EVIDENCE FOR ETA'-PI SPLITTING IN UNQUENCHED LATTICE QCD

Authors
FREZZOTTI R MASETTI M PETRONZIO R
Citation
R. Frezzotti et al., EVIDENCE FOR ETA'-PI SPLITTING IN UNQUENCHED LATTICE QCD, Nuclear physics. B, 480(1-2), 1996, pp. 381-394
Citations number
9
Categorie Soggetti
Physics, Nuclear
Journal title
Nuclear physics. B → ACNP
ISSN journal
05503213
Volume
480
Issue
1-2
Year of publication
1996
Pages
381 - 394
Database
ISI
SICI code
0550-3213(1996)480:1-2<381:EFESIU>2.0.ZU;2-W
Abstract
We perform an extrapolation from negative to positive flavour numbers of full QCD lattice estimates of the eta' mass. The extrapolations are carried out by keeping rho and pi masses at fixed values. We find an eta'-pi splitting which shows a flavour dependence consistent with the Witten-Veneziano formula based on the U(1) anomaly. The quantitative splitting is consistent with the estimates made in the quenched approx imation.