Locality of the strange sea in the nucleon

We introduce the concept of “locality” for the strange sea in the nucleon, which measures the proximity of the strange and anti-strange quarks in the momentum and coordinate spaces. The CCFR data for the strange and anti-strange distributions imply a “local” strange sea in momentum space, which is unexpected in QCD and is at variance with the simple meson-cloud model where the strangeness is generated from the virtual transition of the nucleon to a hyperon plus a kaon. We present a simple model to interpret the CCFR data and to correlate momentum and coordinate space locality, yielding an upper bound of 0.005 fm2 on the strange radius. We also discuss the significance of locality for other charge-conjugation-odd observables.