Abstract
A general method will be described to derive the angular distribution in the two-body decay of a particle with spin. Rotations of systems with angular momenta have already been introduced in Sect. 6.1.
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- 1.
For a discussion on pure and mixed states and on the density matrix, see the Appendix F.
- 2.
The weight w describes the angular distributions only. The final state probability is obtained by multiplying with phase space factors and Breit-Wigner amplitudes for all decay steps.
- 3.
We now know that the asymmetry parameter α Ω in Ω−→ ΛK − is rather small (1.78 ± 0.25)% [5]. Hence the angular distribution of the Λ would be nearly isotropic, even if the Ω− hyperons were fully polarized.
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Amsler, C. (2018). Decay Angular Distribution and Spin. In: The Quark Structure of Hadrons. Lecture Notes in Physics, vol 949. Springer, Cham. https://doi.org/10.1007/978-3-319-98527-5_18
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DOI: https://doi.org/10.1007/978-3-319-98527-5_18
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