Probing the seesaw mechanism at the 250 GeV ILC

Das, Arindam; Okada, Nobuchika; Okada, Satomi; Raut, Digesh

doi:10.1016/j.physletb.2019.134849

Cited by 38 publications

(16 citation statements)

References 51 publications

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“…The model variant we will be using in our numerical estimate and its implications for accelerator searches has been discussed recently in Refs. [27,28,[35][36][37]. Apart from the HNLs, the model predicts a Z 0 and (at least) a second Higgs.…”

Section: Hnls In Uð1þ B − Lmentioning

confidence: 87%

Heavy neutral leptons at ANUBIS

Hirsch

Wang

2020

Phys. Rev. D

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Recently Bauer et al. [arXiv:1909.13022] proposed ANUBIS, an auxiliary detector to be installed in one of the shafts above the ATLAS or CMS interaction point, as a tool to search for long-lived particles. Here, we study the sensitivity of this proposal for long-lived heavy neutral leptons (HNLs) in both minimal and extended scenarios. We start with the minimal HNL model where both production and decay of the HNLs are mediated by active-sterile neutrino mixing, before studying the case of right-handed neutrinos in a leftright symmetric model. We then consider a Uð1Þ B−L extension of the Standard Model (SM). In this model HNLs are produced from the decays of the mostly SM-like Higgs boson, via mixing in the scalar sector of the theory. In all cases, we find that ANUBIS has sensitivity reach comparable to the proposed MATHUSLA detector. For the minimal HNL scenario, the contributions from W's decaying to HNLs are more important at ANUBIS than at MATHUSLA, extending the sensitivity to slightly larger HNL masses at ANUBIS.

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Section: Hnls In Uð1þ B − Lmentioning

confidence: 87%

Heavy neutral leptons at ANUBIS

Hirsch

Wang

2020

Phys. Rev. D

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“…Other aspects of heavy neutrinos were for example discussed in Refs. [58][59][60][61], including displaced vertex signatures. Finally, dark matter can be incorporated in B − L models as well as has been for example discussed recently in Ref.…”

Section: Discussionmentioning

confidence: 99%

Searching for a light Z′ through Higgs production at the LHC

2019

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We investigate the potential of LHC resonance searches in leptonic final states to probe the Z in the minimal U (1) B−L model. Considering the current constraints on the Z in terms of its mass m Z and the associated gauge coupling g B−L as well as constraints in the Higgs sector, we analyse the potential of dilepton and four lepton final states for Z production. This includes Drell-Yan production, Higgs mediated decays and final state radiation processes concentrating only on the ATLAS and CMS detectors at the LHC. We show that the four-lepton final state is sensitive to m Z as low as 0.25 GeV. Furthermore, setting the Higgs mixing to sin α = 0.3, this final state has a strong sensitivity and it probes regions of parameter space where the Z is long-lived. We demonstrate the sensitivity at the High Luminosity LHC and comment on the potential of probing displaced vertices due to long-lived Z . Finally, we also comment on the strength of Z and Higgs mediated heavy neutrino processes by taking into account the constraints derived.

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“…with the details of partial decay widths following [43,69], see also [70,71]. The reference mixing angle squared 10 −12 is chosen for SM neutrino mass to 0.01 eV in the basic seesaw model.…”

Section: Sterile Neutrino Propertiesmentioning

confidence: 99%

Seeking for sterile neutrinos with displaced leptons at the LHC

Liu

Wang

et al. 2019

J. High Energ. Phys.

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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 d 0 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. The strategy we propose can cover the light sterile masses complimentary to beam dump and forward detector experiments.

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Probing the seesaw mechanism at the 250 GeV ILC

Cited by 38 publications

References 51 publications

Heavy neutral leptons at ANUBIS

Heavy neutral leptons at ANUBIS

Searching for a light Z′ through Higgs production at the LHC

Seeking for sterile neutrinos with displaced leptons at the LHC

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