Measurement of the pion axial form factor from radiative decay

Bay, A.; Ruegger, D.; Gabioud, B.; Joseph, C.; Loude, J.-F.; Perroud, J. P.; Schöri, O.; Steiner, D.; Trân, M. T.; Elmbt, Larry van; Lebrun, Marcel; Martoff, C. J.; Truöl, P.

doi:10.1016/0370-2693(86)91034-8

Cited by 51 publications

(6 citation statements)

References 22 publications

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“…which represents a fourfold improvement in precision over the previous most accurate measurement [20]. However, the goodness of the fit was adversely affected by a sizable, 19 % shortfall in the measured branching ratio in region B, which dominates the total χ 2 .…”

Section: Radiative Decay π + → E + νγmentioning

confidence: 85%

Status of Pion Rare Decays

Počanić

2006

Nuclear Physics B - Proceedings Supplements

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Section: Radiative Decay π + → E + νγmentioning

confidence: 85%

Status of Pion Rare Decays

Počanić

2006

Nuclear Physics B - Proceedings Supplements

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“…The vector form factor F V is related to the decay rate of the π 0 → γγ decay [1,5] by the vector current conservation, so it was easier to find it using the lifetime of π 0 . On the other hand, it took many years to measure unambiguously the axial-vector form factors [6][7][8][9][10][11][12][13][14]. Some years ago, PIBETA Collaboration [15] conducted a precise measurement of the pion weak form factors, reporting the values of the vector and axial-vector form factors respectively as F V (0) = 0.0258 (17) and F A (0) = 0.0117 (17).…”

Section: Introductionmentioning

confidence: 99%

Pion radiative weak decay from the instanton vacuum

Shim

Kim

2017

Physics Letters B

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We investigate the vector and axial-vector form factors for the pion radiative weak decays $\pi^+\to e^+\nu_e \gamma$ and $\pi^+\to e^+\nu_e e^+ e^-$, based on the gauged effective chiral action from the instanton vacuum in the large $N_c$ limit. The nonlocal contributions, which arise from the gauging of the action, enhance the vector form factor by about $20\,\%$, whereas the axial-vector form factor is reduced by almost $30\,\%$. Both the results for the vector and axial-vector form factors at the zero momentum transfer are in good agreement with the experimental data. The dependence of the form factors on the momentum transfer is also studied. The slope parameters are computed and compared with other works.Comment: 13 pages, 7 figures. Final version accepted for publication in Phys.Lett.

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“…On the experimental side an investigation has been performed at PSI [12], where the form factors have been measured with errors of only a few percent. Older experimental data [13][14][15] serve as an additional check. Future experiments on the radiative kaon decay will be helpful as the ratio of the decay widths of the pion and the kaon mode can be predicted theoretically with higher precision than the decay widths individually.…”

Section: Introductionmentioning

confidence: 99%

On the radiative pion decay

Unterdorfer

Pichl

2008

Eur. Phys. J. C

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A reanalysis of the radiative pion decay together with the calculation of the radiative corrections within chiral perturbation theory (CHPT) is performed. The amplitude of this decay contains an inner Bremsstrahlung contribution and a structure-dependent part that are both accessible in experiments. In order to obtain a reliable estimate of the hadronic contributions we combine the CHPT result with a large-N C expansion and experimental data on other decays, which makes it possible to determine the occurring coupling constants.

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Measurement of the pion axial form factor from radiative decay

Cited by 51 publications

References 22 publications

Status of Pion Rare Decays

Status of Pion Rare Decays

Pion radiative weak decay from the instanton vacuum

On the radiative pion decay

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