TY  - JOUR
AU  - Durr, S.
AU  - Fodor, Z.
AU  - Hoelbling, C.
AU  - Katz, S. D.
AU  - Krieg, S.
AU  - Lellouch, L.
AU  - Lippert, T.
AU  - Metivet, T.
AU  - Portelli, A.
AU  - Szabo, Kalman
AU  - Torrero, C.
AU  - Toth, B. C.
AU  - Varnhorst, L.
TI  - Lattice Computation of the Nucleon Scalar Quark Contents at the Physical Point
JO  - Physical review letters
VL  - 116
IS  - 17
SN  - 1079-7114
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2016-02463
SP  - 172001
PY  - 2016
N1  - arXiv:1510.08013
AB  - We present a QCD calculation of the u, d, and s scalar quark contents of nucleons based on 47 lattice ensembles with Nf=2+1 dynamical sea quarks, 5 lattice spacings down to 0.054 fm, lattice sizes up to 6 fm, and pion masses down to 120 MeV. Using the Feynman-Hellmann theorem, we obtain fNud=0.0405(40)(35) and fNs=0.113(45)(40), which translates into σπN=38(3)(3)  MeV, σsN=105(41)(37)  MeV, and yN=0.20(8)(8) for the sigma terms and the related ratio, where the first errors are statistical and the second errors are systematic. Using isospin relations, we also compute the individual up and down quark contents of the proton and neutron (results in the main text).
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000374965000001
C6  - pmid:27176514
DO  - DOI:10.1103/PhysRevLett.116.172001
UR  - https://juser.fz-juelich.de/record/808953
ER  -