Anomalies, symmetries and strangeness content of the proton |
| |
Authors: | J Pasupathy |
| |
Institution: | (1) Center for Theoretical Studies, Indian Institute of Science, 560 012 Bangalore, India |
| |
Abstract: | The matrix elements of the operators of strange quark fieldssГs where Г is 1 orγμγ
5 between a proton state is calculated. The sigma term is found to be ≈ 41 MeV and theSU(3) singlet axial matrix element is found to be ≈ 0.22, both in agreement with experiment. The sigma term is found using the
trace anomaly, while the determination of the axial vector current matrix element is from QCD sum rules. These correspond
to (ie.943-1)≈ 0.12 and for the axial current Δs
≈ −0.12, respectively. The role of the anomalies in maintaining flavor symmetry in the presence of substantial differences
in quark masses is pointed out. This suggests that there is no need to invoke an intrinsic strange quark component in the
proton wave function. |
| |
Keywords: | Strange quark proton |
本文献已被 SpringerLink 等数据库收录! |
|