Article

η and η' mesons from lattice QCD.

Physics Department, Columbia University, New York, New York 10027, USA.
Physical Review Letters (impact factor: 7.37). 12/2010; 105(24):241601. pp.241601
Source: PubMed

ABSTRACT The large mass of the ninth pseudoscalar meson, the η', is believed to arise from the combined effects of the axial anomaly and the gauge field topology present in QCD. We report a realistic, 2+1-flavor, lattice QCD calculation of the η and η' masses and mixing which confirms this picture. The physical eigenstates show small octet-singlet mixing with a mixing angle of θ=-14.1(2.8)°. Extrapolation to the physical light quark mass gives, with statistical errors only, mη=573(6) MeV and mη'=947(142) MeV, consistent with the experimental values of 548 and 958 MeV.

0 0
 · 
0 Bookmarks
 · 
29 Views
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.

Keywords

axial anomaly
 
consistent
 
experimental values
 
gauge field topology present
 
large mass
 
mixing angle
 
physical eigenstates
 
physical light quark mass
 
realistic
 

N. H. Christ