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Recently the ATLAS and CMS collaborations reported their search for a newheavy gauge boson $W'$ with one lepton plus missing transverse momentum. Wefind that $W^{(2)}$, the second Kaluza-Kelin (KK) state of the $W$ boson in theminimal Universal Extra Dimension (mUED) model, can be a good candidate forthis signal, as its branching ratio into $\ell\nu$ is sizable. Moreover, nearlydegenerate KK mass spectra in the mUED model yield generically very soft SMparticle accompanying $W^{(2)}$ from the subsequent decays of the second KKquarks and gluons. In a hadron collider, this indirect $W^{(2)}$ production isdifficult to distinguish from the $W^{(2)}$ single production. The involvedstrong interactions make it more important than the single production. Theearly LHC data on $\ell+\met$ signal for 1.1 fb$^{-1}$ integrated luminosity isshown insufficient to limit our model even with significant indirect productionof $W^{(2)}$. However, the results show that the present LHC 5.6 fb$^{-1}$ datacan cover most of the reasonable parameter space of the mUED model.

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