Search for higgs boson decays to a photon and a z boson in pp collisions at root s=7 and 8 TeV with the ATLAS detector
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KünyeADD, G., ABAJYAN, T., ABBOTT, B., ABDALLAH, J., ABDELKHALEK, S.,ABDINOV, O., ATLAS Collaboration. (2014). Search for higgs boson decays to a photon and a z boson in pp collisions at root s=7 and 8 TeV with the ATLAS detector. Physics Letters B, Volume 732, pp. 8-27. http://dx.doi.org/10.1016/j.physletb.2014.03.015.
A search is reported for a neutral Higgs boson in the decay channel H -> Z gamma, Z -> l(+)l(-) (l = e, mu), using 4.5 fb(-1) of pp collisions at root s = 7 TeV and 20.3 fb(-1) of pp collisions at root s = 8 TeV, recorded by the ATLAS detector at the CERN Large Hadron Collider. The observed distribution of the invariant mass of the three final-state particles, m(ll gamma), is consistent with the Standard Model hypothesis in the investigated mass range of 120-150 GeV. For a Higgs boson with a mass of 125.5 GeV, the observed upper limit at the 95% confidence level is 11 times the Standard Model expectation. Upper limits are set on the cross section times branching ratio of a neutral Higgs boson with mass in the range 120-150 GeV between 0.13 and 0.5 pb for root s = 8 TeV at 95% confidence level. (C) 2014 The Authors. Published by Elsevier B.V.