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Nucleon form factors and moments of generalized parton distributions using $N_f=2+1+1$ twisted mass fermions
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abstract
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 N_f=2+1+1 ensembles having pion masses of 210 MeV and 354 MeV at two values of the lattice spacing. The lattice scale is determined using the nucleon mass computed on a total of 18 N_f=2+1+1 ensembles generated at three values of the lattice spacing, $a$. The renormalization constants are evaluated non-perturbatively with a perturbative subtraction of ${\cal O}(a^2)$-terms. The moments of the generalized parton distributions are given in the $\bar{\rm MS}$ scheme at a scale of $ \mu=2$ GeV. We compare with recent results obtained using different discretization schemes. The implications on the spin content of the nucleon are also discussed.
Forward citations
Cited by 2 Pith papers
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The nucleon unpolarized generalized form factors and Mellin moments up to fourth order
First lattice-QCD extraction of nucleon unpolarized Mellin moments through fourth order at physical pion mass, with GFF Q^{2} dependence and a reconstructed isovector valence PDF.
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Moments of nucleon generalized parton distributions from lattice QCD simulations at physical pion mass
The paper reports the first controlled lattice QCD extraction of the nucleon's second Mellin moments and vector and axial generalized form factors at the physical pion mass.
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