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Dive into the research topics where Marcus Petschlies is active.

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Featured researches published by Marcus Petschlies.


Physical Review Letters | 2011

Two-Flavor QCD Correction to Lepton Magnetic Moments at Leading Order in the Electromagnetic Coupling

Xu Feng; Karl Jansen; Marcus Petschlies; Dru B. Renner

We present a reliable nonperturbative calculation of the QCD correction, at leading order in the electromagnetic coupling, to the anomalous magnetic moment of the electron, muon, and tau leptons using two-flavor lattice QCD. We use multiple lattice spacings, multiple volumes, and a broad range of quark masses to control the continuum, infinite-volume, and chiral limits. We examine the impact of the commonly ignored disconnected diagrams and introduce a modification to the previously used method that results in a well-controlled lattice calculation. We obtain 1.513(43)×10(-12), 5.72(16)×10(-8), and 2.650(54)×10(-6) for the leading-order two-flavor QCD correction to the anomalous magnetic moment of the electron, muon, and tau, respectively, each accurate to better than 3%.


Physical Review D | 2013

Computing the hadronic vacuum polarization function by analytic continuation

Xu Feng; S. Hashimoto; Grit Hotzel; Karl Jansen; Marcus Petschlies; Dru B. Renner

We propose a method to compute the hadronic vacuum polarization function on the lattice at continuous values of photon momenta bridging between the spacelike and timelike regions. We provide two independent demonstrations to show that this method leads to the desired hadronic vacuum polarization function in Minkowski spacetime. We present with the example of the leading-order QCD correction to the muon anomalous magnetic moment that this approach can provide a valuable alternative method for calculations of physical quantities where the hadronic vacuum polarization function enters.


Physical Review D | 2009

Phase structure of thermal lattice QCD with N{sub f}=2 twisted mass Wilson fermions

E.-M. Ilgenfritz; Karl Jansen; Maria Paola Lombardo; M. Müller-Preussker; Marcus Petschlies; Owe Philipsen; Lars Zeidlewicz

We present numerical results for the phase diagram of lattice QCD at finite temperature in the formulation with twisted mass Wilson fermions and a tree-level Symanzik-improved gauge action. Our simulations are performed on lattices with temporal extent N{sub {tau}}=8, and lattice coupling {beta} ranging from strong coupling to the scaling domain. Covering a wide range in the space spanned by the lattice coupling {beta} and the hopping and twisted mass parameters {kappa} and {mu}, respectively, we obtain a comprehensive picture of the rich phase structure of the lattice theory. In particular, we verify the existence of an Aoki phase in the strong coupling region and the realization of the Sharpe-Singleton scenario at intermediate couplings. In the weak coupling region we identify the phase boundary for the physical finite temperature phase transition/crossover. Its shape in the three-dimensional parameter space is consistent with Creutzs conjecture of a cone-shaped thermal transition surface.


arXiv: High Energy Physics - Lattice | 2011

Pseudoscalar Decay Constants from

Carsten Urbach; F. Farchioni; Gregorio Herdoiza; Karl Jansen; Andreas Nube; Marcus Petschlies

We present first results for the pseudoscalar decay constants


arXiv: High Energy Physics - Lattice | 2012

N_f=2+1+1

Xu Feng; Dru B. Renner; Marcus Petschlies; Karl Jansen; Grit Hotzel

f_K


Physical Review D | 2016

twisted mass lattice QCD

Constantia Alexandrou; Martha Constantinou; Giannis Koutsou; Konstantin Ottnad; Marcus Petschlies

,


Physical Review D | 2016

Leading-order hadronic contributions to a_{\mu} and \alpha_{QED} from N_f=2+1+1 twisted mass fermions

Constantia Alexandrou; John W. Negele; Marcus Petschlies; Andrew Pochinsky; Sergey Syritsyn

f_D


arXiv: High Energy Physics - Lattice | 2008

Position space method for the nucleon magnetic moment in lattice QCD

Lars Zeidlewicz; Ernst-Michael Ilgenfritz; Karl Jansen; Maria Paola Lombardo; M. Müller-Preussker; Marcus Petschlies; Owe Philipsen; Andre Sternbeck

and


arXiv: High Energy Physics - Lattice | 2014

Study of decuplet baryon resonances from lattice QCD

Karl Jansen; Dru B. Renner; Marcus Petschlies; S. Hashimoto; Grit Hotzel; Xu Feng

f_{D_s}


arXiv: High Energy Physics - Lattice | 2011

Twisted mass QCD at finite temperature

Marcus Petschlies

from lattice QCD with N_f=2+1+1 flavours of dynamical quarks. The lattice simulations have been performed by the European Twisted Mass collaboration (ETMC) using maximally twisted mass quarks. For the pseudoscalar decay constants we follow a mixed action approach by using so called Osterwalder-Seiler fermions in the valence sector for strange and charm quarks. The data for two values of the lattice spacing and several values of the up/down quark mass is analysed using chiral perturbation theory.

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Dru B. Renner

Thomas Jefferson National Accelerator Facility

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Grit Hotzel

Humboldt University of Berlin

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Andrew Pochinsky

Massachusetts Institute of Technology

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John W. Negele

Massachusetts Institute of Technology

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Sergey Syritsyn

Lawrence Berkeley National Laboratory

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Srijit Paul

University of Wuppertal

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