Bibcode
Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Hartl, C.; Hörmann, N.; Hrubec, J.; Jeitler, M.; König, A.; Krammer, M.; Krätschmer, I.; Liko, D.; Matsushita, T.; Mikulec, I.; Rabady, D.; Rad, N.; Rahbaran, B.; Rohringer, H.; Schieck, J.; Schöfbeck, R.; Strauss, J.; Treberer-Treberspurg, W.; Waltenberger, W.; Wulz, C.-E.; Mossolov, V.; Shumeiko, N.; Suarez Gonzalez, J.; Alderweireldt, S.; Cornelis, T.; de Wolf, E. A.; Janssen, X.; Knutsson, A.; Lauwers, J.; Luyckx, S.; van de Klundert, M.; van Haevermaet, H.; van Mechelen, P.; van Remortel, N.; van Spilbeeck, A.; Abu Zeid, S.; Blekman, F.; D'Hondt, J.; Daci, N.; de Bruyn, I.; Deroover, K.; Heracleous, N.; Keaveney, J.; Lowette, S.; Moortgat, S.; Moreels, L.; Olbrechts, A.; Python, Q.; Strom, D.; Tavernier, S.; van Doninck, W.; van Mulders, P.; van Onsem, G. P.; van Parijs, I.; Brun, H.; Caillol, C.; Clerbaux, B.; de Lentdecker, G.; Fasanella, G.; Favart, L.; Goldouzian, R.; Grebenyuk, A.; Karapostoli, G.; Lenzi, T.; Léonard, A.; Maerschalk, T.; Marinov, A.; Perniè, L.; Randle-Conde, A.; Seva, T.; Vander Velde, C.; Vanlaer, P.; Yonamine, R.; Zenoni, F.; Zhang, F.; Benucci, L.; Cimmino, A.; Crucy, S.; Dobur, D.; Fagot, A.; Garcia, G.; Gul, M.; McCartin, J.; Ocampo Rios, A. A.; Poyraz, D.; Ryckbosch, D. et al.
Bibliographical reference
Journal of High Energy Physics, Volume 2016, Issue 4, article id. #169, 43 pp.
Advertised on:
4
2016
Citations
33
Refereed citations
29
Description
A search is performed for heavy Majorana neutrinos (N) decaying into a W
boson and a lepton using the CMS detector at the Large Hadron Collider.
A signature of two jets and either two same sign electrons or a same
sign electron-muon pair is searched for using 19.7 fb-1 of
data collected during 2012 in proton-proton collisions at a
centre-of-mass energy of 8 TeV. The data are found to be consistent with
the expected standard model (SM) background and, in the context of a
Type-1 seesaw mechanism, upper limits are set on the cross section times
branching fraction for production of heavy Majorana neutrinos in the
mass range between 40 and 500 GeV. The results are additionally
interpreted as limits on the mixing between the heavy Majorana neutrinos
and the SM neutrinos. In the mass range considered, the upper limits
range between 0.00015-0.72 for |VeN|2 and 6.6
× 10-5-0.47 for | V eN V μN
∗ |2/(| V eN|2 + | V
μN|2), where VℓN is the mixing
element describing the mixing of the heavy neutrino with the SM neutrino
of flavour ℓ. These limits are the most restrictive direct limits
for heavy Majorana neutrino masses above 200 GeV. [Figure not available:
see fulltext.]