Rotation-invariant observables in parity-violating decays of vector particles to fermion pairs

Details Rotation-invariant observables in parity-violating decays of vector particles to fermion pairs Rotation-invariant observables in parity-violating decays of vector particles to fermion pairs

2010-10-07

arxiv.org/abs/1010.1552v1

Phys.Rev.D82:096002,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

To be published in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.82.096002

The di-fermion angular distribution observed in decays of inclusively produced vector particles is characterized by two frame-independent observables, reflecting the average spin-alignment of the produced particle and the magnitude of parity violation in the decay. The existence of these observables derives from the rotational properties of angular momentum eigenstates and is a completely general result, valid for any J=1 state and independent of the production process. Rotation-invariant formulations of polarization and of the decay parity-asymmetry can provide more significant measurements than the commonly used frame-dependent definitions, also improving the quality of the comparisons between the measurements and the theoretical calculations.

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