A theory vade mecum for PSI experiments

Colangelo, Gilberto; Hagelstein, Franziska; Signer, Adrian; Stoffer, Peter

doi:10.21468/scipostphysproc.5.005

Cited by 2 publications

(2 citation statements)

References 127 publications

(123 reference statements)

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“…Starting with the statistical contribution, in the left panel of Figure 9 we show the corresponding upper limit (48) as a function of m X for N b = 10 7 (blue), N b = 10 8 (orange), and N b = 10 9 (green), which is the range of positrons events that can be collected by MEG II. The size of N b is limited by the trigger selections for the µ + → e + γ search, especially the requirement of a photon coincidence in the LXe calorimeter.…”

Section: Meg II Scenariomentioning

confidence: 99%

“…The purpose of this article is to revisit the search for ALPs in the µ + → e + X decay. This will be done in the context of the currently available muon beams at PSI and the underlying low-energy theory [48], but also in view of HIMB [49], the future high-intensity muon beamline at PSI. Contrary to previous analyses, we do not restrict ourselves to cases where the impact of the SM background is marginal.…”

Section: Introductionmentioning

confidence: 99%

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High-precision muon decay predictions for ALP searches

et al. 2023

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We present an improved theoretical prediction of the positron energy spectrum for the polarised Michel decay \mu^+\to e^+ \nu_e\bar{\nu}_\muμ+→e+νeν‾μ. In addition to the full next-to-next-to-leading order correction of order \alpha^2α2 in the electromagnetic coupling, we include logarithmically enhanced terms at even higher orders. Logarithms due to collinear emission are included at next-to-leading accuracy up to order \alpha^4α4. At the endpoint of the Michel spectrum, soft photon emission results in large logarithms that are resummed up to next-to-next-to-leading logarithmic accuracy. We apply our results in the context of the MEG II and Mu3e experiments to estimate the impact of the theory error on the branching ratio sensitivity for the lepton-flavour-violating decay \mu^+\to e^+ Xμ+→e+X of a muon into an axion-like particle XX.

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Section: Meg II Scenariomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-precision muon decay predictions for ALP searches

et al. 2023

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MuCap: Muon Capture on the Proton

Hildebrandt

Petitjean

2021

SciPost Phys. Proc.

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The singlet muon capture rate \Lambda_SΛS on the proton \mu^-\ p \to \nu_\mu~nμ−p→νμn is determined in a high precision lifetime measurement. The main apparatus consists of a new hydrogen time projection chamber as muon detector, developed by PSI, surrounded by cylindrical wire chambers and a plastic scintillator hodoscope as electron detectors. The parameter \Lambda_SΛS is evaluated as the difference between the inverse \mu\,pμp lifetime and that of the free \mu^+μ+. The result \Lambda_S^\text{MuCap} = (715.6 \pm 5.4^\text{stat} \pm 5.1^\text{sys})\,\text{s}^{-1}ΛSMuCap=(715.6±5.4stat±5.1sys)s−1 is in excellent agreement with the prediction of chiral perturbation theory \Lambda_S^{\chi\text{PT}} = (715.4 \pm 6.9)\,\text{s}^{-1}ΛSχPT=(715.4±6.9)s−1. From \Lambda_S^\text{MuCap}ΛSMuCap a recent analysis derives for the induced pseudoscalar coupling g^\text{MuCap}_p = 8.23 \pm 0.83gpMuCap=8.23±0.83 whereas \bar{g}^{\chi\text{PT}}_p = 8.25 \pm 0.25g‾pχPT=8.25±0.25.

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A theory vade mecum for PSI experiments

Abstract: This article gives a compact introduction and overview of the theory underlying the experiments described in the rest of this review.

Cited by 2 publications

References 127 publications

High-precision muon decay predictions for ALP searches

High-precision muon decay predictions for ALP searches

MuCap: Muon Capture on the Proton

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