#19.5fb

The experimental observation of charged Higgs bosons, , which are predicted by many models with an extended Higgs sector, would indicate physics beyond the Standard Model. This note presents the results of a search for charged Higgs bosons in 19.5 fb of proton-proton collision data recorded at  TeV with the ATLAS experiment, using the  + jets channel with a hadronically decaying  lepton in the final state. For light charged Higgs bosons ( ), the  production mode is dominant, while for heavy charged Higgs bosons, associated production of  is dominant. No evidence for a charged Higgs boson is found. For the mass range 90 GeV  GeV, 95 confidence level upper limits on  are set in the range , and for the mass range 180 GeV  GeV, 95 confidence level upper limits are set on the production cross section of a charged Higgs boson in the range  pb, both with the assumption that .

This note presents a search for high-mass ditau resonances decaying in the fully hadronic final state using proton-proton collisions at  TeV produced by the Large Hadron Collider. The data were recorded with the ATLAS detector and correspond to an integrated luminosity of 19.5 fb. No statistically significant excess above the Standard Model expectation is observed; 95% credibility upper limits are set on the cross section times branching fraction of  resonances decaying into  pairs as a function of the resonance mass. As a result,  bosons of the Sequential Standard Model with masses less than 1.90 TeV are excluded at 95% credibility.