Showing papers by "Heinrich Leutwyler published in 1990"
TL;DR: In this paper, the transversal and longitudinal two-point functions are calculated up to order (1/L d −2 ) 2, where L = V 1/d is the size of the system and d > 2 is the dimension.
257 citations
TL;DR: In this paper, the decay rate of scalar Higgs bosons was predicted using the hadronic form factors required for the prediction of the decay of the Higgs decay rate, including nonstandard generalizations.
227 citations
TL;DR: In this article, the chiral expansion of the pseudoscalar masses is re-examined, and it is shown that the observed spectrum determines the quark mass ratios mu : md : ms quite accurately.
91 citations
TL;DR: In this paper, the authors consider the correlation function of a three-quark current and analyze both the position of the nucleon pole and its residue as a function of temperature.
82 citations
TL;DR: In this article, the authors present a complete theoretical analysis of the decay amplitude K → π H and η → H, where H is a hypothetical light Higgs particle, based on the consistent use of the effective chiral lagrangian technique.
61 citations
TL;DR: In this article, the mean free path for the multipion states produced in heavy ion collisions was analyzed and the observed momentum distributions imply that the gas is far out of chemical equilibrium and rapidly expands both in longitudinal and transverse direction.
43 citations
TL;DR: In this paper, the authors apply this theoretically controlled approach to the 4-dimensional O(4) scalar model and show that the results are in excellent agreement with the predicted finite size scaling forms.
Abstract: Finite volume numerical simulations of scalar models with continuous symmetry face strong finite size effects in the broken phase due to the presence of light Goldstone states. In the region where the light Goldstone bosons dominate the dynamics of the system universal finite size scaling formulae are predicted by chiral perturbation theory. Introducing a finite external source one can determine infinite volume, zero external source physical quantities from finite volume observables. Here we apply this theoretically controlled approach to the 4 dimensionalO(4) scalar model. All of our numerical results are in excellent agreement with the predicted finite size scaling forms. We confirm earlier results at zero external source where the infinite volume limit was approximated by projecting the fields to the direction of the magnetization.
36 citations