Please use this identifier to cite or link to this item: http://buratest.brunel.ac.uk/handle/2438/13701
Title: Search for heavy Majorana neutrinos in e<sup>±</sup>e<sup>±</sup>+ jets and e<sup>±</sup>µ<sup>±</sup>+ jets events in proton-proton collisions at √s = 8 TeV
Authors: Khachatryan, V
Sirunyan, AM
Tumasyan, A
Adam, W
Asilar, E
Bergauer, T
Brandstetter, J
Brondolin, E
Dragicevic, M
Erö, J
Flechl, M
Friedl, M
Frühwirth, R
Ghete, VM
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, CE
Mossolov, V
Shumeiko, N
Suarez Gonzalez, J
Alderweireldt, S
Cornelis, T
De Wolf, EA
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, GP
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
Keywords: Beyond standard model;Hadron-Hadron scattering (experiments)
Issue Date: 2016
Publisher: Springer Verlag
Citation: Journal of High Energy Physics, 2016(169): pp. 1-43, (2016)
Abstract: 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 8TeV. 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 |VeNV * µN|2/(|VeN|2+|VµN|2), where V ℓN 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.
URI: http://bura.brunel.ac.uk/handle/2438/13701
DOI: http://dx.doi.org/10.1007/JHEP04(2016)169
ISSN: 1029-8479
Appears in Collections:Dept of Electronic and Computer Engineering Research Papers

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