Testing neutrino masses in LHC

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