New Color-Octet Vector Boson Revisit

الأصل · EN

Motivated by CDF recent measurements on di-jet invariant mass spectrum where di-jet is associated production with charged leptons (e/μ) and missing energy, we re-examine the previous proposed massive color-octet axial-vector-like boson Zc. Our simulation showed that the di-jet bump around 120-160 GeV can be induced by Zc with effective coupling gZc q q =0.2 gₛ (q represents the quark other than top and gₛ 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/d Mt t, provided that the Zc and top quark coupling is appropriately chosen (gZc t t ≃ 4.5 gZc q q). Our results also showed that the theoretical AFBᵗ as functions of Δy and Mt t can be consistent with data within 1σ and 1.8σ respectively.