Bled 2024: International Workshop on Lepton Number Violation

17 Jun 2024, 09:00 → 23 Jun 2024, 17:00 Europe/Ljubljana

Plemljeva villa

Breaking Lepton Number in High Energy Direct Searches 

 

 

Monday, 17 June

18:00 → 20:00 Arrival and welcome

Tuesday, 18 June

09:30 → 10:15 Didar Dobur: Experimental Search for Heavy Neutral Leptons at LHC

HNL_BLED_2024 Didar Dobur.pdf

10:15 → 10:45 Kavica break

10:45 → 11:30 Jan Hajer: Heavy Neutrino-Antineutrino Oscillations

main Jan Hajer.pdf

11:30 → 12:15 Arsenii Titov: Long-lived HNLs at the LHC: four-fermion operators

HNL_EFT_BLED_2024_Titov Arsenii Titov.pdf

12:15 → 14:15 Lunch

14:15 → 15:00 Richard Ruiz: Light mesons from light heavy neutrinos at colliders

In the context of the Phenomenological Type I Seesaw, we investigate the LHC’s sensitivity to exclusive, mesonic decay modes of long-lived, light (Dirac and Majorana) heavy neutrinos N when they are produced in the decays of W bosons. We present a new framework that combines massless QCD to describe N ’s production up to NLO in QCD via weak bosons with a low-energy effective field theory to describe N ’s decays to mesons. We provide a prescription for fast, numerical determination of N ’s partial and total widths for any mass and accounts for mesonic decay modes.

rruiz_BLED24_HeavyNMeson Richard.pdf

15:00 → 15:30 Kavica break

15:30 → 17:00 Discussion

Wednesday, 19 June

09:30 → 10:15 Fabrizio Nesti: something with left-right symmetry at colliders

10:15 → 10:45 Kavica break

10:45 → 11:30 Jonathan Kriewald: What's next in Left-Right

Bled2024.pdf

11:30 → 12:15 Antonio Sidoti: Lepton Number Violation searches in ATLAS

Lepton number is conserved in the Standard Model, therefore, any evidence for its violation would indicate the existence of new physics. This talk presents a review of the latest Lepton Number Violation searches performed by ATLAS at the LHC concerning Lepton Number Violation based on Run2 data.

bled_2024_SIDOTI_ATLAS_3 Antonio Sidoti.pdf

12:15 → 14:15 Lunch

15:00 → 15:30 Kavica break

15:45 → 17:30 Boat Trip to the Bled Island

IMG_6070.JPG

TripToBledIsland.pdf

TripToBledIsland.pdf

19:00 → 22:00 Workshop Dinner

Thursday, 20 June

10:15 → 11:00 Jernej Debevc: Experimental searches for type-II and type-III seesaw heavy leptons with the ATLAS detector

seesawSearchATLAS_BledWorkshop_JernejDebevc Jernej Debevc.pdf

11:00 → 11:30 Kavica break

11:30 → 12:15 Lara Čalić: Type II, Type III and tau fakes and background estimation (ABCD method)

BLED_conference2024FinalV_LC Lara Calic.pdf

12:15 → 14:15 Lunch

14:15 → 15:00 Suchita Kulkarni: Exploring neutrino phenomenology in B-L extensions

Kulkarni_Bled_workshop.pdf

15:00 → 15:30 Kavica break

15:30 → 17:00 Discussion

Friday, 21 June

09:30 → 10:15 Blaž Leban: LRSM: Search for Doubly Charged Higgs bosons with the ATLAS detector + LNV Higgs decays

Blaz Leban - Search for Doubly Charged Higgs bosons with the ATLAS detector and LNV Higgs decays Blaž Leban.pdf

10:15 → 10:45 Kavica break

10:45 → 11:30 Daniele Barducci: The effective theory of right-handed neutrinos at collider

The see-saw model is the minimal framework which is able to explain the observed pattern of neutrino masses and oscillations. Right-handed neutrinos around the GeV scale are an ideal target for high-energy and high-intensity experiments. While intense experimental efforts have deeply tested this hypothesis, there remain the possibility that the origin of the neutrino sector lies in a more involved theory beyond the Standard Model, whose effect at the electroweak scale can be parametrized in terms of effective operators involving Standard Model and right-handed neutrino fields. I will discuss the associated phenomenology and show the prospects for detecting right-handed neutrinos effective interactions at present and future experimental facilities.

barducci_BLED Daniele Barducci.pdf

11:30 → 12:15 Patrick Bolton: Probing Heavy Neutrino Magnetic Moments at the LHC Using Non-Pointing Photon Signatures

patrickbolton_talk_Bled.pdf

12:15 → 14:15 Lunch

15:00 → 15:30 Kavica break

15:30 → 17:00 Discussion

Saturday, 22 June

09:30 → 10:15 Chayan Majumdar: Exploring Alternative Left-Right Model: Neutrinoless double beta decay and Leptogenesis

Left-Right (LR) theories are one of the successful beyond Standard Model scenarios to provide a unified explanation to the origin of small neutrino masses and low-energy parity violation. However, conventional LR theory faces stringent constraints due to Flavor Changing Neutral Currents (FCNCs). We have explored an Alternative LR model (ALRM) that avoids FCNC constraints and introduces new physics signatures in decay and leptogenesis. We have shown that the new type of vector-scalar diagram contributes significantly in Neutrinoless Double Beta decay (NDBD). When the relevant charged Higgs boson has mass around 200 GeV, the half-life of decaying nucleus is approximately 10^{26} years for both Ge-76 and Xe-136, which falls well within the anticipated sensitivity of future NDBD experiments. Moreover, this model has the potential to explain the correct baryogengesis, even in the presence of small Dirac CP phase in right-handed neutrino sector and without requiring any more fine-tuning, by invoking the resonant leptogenesis.

Chayan_BLED24 chayan majumdar.pdf

10:15 → 10:45 Kavica break

10:45 → 11:30 Chandan Hati: Lepton Number Violation Beyond Dimension 5 Weinberg Operator

Bled_2024_CH Chandan Hati.pdf

11:30 → 12:00 Closing and Farewell