Constraints from the CHARM experiment on heavy neutral leptons with tau mixing

  title={Constraints from the CHARM experiment on heavy neutral leptons with tau mixing},
  author={Iryna Boiarska and Alexey Boyarsky and Oleksii Mikulenko and Maksym Ovchynnikov},
  journal={Physical Review D},
We re-analyze the results of the searches for Heavy Neutral Leptons (HNLs) by the CHARM experiment. We study HNL decay channel N → e+e−ν/μ+μ−ν and show that, in addition to the constraints on the HNL’s mixings with νe or νμ, the same data also implies limits on the HNLs that mix only with ντ and have masses in the range 380 MeV < mN . 1.6 GeV the region in the parameter space that was considered in the literature as a target for HNLs searches. 
1 Citations

Figures and Tables from this paper

Characterizing Heavy Neutral Fermions via their Decays
Many extensions of the Standard Model of particle physics contain new electrically-neutral fermions. Should one of these particles be discovered, questions will naturally arise regarding its nature.Expand


Improved BBN constraints on Heavy Neutral Leptons.
We constrain the lifetime of thermally produced Heavy Neutral Leptons (HNLs) from primordial nucleosynthesis. We show that even a small fraction of mesons present in the primordial plasma leads toExpand
An allowed window for heavy neutral leptons below the kaon mass
Abstract The extension of the Standard Model with two gauge-singlet Majorana fermions can simultaneously explain two beyond-the-Standard-model phenomena: neutrino masses and oscillations, as well asExpand
Phenomenology of GeV-scale heavy neutral leptons
A bstractWe review and revise phenomenology of the GeV-scale heavy neutral leptons (HNLs). We extend the previous analyses by including more channels of HNLs production and decay and provide withExpand
Search for neutral heavy leptons produced in Z decays
Weak isosinglet Neutral Heavy Leptons (m) have been searched for using data collected by the DELPHI detector corresponding to 3:3 106 hadronic Z0 decays at LEP1. Four separate searches have beenExpand
Sensitivity of the SHiP experiment to Heavy Neutral Leptons
A bstractHeavy Neutral Leptons (HNLs) are hypothetical particles predicted by many extensions of the Standard Model. These particles can, among other things, explain the origin of neutrino masses,Expand
Limits on the mixing of tau neutrino to heavy neutrinos
Abstract Limits at 90% c.l. on the square of the mixing strength | U τ 4 | 2 between ν τ and a mostly isosinglet heavy neutrino with mass in the range 10–290 MeV/ c 2 are reported. The results wereExpand
Dark scalars and heavy neutral leptons at DarkQuest
The proposed DarkQuest beam dump experiment, a modest upgrade to the existing SeaQuest/SpinQuest experiment, has great potential for uncovering new physics within a dark sector. We explore both theExpand
The νMSM, dark matter and baryon asymmetry of the universe
We show that the extension of the standard model by three right-handed neutrinos with masses smaller than the electroweak scale (the νMSM) can explain simultaneously dark matter and baryon asymmetryExpand
Searches for atmospheric long-lived particles
Long-lived particles are predicted in extensions of the Standard Model that involve relatively light but very weakly interacting sectors. In this paper we consider the possibility that some of theseExpand
μ→eγ at a rate of one out of 109 muon decays?
It is proposed that lepton number conservation, purely left-handed charged weak currents and vanishing neutrino masses are a limiting case of a parity symmetric SU2L × SUR × U2V gauge theory.Expand