Neutrino physics : phenomenological and theoretical perspectives

Srubabati Goswami

Physical Research Laboratory, Ahmedabad, India

!1 Neutrino: questions

❖ Unknown oscillation parameters - hierarchy, octant of 2-3 mixing angle and CP phase

❖ Absolute neutrino masses — beta decay, cosmology

❖ Nature of neutrinos - Dirac or Majorana — neutrino less double beta decay

❖ Are there more than three flavours — sterile neutrinos

❖ Origin of neutrino masses and mixing — seesaw , flavour symmetry — physics beyond Standard Model

!2 Neutrino Connections

Talk by T. Dutka

Talk by T. Gonzolo, T. Felkl, A. Lackner Baryogenesis via Collider leptogenesis Physics Dark Matter

Talk by Y. Wong Higgs/Vacuum Cosmology stability Neutrinos

Astrophysics/ CLFV Multimessenger Nucl. Physics/ Talk by G.Hill interactions + parallel session

!3 Plan of talk

New physics In neutrino oscillation Neutrinoless double Neutrino beta Flavour Oscillation decay Symmetry Sterile Seesaw Parameters Nus NSI

!4 Neutrino Oscillations

Atmospheric Solar

Accelerator

Reactor

!5 Three Neutrino Paradigm

❖ Measurement of non-zero in reactor experiments three neutrino picture

!6 Current Status

❖ Best-fit in second octant ❖ Preference for NO ❖ disfavoured at more than irrespective of mass ordering ❖ Oscillation experiments not sensitive to Majorana phases

Similar result from Bari and Valencia groups

!7 Degeneracy problem

❖ The main problem in determination of hierarchy, octant and in LBL experiments is due to presence of degeneracies

❖ Degeneracy different set of parameters giving the same probability equally good fit to the data

❖

!8 Ongoing and planned experiments

ORCA Daya-bay JUNO Dune T2K* SK* NOvA* T2HK HK

INO

Beam Reactor Atmospheric PINGU !9 Future Goals

❖ Determination of hierarchy, octant and CP phase

❖ Probing new physics in oscillation experiments

❖ Testing models of flavour symmetry

❖ Synergy between different experiments

!10 Mass hierarchy and CP with DUNE

Hierarchy sensitivity due Matter effects help in removing to enhanced matter effects wrong hierarchy-wrong CP solutions

From: R. Patterson’s slides

!11 Hierarchy: Juno+IceCube upgrade

8 core JUNO + IceCube upgrade/PINGU / (better efficiency for lower energy neutrinos)

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AAAB6XicbVDLSgNBEOyNrxhfUY9eBoPgKez6QI9BLx6jmAckS5idzCZDZmeXmV4hLPkDLx4U8eofefNvnCR70MSChqKqm+6uIJHCoOt+O4WV1bX1jeJmaWt7Z3evvH/QNHGqGW+wWMa6HVDDpVC8gQIlbyea0yiQvBWMbqd+64lrI2L1iOOE+xEdKBEKRtFKD91Jr1xxq+4MZJl4OalAjnqv/NXtxyyNuEImqTEdz03Qz6hGwSSflLqp4QllIzrgHUsVjbjxs9mlE3JilT4JY21LIZmpvycyGhkzjgLbGVEcmkVvKv7ndVIMr/1MqCRFrth8UZhKgjGZvk36QnOGcmwJZVrYWwkbUk0Z2nBKNgRv8eVl0jyreufVy/uLSu0mj6MIR3AMp+DBFdTgDurQAAYhPMMrvDkj58V5dz7mrQUnnzmEP3A+fwCg0I1u hep-ex} 1911.06745 !12 New Physics

❖ Sterile Neutrinos Two appoaches ❖ Non-standard Interactions (NSI)

❖ Non-unitary mixing