The study of the contribution of the LHT model to image coupling Original Research Article

In the framework of the Littlest Higgs model with T-parity (LHT), we study the contributions of the new particles to image couplings at one-loop level. Based on these results, we further study the branching ratio image and the unpolarized forward–backward asymmetry image. We find that the correction of the new particles to image couplings is mainly on the left-handed coupling and has small part of the parameter space to alleviate the deviation between theoretical predictions and experimental values. The precision measurement value of image can give severe constraints on the relevant parameters. The constraints from the precision measurement value of image are very weak.