A HYPOTHETICAL, ATTRACTIVE LONG-RANGE FORCE FROM TWO-GLUON EXCHANGE, AND THE MEASUREMENT OF ρ IN HIGH ENERGY $\bar p p$ ELASTIC SCATTERING

Abstract

The dynamical question is raised of the possible existence of long-range, residual attractive forces between hadrons due to the overall color-neutral exchange of two, massless transverse gluons between their constituents. Such a force between fermionic constituents would behave as 1/R6. We discuss the experiments which measure the real part of the nuclear amplitude, through its interference with the Coulomb amplitude in high energy [Formula: see text] elastic scattering at very small momentum transfers. We show that on-going [Formula: see text] experiments at [Formula: see text] and at 1800 GeV are sensitive to the scattering amplitude from a residual long-range force.