Strangeness in the Meson Cloud Model

Abstract

I review progress in calculating strange quark and antiquark distributions of the nucleon using the meson cloud model. This progress parallels that of the meson cloud model, which is now a useful theoretical basis for understanding symmetry breaking in nucleon parton distribution functions. I examine the breaking of symmetries involving strange quarks and antiquarks, including quark - antiquark symmetry in the sea, SU(3) flavour symmetry and SU(6) spin-flavour symmetry.

Comments: 6 pages, 4 figures. Talk given at workshop "Achievements and New Directions in Subatomic Physics: Workshop in honour of Tony Thomas' 60th birthday," CSSM, Adelaide, South Australia, 15 - 19 February 2010.