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/mu) 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 120-160 GeV can be induced by Z(c) with effective coupling g(Zcq (q) over bar) = 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 A(FB)(t) can be reproduced without distorting shape of differential cross section d sigma/dM(t (t) over bar), provided that the Z(c) and top quark coupling is appropriately chosen (g(Zct ($) over bar) similar or equal to 4.5g(Zcq (q) over bar)). Our results also showed that the theoretical A(FB)(t) as functions of Delta(y) and M-t (t) over bar can be consistent with data within 1 sigma and 1.8 sigma, respectively.