Strange nucleon form factors and isoscalar charges with N_f=2+1 O(a)-improved Wilson fermions

2019/11/04 by Djukanovic, Dalibor, Meyer, Harvey, Ottnad, Konstantin +3
#FOS: Physical sciences #High Energy Physics - Lattice (hep-lat)

paper · doi:10.48550/arxiv.1911.01177

Abstract

We report on our calculation of the strange contribution to the vector and axial vector form factors. The strange charge radii, magnetic moment, and axial charge are extracted by model independent z-expansion fits to the Q²-dependence of the respective form factors. Furthermore, the isoscalar contribution to the axial and tensor charge is investigated by combining the calculation of connected and disconnected diagrams. The required renormalization is performed with the Rome-Southampton method. We make use of the CLS N_f=2+1 O(a)-improved Wilson fermion ensembles. Results are reported for pion masses in the range m_π=200-360 MeV and lattice spacings a=0.05-0.086 fm.

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