Journal
PHYSICAL REVIEW D
Volume 94, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.94.013005
Keywords
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Funding
- Innovation Program of the Institute of High Energy Physics [Y4515570U1]
- International Postdoctoral Exchange Fellowship Program [90 Document of OCPC]
- NRF - Korean government of the MEST [20110017430, 2011-0020333]
- Chilean Grant Fondecyt [1130617]
- Chilean Grant Conicyt [FB0821, ACT1406]
- National Research Foundation of Korea [2011-0017430, 2011-0020333] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We study the purely leptonic decays of W-+/- -> e(+/-)e(+/-)mu(-/+)nu and mu +/-mu +/- e -/+nu produced at the LHC, induced by sterile neutrinos with mass m(N) below M-W in the intermediate state. Since the final state neutrino escapes detection, one cannot tell whether this process violates lepton number, which would indicate a Majorana character for the intermediate sterile neutrino. Our study shows that when the sterile neutrino mixings with electrons and muons are different enough, one can still discriminate between the Dirac and Majorana character of this intermediate neutrino by simply counting and comparing the above decay rates. After performing collider simulations and statistical analysis, we find that at the 14 TeV LHC with an integrated luminosity of 3000 fb(-1), for two benchmark scenarios m(N) = 20 and 50 GeV, at least a 3 sigma level of exclusion on the Dirac case can be achieved for disparities as mild as, e.g., vertical bar U-Ne vertical bar(2) < 0.7 vertical bar U-N mu vertical bar(2) or vertical bar U-N mu vertical bar(2) < 0.7 vertical bar U-Ne vertical bar(2), provided that vertical bar U-Ne vertical bar(2) and vertical bar U-N mu vertical bar(2) are both above similar to 2 x 10(-6).
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