N. Eicker
University of Wuppertal
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Featured researches published by N. Eicker.
Physical Review D | 2002
D. Dolgov; R.C. Brower; S. Capitani; Patrick Dreher; John W. Negele; Andrew Pochinsky; Dru B. Renner; N. Eicker; Th. Lippert; K. Schilling; Robert G. Edwards; Urs M. Heller
Moments of the quark density, helicity, and transversity distributions are calculated in unquenched lattice QCD. Calculations of proton matrix elements of operators corresponding to these moments through the operator product expansion have been performed on the 16{sup 3} x 32 lattices for Wilson fermions at Beta=5.6 using configurations from the SESAM collaboration and at Beta = 5.5 using configurations from SCRI. One-loop perturbative renormalization corrections are included. At quark masses accessible in present calculations, there is no statistically significant difference between quenched and full QCD results, indicating that the contributions of quark-antiquark excitations from the Dirac Sea are small. Close agreement between calculations with cooled configurations containing essentially only instantons and the full gluon configurations indicates that quark zero modes associated with instantons play a dominant role. Naive linear extrapolation of the full QCD calculation to the physical pion mass yields results inconsistent with experiment. Extrapolation to the chiral limit including the physics of the pion cloud can resolve this discrepancy and the requirements for a definitive chiral extrapolation are described.
Physical Review D | 1998
N. Eicker; P. Lacock; K. Schilling; A. Spitz; U. Glässner; S. Güsken; H. Hoeber; Th. Lippert; Th. Struckmann; P. Ueberholz; J. Viehoff; G. Ritzenhöfer
We present the final analysis of the light and strange hadron spectra from a full QCD lattice simulation with two degenerate dynamical sea quark flavors at
Physics Letters B | 1997
N. Eicker; U. Glässner; S. Güsken; H. Hoeber; P. Lacock; Th. Lippert; G. Ritzenhöfer; K. Schilling; G. Siegert; A. Spitz; P. Ueberholz; J. Viehoff
\ensuremath{\beta}=5.6
Physical Review D | 1999
A. Spitz; H. Hoeber; N. Eicker; S. Güsken; Th. Lippert; K. Schilling; Thorsten Struckmann; P. Ueberholz; J. Viehoff
on a
Physics Letters B | 1996
N. Eicker; U. Glässner; S. Güsken; H. Hoeber; Thomas Lippert; G. Ritzenhöfer; K. Schilling; G. Siegert; A. Spitz; P. Ueberholz; J. Viehoff
{16}^{3}\ifmmode\times\else\texttimes\fi{}32
Computer Physics Communications | 1999
W. Bietenholz; N. Eicker; Andreas Frommer; Th. Lippert; Björn Medeke; K. Schilling; G. Weuffen
lattice. Four sets of sea quark masses corresponding to the range
arXiv: High Energy Physics - Lattice | 1998
Th. Lippert; Gunnar S. Bali; N. Eicker; L. Giusti; U. Glässner; S. Güsken; H. Hoeber; P. Lacock; G. Martinelli; F. Rapuano; G. Ritzenhöfer; K. Schilling; G. Siegert; A. Spitz; P. Ueberholz; J. Viehoff
0.69l~{m}_{\ensuremath{\pi}}{/m}_{\ensuremath{\rho}}l~0.83
Physical Review D | 2001
T. Struckmann; K. Schilling; Gunnar S. Bali; N. Eicker; S. Güsken; Th. Lippert; H. Neff; B. Orth; W. Schroers; J. Viehoff; P. Ueberholz
are investigated. For reference we also ran a quenched simulation at
arXiv: High Energy Physics - Lattice | 2002
N. Eicker; Th. Lippert; B. Orth; K. Schilling
{\ensuremath{\beta}}_{\mathrm{eff}}=6.0,
arXiv: High Energy Physics - Lattice | 1997
L. Conti; N. Eicker; L. Giusti; U. Glässner; S. Güsken; H. Hoeber; Th. Lippert; G. Martinelli; F. Rapuano; G. Ritzenhöfer; K. Schilling; G. Siegert; A. Spitz; J. Viehoff
which is the point of equal lattice spacing,
