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Non-perturbative decoupling of massive fermions

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arxiv 2110.13882 v2 pith:EMDABQEI submitted 2021-10-26 hep-lat

Tobias Rindlisbacher , Kari Rummukainen , Ahmed Salami , Kimmo Tuominen This is my paper · ORCID
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keywords fermionsbehaviourcouplinggaugeinfraredmassivetheorybelow
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SU(2) gauge theory with Nf=24 massless fermions is non-interacting at long distances, i.e. it has an infrared fixed point at vanishing coupling. With massive fermions the fermions are expected to decouple at energy scales below the fermion mass, and the infrared behaviour is that of confining SU(2) pure gauge theory. We demonstrate this behaviour non-perturbatively with lattice Monte Carlo simulations by measuring the gradient flow running coupling.

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