## Search

Now showing items 31-40 of 54

#### Topological susceptibility and chiral condensate with $N_f=2+1+1$ dynamical flavors of maximally twisted mass fermions

(2011-11-14)

We study the 'spectral projector' method for the computation of the chiral condensate and the topological susceptibility, using $N_f=2+1+1$ dynamical flavors of maximally twisted mass Wilson fermions. In particular, we ...

#### Strange and charmed baryons using N_f=2 twisted mass QCD

(2010-12-13)

We compute the mass spectrum for strange/charmed baryons in the partially quenched approach using N_f=2 twisted mass QCD configurations. We investigate two main issues: the size of lattice artefacts using three values of ...

#### Dark matter Search and the Scalar Quark Contents of the Nucleon

(2011-11-23)

We present lattice QCD simulation results from the European Twisted Mass Collaboration (ETMC) for the light, strange and charm quark contents of the nucleon. These quantities are important ingredients to estimate the ...

#### Nucleon matrix elements with $N_f=2+1+1$ maximally twisted fermions

(2011-01-28)

We present the first lattice calculation of nucleon matrix elements using four dynamical flavors. We use the $N_f=2+1+1$ maximally twisted mass formulation. The renormalization is performed non-perturbatively in the ...

#### Overlap Valence Quarks on a Twisted Mass Sea

(2010-11-02)

We present the results of an investigation of a mixed action approach of overlap valence and maximally twisted mass sea quarks. Employing a particular matching condition on the pion mass, we analyze the continuum limit ...

#### Low lying baryon spectrum with $N_f = 2+1+1$ dynamical twisted quarks

(2010-12-17)

We present first results on the octet and decuplet strange baryon spectrum with $N_f=2+1+1$ twisted mass quarks. We use an Osterwalder Seiler valence strange quark with a mass tuned to the kaon and compare the results with ...

#### Nucleon scalar matrix elements with $N_f=2+1+1$ twisted mass fermions

(2011-11-21)

We investigate scalar matrix elements of the nucleon using $N_f=2+1+1$ flavors of maximally twisted mass fermions at a fixed value of the lattice spacing of $a\approx 0.078{\rm fm}$. We compute disconnected contributions ...

#### Nucleon form factors and moments of generalized parton distributions using $N_f=2+1+1$ twisted mass fermions

(2013-03-24)

We present results on the axial and the electromagnetic form factors of the nucleon, as well as, on the first moments of the nucleon generalized parton distributions using maximally twisted mass fermions. We analyze two ...

#### Evaluation of disconnected quark loops for hadron structure using GPUs

(2013-09-09)

A number of stochastic methods developed for the calculation of fermion loops are investigated and compared, in particular with respect to their efficiency when implemented on Graphics Processing Units (GPUs). We assess ...

#### Disconnected quark loop contributions to nucleon observables in lattice QCD

(2013-10-23)

We perform a high statistics calculation of disconnected fermion loops on Graphics Processing Units for a range of nucleon matrix elements extracted using lattice QCD. The isoscalar electromagnetic and axial vector form ...