Search for Heavy Majorana Neutrino in Same-Sign Dilepton Channel

Non-zero neutrino masses require the introduction of right-handed field components for the neutrino. Generating sub-eV neutrino masses through Yukawa interactions requires extremely small coupling constants, thus leading to an aesthetically unpleasing theory. Using Type-I seesaw mechanism, light neutrino masses and mixings are generated naturally by introducing heavy Majorana neutrino (HMN) terms. We study the production and decay of HMN using a Lagrangian of effective operators in LHC ${\it pp}$ collisions at ${\sqrt s}$ = 7 TeV. This model independent approach allows for a broader and more reliable view of expected physics for TeV-scale Majorana neutrinos. We present a search for HMN with a total integrated luminosity of 35 $\it pb$${^{-1}}$ recorded with the ATLAS detector.