Abstract
A search for heavy right-handed Majorana or Dirac neutrinos NR and heavy right-handed gauge bosons WR is performed in events with a pair of energetic electrons or muons, with the same or opposite electric charge, and two energetic jets. The events are selected from pp collision data with an integrated luminosity of 36.1 fb−1 collected by the ATLAS detector at sqrt{s}=13 TeV. No significant deviations from the Standard Model are observed. The results are interpreted within the theoretical framework of a left-right symmetric model and lower limits are set on masses in the heavy right-handed W boson and neutrino mass plane. The excluded region extends to {m}_{R_R}=4.7 TeV for both Majorana and Dirac NR neutrinos.
Highlights
Background estimationThe composition of the SM background is substantially different in the OS and SS channels, requiring different background estimation techniques in the two cases, SM back- Region Control regionValidation region Signal region ChannelControl regions (CR)( ± ∓) CR( ± ∓) CR( ± ±) validation regions (VR)( ± ∓) VR( ± ±) Signal regions (SR)( ± ∓) SR( ± ±)mee [GeV] [60, 110]— [110, 300] [110, 400] [300, 400] > 400 > 400 mμμ [GeV] [60, 110][60, 300] [110, 400] [300, 400] > 400 > 400 meμ [GeV] > 400
The results are interpreted within the theoretical framework of a left-right symmetric model and lower limits are set on masses in the heavy right-handed W boson and neutrino mass plane
Signal events with matrix elements calculated by MG5 aMC@NLO v2.2.2 [24, 25] were simulated by Pythia8.186 [26] using the NNPDF2.3 [31] parton distribution function (PDF) set and the A14 set of tuned parton shower parameters [32]
Summary
The ATLAS experiment [27] is a multipurpose particle detector with a forward-backward symmetric cylindrical geometry and a near 4π coverage in solid angle. It consists of an inner tracking detector (ID) surrounded by a thin superconducting solenoid providing a 2 T axial magnetic field, electromagnetic (EM) and hadron calorimeters, and a muon spectrometer (MS). The ATLAS experiment [27] is a multipurpose particle detector with a forward-backward symmetric cylindrical geometry and a near 4π coverage in solid angle.. The ATLAS experiment [27] is a multipurpose particle detector with a forward-backward symmetric cylindrical geometry and a near 4π coverage in solid angle.2 It consists of an inner tracking detector (ID) surrounded by a thin superconducting solenoid providing a 2 T axial magnetic field, electromagnetic (EM) and hadron calorimeters, and a muon spectrometer (MS). The first-level trigger is implemented in hardware and uses a subset of the detector information. This is followed by the software-based high-level trigger, reducing the event rate to about 1 kHz
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