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Thread: a few questions on neutrinos:does its mass determine a new elementary category ?

  1. #1 a few questions on neutrinos:does its mass determine a new elementary category ? 
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    1) so far we had (besides photons)
    two kinds of elementary particles : mass with negative or positive charge.
    Neutrons are not elementary but just a combination of the two types.
    But neutrino is smaller then electron, ergo it must be elementary.
    Doesn't this fact rise serious theoretical problems?

    2)it is its own antiparticle. Shouldn't this mean that two opposite neutrinos should be annihilate into an X-r?
    or it is a loose definition

    3) can you create neutrinos from photons?
    or only from neutrons?

    4) what is its estimate size /radius ,(is it correct to put it about 10^ -17/18 m?)


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  3. #2  
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    Quote Originally Posted by peterpan View Post
    1) so far we had (besides photons)
    two kinds of elementary particles : mass with negative or positive charge.
    Neutrons are not elementary but just a combination of the two types.
    But neutrino is smaller then electron, ergo it must be elementary.
    Doesn't this fact rise serious theoretical problems?
    Yeah, but we do have those photons, so there is a precedent for charge-less entities with no substructure.

    2)it is its own antiparticle. Shouldn't this mean that two opposite neutrinos should be annihilate into an X-r?
    or it is a loose definition


    Apparently antiparticles are more complicated than just charge reversal. There is such a thing as an antineutrino.



    http://en.wikipedia.org/wiki/Neutrino#Antineutrinos]Error[/URL]


    Some clocks are only right twice a day, but they are still right when they are right.
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  4. #3  
    Moderator Moderator Janus's Avatar
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    There are three flavors of neutrino. The electron-neutrino, (associated with neutron decay), the Muon-neutrino( associated with muon decay) and the tau-neutrino (associated with tau decay.)

    I know of nothing that predicts that all fundamental particles should have a charge, so the lack of charge for the neutrino poses no problem.
    "Men are apt to mistake the strength of their feelings for the strength of their argument.
    The heated mind resents the chill touch & relentless scrutiny of logic"-W.E. Gladstone


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  5. #4  
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    Its of the lepton family of elementary particles as opposed to the boson family of force carriers. It is predicted by the standard model but only an upper mass limit is indicated, I believe.
    Myself I had always assumed they would be found to be massless ( I guess I'm wrong again ) because they travel extremely close to the speed of light.
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  6. #5  
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    Quote Originally Posted by Janus View Post
    ,
    .....so the lack of charge for the neutrino poses no problem.
    points 1 and 2 of my thread are closely related.
    flavours are irrelevant here, as they refer only to the level of energy
    now the point is:
    a positron and an electron attract each other and annihilate into a ray of EMR
    a neutrino and an antineutrino do not attract each other
    and ,if forced one onto the other , do they annihilate in an X-ray?
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