Abstract:
We suggest the experimental study of as a test to distinguish between the fractionally charged quark (FCQ) model and the integrally charged quark (ICQ) model. We find that the strong dip in cross section at cos θ=−1/3 (θ being the angle between the W− and the proton direction in the W−γ c.m. frame) in the FCQ model is washed away in the ICQ model. Thus the presence or absence of this dip provides a clean test to distinguish these two models above color threshold.