Results on the disconnected contributions for hadron structure

Preprint number: CP3-Origins-2014-37 DNRF90 and DIAS-2014-37
Authors: Constantia Alexandrou (University of Cyprus), Martha Constantinou (University of Cyprus), Vincent Drach (CP3-Origins & DIAS), Kyriakos Hadjiyiannakou (University of Cyprus), Karl Jansen (NIC, DESY), Giannis Koutsou (Cyprus Institute), and Alejandro Vaquero (Cyprus Institute)
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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 σ-terms, isoscalar axial charge and first moments of bare parton distributions for a range of pions masses. In addition we give the σ-terms and the computations are performed using QUDA code implemented on GPUs.