Both the electrical neutrality and small mass of the neutrino can be explained by string theory.  Tiny Planck-sized strings vibrate in certain ways, in accordance with the laws of physics.  Each different way a string can vibrate makes a different kind of particle that behaves in different ways.  The string vibration that corresponds to neutrinos (generally speaking, because there are several different kinds of neutrinos) is such that the resulting particle has extremely small mass and is electrically neutral.

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I think charge has something to do with the spin of the particle?

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If you're not happy with the string theory explination and you want to think about it as a point particle

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No, point particle theories have major problems, and have been scrapped long ago.  

You can't think of some particles as strings that are being viewed "from far away", such that they appear as points, and think as other particles as being a true point particle.  If you view anything from far enough away, it'll look like a zero-dimensional point, regardless of its true dimensions.

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I think charge has something to do with the spin of the particle?

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Spin is another fundamental property, different from charge.  Basically, quantum spin is a measure of how fast all particles of a certain type spin.  For example, all electrons have a spin value of ½.  If an electron did not have a spin of ½, it would not be an electron.  Particles with spin never slow down or lose momentum, unlike spinning things at the macroscopic level.

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Thanks.

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Instead of string theory can we talk about something that is able to be tested and therefore within the realm of science and not fantasy?

Thanks.

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If you have a better theory that fits all of the available data, then, by all means, submit it to a science journal.  You'll be the new Einstein.

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