Search for heavy Majorana neutrinos in same-sign dilepton channels in proton-proton collisions at sqrt(s) = 13 TeVстатья

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Дата последнего поиска статьи во внешних источниках: 19 марта 2019 г.

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[1] Search for heavy majorana neutrinos in same-sign dilepton channels in proton-proton collisions at sqrt(s) = 13 tev / A. Baskakov, A. V. Belyaev, E. Boos et al. // Journal of High Energy Physics. — 2019. — Vol. 2019, no. 1. — P. 122. A search is performed for a heavy Majorana neutrino (N), produced by leptonic decay of a W boson propagator and decaying into a W boson and a lepton, with the CMS detector at the LHC. The signature used in this search consists of two same-sign leptons, in any flavor combination of electrons and muons, and at least one jet. The data were collected during 2016 in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1. The results are found to be consistent with the expected standard model backgrounds. Upper limits are set in the mass range between 20 and 1600 GeV in the context of a Type-I seesaw mechanism, on |VeN|2, |VμN|2, and |VeNV∗μN|2 / (|VeN|2 + |VμN|2), where VℓN is the matrix element describing the mixing of N with the standard model neutrino of flavor ℓ= e, μ. For N masses between 20 and 1600 GeV, the upper limits on |VℓN|2 range between 2.3 × 10−5 and unity. These are the most restrictive direct limits for heavy Majorana neutrino masses above 430 GeV. [ DOI ]

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