Study of the Decay<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>π</mml:mi><mml:mo>→</mml:mo><mml:mi>e</mml:mi><mml:mo>+</mml:mo><mml:mi>ν</mml:mi></mml:math>

Capua, E. Di; Garland, R.; Pondrom, L.; Strelzoff, A.

doi:10.1103/physrev.133.b1333

Cited by 71 publications

(8 citation statements)

References 11 publications

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“…Subsequently, an experiment by Di Capua etal. 6 obtained 7 R = (1.274±0.024)x 10" 4 , which differs from the theoretical prediction by (3.3± 1.9)%. In this Letter, a new measurement of the branching ratio is reported.…”

Section: In An Early (Va)contrasting

confidence: 69%

New Measurement of theπ→eνBranching Ratio

Bryman¹,

Dubois²,

Numao³

et al. 1983

Phys. Rev. Lett.

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Section: In An Early (Va)contrasting

confidence: 69%

New Measurement of theπ→eνBranching Ratio

Bryman¹,

Dubois²,

Numao³

et al. 1983

Phys. Rev. Lett.

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“…Later the uncertainty was pushed down to about 2% by Di Capua et al [11]: R = (1.247 ± 0.028 )x 10 " 4 . This value has been updated to 1.273 x 10 ~4 using the latest value for the pion lifetime [12].…”

mentioning

confidence: 96%

Branching ratio for the rare pion decay into positron and neutrino

et al. 1993

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A new precision measurement of the branching ratio of the rare pion decay into a positron and a neutrino Or-* ev) has been completed. A beam of positive pions was stopped in an active target of plastic scintillator surrounded by a An BGO calorimeter. 3xl0 5 rare decays and 1.2xl0 6 normal pion decays (/r-*/xv) were recorded. The branching ratio was finally calculated from 1.2 xlO 5 rare decays after various cuts in the time window from 7.5 to 200 ns after pion stop. The errors of the result (1.235 ±0.005) x 10 " 4 are 0.28% statistical and 0.29% systematical.PACS numbers: 13.20.Cz An experiment was performed to measure the branching ratio R for the rare decay /r-> ev(y) (i.e., K-+ ev including K-* evy), normalized to the normal pion decay K-* jnv(y) with high precision, testing the fie universality of the weak interaction. This rare decay has been treated theoretically many times and values for R have been published by several authors during the development of the theory of the weak interaction [1-3] and also later inthe framework of gauge theories. The most recent predictions for R are as follows: Marciano and Sirlin [4], (1.233 ±0.004) x 10 " 4 ; Goldman and Wilson [5], (1.239 ± 0.001) x 10 " 4 ; Marciano [6], (1.2345 ± 0.0010) x 10 " 4 .

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“…It is a direct consequence of the V −A nature of the weak interaction, through helicity suppression of the right-handed state of the electron. Furthermore, the predicted radiative corrections for the π e2 decay [4,5] received quick experimental confirmation [6,7].…”

Section: Motivationmentioning

confidence: 88%

PEN: a low energy test of lepton universality

Počanić¹,

Alonzi²,

Баранов³

et al. 2017

Proceedings of XIII International Conference on Heavy Quarks and Leptons — PoS(HQL 2016)

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Allowed charged π meson decays are characterized by simple dynamics, few available decay channels, mainly into leptons, and extremely well controlled radiative and loop corrections. In that sense, pion decays represent a veritable triumph of the standard model (SM) of elementary particles and interactions. This relative theoretical simplicity makes charged pion decays a sensitive means for testing the underlying symmetries and the universality of weak fermion couplings, as well as for studying pion structure and chiral dynamics. Even after considerable recent improvements, experimental precision is lagging far behind that of the theoretical description for pion decays. We review the current state of experimental study of the pion electronic decay π + → e + ν e (γ), or π e2(γ) , where the (γ) indicates inclusion and explicit treatment of radiative decay events. We briefly review the limits on non-SM processes arising from the present level of experimental precision in π e2(γ) decays. Focusing on the PEN experiment at the Paul Scherrer Institute (PSI), Switzerland, we examine the prospects for further improvement in the near term.

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Study of the Decayπ→e+ν

Cited by 71 publications

References 11 publications

New Measurement of theπ→eνBranching Ratio

New Measurement of theπ→eνBranching Ratio

Branching ratio for the rare pion decay into positron and neutrino

PEN: a low energy test of lepton universality

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