Polarization in (quasi-)two-body decays and new physics - Archive ouverte HAL
Article Dans Une Revue European Physical Journal C: Particles and Fields Année : 2019

Polarization in (quasi-)two-body decays and new physics

Résumé

We consider two-body and quasi-two-body decays of the type $f_1 \rightarrow f_2 B$, where $f_1$ and $f_2$ are spin-1/2 fermions and B a spin-0 or spin-1 boson. After recalling the non-covariant formalism for decay amplitudes, we derive the expression of the differential decay width and of the polarizations of the final spinning particles, both on- and off-shell. We find an intriguing geometrical interpretation of the results about the polarization. We also illustrate some methods for measuring the polarizations of the resonances and for optimizing data analysis. Then we propose applications to semi-leptonic weak decays, with a major attention to the T-odd component of the polarization, this may help to find, simultaneously, possible time-reversal violations and hints to physics beyond the standard model. We suggest also a CPT test. Last, we discuss some T-odd observables for the production process of $f_1$ and for the study of the strong final state interactions of non-leptonic decays.

Dates et versions

hal-02116560 , version 1 (01-05-2019)

Identifiants

Citer

Z.J. Ajaltouni, E. Di Salvo. Polarization in (quasi-)two-body decays and new physics. European Physical Journal C: Particles and Fields, 2019, 79 (12), pp.989. ⟨10.1140/epjc/s10052-021-09284-5⟩. ⟨hal-02116560⟩
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