There are actually way to make it hidden in the sense that it is in principle reachable at the LHC in terms of its mass, but the way it couples to the other particles make it not so easily detectable. For instance, if the boson is leptophobic, it does not couple to electrons and the golden channel to find it... is just useless.
There are actually way to make it hidden in the sense that it is in principle reachable at the LHC in terms of its mass, but the way it couples to the other particles make it not so easily detectable. For instance, if the boson is leptophobic, it does not couple to electrons and the golden channel to find it... is just useless.