ATLAS Collaboration

Dark matter evidence, particle physics candidates and detection methods

“…(Although the Higgs sector may be more complicated, and invisible decays may be present, for example.) It is interesting to note, although still to early to judge the significance of, the early indications of a Higgs signal at a mass around 125 GeV [42,43]. This is indeed within the possibility of the MSSM, although such a large radiative correction to the mass again puts some strain on the naturalness of parameters.…”

“…After a couple of years, the energy will be in the full 14 TeV range that was designed (but which could not be obtained at start-up, due to a technical mishap). There is great hope that the main experiments at the LHC, ATLAS [17] and CMS [18], may discover events that do not fit into the current Standard Model of particle physics. It may on one hand be very difficult to prove that one has, for instance, found the dark matter particles, as the required lifetime has to be demonstrated to be much longer than the age of the universe.…”

Identifying a light charged Higgs boson at the LHC Run II

“…Assuming a light charged Higgs boson, i.e., such that M H ± < m t − m b , the ATLAS and CMS experiments have already drawn an exclusion on BR(t → H + b) × BR(H ± → τ ν) based on the search for the corresponding decay chain [12,13]. Other channels, such as H + → cs, have also been searched for by ATLAS and CMS [14,15].…”

Large Hadron Collider and Dark Matter

“…The Higgs boson has been the missing block to complete the Standard Model of particle physics for more than 40 years. Finally it seems that the search is over: The ATLAS and CMS collaborations presented on the 4th July 2012 the first evidence of a Higgslike boson, with a mass around 125 GeV (Aad et al 2012;Chatrchyan et al 2012b). After that first observation, further data on its production mechanisms and decay channels seem to confirm that it is the Standard Model Higgs, but more evidence (e.g.…”

“…1 In those scenarios, though, the monojet or monophoton channels can again become useful. For example monojet/monophoton bounds on the case of graviton production in extra-dimensional scenarios and for Dark Matter production at colliders given in (Aad et al 2013c;Chatrchyan et al 2012c) have recently been reinterpreted for the case of a degenerate gaugino spectrum, excluding gluino masses up to 450-500 GeV (Dreiner & Tattersall 2012).…”