We consider two-body and quasi-two-body decays of the type
f
1
→
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.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
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.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Erratum to: Polarization in Ajaltouni, Z. J; Di Salvo, E
The European physical journal. C, Particles and fields,
06/2021, Letnik:
81, Številka:
6
Journal Article
Recenzirano
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
We illustrate some tests which may shed light on physics beyond the Standard Model. Some of them are especially sensitive to possible signals of new physics.
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