Abstract
Results are presented from a search for production of Higgs boson pairs (HH) where one boson decays to a pair of b quarks and the other to a tau lepton pair. This work is based on proton-proton collision data collected by the CMS experiment at sqrt(s) = 8 TeV, corresponding to an integrated luminosity of 18.3 inverse femtobarns. Resonant and nonresonant modes of HH production have been probed and no significant excess relative to the background-only hypotheses has been found in either mode. Upper limits on cross sections of the two HH production modes have been set. The results have been combined with previously published searches at sqrt(s) = 8 TeV, in decay modes to two photons and two b quarks, as well as to four b quarks, which also show no evidence for a signal. Limits from the combination have been set on resonant HH production by an unknown particle X in the mass range m[X] = 300 GeV to m[X] = 1000 GeV. For resonant production of spin 0 (spin 2) particles, the observed 95% CL upper limit is 1.13 pb (1.09 pb) at m[X] = 300 GeV and to 21 fb (18 fb) at m[X] = 1000 GeV. For nonresonant HH production, a limit of 43 times the rate predicted by the standard model has been set.
Highlights
The discovery of a standard model (SM)-like Higgs (H) boson [1,2] motivates further investigation of the nature of electroweak symmetry breaking
The probabilities for the leading τh candidate to pass the relaxed and nominal τh identification criteria are measured in events that contain two τh candidates of the same charge, as functions of pT of the leading τh candidate in three regions of η, jηj < 1.2, 1.2 < jηj < 1.7, and 1.7 < jηj < 2.1
A search has been performed for events containing a pair of SM-like H’s in resonant and nonresonant production of the pair in the channel where one boson decays to a pair of b quarks and the other to a τ lepton pair, in pp collisions collected by the CMS experiment at 8 TeV center-of-mass energy, corresponding to an integrated luminosity of 18.3 fb−1
Summary
The discovery of a standard model (SM)-like Higgs (H) boson [1,2] motivates further investigation of the nature of electroweak symmetry breaking. [4,5] predict such an enhancement in which the mass distribution of the H pair is expected to be broad We refer to this case as nonresonant HH production. The ATLAS Collaboration has searched for resonant as well as nonresonant HH production in the bbττ, γγWWÃ, γγbb, and bbbb decay channels [28,29,30]. Their observed (expected) limit on nonresonant HH production, obtained by combining all channels, corresponds to 70 (48) times the SM production rate.
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