Quark Anomalous Chromomagnetic Moment Bounds - Projection

The statistical limits on detectability of an anomalous chromomagnetic moment of a quark coupling to a gluon are projected to higher luminosities at the Tevatron at Fermilab, and to the LHC. They roughly scale as the energy, and are not strongly improved with increasing lumonisity. New interactions or composite structure can lead to anomalous magnetic moments for electromagnetic interactions and anomalous chromomagnetic moments for colored intermediate states of colored quarks. The form of the interaction is L ef f = g ¯ ψ λ a 2 (−γ µ G a µ + κ ′ 2 σ µν G a µν)ψ (1) It has been shown[1] that these could account for a possible discrepancy between CDF and D0 data and QCD[2, 3], although this can also be accounted for by larger gluon structure functions. Since these same interactions can contribute to the mass of the quarks, they are usually considered to be small for light mass quarks[4, 5], but can be larger for heavier quarks, such as