Nucleon form factors and moments of generalized parton distributions using $N_f=2+1+1$ twisted mass fermions - INSPIRE

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Nucleon form factors and moments of generalized parton distributions using $N_f=2+1+1$ twisted mass fermions

C. Alexandrou
(
- Cyprus U. and
- Cyprus Inst.
)
,
M. Constantinou
(
- Cyprus U.
)
,
S. Dinter
(
- NIC, Zeuthen and
- DESY, Zeuthen
)
,
V. Drach
(
- NIC, Zeuthen and
- DESY, Zeuthen
)
,
K. Jansen
(
- Cyprus U. and
- NIC, Zeuthen and
- DESY, Zeuthen
)

Mar 24, 2013

22 pages

Published in:

Phys.Rev.D 88 (2013) 1, 014509

Published: Jul 16, 2013

e-Print:

1303.5979 [hep-lat]

DOI:

10.1103/PhysRevD.88.014509

Report number:

DESY-13-053,
SFB-CPP-13-23

View in:

ADS Abstract Service

reference search128 citations

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Abstract: (APS)

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 Nf=2+1+1 ensembles having pion masses of 213 MeV and 373 MeV each at a different value of the lattice spacing. The lattice scale is determined using the nucleon mass computed on a total of 17 Nf=2+1+1 ensembles generated at three values of the lattice spacing, a. The renormalization constants are evaluated nonperturbatively with a perturbative subtraction of O(a2) terms. The moments of the generalized parton distributions are given in the MS¯ scheme at a scale of μ=2 GeV. We compare with recent results obtained using different discretization schemes. The implications on the spin content of the nucleon are also discussed.

Note:

Version accepted for publication in Phys. Rev. D. 23 pages, 27 figures

11.15.Ha
12.38.Gc
12.38.Aw
12.38.-t
14.70.Dj
parton: distribution function
quantum chromodynamics: lattice
quark: mass: twist
quark: flavor: 4
nucleon: generalized parton distribution

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Figures(40)

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