FIPs 2022 Workshop

Session

Heavy Neutral Leptons and possible connections with active neutrino physics

Oct 20, 2022, 4:50 PM

500/1-001 - Main Auditorium (CERN)

Conveners

Heavy Neutral Leptons and possible connections with active neutrino physics

• Albert De Roeck (CERN)
• Jacobo Lopez Pavon (IFIC, CSIC-Universitat de València)

Heavy Neutral Leptons and possible connections with active neutrino physics

• Albert De Roeck (CERN)
• Marco Drewes (Universite Catholique de Louvain (UCL) (BE))

29. HNLs and their connection with 0nubb decays: theory overview

Frank Deppisch

10/20/22, 4:50 PM

30. 0nubb decays: experimental overview

Ruben Saakyan (University of London (GB))

10/20/22, 5:20 PM

31. NHL's and light oscillating neutrinos in 2022

Maria Concepcion Gonzalez-Garcia (YITP, Stony Brook and ICREA, Barcelona and Barcelona U.)

10/20/22, 5:50 PM

32. Searches for HNLs with neutrino telescopes (postponed to tomorrow session)

Pilar Coloma (Instituto de Fisica Teorica UAM/CSIC)

10/20/22, 6:20 PM

135. Searches for HNLs with neutrino telescopes

Pilar Coloma (Instituto de Fisica Teorica UAM/CSIC)

10/21/22, 9:00 AM

36. Prospects for the measurement of the absolute neutrino masses in cosmology

Yvonne Wong

10/21/22, 9:25 AM

56. The HIBEAM experiment to look for induced conversions of neutrons to sterile neutrons and antineutrons

David Anthony Milstead (Stockholm University (SE))

10/21/22, 9:55 AM

37. New results from MicroBooNE

Stefan Soldner-Rembold (University of Manchester (GB))

10/21/22, 10:15 AM

46. PIONEER at PSI Prospects for Rare Pion Decays

Bob Velghe (TRIUMF (CA)), Douglas Andrew Bryman (University of British Columbia (CA))

10/21/22, 10:30 AM

39. FIPs searches at FCC-ee

Giulia Ripellino (Uppsala University (SE))

10/21/22, 11:15 AM

45. Prospects at DUNE near detectors and short baseline experiments in US

Joachim Kopp (CERN)

10/21/22, 11:30 AM

38. New results from ATLAS, CMS, LHCb

Joscha Knolle (Ghent University (BE))

10/21/22, 11:50 AM

41. Heavy Neutral Leptons: the FIP Physics Centre approach

Juraj Klaric (Universite Catholique de Louvain (UCL) (BE))

10/21/22, 12:15 PM

47. New results from Babar

Sophie Charlotte Middleton (Lund University (SE))

10/21/22, 12:40 PM

44. Conclusions and Outlook

10/21/22, 12:55 PM

73. Bounds on right handed neutrinos from observable leptogenesis

Stefan Sandner (IFIC)

The talk will focus on the testability prospects of the minimal GeV-scale Type-I seesaw model and the associated leptogenesis mechanism within future experiments as SHiP and FCC-ee.
To this end we classify the parameter space according to associated washout regimes.
This allows us to derive an accurate analytical approximation to the solution of the kinetic equations, exposing the...

101. Constraints on heavy neutral leptons from the BEBC WA66 beam dump experiment

Giacomo Marocco

We revisit the search for heavy neutral leptons using BEBC in the 1982 proton beam dump experiment at CERN, focussing on those heavier than the kaon and mixing only with the tau neutrino, as these are far less constrained than their counterparts with smaller mass or other mixings. Recasting the previous search in terms of this model and including additional production and decay channels yields...

48. Heavy Neutral Leptons: the Snowmass approach

66. Heavy neutrino-antineutrino oscillations at the HL-LHC

Jan Hajer (Universidade de Lisboa)

The Standard Model lacks an explanation for the observed light neutrino oscillations. This can be alleviated by adding at least two right-handed Majorana fermions in order to generate neutrino masses via the seesaw mechanism. These right-handed Majorana fermions can be light enough to be collider accessible as long as they are nearly mass degenerate. These pseudo-Dirac heavy neutral leptons...

103. New limits on heavy neutral leptons with dark forces from neutrino data

Matheus Hostert (Perimeter Institute & University of Minnesota)

The neutrino portal may lead us to a sector of heavy neutral leptons with additional interactions besides mixing with neutrinos.
I will discuss three main developments in constraining such "dark neutrino sectors" using neutrino experiments. Firstly, I present a new generator to simulate neutrino upscattering to HNLs and their subsequent decays.
Secondly, I will discuss new strategies to...

40. Searches for HNLs at extracted beam lines at CERN: NA62, SHADOWS, SHiP

67. Tests of Low-Scale Leptogenesis in Charged Lepton Flavour Violation Experiments

Prof. Serguey Petcov (INFN/SISSA)

We consider low-energy tests of low-scale leptogenesis based on the type I seesaw scenario with three
right-handed
singlet neutrinos $\nu_{l R}$. In this scenario, successful leptogenesis is possible for quasi-degenerate in mass heavy Majorana neutrinos $N_{1,2,3}$,
$M_{1,2,3}\cong M$, $|M_j - M_i|\ll M$, $i\neq j = 1,2,3$,
heavy Majorana neutrino masses $M \sim (0.05 - 7\times 10^4)$...

84. Why interpretation matters in heavy neutral lepton searches: a case study at ATLAS

Jean-Loup Tastet (UAM-IFT)

Even the simplest consistent models of heavy neutral leptons (HNLs) already feature significant complexity, making them impractical for reporting experimental results. In order to keep this complexity under control, experiments usually interpret search results within simplified benchmarks, such as e.g. one HNL coupling to a single lepton flavor. Unfortunately, these benchmarks turn out to be...