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- W2952386123 abstract "We compute the low lying eigenvalues of the Hermitian Dirac operator in lattice QCD with $N_{rm f} = 2+1+1$ twisted mass fermions. We discuss whether these eigenvalues are in the $epsilon$-regime or the $p$-regime of Wilson chiral perturbation theory ($chi$PT) for twisted mass fermions. Reaching the deep $epsilon$-regime is practically unfeasible with presently typical simulation parameters, but still the few lowest eigenvalues of the employed ensemble evince some characteristic $epsilon$-regime features. With this conclusion in mind, we develop a fitting strategy to extract two low energy constants from analytical $epsilon$-regime predictions at a fixed index. Thus, we obtain results for the chiral condensate and the low energy constant $W_8$. We also discuss how to improve both the theoretical calculation and the lattice computation." @default.
- W2952386123 created "2019-06-27" @default.
- W2952386123 creator A5015748226 @default.
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- W2952386123 date "2016-12-05" @default.
- W2952386123 modified "2023-09-26" @default.
- W2952386123 title "Wilson chiral perturbation theory for dynamical twisted mass fermions vs lattice data - a case study" @default.
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