Helicity Definition and 57 Threads

Does someone know what the measured probability of finding a right handed electron in the beta decay is?

When it was in the news about neutrinos having mass, I wondered what that meant about left-handed only-ness. You could catch up to one and pass it, or slow one down. More recently, I read that the helicity of the neutrino is invariant but the chirality can still change. What is the...

i am encoutering a problem i use helicity method to caculate six photon amplitude in scalar QED but i don't know explicit form of wave fuction QED . And i need a book with title " R. Gastmans, Ubiquitous photon: Helicity method for QED and QCD" where can i find it? thank you

It is quite difficult to understand, can someone explain what is helicity?

Hi, got an exam tomorrow for particle physics and need a question answered concerning helicity. How would it be possible to determine if a photon had a non-zero rest mass, based on measured helicity values? Thanks Ray

Who is the person that started the concept of magnetic helicity? Is it Gauss? Is it Woltjer? I was trying to obtain a copy of Woltjer's paper of 1958 Proc. Natl Acad. Sci. USA 44 480. Can anybody help me get a copy of this paper? I did purchased a paper by Mitchell A. Berger called "Introduction...

It is well-known that using the Clebsch decomposition of a velocity field, the helicity contained in an any closed vortex tube is zero. Does the converse hold? That is, given zero helicity in any closed vortex tube, does this imply that the velocity field has a Clebsch decomposition?