Towards Majorana neutrino spectroscopy M. Yoshimura

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Presentation transcript:

Towards Majorana neutrino spectroscopy M. Yoshimura Why atoms ? Another or perhaps a unique way of Majorana detection　 Measurement of absolute mass scale hep-ph/0611362 Possibility of detecting relic neutrino hep-ph/0703019

Significance of discovering Majorana neutrino Neutral fermions follow economic Majorana eq or the same Dirac eq as charged ? Leading to lepton number violation and lepto-genesis 　　 particle = anti-particle missing partner for leptogenesis Contributing to better understanding of seesaw mechanism and GUT

M vs D

Merits and demerits of atomic process Infinitely many small energies Small pair emission rate How to enhance; resonance by energy input strong field

Majorana ｖｓ Dirac equations: chirally projected solutions

Unique signature of Majorana = interference of identical fermions Effective only for pair emission Appear only (ii) threshold; proportional to m_i^2 Can be positive or negative Direct test of Majorana nature 　cf LV in

2 promissing atomic processes Low level metastable atoms laser irradiated Rydberg atoms microwave irradiated (not discussed here)

Neutrino pair emission from laser irradiated metastable state

Rough estimate of rate

Refinement

Threshold behavior 6 channels

Numerical estimate w.Y. Okabayashi Input angles and masses

Total rate / rate for massless Several % mass effects for 0.5 eV

Large mass effects

Theta_12 effect

Observability of relic neutrino w. T. Takahashi hep-ph/0703019 Pauli blocking effect

Magnitude of Pauli blocking

m_1 dependence for standard 1.9 K

Temperature measurement possible ?

12 threhold

Early universe probed by relic neutrino Decoupling temperature Early universe after neutrino decoupling and before e^+ annihilation Large lepton asymmetry Constraint on sterile neutrino Surprizes ?

Measuring the lepton asymmetry Definitive test of leptogenesis Extremely difficult, (12) or (13) threshold most promissing

Experiments are not easy Discovery of atomic pair emission Mass measurement M/D distinction Relic detection

Summary Discussed laser irradiated pair emission to determine the magnitude and the nature of neutrino masses Identical particle effect of Majorana particles Neutrino mass spectroscopy towards 1 meV range Relic neutrino search