Browsing by Author "Petschlies, Marcus"

Now showing items 1-10 of 10

    • Conference Object  

      Calculation of the decay width of decuplet baryons 

      Petschlies, Marcus; Alexandrou, Constantia; Negele, J. W.; Pochinsky, A. V.; Syritsyn, S. S. (Proceedings of Science (PoS), 2015)
      We calculate the coupling constant and decay width of the decuplet to octet baryon transitions in lattice QCD using the transfer matrix method. The transition amplitude is related to the coupling constant and via the Fermi's ...
    • Conference Object  

      Determination of the Δ resonance width from lattice QCD 

      Petschlies, Marcus; Alexandrou, Constantia; Negele, J. W. (Proceedings of Science (PoS), 2013)
      A method suitable for extracting resonance parameters of unstable baryons in lattice QCD is examined. The method is applied to the strong decay of the Δ to a pion-nucleon state, extracting the pND coupling constant and Δ ...
    • Article  

      Determination of Δ-resonance parameters from lattice QCD 

      Petschlies, Marcus; Alexandrou, Constantia; Negele, J. W.; Strelchenko, A.; Tsapalis, Antonios (2013)
      A method suitable for extracting resonance parameters of unstable baryons in lattice QCD is examined. The method is applied to the strong decay of the Δ to a pion-nucleon state, extracting the πNΔ coupling constant and Δ ...
    • Conference Object  

      The electric dipole moment of the neutron from Nf = 2+1+1 twisted mass fermions 

      Petschlies, Marcus; Alexandrou, Constantia; Athenodorou, A.; Constantinou, Martha; Hadjiyiannakou, Kyriakos; Jansen, K.; Koutsou, Giannis; Ottnad, K. (Proceedings of Science (PoS), 2015)
      We extract the neutron electric dipole moment (nEDM) dn on configurations produced with Nf = 2+1+1 twisted mass fermions with lattice spacing of a ≃ 0.082fm and a light quark mass that correpsonds to Mπ ≃ 373 MeV. We do ...
    • Article  

      First physics results at the physical pion mass from Nf=2 Wilson twisted mass fermions at maximal twist 

      Petschlies, Marcus; Abdel-Rehim, A.; Alexandrou, Constantia; Burger, F.; Constantinou, Martha; Dimopoulos, Petros; Frezzotti, R.; Hadjiyiannakou, Kyriakos; Helmes, C.; Jansen, K.; Jost, C.; Kallidonis, Christos; Knippschild, B.; Kostrzewa, B.; Koutsou, Giannis; Liu, L.; Mangin-Brinet, M.; Ottnad, K.; Pientka, G.; Rossi, G. C.; Urbach, C.; Wenger, U.; Werner, M. (2017)
      We present physics results from simulations of QCD using Nf=2 dynamical Wilson twisted mass fermions at the physical value of the pion mass. These simulations are enabled by the addition of the clover term to the twisted ...
    • Article  

      Neutron electric dipole moment using Nf=2+1+1 twisted mass fermions 

      Petschlies, Marcus; Alexandrou, Constantia; Athenodorou, A.; Constantinou, Martha; Hadjiyiannakou, Kyriakos; Jansen, K.; Koutsou, Giannis; Ottnad, K. (2016)
      We evaluate the neutron electric dipole moment |d→N| using lattice QCD techniques. The gauge configurations analyzed are produced by the European Twisted Mass Collaboration using Nf=2+1+1 twisted mass fermions at one value ...
    • Article  

      P -wave ππ scattering and the ρ resonance from lattice QCD 

      Petschlies, Marcus; Alexandrou, Constantia; Leskovec, L.; Meinel, S.; Negele, J.; Paul, S.; Pochinsky, A.; Rendon, G.; Syritsyn, S. (2017)
      We calculate the parameters describing elastic I=1, P-wave ππ scattering using lattice QCD with 2+1 flavors of clover fermions. Our calculation is performed with a pion mass of mπ≈320 MeV and a lattice size of L≈3.6 fm. ...
    • Article  

      Position space method for the nucleon magnetic moment in lattice QCD 

      Petschlies, Marcus; Alexandrou, Constantia; Constantinou, Martha; Koutsou, Giannis; Ottnad, K. (2016)
      The extraction of the magnetic form factor of the nucleon at zero momentum transfer is usually performed by adopting a parametrization for its momentum dependence and fitting the results obtained at finite momenta. We ...
    • Article  

      Study of decuplet baryon resonances from lattice QCD 

      Petschlies, Marcus; Alexandrou, Constantia; Negele, J. W.; Pochinsky, A. V.; Syritsyn, S. N. (2016)
      A lattice QCD study of the strong decay width and coupling constant of decuplet baryons to an octet baryon-pion state is presented. The transfer matrix method is used to obtain the overlap of lattice states with decuplet ...
    • Conference Object  

      A study of the radiative transition ππ → πγ∗ with lattice QCD 

      Petschlies, Marcus; Leskovec, L.; Alexandrou, Constantia; Koutsou, Giannis; Meinel, S.; Negele, J. W.; Paul, S.; Pochinsky, A.; Rendon, G.; Syritsyn, S. (Proceedings of Science (PoS), 2016)
      Lattice QCD calculations of radiative transitions between hadrons have in the past been limited to processes of hadrons stable under the strong interaction. Recently developed methods for 1 → 2 transition matrix elements ...