Post on 17-Jan-2016
description
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