Testing neutrino masses in LHC

Mait Müntel, Andi Hektor, Mario Kadastik, Liis Rebane, Martti Raidal

National Institute of Chemical Physics and Biophysics

Joint seminar on cosmology and astroparticle-physics February 26th and 27th, Tartu Observatory.

Triplet Higgs may be needed to generate Majorana mases to left-hand neutrinos.

The neutrino mass matrix:

Phenomenology

Leptons are described by Lagrangian:

Normal hierarchical light neutrino masses imply

Drell-Yan pair production and Higgs decay

Detector hardware

Detector hardware

Transverse slice through CMS detector

Detector is not ready yet

huge number of events

MC generator (Pythia)

Detector simulation (CMSSW)

++ 4 ,jet

plus SM background

tt, ttZ, ZZ 4 ,jet

4 ´, jet´,

ETmiss

Detector is not ready yet – things are simulated

huge number of events

MC level analysis

Data from detector: Npjet , ETmiss

Selection rules

S0 – < 2.4

S1 – 2 + and 2 - muons or jets

S2 – PT

S3 – Z-tagging

S4 – m++ / m–

Monte Carlo results

Monte Carlo results

Thank You