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Lepton flavor violating dilepton dijet signatures from sterile neutrinos at proton colliders

Antusch, Stefan; Cazzato, Eros; Fischer, Oliver; Hammad, A.; Wang, Kechen

In this article we investigate the prospects of searching for sterile neutrinos in lowscale seesaw scenarios via the lepton flavour violating (but lepton number conserving) dilepton dijet signature. In our study, we focus on the final state e±μ∓jj at the HL-LHC and the FCC-hh (or the SppC). We perform a multivariate analysis at the detector level including the dominant SM backgrounds from di-top, di-boson, and tri-boson. Under the assumption of the active-sterile neutrino mixings |VlN|2 = |θe|2 = |θμ|2 and |VτN|2 = |θτ|2 = 0, the sensitivities on the signal production cross section times branching ratio σ(pp → l±N) × BR(N → l∓jj) and on |VlN|2 for sterile neutrino mass MN between 200 and 1000 GeV are derived. For the benchmark MN = 500 GeV, when ignoring systematic uncertainties at the HL-LHC (FCC-hh/SppC) with 3 (20) ab−1 luminosity, the resulting 2-σ limits on |VlN|2 are 4.9 × 10−3 (7.0 × 10−5), while the 2-σ limit on σ × BR are 4.4 × 10−2 (1.6 × 10−2) fb, respectively. The effect of the systematic uncertainty is also studied and found to be important for sterile neutrinos with smaller masses. We also comment on searches with τ±μ∓jj and τ±e∓jj final states.

Verlagsausgabe §
DOI: 10.5445/IR/1000086808
Veröffentlicht am 22.10.2018
DOI: 10.1007/JHEP10(2018)067
Zitationen: 11
Zitationen: 9
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Kernphysik (IKP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 10.2018
Sprache Englisch
Identifikator ISSN: 1029-8479
KITopen-ID: 1000086808
HGF-Programm 51.03.06 (POF III, LK 01) Theoretische Astroteilchenphysik
Erschienen in Journal of high energy physics
Verlag Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Band 2018
Heft 10
Seiten Article: 67
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Vorab online veröffentlicht am 09.10.2018
Schlagwörter Phenomenological Models
Nachgewiesen in Dimensions
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