Direct bounds on electroweak scale pseudo-Dirac neutrinos from s=8 TeV LHC data
By Arindam Das, P. S. Bhupal Dev, N. Okada. 2014
148 citations recorded by the source corpus.
Seesaw models with a small lepton number breaking can naturally accommodate electroweak-scale pseudo-Dirac neutrinos with a sizable mixing with the active neutrinos, while satisfying the light neutrino oscillation data. Due to the smallness of the lepton number breaking parameter, the ‘smoking gun’ collider signature of same-sign dileptons is suppressed, and the heavy neutrinos in these models would manifest at the LHC dominantly through lepton number conserving trilepton nal states. Using the recent CMS results for anomalous production of multilepton events at p s=8 TeV LHC with an integrated luminosity of 19:5 fb 1 , we derive direct upper bounds on the light-heavy neutrino mixing parameter as a function of the heavy Dirac neutrino mass. These limits extend the collider sensitivity to higher heavy neutrino masses up to about 500 GeV. In the lower mass range, our limits are comparable to the existing indirect constraints derived from Higgs and electroweak precision data.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/e071a98c2d8e144fe43dc303f5c23b0c79ee8a11
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In Nuclear and High Energy Physics
Citations in the corpus
- Lepton Number Violation: Seesaw Models and Their Collider Tests (2017, background): “38) has also appeared in the recent literature [255, 262, 274].”
- Heavy Majorana neutrinos from Wγ fusion at hadron colliders (2014, background): “More recently [60], the tree-level rate for Nlj with pjT > 30 GeV was calculated to be 80% of the LO DY rate at mN = 500 GeV; at NNLO, we find the inclusive correction to be only 20%.”