CALCULATION OF THE PION ELECTROMAGNETIC-MASS DIFFERENCE IN QUANTUM CHROMODYNAMICS

Authors
PIVOVAROV AA
Citation
Aa. Pivovarov, CALCULATION OF THE PION ELECTROMAGNETIC-MASS DIFFERENCE IN QUANTUM CHROMODYNAMICS, Soviet journal of nuclear physics, 54(5), 1991, pp. 878-883
Citations number
30
Categorie Soggetti
Physics, Nuclear","Physics, Particles & Fields
Journal title
Soviet journal of nuclear physics → ACNP
ISSN journal
00385506
Volume
54
Issue
5
Year of publication
1991
Pages
878 - 883
Database
ISI
SICI code
0038-5506(1991)54:5<878:COTPED>2.0.ZU;2-3
Abstract
The pion electromagnetic mass difference is obtained within the framew ork of QCD sum rules in the chiral limit. The theoretical result, DELT A-m(pi) = (m(pi+) - m(pi(0))em = 4.4 +/- 1.1 MeV, is in good agreement with the experimental value (DELTA-m(pi))exp = 4.43 +/- 0.03 MeV. The technique developed here can be used to calculate the electromagnetic mass difference for other members of the pseudoscalar octet and also makes it possible to take into account explicitly corrections due to t he nonzero masses of the quarks.