A TESTABLE MODEL OF A 17 keV TAU NEUTRINO
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We discuss an extension of the standard model with a local symmetry of Le−Lμ and a global symmetry of Lτ to incorporate a 17 keV Dirac tau neutrino. A massive neutral gauge boson (AX) and a majoron (J) are present by breaking the symmetries spontaneously. The tau neutrino, with a life-time of the order 10−3 s, will decay by emitting an electron and a majoron. Tau will also decay into an electron and a majoron with a branching ratio as large as 10−4. The breaking scale of Le−Lμ symmetry can be as low as 700 GeV. Hence, AX can be produced in LEP II in the near future.
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2018 ◽
Vol 33
(32)
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pp. 1850194
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2015 ◽
Vol 24
(07)
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pp. 1530019
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2014 ◽
Vol 35
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pp. 1460390
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