Abstract
A search is presented for the production of two Higgs bosons in final states containing two photons and two bottom quarks. Both resonant and nonresonant hypotheses are investigated. The analyzed data correspond to an integrated luminosity of 19.7 inverse femtobarns of proton-proton collisions at sqrt(s) = 8 TeV collected with the CMS detector. Good agreement is observed between data and predictions of the standard model (SM). Upper limits are set at 95% confidence level on the production cross section of new particles and compared to the prediction for the existence of a warped extra dimension. When the decay to two Higgs bosons is kinematically allowed, assuming a mass scale Lambda[R] = 1 TeV for the model, the data exclude a radion scalar at masses below 980 GeV. The first Kaluza-Klein excitation mode of the graviton in the RS1 Randall-Sundrum model is excluded for masses between 325 and 450 GeV. An upper limit of 0.71 pb is set on the nonresonant two-Higgs-boson cross section in the SM-like hypothesis. Limits are also derived on nonresonant production assuming anomalous Higgs boson couplings.
Highlights
The discovery of a boson with a mass of approximately 125 GeV, with properties close to those expected for the Higgs boson (H) of the standard model (SM) [1,2], has stimulated interest in the exploration of the Higgs potential
In the SM, the cross section for the production of two Higgs bosons in proton-proton collisions at 8 TeV is 10.0 Æ 1.4 fb for the gluon-gluon fusion process [3,4,5], which lies beyond the reach of analyses based on the first run of the CERN LHC
Many theories beyond the SM (BSM) suggest the existence of heavy particles that can couple to a pair of Higgs bosons
Summary
The discovery of a boson with a mass of approximately 125 GeV, with properties close to those expected for the Higgs boson (H) of the standard model (SM) [1,2], has stimulated interest in the exploration of the Higgs potential. The brane where the density of the extra dimensional metric is localized is called “Planck brane,” while the other, where the Higgs field is localized, is called “TeV brane.” This class of models predicts the existence of new particles that can decay to a Higgs-boson pair, such as the spin-0 radion (R). This paper describes a search for the production of pairs of Higgs bosons in the γγbbfinal state in pp collisions at the LHC, using data corresponding to an integrated lumipnoffiffisity of 19.7 fb−1 collected by the CMS experiment at s 1⁄4 8 TeV Both nonresonant and resonant production are explored, with the search for a narrow resonance X conducted at masses mX between 260 and 1100 GeV.
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