“Bulletin Board”

School of Particles and Accelerator - December 14, 2011

Constraints on Randall-Sundrum model from top-antitop production at the LHC

Dr. Yaser Ayazi from IPM

 Abstract: We study the top pair production cross section at the LHC in the context of Randall-Sundrum model including the Kaluza-Klein (KK) excited gravitons. It is shown that the recent measurement of the cross section of this process at the LHC restricts the parameter space in Randall-Sundrum (RS) model considerably. We show that the coupling parameter ($\frac{k}{\overline{M}_{pl}}$) is excluded by this measurement from $0.03$ to $0.22$ depending on the mass of first KK excited graviton ($m_1$). We also study the effect of KK excitations on the spin correlation of the top pairs. It is shown that the spin asymmetry in $t\bar{t}$ events is sensitive to the RS model parameters with a reasonable choice of model parameters. Time:Wednesday, December 14, 2011, 14:00