Direct bounds on electroweak scale pseudo-Dirac neutrinos from s=8 TeV LHC data

2014/05/31 by Arindam Das, P. S. Bhupal Dev, Nobuchika Okada · 2 citations
Physics and Astronomy · #Collider #Dirac (video compression format) #Electroweak interaction #Electroweak scale #Gauge (firearms) #Higgs boson #Large Hadron Collider #Lepton #Lepton number #Neutrino #Neutrino Physics Research #Neutrino oscillation #Nuclear physics #Particle Detector Development and Performance #Particle physics #Particle physics theoretical and experimental studies #Physics #Standard Model (mathematical formulation) #Sterile neutrino #hep-ex #hep-ph

paper · pdf · doi:10.1016/j.physletb.2014.06.058

published as Phys. Lett. B 735, 364 (2014) · 12 pages, 4 figures; clarifications added and Figure 4 updated; version to appear in Phys. Lett. B

arxiv created 2014/06/23 · openalex publication_date 2014/06/27 · arxiv updated 2014/07/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

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 final states. Using the recent CMS results for anomalous production of multilepton events at the 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.

Citations

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Cited by

• Planck-scale induced left–right gauge theory at LHC and experimental tests
• The seesaw portal in testable models of neutrino masses