New color-octet vector boson revisited

Motivated by CDF Collaboration recent measurements on di-jet invariant mass spectrum, where di-jet is associated with charged leptons (e/μ) and missing energy, we reexamined the previous proposed massive color-octet axial-vectorlike boson Z_c. Our simulation showed that the di-jet bump around 120-160GeV can be induced by Z_c with effective coupling g _Zcqq̄=0.2g_s (q represents the quark other than top and g_s is the strong coupling constant). Moreover our numerical investigation indicated that the top quark forward-backward asymmetry AFBt can be reproduced without distorting shape of differential cross section dσ/dM_tt̄, provided that the Z_c and top quark coupling is appropriately chosen (gZ_ctt̄ 4.5gZ _cqq̄). Our results also showed that the theoretical AFBt as functions of Δy and M_tt̄ can be consistent with data within 1σ and 1.8σ, respectively.