observation of a Coulomb flux tube
Jeff Greensite, Kristian Chung
TL;DR
This paper reports the observation of a Coulomb flux tube in Coulomb gauge, showing an exponential decay of the color electric field transverse to a static quark-antiquark pair, indicating a flux tube structure.
Contribution
It provides the first measurement of the spatial distribution of the Coulomb electric field, revealing a flux tube narrower than the minimal energy flux tube, and proposes a confinement criterion for gauge theories with matter.
Findings
Coulomb flux tube exhibits exponential transverse decay.
Width of Coulomb flux tube is smaller than the minimal energy flux tube.
Proposes a new confinement criterion for gauge theories with matter.
Abstract
In Coulomb gauge there is a longitudinal color electric field associated with a static quark-antiquark pair. We have measured the spatial distribution of this field, and find that it falls off exponentially with transverse distance from a line joining the two quarks. In other words there is a Coulomb flux tube, with a width that is somewhat smaller than that of the minimal energy flux tube associated with the asymptotic string tension. A confinement criterion for gauge theories with matter fields is also proposed.
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