Heavy Neutral Leptons at FASER
By F. Kling, S. Trojanowski. 2018
143 citations recorded by the source corpus.
We study the prospects for discovering heavy neutral leptons at ForwArd Search ExpeRiment, or FASER, the newly proposed detector at the LHC. Previous studies showed that a relatively small detector with ~10 m length and ~1 m cross sectional area can probe large unconstrained parts of parameter space for dark photons and dark Higgs bosons. In this work we show that FASER will also be sensitive to heavy neutral leptons that have mixing angles with the active neutrinos that are up to an order of magnitude lower than current bounds. In particular, this is true for heavy neutral leptons produced dominantly in $B$ meson decays, in which case FASER's discovery potential is comparable to the proposed SHiP detector. We also illustrate how the search for heavy neutral leptons at FASER will be complementary to ongoing searches in high-$p_T$ experiments at the LHC and can shed light on the nature of dark matter and the process of baryogenesis in the early Universe.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/5322c461d9c31e8a868d589954c6cf269c325f4d
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In Nuclear and High Energy Physics
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Citations in the corpus
- Beyond the Standard Model Physics at the HL-LHC and HE-LHC (2018, methodology): “The Beyond Collider experiments are AL3X (A Laboratory for Long-Lived eXotics) [319], CODEX-b (COmpact Detector for EXotics at LHCb) [320], FASER (ForwArd Search ExpeRiment) [321–323], milliQan [324,325], MATHUSLA (MAssive Timing Hodoscope for Ultra Stable neutraL pArticles) [326,327], and SHiP (Sea”
- Physics beyond colliders at CERN: beyond the Standard Model working group report (2019, background): “The same mass range could also be probed by a FASER2 [81], CODEX-b [112] and MATHUSLA200 [94].”
- Neutrinoless double beta decay versus other probes of heavy sterile neutrinos (2019, background): “7, we show the expected sensitivity of AL3X, FASER– 2 [78] and MATHUSLA [79] for illustration.”
- Deep Underground Neutrino Experiment (DUNE), Far Detector Technical Design Report, Volume II: DUNE Physics (2020, methodology): “The sensitivity for DUNE ND is compared to the predictions of future experiments, SBN [516] (blue), SHiP [517] (red), NA62 [518] (green), MATHUSLA [519] (purple), and the Phase II of FASER [520].”
- Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider (2019, background): “The sensitivity of LHC experiments to HNLs is complementary to that of fixed-target experiments which can probe lower couplings thanks to high-intensity beams albeit at lower mass ranges (i.e., targeting HNLs from c and b decays).”
- FASER’s physics reach for long-lived particles (2018, methodology): “For this, it is necessary to evaluate FASER’s sensitivity in specific models [7, 26–35].”