177,241 research outputs found
Hadron spectrum and interquark forces: Results from the MT(C) Collaboration
No full textLaermann E, Altmeyer R, Born KD, Gockeler M, Horsley R. Hadron spectrum and interquark forces: Results from the MT(C) Collaboration. Nucl.Phys.Proc.Suppl. 1992;26:268-271
The pi N sigma term: A Lattice investigation
No full textAltmeyer R, Gockeler M, Horsley R, Laermann E, Schierholz G. The pi N sigma term: A Lattice investigation. 1993
The interquark potential
No full textBorn KD, Altmeyer R, Ibes W, Laermann E, Sommer R. The interquark potential. Nucl.Phys.Proc.Suppl. 1991;20:394-398
Lattice hadron masses at small quark mass
No full textAltmeyer R, Born KD, Ibes WS, Laermann E, Walsh TF. Lattice hadron masses at small quark mass. 1990
The pi N sigma term: An Evaluation using staggered fermions
No full textAltmeyer R, Gockeler M, Horsley R, Laermann E, Schierholz G. The pi N sigma term: An Evaluation using staggered fermions. NUCLEAR PHYSICS B. 1994;34:376-378.A lattice calculation of the piN sigma term is described using dynamical staggered fermions. Preliminary results give a sea term comparable in magnitude to the valence term
The Spin content of the nucleon
No full textAltmeyer R, Gockeler M, Horsley R, Laermann E, Schierholz G. The Spin content of the nucleon. NUCLEAR PHYSICS B. 1993;30:483-486.The fraction of the nucleon spin that is carried by the quarks, DELTASIGMA, is computed in lattice QCD with dynamical staggered fermions. We obtain the value DELTASIGMA = 0.18 +/- 0.02
RENORMALIZATION OF LATTICE CURRENTS AND THE CALCULATION OF DECAY CONSTANTS FOR DYNAMIC STAGGERED FERMIONS
No full textALTMEYER R, BORN KD, GOCKELER M, HORSLEY R, Laermann E, SCHIERHOLZ G. RENORMALIZATION OF LATTICE CURRENTS AND THE CALCULATION OF DECAY CONSTANTS FOR DYNAMIC STAGGERED FERMIONS. NUCLEAR PHYSICS B. 1993:423-426.A numerical calculation of the lattice staggered renormalisation constants at beta = 5.35, m = 0.01 is presented. It is seen that there are considerable non-perturbative effects present. As an application the vector decay constant f(rho) is estimated
The 'Spin' structure of the nucleon: A Lattice investigation
No full textAltmeyer R, Schierholz G, Gockeler M, Horsley R, Laermann E. The 'Spin' structure of the nucleon: A Lattice investigation. INTERNATIONAL JOURNAL OF MODERN PHYSICS C-PHYSICS AND COMPUTERS. 1994;5(02):331-333.We will discuss here an indirect lattice evaluation of the baryon axial singlet current matrix element. This quantity may be related to the fraction of nucleon spin carried by the quarks. The appropriate structure function has recently been measured (EMC experiment). As in this experiment, we find that the quarks do not appear to carry a large component of the nucleon spin
Axial baryonic charge and the spin content of the nucleon: A Lattice investigation
No full textAltmeyer R, Gockeler M, Horsley R, Laermann E, Schierholz G. Axial baryonic charge and the spin content of the nucleon: A Lattice investigation. PHYSICAL REVIEW D. 1994;49(7):R3087-R3090.The axial baryonic charge of the nucleon, DELTASIGMA, which measures the quark fraction of the nucleon spin, is computed in lattice QCD with dynamical staggered fermions. We obtain the value DELTASIGMA=0.18+/-0.02. This suggests that the quark spin is responsible for very little of the nucleon spin
Hadronic coupling constants in lattice QCD
No full textAltmeyer RL, Gockeler M, Horsley R, Laermann E, Schierholz G. Hadronic coupling constants in lattice QCD. Nucl.Phys.Proc.Suppl. 1994;34:373-375.We report on calculations of the hadronic coupling constants g(rhopipi) and g(NNpi) based on lattice QCD with four flavors of dynamical staggered fermions. By computing 2-point and 3-point Green's functions we have been able to determine these coupling constants ab initio from QCD; the results g(rhopipi) = 4.2 +/- 1.8 and g(NNpi) = 14.8 +/- 6 are compatible with the experimental values
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