Search for Pseudoscalar Current Using πo → νν' Decay

Details Search for Pseudoscalar Current Using πo → νν' Decay Search for Pseudoscalar Current Using πo → νν' Decay

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001neph.conf..264f&link_type=abstract

NEUTRINO PHYSICS Its Impact on Particle Physics, Astrophysics and Cosmology. Proceedings of the Carolina Symposium on Neutrino P

Astronomy and Astrophysics

Astrophysics

Scientific paper

The observation of the decay πo → νν' would imply new physics. The pion with a hadronic state of JP = 0- can decay to vacuum, JP = 0+ only via weak axial vector (A) or pseudoscalar (P) operators. Momentum and angular momentum conservation require that the decay neutrinos possess the same helicity. A- and P-interaction favor leptons with opposite and the same helicity, respectively. Therefore, in A-interaction the unfavored helicity -β is proportional to (1 - β) and in the P-interaction the decay rate is proportional to (1 + β). This implies that A-interaction forbids π o -> ν bar {ν } decay for massless neutrinos with β = 1 and that P coupling maximizes decay rate for neutrinos with zero rest mass. Possible search for this decay in high intensity accelerators such as Spallation Neutron Source with suppressed cosmic ray background is discussed.

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