Daniel H. Biedermann

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A search for the decays of the Higgs and Z bosons to a ϕ meson and a photon is performed with a pp collision data sample corresponding to an integrated luminosity of 2.7  fb^{-1} collected at sqrt[s]=13  TeV with the ATLAS detector at the LHC. No significant excess of events is observed above the background, and 95% confidence level upper limits on the(More)
Search for direct top squark pair production in final states with two tau leptons in pp collisions at √ s = 8 TeV with the ATLAS detector Abstract A search for direct pair production of the super-symmetric partner of the top quark, decaying via a scalar tau to a nearly massless gravitino, has been performed using 20 fb −1 of proton–proton collision data at(More)
This paper reviews and extends searches for the direct pair production of the scalar supersymmetric partners of the top and bottom quarks in proton-proton collisions collected by the ATLAS collaboration during the LHC Run 1. Most of the analyses use 20 [Formula: see text] of collisions at a centre-of-mass energy of [Formula: see text] TeV, although in some(More)
Searches for pair-produced scalar leptoquarks are performed using 20 fb −1 of proton–proton collision data provided by the LHC and recorded by the ATLAS detector at √ s = 8 TeV. Events with two electrons (muons) and two or more jets in the final state are used to search for first (second)-generation leptoquarks. The results from two previously published(More)
This paper reports a detailed study of techniques for identifying boosted, hadronically decaying W bosons using 20.3 fb −1 of proton–proton collision data collected by the ATLAS detector at the LHC at a centre-of-mass energy √ s = 8 TeV. A range of techniques for optimising the signal jet mass resolution are combined with various jet sub-structure(More)
Measurements of fiducial cross-sections for t ¯ t production with one or two additional b-jets in pp collisions at √ s = 8 TeV using the ATLAS detector Abstract Fiducial cross-sections for t ¯ t production with one or two additional b-jets are reported, using an integrated luminosity of 20.3 fb −1 of proton–proton collisions at a centre-of-mass energy of 8(More)
Search for metastable heavy charged particles with large ionisation energy loss in pp collisions at √ s = 8 TeV using the ATLAS experiment Abstract Many extensions of the Standard Model predict the existence of charged heavy long-lived particles, such as R-hadrons or charginos. These particles, if produced at the Large Hadron Collider, should be moving(More)