Abstract
A search for a heavy scalar boson H decaying into a pair of lighter standard-model-like 125 GeV Higgs bosons h and a search for a heavy pseudoscalar boson A decaying into a Z and an h boson are presented. The searches are performed on a data set corresponding to an integrated luminosity of 19.7 inverse femtobarns of pp collision data at a centre-of-mass energy of 8 TeV, collected by CMS in 2012. A final state consisting of two tau leptons and two b jets is used to search for the H to hh decay. A final state consisting of two tau leptons from the h boson decay, and two additional leptons from the Z boson decay, is used to search for the decay A to Zh. The results are interpreted in the context of the two-Higgs-doublet models. No excess is found above the standard model expectation and upper limits are set on the heavy boson production cross sections in the mass ranges 260 < m[H] < 350 GeV and 220 < m[A] < 350 GeV.
Highlights
The discovery of additional Higgs bosons at the LHC would provide direct evidence of physics beyond the standard model (SM)
Both shape and normalisation are taken from Monte Carlo simulation (MC), and the results are checked against data in a control region where the presence of tt events is enhanced by requiring eμ in the final state instead of a ditau, and at least one b tagged jet
The collinear approximation for the decay products of the τ leptons is assumed in the fit, since the τ leptons are highly boosted as they originate from an object that is heavy when compared to their own mass
Summary
The discovery of additional Higgs bosons at the LHC would provide direct evidence of physics beyond the standard model (SM). A requirement on LhT, which is the scalar sum of the visible transverse momenta of the two τ candidates originating from the h boson, is applied to lower the reducible background from misidentified leptons as well as the irreducible background from ZZ production The thresholds of this requirement depend on the final state and have been chosen in such a way as to optimise the sensitivity of the analysis to the presence of an A → Zh signal for A masses between 220 and 350 GeV. √ The four final objects are further required to be separated from each other by ∆R= (∆η)2 + (∆φ) larger than 0.5 (where phi is in radians), and to come from the same primary vertex In this channel the signal extraction is performed using the distribution of the reconstructed mass of the A boson candidate
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