1998/09/16 by Damir Bečirević, D. Becirevic, Becirevic, D. +15 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-lat #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-lat/9809129
29 pages (LaTeX), 14 Postscript figures
arxiv created 1998/09/16 · openalex publication_date 1998/09/16 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present results for the light meson masses and decay constants as obtained from calculations with the non-perturbatively improved (`Alpha') action and operators on a 243 × 64 lattice at beta = 6.2, in the quenched approximation. The analysis was performed in a way consistent with O(a) improvement. We obtained: reasonable agreement with experiment for the hyperfine splitting; fK=156(17) MeV, fpi =139(22) MeV, fK/fpi = 1.13(4) ; fK*=219(7) MeV, frho =199(15) MeV, fphi =235(4) MeV; fK*T(2 GeV) = 178(10) MeV, frhoT(2 GeV) =165(11) MeV, where fVT is the coupling of the tensor current to the vector mesons; the chiral condensate MS (2 GeV)= - (253 +/- 25 MeV)3. Our results are compared to those obtained with the unimproved Wilson action. We also verified that the free-boson lattice dispersion relation describes our results very accurately for a large range of momenta.