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

Autor: E. Di Salvo, Ziad Ajaltouni
Přispěvatelé: Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Particle physics
angular distribution: asymmetry
Physics and Astronomy (miscellaneous)
Physics beyond the Standard Model
FOS: Physical sciences
lcsh:Astrophysics
01 natural sciences
High Energy Physics - Phenomenology (hep-ph)
lcsh:QB460-466
0103 physical sciences
intermediate boson
lcsh:Nuclear and particle physics. Atomic energy. Radioactivity
invariance: CPT
010306 general physics
numerical calculations
Engineering (miscellaneous)
Boson
Physics
010308 nuclear & particles physics
new physics
High Energy Physics::Phenomenology
Observable
Fermion
Polarization (waves)
final-state interaction
Formalism (philosophy of mathematics)
High Energy Physics - Phenomenology
meson: polarization
Amplitude
meson: decay
[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
lcsh:QC770-798
High Energy Physics::Experiment
decay: weak interaction
time reversal: violation
Zdroj: Eur.Phys.J.C
Eur.Phys.J.C, 2019, 79 (12), pp.989. ⟨10.1140/epjc/s10052-021-09284-5⟩
Eur.Phys.J.C, 2019, 79 (12), pp.989. ⟨10.1140/epjc/s10052-019-7506-9.⟩
European Physical Journal
European Physical Journal C: Particles and Fields
European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2019, 79 (12), pp.989. ⟨10.1140/epjc/s10052-021-09284-5⟩
European Physical Journal C: Particles and Fields, Vol 79, Iss 12, Pp 1-10 (2019)
ISSN: 1434-6044
1434-6052
DOI: 10.1140/epjc/s10052-021-09284-5⟩
Popis: We consider two-body and quasi-two-body decays of the type $f_1 \to f_2 B$, 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.
19 pages
Databáze: OpenAIRE
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