Search for type-III Seesaw heavy leptons in $pp$ collisions at $\sqrt{s}= 8$ TeV with the ATLAS Detector - INSPIRE

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Search for type-III Seesaw heavy leptons in $pp$ collisions at $\sqrt{s}= 8$ TeV with the ATLAS Detector

ATLAS

Collaboration

Jun 5, 2015

20 pages

Published in:

Phys.Rev.D 92 (2015) 3, 032001

Published: Aug 3, 2015

e-Print:

1506.01839 [hep-ex]

DOI:

10.1103/PhysRevD.92.032001

Report number:

CERN-PH-EP-2015-094

Experiments:

CERN-LHC-ATLAS

View in:

reference search69 citations

Citations per year

Abstract: (APS)

A search for the pair production of heavy leptons (N0,L±) predicted by the type-III seesaw theory formulated to explain the origin of small neutrino masses is presented. The decay channels N0→W±l∓ (ℓ=e,μ,τ) and L±→W±ν (ν=νe,νμ,ντ) are considered. The analysis is performed using the final state that contains two leptons (electrons or muons), two jets from a hadronically decaying W boson and large missing transverse momentum. The data used in the measurement correspond to an integrated luminosity of 20.3 fb-1 of pp collisions at s=8 TeV collected by the ATLAS detector at the LHC. No evidence of heavy lepton pair production is observed. Heavy leptons with masses below 325–540 GeV are excluded at the 95% confidence level, depending on the theoretical scenario considered.

Note:

11 pages plus author list + cover pages (22 pages total), 4 figures, 1 table, submitted to PRD, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2014-07/

14.60.Hi
13.35.Hb
p p: scattering
p p: colliding beams
heavy lepton: pair production
heavy lepton: decay modes
W: hadronic decay
neutrino: mass generation
ATLAS
transverse momentum: missing-energy

References(55)

Figures(7)

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