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We study the $a_1a_1$ and $Za_1$ decay channels of the next-to-lightestCP-even Higgs boson $h_2$ of the NMSSM at the LHC, where the $h_2$ is producedin gluon fusion. It is found that while the $h_2$ discovery is impossiblethrough the latter channel, the former one in the $ 4\tau$ final state is apromising channel to discover the $h_2$ with masses up to around 250 GeV at theLHC. Such a discovery of the $h_2$ is mostly accompanied with a light $a_1$,which is a clear evidence for distinguishing the NMSSM from the MSSM since sucha light $a_1$ is impossible in the MSSM.

LHC signals of the next-to-lightest scalar Higgs state of the NMSSM in the $ 4\tau$ decay channel