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Paper detail

The pion mass in finite volume

We determine the relative pion mass shift $M_π(L)/M_π-1$ due to the finite spatial extent $L$ of the box by means of two-flavor chiral perturbation theory and the one-particle Lüscher formula. We use as input the expression for the infinite volume $ππ$ forward scattering amplitude up to next-to-next-to-leading order and can therefore control the convergence of the chiral series. A comparison to the full leading order chiral expression for the pion mass in finite volume allows us to check the size of subleading terms in the large-$L$ expansion.

preprint2003arXivOpen access
Gilberto ColangeloStephan Dürr
hep-phhep-lat
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Gilberto ColangeloStephan Dürr

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