Abstract
This paper describes the calculation of the next-to-leading order (NLO) QCD corrections to massive color-octet vector boson pair production at hadron colliders. As a concrete framework, a two-site coloron model with an internal parity is chosen, which can be regarded as an effective low-energy approximation of Kaluza-Klein gluon physics in universal extra dimensions. The renormalization procedure involves several subtleties, which are discussed in detail. The impact of the NLO corrections is relatively modest, amounting to a reduction of 11-14% in the total cross-section, but they significantly reduce the scale dependence of the LO result.
Highlights
This paper describes the calculation of the next-to-leading order (NLO) QCD corrections to massive color-octet vector boson pair production at hadron colliders
The production of colored new physics particles at the LHC may be subject to sizeable QCD corrections
There are characteristic versions of these models where the single production of color-octet vector bosons is forbidden by a parity symmetry, such as an exchange symmetry for coloron models and Kaluza-Klein parity for extra dimensional models
Summary
The two-site coloron model is based on an extension of the strong gauge group to the product group SU(3)1 × SU(3), which is broken down to SU(3)C by a non-linear sigma model. [29] with the additional constraint that the two gauge groups have equal coupling strength The latter requirement is a consequence of the P parity, which was not considered in ref. The SM Higgs Yukawa coupling cannot be ignored It leads to mixing between the U3 and first component of the Q3 fields, where the subscript indicates the generation index, see e.g. appendix H of ref. Heavy vector-like quarks are required to enforce the P-parity as an exact symmetry This model can be viewed as a low-energy approximation of the 5-dimensional minimal UED model (mUED) with compactification radius R = M −1, where only the zero modes and first KK excitations are kept as dynamical degrees of freedom. In a more general sense, the two-site symmetric coloron model can be regarded as a low-energy description of any model with massive color-octet vector bosons that are odd under some (approximate) parity
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