Constraints on unparticle physics from the $gt\bar t$ anomalous coupling

Understand

We study the impact of unparticle physics to the chromomagnetic dipole moment (CMDM) of the top quark.

• We compute the effect induced by unparticle operators of scalar and vector nature coupled to fermions on the CMDM.
• We find that this dipole moment is sensitive to the scale dimensions $d_u$ of the unparticle and the new couplings of the respective effective operators.
• Using the bounds imposed on the CMDM by low-energy precision and Tevatron measurements we derive indirect limits on the unparticle parameter space.