Volume 352 -
XXVII International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2019) -
Working Group 6: Spin and 3D Structure
Frame-independent angular distributions as density matrix in-variants
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Pre-published on:
August 20, 2019
Published on:
October 04, 2019
Abstract
The dilepton angular distribution in vector particle decays can be described through a set of five SO(3) rotational-invariant observables. These observables are derived as invariants of the spacial part of the hadronic tensor (density matrix) expressed in terms of angular coefficients. The restrictions on the invariants following from the positivity of the hadronic tensor are obtained. Special cases of SO(2) rotations are considered.
DOI: https://doi.org/10.22323/1.352.0287
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.