Searches for heavy neutrinos at multi-TeV muon collider: a resonant leptogenesis perspective
Indrani Chakraborty, Himadri Roy, Tripurari Srivastava
Abstract
Abstract In this work, the Standard Model (SM) is extended with two right-handed (RH) neutrinos and two singlet neutral fermions to yield active neutrino masses via (2,2) inverse see-saw mechanism. We first validate the multi-dimensional model parameter space with neutrino oscillation data, obeying the experimental bounds coming from the lepton flavor violating (LFV) decays: $$\mu \rightarrow e \gamma ,~ \tau \rightarrow e \gamma , ~ \tau \rightarrow \mu \gamma $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>μ</mml:mi> <mml:mo>→</mml:mo> <mml:mi>e</mml:mi> <mml:mi>γ</mml:mi> <mml:mo>,</mml:mo> <mml:mspace/> <mml:mi>τ</mml:mi> <mml:mo>→</mml:mo> <mml:mi>e</mml:mi> <mml:mi>γ</mml:mi> <mml:mo>,</mml:mo> <mml:mspace/> <mml:mi>τ</mml:mi> <mml:mo>→</mml:mo> <mml:mi>μ</mml:mi> <mml:mi>γ</mml:mi> </mml:mrow> </mml:math> . Besides we also search for the portion of the parameter space which yield the observed baryon asymmetry of the universe via resonant leptogenesis. Further, we pick up a few benchmark points from the aforementioned parameter space with TeV scale heavy neutrinos and perform an exhaustive collider analysis of the final states: $$2l + E_T \!\!\!\!\!\!/\;\,$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>2</mml:mn> <mml:mi>l</mml:mi> <mml:mo>+</mml:mo> <mml:msub> <mml:mi>E</mml:mi> <mml:mi>T</mml:mi> </mml:msub> <mml:mspace/> <mml:mspace/> <mml:mspace/> <mml:mspace/> <mml:mspace/> <mml:mspace/> <mml:mo>/</mml:mo> <mml:mspace/> <mml:mspace/> </mml:mrow> </mml:math> and $$1\,l + 2j + \not \! E_T $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>1</mml:mn> <mml:mspace/> <mml:mi>l</mml:mi> <mml:mo>+</mml:mo> <mml:mn>2</mml:mn> <mml:mi>j</mml:mi> <mml:mo>+</mml:mo> <mml:mpadded> <mml:mo>⧸</mml:mo> </mml:mpadded> <mml:mspace/> <mml:msub> <mml:mi>E</mml:mi> <mml:mi>T</mml:mi> </mml:msub> </mml:mrow> </mml:math> in multi-TeV muon collider.