scholarly journals Muon Decay

2021 ◽  
Author(s):  
Wulf Fetscher
Keyword(s):  
Time Reversal ◽  
Muon Decay ◽  
Transverse Polarization ◽  
Scalar Coupling ◽  
Precision Measurements ◽  
Upper Limits ◽  
Reversal Invariance ◽  
Decay Parameters ◽  
First Time ◽  
Decay Asymmetry

The decay of the muon has been studied at PSI with several precision measurements: The longitudinal polarization P_{\mathrm{L}}(E)PL(E) with the muon decay parameters \xi'ξ′, \xi''ξ″, the Time-Reversal Invariance (TRI) conserving transverse polarization P_{\mathrm{T_{1}}}(E)PT1(E) with the muon decay parameters \etaη, \eta''η″, the TRI violating transverse polarization P_{\mathrm{T_{2}}}(E)PT2(E), with \alpha'/Aα′/A, \beta'/Aβ′/A and the muon decay asymmetry with P_{\mu}\xiPμξ. The detailed theoretical analysis of all measurements of normal and inverse muon decay has led for the first time to a lower limit |g^{V}_{LL}| > 0.960|gLLV|>0.960 (“V-AV−A”) and upper limits for nine other possible complex couplings, especially the scalar coupling |g^{S}_{LL}| < 0.550|gLLS|<0.550 which had not been excluded before.

Polarized muon decay: Measurement of the polarization vector of the decay positrons as a test of time reversal invariance

2003 ◽  
Vol 721 ◽  
pp. C457-C460 ◽  
Author(s):  
W. Fetscher ◽  
K. Bodek ◽  
A. Budzanowski ◽  
N. Danneberg ◽  
C. Hilbes ◽  
...  
Keyword(s):  
Time Reversal ◽  
Polarization Vector ◽  
Muon Decay ◽  
Time Reversal Invariance ◽  
Reversal Invariance ◽  
Decay Measurement

scholarly journals Measurement of the transverse polarization of electrons emitted in neutron decay – nTRV experiment

2021 ◽  
Author(s):  
Kazimierz Bodek ◽  
Adam Kozela
Keyword(s):  
Standard Model ◽  
Time Reversal ◽  
Correlation Coefficients ◽  
Relative Strength ◽  
Transverse Polarization ◽  
Scalar Coupling ◽  
Beyond The Standard Model ◽  
Coupling Constant ◽  
Scalar Coupling Constant ◽  
The Standard Model

This paper recalls the main achievements of the nTRV experiment which measured two components of the transverse polarization (\sigma_{T_{1}}σT1, \sigma_{T_{2}}σT2) of electrons emitted in the \betaβ-decay of polarized, free neutrons and deduced two correlation coefficients, RR and NN, that are sensitive to physics beyond the Standard Model. The value of time-reversal odd coefficient RR, 0.004\pm±0.012\pm±0.005, significantly improved limits on the relative strength of imaginary scalar coupling constant in the weak interaction. The value obtained for the time-reversal even correlation coefficient NN, 0.067\pm±0.011\pm±0.004, agrees with the Standard Model expectation, providing an important sensitivity test of the electron polarimeter. One of the conclusions of this pioneering experiment was that the transverse electron polarization in the neutron \betaβ-decay is worth more systematic exploring by measurements of yet experimentally not attempted correlation coefficients such as HH, LL, SS, UU and VV. This article presents a brief outlook on that questions.

TIME REVERSAL EFFECTS IN MUON DECAY

1957 ◽  
Vol 35 (10) ◽  
pp. 1199-1203 ◽  
Author(s):  
Robert T. Sharp ◽  
Glen Bach
Keyword(s):  
Electron Spin ◽  
Time Reversal ◽  
Muon Spin ◽  
Muon Decay ◽  
Transverse Polarization ◽  
Dependent Term ◽  
Two Component ◽  
Neutrino Theory

Expressions are given for the distribution of electrons emitted in the decay of aligned muons as a function of their energy, direction, and spin. The two-component neutrino theory of Yang and Lee is used, and two cases are considered: (i) neutrino and antineutrino emitted; (ii) two neutrinos emitted. Various correlation terms arise as a result of the inclusion of electron spin. Among these is a time reversal dependent term whose presence would be evinced by asymmetry in a transverse polarization of electrons emitted at right angles to the muon spin.

Muon decay: Measurement of the transverse e+ polarization and its implications on GF and time reversal invariance

2007 ◽  
Author(s):  
W. Fetscher ◽  
K. Bodek ◽  
N. Danneberg ◽  
L. Jarczyk ◽  
K. Kirch ◽  
...  
Keyword(s):  
Time Reversal ◽  
Muon Decay ◽  
Time Reversal Invariance ◽  
Reversal Invariance ◽  
Decay Measurement

scholarly journals From Loschmidt daemons to time-reversed waves

2016 ◽  
Vol 374 (2069) ◽  
pp. 20150156 ◽  
Author(s):  
Mathias Fink
Keyword(s):  
Wave Propagation ◽  
Time Reversal ◽  
Degrees Of Freedom ◽  
Point Of View ◽  
Propagation Time ◽  
Reversal Invariance ◽  
Spatial Boundary ◽  
Dual Approaches ◽  
Spatio Temporal

Time-reversal invariance can be exploited in wave physics to control wave propagation in complex media. Because time and space play a similar role in wave propagation, time-reversed waves can be obtained by manipulating spatial boundaries or by manipulating time boundaries. The two dual approaches will be discussed in this paper. The first approach uses ‘time-reversal mirrors’ with a wave manipulation along a spatial boundary sampled by a finite number of antennas. Related to this method, the role of the spatio-temporal degrees of freedom of the wavefield will be emphasized. In a second approach, waves are manipulated from a time boundary and we show that ‘instantaneous time mirrors’, mimicking the Loschmidt point of view, simultaneously acting in the entire space at once can also radiate time-reversed waves.

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