Implications on the mUED model from the early LHC data on $\ell+\met$ signal

Abstract

Recently the ATLAS and CMS collaborations reported their search for a new heavy gauge boson $W^{\prime }$ with one lepton plus missing transverse momentum. We find that $W^{(2)}$, the second Kaluza-Kelin (KK) state of the $W$ boson in the minimal Universal Extra Dimension (mUED) model, can be a good candidate for this signal, as its branching ratio into $\ell \nu$ is sizable. Moreover, nearly degenerate KK mass spectra in the mUED model yield generically very soft SM particle accompanying $W^{(2)}$ from the subsequent decays of the second KK quarks and gluons. In a hadron collider, this indirect $W^{(2)}$ production is difficult to distinguish from the $W^{(2)}$ single production. The involved strong interactions make it more important than the single production. The early LHC data on $\ell+\met$ signal for 1.1 fb${}^{-1}$ integrated luminosity is shown insufficient to limit our model even with significant indirect production of $W^{(2)}$. However, the results show that the present LHC 5.6 fb${}^{-1}$ data can cover most of the reasonable parameter space of the mUED model.

11 pages, 5 figures

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Cited by in corpus (3)

• Kinematic Cusps with Two Missing Particles II: Cascade Decay Topology
• Constraints on UED from W' searches
• Direct bound on the minimal Universal Extra Dimension model from the $t\bar{t}$ resonance search at the Tevatron