Title: Renormalizable extension of the color sector: constraints and collider phenomenology

Speaker: Dr. Arsham Farzinnia (Tsinghua University)

Time: 3:00PM, Mar. 10th (Monday)

Place: Theoretical Physics Division，319

Abstract:

The extended color sector is an integral part of many theories with new dynamics, which attempt to address various unresolved issues of the ordinary standard model. Heavy vector color-octet models including axigluon, topcolor, technicolor with colored technifermions, flavor-universal and chiral coloron, and extra-dimensional models with KK gluons belong to this class of the beyond the standard model theories.

In this talk, the speaker will discuss the minimal renormalizable extension of the standard model color sector, in which the color gauge group is enlarged to SU(3)_{1c} x SU(3)_{2c}, spontaneously broken to the diagonal SU(3)_c subgroup. The ordinary QCD is then identified with this diagonal unbroken gauge group. The formalism predicts the existence of a rich spectrum of new (colored) scalar, fermionic, and vector particles with novel properties.

In particular, the speaker will focus on constraining this model by imposing vacuum stability, tree-level unitarity, electroweak precision measurements, LHC measurements of the 125 GeV scalar, and the LHC heavy Higgs searches. Furthermore, the speaker will discuss the hadron collider production of the heavy vector color-octet at next-to-leading order, which allows for determining the K-factor and the p_T distribution.