## Search

Now showing items 1-10 of 17

#### Baryon spectrum with $N_f=2+1+1$ twisted mass fermions

(2014-06-17)

The masses of the low lying baryons are evaluated using a total of ten ensembles of dynamical twisted mass fermion gauge configurations. The simulations are performed using two degenerate flavors of light quarks, and a ...

#### First moment of the flavour octet nucleon parton distribution function using lattice QCD

(2015-01-15)

We perform a lattice computation of the flavour octet contribution to the average quark momentum in a nucleon, $\la x\ra^{(8)}_{\mu^2 = 4 \gev^2}$. In particular, we fully take the disconnected contributions into account ...

#### Baryon spectrum using Nf=2+1+1 ensembles of twisted mass fermions

(2014-12-02)

We present results on the masses of the low-lying baryons using ten ensembles of gauge configurations with $N_f =2+1+1$ dynamical twisted mass fermions, at three values of the lattice spacing, spanning a pion mass range ...

#### Light baryon masses with dynamical twisted mass fermions

(2008-03-21)

We present results on the mass of the nucleon and the Delta using two dynamical degenerate twisted mass quarks and the tree-level Symanzik improved gauge action. The evaluation is performed at four quark masses corresponding ...

#### Sigma terms and strangeness content of the nucleon with $Nf=2+1+1$ twisted mass fermions

(2012-11-19)

We investigate excited state contaminations in a direct computation of the nucleon $\sigma$-terms. This is an important source of systematic effects that needs to be controlled besides the light quark mass dependence and ...

#### Evaluation of disconnected contributions using GPUs

(2012-11-01)

We calculate on GPUs the disconnected diagrams associated with the nucleon form factors and moments of generalized parton distributions using Nf=2+1+1 twisted mass fermions. We employ the truncated solver method (TSM) for ...

#### 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 ...

#### Nucleon Structure using lattice QCD

(2013-03-27)

A review of recent nucleon structure calculations within lattice QCD is presented. The nucleon excited states, the axial charge, the isovector momentum fraction and helicity distribution are discussed, assessing the methods ...