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Progress in Simulations with Twisted Mass Fermions at the Physical Point

Abstract : In this contribution, results from $N_f=2$ lattice QCD simulations at one lattice spacing using twisted mass fermions with a clover term at the physical pion mass are presented. The mass splitting between charged and neutral pions (including the disconnected contribution) is shown to be around $20(20)~\mathrm{MeV}$. Further, a first measurement using the clover twisted mass action of the average momentum fraction of the pion is given. Finally, an analysis of pseudoscalar meson masses and decay constants is presented involving linear interpolations in strange and charm quark masses. Matching to meson mass ratios allows the calculation of quark mass ratios: $\mu_s/\mu_l=27.63(13)$, $\mu_c/\mu_l=339.6(2.2)$ and $\mu_c/\mu_s=12.29(10)$. From this mass matching the quantities $f_K=153.9(7.5)~\mathrm{MeV}$, $f_D=219(11)~\mathrm{MeV}$, $f_{D_s}=255(12)~\mathrm{MeV}$ and $M_{D_s}=1894(93)~\mathrm{MeV}$ are determined without the application of finite volume or discretization artefact corrections and with errors dominated by a preliminary estimate of the lattice spacing.
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Contributor : Emmanuelle Vernay <>
Submitted on : Monday, December 22, 2014 - 9:21:16 AM
Last modification on : Thursday, November 19, 2020 - 12:59:04 PM

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  • HAL Id : in2p3-01097775, version 1
  • ARXIV : 1411.6842




A. Abdel-Rehim, C. Alexandrou, P. Dimopoulos, R. Frezzotti, K. Jansen, et al.. Progress in Simulations with Twisted Mass Fermions at the Physical Point. 32nd International Symposium on Lattice Field Theory (LATTICE 2014), Jun 2014, New York, United States. pp.119. ⟨in2p3-01097775⟩



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