Could the gluon contribution to the proton spin be probed?

Abstract

Central pseudoscalar production in $pp$ scattering is suppressed at small values of $Q_{\perp }$. Such a behavior is expected if the production occurs through the fusion of two vectors. We argue that an extension of the experiment could probe the gluon contribution to the proton spin.

6 pages. Talk given at the Quarks'98 conference in Suzdal, Russia, May 1998