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Revisiting the flux tube spectrum of 3d SU(2) lattice gauge theory

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 نشر من قبل Bastian B. Brandt
 تاريخ النشر 2021
  مجال البحث
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 تأليف Bastian B. Brandt




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We perform a high precision measurement of the spectrum of the QCD flux tube in three-dimensional $SU(2)$ gauge theory at multiple lattice spacings. We compare the results at large $qbar{q}$ separations $R$ to the spectrum predicted by the effective string theory, including the leading order boundary term with a non-universal coefficient. We find qualitative agreement with the predictions from the leading order Nambu-Goto string theory down to small values of $R$, while, at the same time, observing the predicted splitting of the second excited state due to the boundary term. On fine lattices and at large $R$ we observe slight deviations from the EST predictions for the first excited state.



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