Isospin Breaking in the Nucleon Isovector Axial Charge from QCD Sum Rules
| dc.creator | Jin, Xuemin | |
| dc.date | 1996-02-13 | |
| dc.date.accessioned | 2026-07-07T03:58:52Z | |
| dc.date.available | 2026-07-07T03:58:52Z | |
| dc.description | The isospin breaking in the nucleon isovector axial charge, $g_A^3$, are calculated within the external field QCD sum-rule approach. The isospin violations arising from the difference in up and down current quark masses and in up and down quark condensates are included; electromagnetic effects are not considered. We find $δg^3_A/g^3_A \approx (0.5-1.0)\times 10^{-2}$, where $δg^3_A = (g^3_A)_p + (g^3_A)_n$ and $ g^3_A = [(g^3_A)_p - (g^3_A)_n]/2$. Using the Goldberger-Treiman relation, we also obtain an estimate of the isospin breaking in the pion-nucleon coupling constant, $(g_{ppπ_0}-g_{nnπ_0})/g_{NNπ} \approx (2-7) \times 10^{-3}$. | |
| dc.description | 11 pages in RevTeX including one PS figure, uses epsf.sty and rotate.sty (included), uuencoded | |
| dc.identifier | https://arxiv.org/abs/hep-ph/9602298 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/9602298 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/45990 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | Nuclear Theory | |
| dc.title | Isospin Breaking in the Nucleon Isovector Axial Charge from QCD Sum Rules | |
| dc.type | text |