{'fraction_non_alphanumeric': 0.033404406538734895, 'fraction_numerical': 0.024164889836531627, 'mean_word_length': 3.923076923076923, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
t resonance searches in the lepton plus jets topology using 200 pb 1 of pp collisions at p s =7 TeV in ATLAS

The top quark is the heaviest elementary particle known. Some Beyond Standard Model theories predict the existence of new heavy particles decaying into top pairs. In the lepton plus jets topology the search of these resonances is done using the t ¯ t mass spectra, which is built by three or four jets, an electron or muon and a neutrino. The benchmark model used to quantify the experimental sensitivity to narrow resonances is a leptophobic Z ′ boson arising in models of strong electroweak symmetry breaking through top quark condensation [1]. The model used for wide resonances is a Kaluza-Klein gluon g KK , which appears in Randall-Sundrum (RS) models with a warped extra dimension [2]. A search for t ¯ t resonances in the lepton ( e / µ ) plus jets topology has been performed using 200 pb − 1 of pp collisions at √ s = 7 TeV recorded by ATLAS in 2011. No evidence of a resonance was found. Limits were set on the production cross-section times branching ratio, using the t ¯ t mass spectra, for narrow and wide resonances. For a narrow leptophobic Z ′ in the TopColor model the observed 95% C.L. limits range from 38 pb to 3.2 pb for masses going from m Z ′ = 500 GeV to m Z ′ = 1300 GeV. While the wide Kaluza-Klein gluon in the RS models with mass below 650 GeV was excluded at 95% C.L.