Discriminating between lepton number violating scalars using events with four and three charged leptons at the LHC

Many Standard Model extensions predict doubly-charged scalars in particular, all models with resonances in charged lepton-pair channels with non-vanishing lepton number if these are pair produced at the LHC, the observation of their decay into l^+/-l^+/-W^@?W^@? will be necessary in order to establish their lepton-number violating character, which is generally not straightforward. Nonetheless, the analysis of events containing four charged leptons (including scalar decays into one or two taus as well as into W bosons) makes it possible to determine whether the doubly-charged excitation belongs to a multiplet with weak isospin T=0,1/2,1,3/2 or 2 (assuming there are no excitations with charge >2) though discriminating between the isosinglet and isodoublet cases is possible only if charged-current events cannot produce the doubly-charged isosinglet.

Note:

16 pages, 3 figures. V3: matches published version

new physics
lepton number: violation
CERN LHC Coll
p p: scattering
lepton: pair production
lepton: final state
dilepton: production
dilepton: same sign
W: pair production
scalar particle: new particle

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