- #1

cairoliu

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Wikipedia only tells neutrino spin 1/2, but no tell parity sign: positive or negative?

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- #1

cairoliu

- 51

- 3

Wikipedia only tells neutrino spin 1/2, but no tell parity sign: positive or negative?

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- #2

PeterDonis

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What do you mean by "parity sign"?

- #3

cairoliu

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Because I know protons, neutron, electron all 1/2+ spin with positive sign of parity, but only know neutrino 1/2 spin.What do you mean by "parity sign"?

- #4

PeterDonis

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Because I know protons, neutron, electron all 1/2+ spin with positive sign of parity

Again, what do you mean by "positive sign of parity"? Please give a reference.

- #5

cairoliu

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Again, what do you mean by "positive sign of parity"? Please give a reference.

I need know neutrino's Jπ, 1/2+ or 1/2- ? At least J = 1/2 is sure, but π = +1 or -1?

- #6

cairoliu

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- #7

PeterDonis

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- #9

cairoliu

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I imagine it as left hand ruled direction of angular momentum vector. right or wrong?

Anyway momentum conserves.

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- #11

cairoliu

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Sorry, no idea, please teach me.parity transformationof the left-handed neutrino is. Not what the left-handed neutrino is.

For the neutron decay: n -> p + e + anti-neutrino

If parity of anti-neutrino = +1, then left = +1 = right = (+1)*(+1)*(+1) = +1.

But parity not conserved in beta decay weak interaction, then it seems the parity of anti-neutrino = -1, then left not equal right. Just confused.

- #12

cairoliu

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Thanks for your answer.

Last little confused:

"do not have a definite parity" means parity of neutrino could be +1 or -1 both possible?

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- #14

cairoliu

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- #15

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- #16

PeterDonis

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I like to think symbolically and mathematically, and let equation itself tell whether parity conserve.

The equations governing the weak interactions of neutrinos are easily found in textbooks or online.

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