Direct Bounds on Electroweak Scale Pseudo-Dirac Neutrinos from √s = 8TeV LHC Data

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dc.contributor.author Okada, Nobuchika
dc.date.accessioned 2019-05-30T17:49:59Z
dc.date.available 2019-05-30T17:49:59Z
dc.date.issued 2014-07-30
dc.identifier.citation Das, A., Dev, P.S., Okada, N. (2014): Direct Bounds on Electroweak Scale Pseudo-Dirac Neutrinos from √s=8TeV LHC Data. Physics Letters B, 735 (364-370). en_US
dc.identifier.uri http://ir.ua.edu/handle/123456789/5648
dc.description.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=8TeV LHC with an integrated luminosity of 19.5fb⁻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. en_US
dc.format.mimetype application/pdf en_US
dc.language English en_US
dc.title Direct Bounds on Electroweak Scale Pseudo-Dirac Neutrinos from √s = 8TeV LHC Data en_US
dc.type text en_US


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