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Predictions for energy distribution and polarization of the positron from the polarized muon decay
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In this paper, the pure lepton decay of the polarized muon is considered, accounting for a new tensor interaction which is outside of the Michel local interactions, leading to new energy distribution and polarization of the final charged lepton.Abstract:
The pure lepton decay of the polarized muon is considered, accounting for a new tensor interaction which is outside of the Michel local interactions. This interaction leads to new energy distribution and polarization of the final charged lepton. The presence of such a type of interaction is strongly required for the description of the latest experimental results on the weak radiative pion decay in the full kinematic region. Assuming quark–lepton universality, predictions for a deviation from the Standard Model are made using only one new parameter. They do not contradict the present experimental data and can be verified further in the on-going experiments at PSI and TRIUMF, at least to the level of 3 standard deviations.read more
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Elementary particle theory
TL;DR: An Introduction to Quarks and Partons by F.E. Close as discussed by the authors is a good starting point for a discussion of the relationship between quarks and partons in the context of physics.
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A precision measurement of the muon decay parameter delta
TL;DR: In this article, a measurement of delta was performed using the first physics data recorded by the TWIST experiment at TRIUMF, and the obtained value, delta=0.74964+-0.00066+−0.00112(syst.), is consistent with the Standard Model expectation delta=3/4.
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Can we use hadronic tau decay for V_us determination
TL;DR: In this paper, it was shown that the discrepancy in pion spectral functions extracted from positron-electron annihilation and tau decay leads to different predictions for the muon anomalous magnetic moment.
References
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Precision Tests of the Standard Electroweak Model
TL;DR: In this paper, the standard electroweak model, the weak neutral current, the measurement of electroweak parameters from deep inelastic neutrino scattering, F. Einsweiler, D. Treille future e+e-colliders at high energy and D. Burke.
Journal ArticleDOI
Elementary particle theory
TL;DR: An Introduction to Quarks and Partons by F.E. Close as discussed by the authors is a good starting point for a discussion of the relationship between quarks and partons in the context of physics.