Seeking for sterile neutrinos with displaced leptons at the LHC

Liu, Jia; Liu, Zhen; Wang, Lian-Tao; Wang, Xiao-Ping

doi:10.1007/JHEP07(2019)159

Title: Seeking for sterile neutrinos with displaced leptons at the LHC

Journal Article · 26 July 2019 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/JHEP07(2019)159 · OSTI ID:1593919

Liu, Jia ^[1]; Liu, Zhen ^[2]; Wang, Lian-Tao ^[3]; Wang, Xiao-Ping ^[4]

Univ. of Chicago, IL (United States). Enrico Fermi Inst.; University of Chicago
Univ. of Maryland, College Park, MD (United States)
Univ. of Chicago, IL (United States). Enrico Fermi Inst., and Kavli Inst. for Cosmological Physics
Argonne National Lab. (ANL), Argonne, IL (United States)

We study the signal of long-lived sterile neutrino at the LHC produced through the decay of the W boson. It decays into charged lepton and jets. The characteristic signature is a hard prompt lepton and a lepton from the displaced decay of the sterile neutrino, which leads to a bundle of displaced tracks with large transverse impact parameter. Different from other studies, we neither reconstruct the displaced vertex nor place requirement on its invariant mass to maintain sensitivity for low sterile neutrino masses. Instead, we focus on the displaced track from the lepton. A difficulty for low mass sterile neutrino study is that the displaced lepton is usually non-isolated.Therefore, leptons from heavy flavor quark is the major source of background. We closely follow a search for displaced electron plus muon search at CMS and study their control regions, which is related to our signal regions, in great detail to develop a robust estimation of the background for our signals. After further optimization on the signal limiting the number of jets, low H_T and large lepton displacement d₀ to suppress SM background, we reach an exclusion sensitivity of about 10^-8 (10^-5) for the mixing angle square at 10 (2) GeV sterile neutrino mass respectively. Thestrategy we propose can cover the light sterile masses complimentary to beam dumpand forward detector experiments

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Research Organization:: Univ. of Chicago, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Grant/Contract Number:: SC0009924

OSTI ID:: 1593919

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 7 Vol. 2019; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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