Proton Helicity GPDs from Lattice QCD
arxiv(2024)
摘要
First lattice QCD calculations of x-dependent GPD have been performed in
the (symmetric) Breit frame, where the momentum transfer is evenly divided
between the initial and final hadron states. However, employing the asymmetric
frame, we are able to obtain proton GPDs for multiple momentum transfers in a
computationally efficient setup. In these proceedings, we focus on the helicity
twist-2 GPD at zero skewness that gives access to the H GPD. We
will cover the implementation of the asymmetric frame, its comparison to the
Breit frame, and the dependence of the GPD on the squared four-momentum
transfer, -t. The calculation is performed on an N_f = 2+1+1 ensemble of
twisted mass fermions with a clover improvement. The mass of the pion for this
ensemble is roughly 260 MeV.
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