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cairoliu
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Wikipedia only tells neutrino spin 1/2, but no tell parity sign: positive or negative?
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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.PeterDonis said:What do you mean by "parity sign"?
cairoliu said:Because I know protons, neutron, electron all 1/2+ spin with positive sign of parity
Jπ always comes together, if Jπ = 1/2+, it means spin = 1/2, parity = +1.PeterDonis said:Again, what do you mean by "positive sign of parity"? Please give a reference.
I imagine it as left hand ruled direction of angular momentum vector. right or wrong?Orodruin said:Also, in addition to what Peter said, what do you imagine that the parity transformation of a left-handed neutrino is?
Sorry, no idea, please teach me.Orodruin said:No, I asked you what you thought the parity transformation of the left-handed neutrino is. Not what the left-handed neutrino is.
Thanks for your answer.PeterDonis said:Ok, then the answer is that neutrinos do not have a definite parity, since neutrinos only interact via weak interactions and weak interactions do not conserve parity.
cairoliu said:I like to think symbolically and mathematically, and let equation itself tell whether parity conserve.
As of now, there is no consensus on the spin-parity of neutrinos. Some experiments have suggested a spin-parity of 1/2+, while others have suggested a spin-parity of 1/2-. Further research and experiments are needed to reach a conclusive answer.
Determining the spin-parity of neutrinos is important because it will help us better understand the nature of these elusive particles. It can also provide insights into the Standard Model of particle physics and potentially lead to new discoveries and advancements in the field.
Scientists use various experimental techniques, such as particle colliders and detectors, to study the interactions of neutrinos. By analyzing the data from these experiments, scientists can infer the spin-parity of neutrinos.
According to the current understanding of the Standard Model, the spin-parity of neutrinos is a fundamental property and does not change. However, some theories propose the existence of sterile neutrinos that could have different spin-parity states.
If the spin-parity of neutrinos is 1/2+, it would support the theory that neutrinos are their own antiparticles. On the other hand, if it is 1/2-, it could challenge this theory and lead to new ideas about the nature of neutrinos. It could also have implications for the search for new physics beyond the Standard Model.