Search for heavy Majorana neutrinos with the ATLAS detector in pp collisions at √s 8 TeV

Allison, Lee and Barton, Adam and Beattie, Michael and Borissov, Guennadi and Bouhova-Thacker, Eva and Chilingarov, Alexandre and Dearnaley, William and Fox, Harald and Grimm, Kathryn and Henderson, Robert and Hughes, Gareth and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin and Love, Peter and Maddocks, Harvey and Skinner, Malcolm and Smizanska, Maria and Walder, James and Wharton, Andy (2015) Search for heavy Majorana neutrinos with the ATLAS detector in pp collisions at √s 8 TeV. Journal of High Energy Physics, 2015 (7). ISSN 1029-8479

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Abstract

A search for heavy Majorana neutrinos in events containing a pair of high-p T leptons of the same charge and high-p T jets is presented. The search uses 20.3 fb−1 of pp collision data collected with the ATLAS detector at the CERN Large Hadron Collider with a centre-of-mass energy of s √ =8 TeV. The data are found to be consistent with the background-only hypothesis based on the Standard Model expectation. In the context of a Type-I seesaw mechanism, limits are set on the production cross-section times branching ratio for production of heavy Majorana neutrinos in the mass range between 100 and 500 GeV. The limits are subsequently interpreted as limits on the mixing between the heavy Majorana neutrinos and the Standard Model neutrinos. In the context of a left-right symmetric model, limits on the production cross-section times branching ratio are set with respect to the masses of heavy Majorana neutrinos and heavy gauge bosons W R and Z′.

Item Type:
Journal Article
Journal or Publication Title:
Journal of High Energy Physics
Additional Information:
Open Access, Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP3. - Evidence of Acceptance on Publisher PDF
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
75603
Deposited By:
Deposited On:
14 Sep 2015 08:41
Refereed?:
Yes
Published?:
Published
Last Modified:
08 Aug 2020 04:30