Mean Charge of the Light Sea Quarks in the Proton

Abstract

The modified Gottfried sum rule multiplied by 3/2 can be interpreted as the one to measure the mean $I_3$ of the [(quark) - (antiquark)] in the proton . Based on this interpretation we find the sum rule which can be understood as the one to measure the mean charge of the light sea quarks (u,d,s) in the proton, and show that it takes the value 0.23 for the proton and 0.34 for the neutron .

Comments: 7pages, Latex, a discussion concerning the phenomenological saturation of the sum rule is added, published in Prog.Theor.Phys.V.98(1997)749 - 753