Search for heavy Majorana neutrinos in e±e± and e±μ± final states via WW scattering in pp collisions at s=13 TeV with the ATLAS detector
Küçük Resim Yok
Tarih
2024
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
A search for heavy Majorana neutrinos in scattering of same-sign W boson pairs in proton–proton collisions at s=13 TeV at the LHC is reported. The dataset used corresponds to an integrated luminosity of 140 fb−1, collected with the ATLAS detector during 2015–2018. The search is performed in final states including a same-sign ee or eμ pair and at least two jets with large invariant mass and a large rapidity difference. No significant excess of events with respect to the Standard Model background predictions is observed. The results are interpreted in a benchmark scenario of the Phenomenological Type-I Seesaw model. New constraints are set on the values of the |VeN|2 and |VeNVμN⁎| parameters for heavy Majorana neutrino masses between 50 GeV and 20 TeV, where VℓN is the matrix element describing the mixing of the heavy Majorana neutrino mass eigenstate with the Standard Model neutrino of flavour ℓ=e,μ. The sensitivity to the Weinberg operator is investigated and constraints on the effective ee and eμ Majorana neutrino masses are reported. The statistical combination of the ee and eμ channels with the previously published μμ channel is performed.
Açıklama
Anahtar Kelimeler
Kaynak
Physics letters, section b: nuclear, elementary particle and high-energy physics
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
856
Sayı
Künye
Aad, G., Kupco, A., Chan, J., Ma, K., Principe Martin, M. A., Delsart, P. A., ... & Masik, J. (2024). Search for heavy Majorana neutrinos in $ e^{\pm} e^{\pm} $ and $ e^{\pm}\mu^{\pm} $ final states via WW scattering in $ pp $ collisions at $\sqrt {s}= 13$ TeV with the ATLAS detector (No. CERN-EP-2024-083). ATLAS-EXOT-2023-16-003.
