Publications by Cigdem Issever


Search for heavy particles decaying into top-quark pairs using lepton-plus-jets events in proton-proton collisions at s=13  TeV with the ATLAS detector

European Physical Journal C: Particles and Fields Springer Verlag 78 (2018)

G Artoni, M Backes, A Barr, L Beresford, D Bortoletto, JTP Burr, J Frost, F Giuli, C Gwenlan, C Hays, T Huffman, C Issever, J Liu, L Marchese, R Nickerson, N Norjoharuddeen, M Petrov, MA Pickering, A Sharma, G Viehhauser, L Vigani, A Weidberg, G Zemaityte, M Zgubič

A search for new heavy particles that decay into top-quark pairs is performed using data collected from proton-proton collisions at a centre-of-mass energy of 13  TeV by the ATLAS detector at the Large Hadron Collider. The integrated luminosity of the data sample is 36.1 fb -1 . Events consistent with top-quark pair production are selected by requiring a single isolated charged lepton, missing transverse momentum and jet activity compatible with a hadronic top-quark decay. Jets identified as likely to contain b-hadrons are required to reduce the background from other Standard Model processes. The invariant mass spectrum of the candidate top-quark pairs is examined for local excesses above the background expectation. No significant deviations from the Standard Model predictions are found. Exclusion limits are set on the production cross-section times branching ratio for hypothetical Z' bosons, Kaluza-Kein gluons and Kaluza-Klein gravitons that decay into top-quark pairs.


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