What role do strange quarks play in nucleon properties?

Momentum ; Spin ; Mass ; Charge and Current

s

                                  Main goal of G0 

  determine contributions of strange quark sea (s,s) to electromagnetic properties

                                    of the nucleon

                    "strange form factors"

                                     Charge and current:

                           

valence quarks

“non-strange” sea (u, u, d, d) quarks

“strange” sea (s, s) quarks

proton

gluon

u

u

d

u

u

s