Revisiting the large extra dimension effects on $W$-pair production at the LHC in NLO QCD

Abstract

In the framework of the large extra dimensions (LED) model, we investigate the effects induced by the Kaluza-Klein (KK) gravitons up to the QCD next-to-leading order (NLO) on the $W$-pair production followed by a subsequential $W$-decay at the CERN LHC. We depict the regions in the $\mathcal{L}-M_S$ parameter space where the LED effect can and cannot be observed from the analyses of the $pp\to W^{+}{W}^{-}+X$ and $pp\to W^{+}{W}^{-}\to W^{\pm }{l}^{\mp }\stackrel{(-)}{\nu }+X$ processes. We find that the ability of probing the LED effects can be improved by taking the cutoffs for the invariant mass of $W$-pair and the transverse momentum of the final lepton. Our results demonstrate that the NLO QCD corrections to observables are significant, and do not show any improvement for the renormalization/factorization scale uncertainty on the QCD NLO corrected cross section, because the LO result underestimates the scale dependence.

Comments: 25 pages, 14 figures