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In the Standard Model of particle physics, the quarks and anti-quarks havefractional charge equal to $\pm1/3$ or $\pm2/3$ of the electron's charge. Therehas been a large number of experiments searching for fractional charge,isolatable, elementary particles using a variety of methods, including $e^+e^-$collisions using dE/dx ionization energy loss measurements, but no evidence hasbeen found to confirm existence of free fractional charge particles, whichleads to the quark confinement theory. In this paper, a proposal to search forthis kind particles is presented, which is based on the conservation law offour-momentum. Thanks to the CLEOc and BESIII detectors' large coverage, goodparticle identification, precision measurements of tracks' momenta and theirlarge recorded data samples, these features make the scheme feasible inpractice. The advantage of the scheme is independent of any theoretical modelsand sensitive for a small fraction of the quarks transitioning to theunconfinement phase from the confinement phase.

A Novel Scheme to Search for Fractional Charge Particles in Low Energy Accelerator Experiments