A search is performed for heavy Majorana neutrinos (N) using an event signature defined by two muons of the same charge and two jets (μ±μ±jj). The data correspond to an integrated luminosity of 19.7fb−1of proton–proton collisions at a center-of-mass energy of 8TeV, collected with the CMS detector at the CERN LHC. No excess of events is observed beyond the expected standard model background and upper limits are set on |VμN|2as a function of Majorana neutrino mass mNfor masses in the range of 40–500GeV, where VμNis the mixing element of the heavy neutrino with the standard model muon neutrino. The limits obtained are |VμN|2<0.00470for mN=90GeV, |VμN|2<0.0123for mN=200GeV, and |VμN|2<0.583for mN=500GeV. These results extend considerably the regions excluded by previous direct searches.
Search for heavy Majorana neutrinos in μ±μ± + jets events in proton-proton collisions at s=8 TeV
Sola, V.;AMAPANE, Nicola Carlo;ARGIRO', Stefano;BELLAN, Riccardo;COSTA, Marco;COVARELLI, Roberto;MIGLIORE, Ernesto;MONACO, Vincenzo;OBERTINO, Maria Margherita;ROMERO, Alessandra;SACCHI, Roberto;SOLANO, Ada Maria;
2015-01-01
Abstract
A search is performed for heavy Majorana neutrinos (N) using an event signature defined by two muons of the same charge and two jets (μ±μ±jj). The data correspond to an integrated luminosity of 19.7fb−1of proton–proton collisions at a center-of-mass energy of 8TeV, collected with the CMS detector at the CERN LHC. No excess of events is observed beyond the expected standard model background and upper limits are set on |VμN|2as a function of Majorana neutrino mass mNfor masses in the range of 40–500GeV, where VμNis the mixing element of the heavy neutrino with the standard model muon neutrino. The limits obtained are |VμN|2<0.00470for mN=90GeV, |VμN|2<0.0123for mN=200GeV, and |VμN|2<0.583for mN=500GeV. These results extend considerably the regions excluded by previous direct searches.File | Dimensione | Formato | |
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