## Search

Now showing items 41-50 of 54

#### 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 ...

#### The quark contents of the nucleon and their implication for dark matter search

(2013-11-24)

We present results concerning the light and strange quark contents of the nucleon using $N_f=2+1+1$ flavours of maximally twisted mass fermions. The corresponding $\sigma$-terms are casting light on the origin of the nucleon ...

#### Nucleon generalized form factors with twisted mass fermions

(2013-12-10)

We present results on the nucleon form factors, momentum fraction and helicity moment for $N_f=2$ and $N_f=2+1+1$ twisted mass fermions for a number of lattice volumes and lattice spacings. First results for a new $N_f=2$ ...

#### Results on the disconnected contributions for hadron structure

(2014-10-31)

We present results on the disconnected contributions to three point functions entering in studies of hadron structure. We use $N_F = 2+1+1$ twisted mass fermions and give a detailed description on the results of the nucleon ...

#### Looking at the gluon moment of the nucleon with dynamical twisted mass fermions

(2013-11-13)

To understand the structure of hadrons it is important to know the PDF of their constituents, the quarks and gluons. In our work we aim to compute the first moment of the gluon PDF $\langle x \rangle_g$ for the nucleon. ...

#### Computation of disconnected contributions to nucleon observables

(2014-01-27)

We compare several methods for computing disconnected fermion loops contributing to nucleon three-point functions. The comparison is carried out using one ensemble of $N_f=2+1+1$ twisted mass fermions with pion mass of 373 ...

#### Computing K and D meson masses with N_f = 2+1+1 twisted mass lattice QCD

(2010-05-12)

We discuss the computation of the mass of the K and D mesons within the framework of N_f = 2+1+1 twisted mass lattice QCD from a technical point of view. These quantities are essential, already at the level of generating ...

#### First results of ETMC simulations with Nf=2+1+1 maximally twisted mass fermions

(2009-11-27)

We present first results from runs performed with Nf=2+1+1 flavours of dynamical twisted mass fermions at maximal twist: a degenerate light doublet and a mass split heavy doublet. An overview of the input parameters and ...

#### Baryon masses with dynamical twisted mass fermions

(2007-10-05)

We present results on the mass of the nucleon and the $\Delta$ using two dynamical degenerate twisted mass quarks. The evaluation is performed at four quark masses corresponding to a pion mass in the range of 690-300 MeV ...

#### Status of ETMC simulations with Nf=2+1+1 twisted mass fermions

(2008-10-21)

We present the status of runs performed in the twisted mass formalism with $N_{\rm f}=2+1+1$ flavours of dynamical fermions: a degenerate light doublet and a mass split heavy doublet. The procedure for tuning to maximal ...